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apache / hadoop / 27a3e233aa9c7991a4650c99cdc4d4113551601a / . / hadoop-common-project / hadoop-common / src / main / java / org / apache / hadoop / conf / Configuration.java
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/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.conf;
import java.io.BufferedInputStream;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.io.Writer;
import java.lang.ref.WeakReference;
import java.net.InetSocketAddress;
import java.net.URL;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.ListIterator;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Properties;
import java.util.Set;
import java.util.StringTokenizer;
import java.util.WeakHashMap;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;
import java.util.concurrent.TimeUnit;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.CommonConfigurationKeys;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.io.WritableUtils;
import org.apache.hadoop.net.NetUtils;
import org.apache.hadoop.util.ReflectionUtils;
import org.apache.hadoop.util.StringInterner;
import org.apache.hadoop.util.StringUtils;
import org.codehaus.jackson.JsonFactory;
import org.codehaus.jackson.JsonGenerator;
import org.w3c.dom.DOMException;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.Text;
import org.xml.sax.SAXException;
import com.google.common.base.Preconditions;
/**
* Provides access to configuration parameters.
*
* <h4 id="Resources">Resources</h4>
*
* <p>Configurations are specified by resources. A resource contains a set of
* name/value pairs as XML data. Each resource is named by either a
* <code>String</code> or by a {@link Path}. If named by a <code>String</code>,
* then the classpath is examined for a file with that name. If named by a
* <code>Path</code>, then the local filesystem is examined directly, without
* referring to the classpath.
*
* <p>Unless explicitly turned off, Hadoop by default specifies two
* resources, loaded in-order from the classpath: <ol>
* <li><tt><a href="{@docRoot}/../core-default.html">core-default.xml</a>
* </tt>: Read-only defaults for hadoop.</li>
* <li><tt>core-site.xml</tt>: Site-specific configuration for a given hadoop
* installation.</li>
* </ol>
* Applications may add additional resources, which are loaded
* subsequent to these resources in the order they are added.
*
* <h4 id="FinalParams">Final Parameters</h4>
*
* <p>Configuration parameters may be declared <i>final</i>.
* Once a resource declares a value final, no subsequently-loaded
* resource can alter that value.
* For example, one might define a final parameter with:
* <tt><pre>
* &lt;property&gt;
* &lt;name&gt;dfs.hosts.include&lt;/name&gt;
* &lt;value&gt;/etc/hadoop/conf/hosts.include&lt;/value&gt;
* <b>&lt;final&gt;true&lt;/final&gt;</b>
* &lt;/property&gt;</pre></tt>
*
* Administrators typically define parameters as final in
* <tt>core-site.xml</tt> for values that user applications may not alter.
*
* <h4 id="VariableExpansion">Variable Expansion</h4>
*
* <p>Value strings are first processed for <i>variable expansion</i>. The
* available properties are:<ol>
* <li>Other properties defined in this Configuration; and, if a name is
* undefined here,</li>
* <li>Properties in {@link System#getProperties()}.</li>
* </ol>
*
* <p>For example, if a configuration resource contains the following property
* definitions:
* <tt><pre>
* &lt;property&gt;
* &lt;name&gt;basedir&lt;/name&gt;
* &lt;value&gt;/user/${<i>user.name</i>}&lt;/value&gt;
* &lt;/property&gt;
*
* &lt;property&gt;
* &lt;name&gt;tempdir&lt;/name&gt;
* &lt;value&gt;${<i>basedir</i>}/tmp&lt;/value&gt;
* &lt;/property&gt;</pre></tt>
*
* When <tt>conf.get("tempdir")</tt> is called, then <tt>${<i>basedir</i>}</tt>
* will be resolved to another property in this Configuration, while
* <tt>${<i>user.name</i>}</tt> would then ordinarily be resolved to the value
* of the System property with that name.
*/
@InterfaceAudience.Public
@InterfaceStability.Stable
public class Configuration implements Iterable<Map.Entry<String,String>>,
Writable {
private static final Log LOG =
LogFactory.getLog(Configuration.class);
private boolean quietmode = true;
private static class Resource {
private final Object resource;
private final String name;
public Resource(Object resource) {
this(resource, resource.toString());
}
public Resource(Object resource, String name) {
this.resource = resource;
this.name = name;
}
public String getName(){
return name;
}
public Object getResource() {
return resource;
}
@Override
public String toString() {
return name;
}
}
/**
* List of configuration resources.
*/
private ArrayList<Resource> resources = new ArrayList<Resource>();
/**
* The value reported as the setting resource when a key is set
* by code rather than a file resource by dumpConfiguration.
*/
static final String UNKNOWN_RESOURCE = "Unknown";
/**
* List of configuration parameters marked <b>final</b>.
*/
private Set<String> finalParameters = new HashSet<String>();
private boolean loadDefaults = true;
/**
* Configuration objects
*/
private static final WeakHashMap<Configuration,Object> REGISTRY =
new WeakHashMap<Configuration,Object>();
/**
* List of default Resources. Resources are loaded in the order of the list
* entries
*/
private static final CopyOnWriteArrayList<String> defaultResources =
new CopyOnWriteArrayList<String>();
private static final Map<ClassLoader, Map<String, WeakReference<Class<?>>>>
CACHE_CLASSES = new WeakHashMap<ClassLoader, Map<String, WeakReference<Class<?>>>>();
/**
* Sentinel value to store negative cache results in {@link #CACHE_CLASSES}.
*/
private static final Class<?> NEGATIVE_CACHE_SENTINEL =
NegativeCacheSentinel.class;
/**
* Stores the mapping of key to the resource which modifies or loads
* the key most recently
*/
private HashMap<String, String[]> updatingResource;
/**
* Class to keep the information about the keys which replace the deprecated
* ones.
*
* This class stores the new keys which replace the deprecated keys and also
* gives a provision to have a custom message for each of the deprecated key
* that is being replaced. It also provides method to get the appropriate
* warning message which can be logged whenever the deprecated key is used.
*/
private static class DeprecatedKeyInfo {
private String[] newKeys;
private String customMessage;
private boolean accessed;
DeprecatedKeyInfo(String[] newKeys, String customMessage) {
this.newKeys = newKeys;
this.customMessage = customMessage;
accessed = false;
}
/**
* Method to provide the warning message. It gives the custom message if
* non-null, and default message otherwise.
* @param key the associated deprecated key.
* @return message that is to be logged when a deprecated key is used.
*/
private final String getWarningMessage(String key) {
String warningMessage;
if(customMessage == null) {
StringBuilder message = new StringBuilder(key);
String deprecatedKeySuffix = " is deprecated. Instead, use ";
message.append(deprecatedKeySuffix);
for (int i = 0; i < newKeys.length; i++) {
message.append(newKeys[i]);
if(i != newKeys.length-1) {
message.append(", ");
}
}
warningMessage = message.toString();
}
else {
warningMessage = customMessage;
}
accessed = true;
return warningMessage;
}
}
/**
* Stores the deprecated keys, the new keys which replace the deprecated keys
* and custom message(if any provided).
*/
private static Map<String, DeprecatedKeyInfo> deprecatedKeyMap =
new HashMap<String, DeprecatedKeyInfo>();
/**
* Stores a mapping from superseding keys to the keys which they deprecate.
*/
private static Map<String, String> reverseDeprecatedKeyMap =
new HashMap<String, String>();
/**
* Adds the deprecated key to the deprecation map.
* It does not override any existing entries in the deprecation map.
* This is to be used only by the developers in order to add deprecation of
* keys, and attempts to call this method after loading resources once,
* would lead to <tt>UnsupportedOperationException</tt>
*
* If a key is deprecated in favor of multiple keys, they are all treated as
* aliases of each other, and setting any one of them resets all the others
* to the new value.
*
* @param key
* @param newKeys
* @param customMessage
* @deprecated use {@link #addDeprecation(String key, String newKey,
String customMessage)} instead
*/
@Deprecated
public synchronized static void addDeprecation(String key, String[] newKeys,
String customMessage) {
if (key == null || key.length() == 0 ||
newKeys == null || newKeys.length == 0) {
throw new IllegalArgumentException();
}
if (!isDeprecated(key)) {
DeprecatedKeyInfo newKeyInfo;
newKeyInfo = new DeprecatedKeyInfo(newKeys, customMessage);
deprecatedKeyMap.put(key, newKeyInfo);
for (String newKey : newKeys) {
reverseDeprecatedKeyMap.put(newKey, key);
}
}
}
/**
* Adds the deprecated key to the deprecation map.
* It does not override any existing entries in the deprecation map.
* This is to be used only by the developers in order to add deprecation of
* keys, and attempts to call this method after loading resources once,
* would lead to <tt>UnsupportedOperationException</tt>
*
* @param key
* @param newKey
* @param customMessage
*/
public synchronized static void addDeprecation(String key, String newKey,
String customMessage) {
addDeprecation(key, new String[] {newKey}, customMessage);
}
/**
* Adds the deprecated key to the deprecation map when no custom message
* is provided.
* It does not override any existing entries in the deprecation map.
* This is to be used only by the developers in order to add deprecation of
* keys, and attempts to call this method after loading resources once,
* would lead to <tt>UnsupportedOperationException</tt>
*
* If a key is deprecated in favor of multiple keys, they are all treated as
* aliases of each other, and setting any one of them resets all the others
* to the new value.
*
* @param key Key that is to be deprecated
* @param newKeys list of keys that take up the values of deprecated key
* @deprecated use {@link #addDeprecation(String key, String newKey)} instead
*/
@Deprecated
public synchronized static void addDeprecation(String key, String[] newKeys) {
addDeprecation(key, newKeys, null);
}
/**
* Adds the deprecated key to the deprecation map when no custom message
* is provided.
* It does not override any existing entries in the deprecation map.
* This is to be used only by the developers in order to add deprecation of
* keys, and attempts to call this method after loading resources once,
* would lead to <tt>UnsupportedOperationException</tt>
*
* @param key Key that is to be deprecated
* @param newKey key that takes up the value of deprecated key
*/
public synchronized static void addDeprecation(String key, String newKey) {
addDeprecation(key, new String[] {newKey}, null);
}
/**
* checks whether the given <code>key</code> is deprecated.
*
* @param key the parameter which is to be checked for deprecation
* @return <code>true</code> if the key is deprecated and
* <code>false</code> otherwise.
*/
public static boolean isDeprecated(String key) {
return deprecatedKeyMap.containsKey(key);
}
/**
* Returns the alternate name for a key if the property name is deprecated
* or if deprecates a property name.
*
* @param name property name.
* @return alternate name.
*/
private String[] getAlternateNames(String name) {
String altNames[] = null;
DeprecatedKeyInfo keyInfo = deprecatedKeyMap.get(name);
if (keyInfo == null) {
altNames = (reverseDeprecatedKeyMap.get(name) != null ) ?
new String [] {reverseDeprecatedKeyMap.get(name)} : null;
if(altNames != null && altNames.length > 0) {
//To help look for other new configs for this deprecated config
keyInfo = deprecatedKeyMap.get(altNames[0]);
}
}
if(keyInfo != null && keyInfo.newKeys.length > 0) {
List<String> list = new ArrayList<String>();
if(altNames != null) {
list.addAll(Arrays.asList(altNames));
}
list.addAll(Arrays.asList(keyInfo.newKeys));
altNames = list.toArray(new String[list.size()]);
}
return altNames;
}
/**
* Checks for the presence of the property <code>name</code> in the
* deprecation map. Returns the first of the list of new keys if present
* in the deprecation map or the <code>name</code> itself. If the property
* is not presently set but the property map contains an entry for the
* deprecated key, the value of the deprecated key is set as the value for
* the provided property name.
*
* @param name the property name
* @return the first property in the list of properties mapping
* the <code>name</code> or the <code>name</code> itself.
*/
private String[] handleDeprecation(String name) {
ArrayList<String > names = new ArrayList<String>();
if (isDeprecated(name)) {
DeprecatedKeyInfo keyInfo = deprecatedKeyMap.get(name);
warnOnceIfDeprecated(name);
for (String newKey : keyInfo.newKeys) {
if(newKey != null) {
names.add(newKey);
}
}
}
if(names.size() == 0) {
names.add(name);
}
for(String n : names) {
String deprecatedKey = reverseDeprecatedKeyMap.get(n);
if (deprecatedKey != null && !getOverlay().containsKey(n) &&
getOverlay().containsKey(deprecatedKey)) {
getProps().setProperty(n, getOverlay().getProperty(deprecatedKey));
getOverlay().setProperty(n, getOverlay().getProperty(deprecatedKey));
}
}
return names.toArray(new String[names.size()]);
}
private void handleDeprecation() {
LOG.debug("Handling deprecation for all properties in config...");
Set<Object> keys = new HashSet<Object>();
keys.addAll(getProps().keySet());
for (Object item: keys) {
LOG.debug("Handling deprecation for " + (String)item);
handleDeprecation((String)item);
}
}
static{
//print deprecation warning if hadoop-site.xml is found in classpath
ClassLoader cL = Thread.currentThread().getContextClassLoader();
if (cL == null) {
cL = Configuration.class.getClassLoader();
}
if(cL.getResource("hadoop-site.xml")!=null) {
LOG.warn("DEPRECATED: hadoop-site.xml found in the classpath. " +
"Usage of hadoop-site.xml is deprecated. Instead use core-site.xml, "
+ "mapred-site.xml and hdfs-site.xml to override properties of " +
"core-default.xml, mapred-default.xml and hdfs-default.xml " +
"respectively");
}
addDefaultResource("core-default.xml");
addDefaultResource("core-site.xml");
//Add code for managing deprecated key mapping
//for example
//addDeprecation("oldKey1",new String[]{"newkey1","newkey2"});
//adds deprecation for oldKey1 to two new keys(newkey1, newkey2).
//so get or set of oldKey1 will correctly populate/access values of
//newkey1 and newkey2
addDeprecatedKeys();
}
private Properties properties;
private Properties overlay;
private ClassLoader classLoader;
{
classLoader = Thread.currentThread().getContextClassLoader();
if (classLoader == null) {
classLoader = Configuration.class.getClassLoader();
}
}
/** A new configuration. */
public Configuration() {
this(true);
}
/** A new configuration where the behavior of reading from the default
* resources can be turned off.
*
* If the parameter {@code loadDefaults} is false, the new instance
* will not load resources from the default files.
* @param loadDefaults specifies whether to load from the default files
*/
public Configuration(boolean loadDefaults) {
this.loadDefaults = loadDefaults;
updatingResource = new HashMap<String, String[]>();
synchronized(Configuration.class) {
REGISTRY.put(this, null);
}
}
/**
* A new configuration with the same settings cloned from another.
*
* @param other the configuration from which to clone settings.
*/
@SuppressWarnings("unchecked")
public Configuration(Configuration other) {
this.resources = (ArrayList<Resource>) other.resources.clone();
synchronized(other) {
if (other.properties != null) {
this.properties = (Properties)other.properties.clone();
}
if (other.overlay!=null) {
this.overlay = (Properties)other.overlay.clone();
}
this.updatingResource = new HashMap<String, String[]>(other.updatingResource);
}
this.finalParameters = new HashSet<String>(other.finalParameters);
synchronized(Configuration.class) {
REGISTRY.put(this, null);
}
this.classLoader = other.classLoader;
this.loadDefaults = other.loadDefaults;
setQuietMode(other.getQuietMode());
}
/**
* Add a default resource. Resources are loaded in the order of the resources
* added.
* @param name file name. File should be present in the classpath.
*/
public static synchronized void addDefaultResource(String name) {
if(!defaultResources.contains(name)) {
defaultResources.add(name);
for(Configuration conf : REGISTRY.keySet()) {
if(conf.loadDefaults) {
conf.reloadConfiguration();
}
}
}
}
/**
* Add a configuration resource.
*
* The properties of this resource will override properties of previously
* added resources, unless they were marked <a href="#Final">final</a>.
*
* @param name resource to be added, the classpath is examined for a file
* with that name.
*/
public void addResource(String name) {
addResourceObject(new Resource(name));
}
/**
* Add a configuration resource.
*
* The properties of this resource will override properties of previously
* added resources, unless they were marked <a href="#Final">final</a>.
*
* @param url url of the resource to be added, the local filesystem is
* examined directly to find the resource, without referring to
* the classpath.
*/
public void addResource(URL url) {
addResourceObject(new Resource(url));
}
/**
* Add a configuration resource.
*
* The properties of this resource will override properties of previously
* added resources, unless they were marked <a href="#Final">final</a>.
*
* @param file file-path of resource to be added, the local filesystem is
* examined directly to find the resource, without referring to
* the classpath.
*/
public void addResource(Path file) {
addResourceObject(new Resource(file));
}
/**
* Add a configuration resource.
*
* The properties of this resource will override properties of previously
* added resources, unless they were marked <a href="#Final">final</a>.
*
* WARNING: The contents of the InputStream will be cached, by this method.
* So use this sparingly because it does increase the memory consumption.
*
* @param in InputStream to deserialize the object from. In will be read from
* when a get or set is called next. After it is read the stream will be
* closed.
*/
public void addResource(InputStream in) {
addResourceObject(new Resource(in));
}
/**
* Add a configuration resource.
*
* The properties of this resource will override properties of previously
* added resources, unless they were marked <a href="#Final">final</a>.
*
* @param in InputStream to deserialize the object from.
* @param name the name of the resource because InputStream.toString is not
* very descriptive some times.
*/
public void addResource(InputStream in, String name) {
addResourceObject(new Resource(in, name));
}
/**
* Reload configuration from previously added resources.
*
* This method will clear all the configuration read from the added
* resources, and final parameters. This will make the resources to
* be read again before accessing the values. Values that are added
* via set methods will overlay values read from the resources.
*/
public synchronized void reloadConfiguration() {
properties = null; // trigger reload
finalParameters.clear(); // clear site-limits
}
private synchronized void addResourceObject(Resource resource) {
resources.add(resource); // add to resources
reloadConfiguration();
}
private static Pattern varPat = Pattern.compile("\\$\\{[^\\}\\$\u0020]+\\}");
private static int MAX_SUBST = 20;
private String substituteVars(String expr) {
if (expr == null) {
return null;
}
Matcher match = varPat.matcher("");
String eval = expr;
for(int s=0; s<MAX_SUBST; s++) {
match.reset(eval);
if (!match.find()) {
return eval;
}
String var = match.group();
var = var.substring(2, var.length()-1); // remove ${ .. }
String val = null;
try {
val = System.getProperty(var);
} catch(SecurityException se) {
LOG.warn("Unexpected SecurityException in Configuration", se);
}
if (val == null) {
val = getRaw(var);
}
if (val == null) {
return eval; // return literal ${var}: var is unbound
}
// substitute
eval = eval.substring(0, match.start())+val+eval.substring(match.end());
}
throw new IllegalStateException("Variable substitution depth too large: "
+ MAX_SUBST + " " + expr);
}
/**
* Get the value of the <code>name</code> property, <code>null</code> if
* no such property exists. If the key is deprecated, it returns the value of
* the first key which replaces the deprecated key and is not null
*
* Values are processed for <a href="#VariableExpansion">variable expansion</a>
* before being returned.
*
* @param name the property name.
* @return the value of the <code>name</code> or its replacing property,
* or null if no such property exists.
*/
public String get(String name) {
String[] names = handleDeprecation(name);
String result = null;
for(String n : names) {
result = substituteVars(getProps().getProperty(n));
}
return result;
}
/**
* Get the value of the <code>name</code> property as a trimmed <code>String</code>,
* <code>null</code> if no such property exists.
* If the key is deprecated, it returns the value of
* the first key which replaces the deprecated key and is not null
*
* Values are processed for <a href="#VariableExpansion">variable expansion</a>
* before being returned.
*
* @param name the property name.
* @return the value of the <code>name</code> or its replacing property,
* or null if no such property exists.
*/
public String getTrimmed(String name) {
String value = get(name);
if (null == value) {
return null;
} else {
return value.trim();
}
}
/**
* Get the value of the <code>name</code> property as a trimmed <code>String</code>,
* <code>defaultValue</code> if no such property exists.
* See @{Configuration#getTrimmed} for more details.
*
* @param name the property name.
* @param defaultValue the property default value.
* @return the value of the <code>name</code> or defaultValue
* if it is not set.
*/
public String getTrimmed(String name, String defaultValue) {
String ret = getTrimmed(name);
return ret == null ? defaultValue : ret;
}
/**
* Get the value of the <code>name</code> property, without doing
* <a href="#VariableExpansion">variable expansion</a>.If the key is
* deprecated, it returns the value of the first key which replaces
* the deprecated key and is not null.
*
* @param name the property name.
* @return the value of the <code>name</code> property or
* its replacing property and null if no such property exists.
*/
public String getRaw(String name) {
String[] names = handleDeprecation(name);
String result = null;
for(String n : names) {
result = getProps().getProperty(n);
}
return result;
}
/**
* Set the <code>value</code> of the <code>name</code> property. If
* <code>name</code> is deprecated or there is a deprecated name associated to it,
* it sets the value to both names.
*
* @param name property name.
* @param value property value.
*/
public void set(String name, String value) {
set(name, value, null);
}
/**
* Set the <code>value</code> of the <code>name</code> property. If
* <code>name</code> is deprecated or there is a deprecated name associated to it,
* it sets the value to both names.
*
* @param name property name.
* @param value property value.
* @param source the place that this configuration value came from
* (For debugging).
* @throws IllegalArgumentException when the value or name is null.
*/
public void set(String name, String value, String source) {
Preconditions.checkArgument(
name != null,
"Property name must not be null");
Preconditions.checkArgument(
value != null,
"Property value must not be null");
if (deprecatedKeyMap.isEmpty()) {
getProps();
}
getOverlay().setProperty(name, value);
getProps().setProperty(name, value);
if(source == null) {
updatingResource.put(name, new String[] {"programatically"});
} else {
updatingResource.put(name, new String[] {source});
}
String[] altNames = getAlternateNames(name);
if (altNames != null && altNames.length > 0) {
String altSource = "because " + name + " is deprecated";
for(String altName : altNames) {
if(!altName.equals(name)) {
getOverlay().setProperty(altName, value);
getProps().setProperty(altName, value);
updatingResource.put(altName, new String[] {altSource});
}
}
}
warnOnceIfDeprecated(name);
}
private void warnOnceIfDeprecated(String name) {
DeprecatedKeyInfo keyInfo = deprecatedKeyMap.get(name);
if (keyInfo != null && !keyInfo.accessed) {
LOG.warn(keyInfo.getWarningMessage(name));
}
}
/**
* Unset a previously set property.
*/
public synchronized void unset(String name) {
String[] altNames = getAlternateNames(name);
getOverlay().remove(name);
getProps().remove(name);
if (altNames !=null && altNames.length > 0) {
for(String altName : altNames) {
getOverlay().remove(altName);
getProps().remove(altName);
}
}
}
/**
* Sets a property if it is currently unset.
* @param name the property name
* @param value the new value
*/
public synchronized void setIfUnset(String name, String value) {
if (get(name) == null) {
set(name, value);
}
}
private synchronized Properties getOverlay() {
if (overlay==null){
overlay=new Properties();
}
return overlay;
}
/**
* Get the value of the <code>name</code>. If the key is deprecated,
* it returns the value of the first key which replaces the deprecated key
* and is not null.
* If no such property exists,
* then <code>defaultValue</code> is returned.
*
* @param name property name.
* @param defaultValue default value.
* @return property value, or <code>defaultValue</code> if the property
* doesn't exist.
*/
public String get(String name, String defaultValue) {
String[] names = handleDeprecation(name);
String result = null;
for(String n : names) {
result = substituteVars(getProps().getProperty(n, defaultValue));
}
return result;
}
/**
* Get the value of the <code>name</code> property as an <code>int</code>.
*
* If no such property exists, the provided default value is returned,
* or if the specified value is not a valid <code>int</code>,
* then an error is thrown.
*
* @param name property name.
* @param defaultValue default value.
* @throws NumberFormatException when the value is invalid
* @return property value as an <code>int</code>,
* or <code>defaultValue</code>.
*/
public int getInt(String name, int defaultValue) {
String valueString = getTrimmed(name);
if (valueString == null)
return defaultValue;
String hexString = getHexDigits(valueString);
if (hexString != null) {
return Integer.parseInt(hexString, 16);
}
return Integer.parseInt(valueString);
}
/**
* Get the value of the <code>name</code> property as a set of comma-delimited
* <code>int</code> values.
*
* If no such property exists, an empty array is returned.
*
* @param name property name
* @return property value interpreted as an array of comma-delimited
* <code>int</code> values
*/
public int[] getInts(String name) {
String[] strings = getTrimmedStrings(name);
int[] ints = new int[strings.length];
for (int i = 0; i < strings.length; i++) {
ints[i] = Integer.parseInt(strings[i]);
}
return ints;
}
/**
* Set the value of the <code>name</code> property to an <code>int</code>.
*
* @param name property name.
* @param value <code>int</code> value of the property.
*/
public void setInt(String name, int value) {
set(name, Integer.toString(value));
}
/**
* Get the value of the <code>name</code> property as a <code>long</code>.
* If no such property exists, the provided default value is returned,
* or if the specified value is not a valid <code>long</code>,
* then an error is thrown.
*
* @param name property name.
* @param defaultValue default value.
* @throws NumberFormatException when the value is invalid
* @return property value as a <code>long</code>,
* or <code>defaultValue</code>.
*/
public long getLong(String name, long defaultValue) {
String valueString = getTrimmed(name);
if (valueString == null)
return defaultValue;
String hexString = getHexDigits(valueString);
if (hexString != null) {
return Long.parseLong(hexString, 16);
}
return Long.parseLong(valueString);
}
/**
* Get the value of the <code>name</code> property as a <code>long</code> or
* human readable format. If no such property exists, the provided default
* value is returned, or if the specified value is not a valid
* <code>long</code> or human readable format, then an error is thrown. You
* can use the following suffix (case insensitive): k(kilo), m(mega), g(giga),
* t(tera), p(peta), e(exa)
*
* @param name property name.
* @param defaultValue default value.
* @throws NumberFormatException when the value is invalid
* @return property value as a <code>long</code>,
* or <code>defaultValue</code>.
*/
public long getLongBytes(String name, long defaultValue) {
String valueString = getTrimmed(name);
if (valueString == null)
return defaultValue;
return StringUtils.TraditionalBinaryPrefix.string2long(valueString);
}
private String getHexDigits(String value) {
boolean negative = false;
String str = value;
String hexString = null;
if (value.startsWith("-")) {
negative = true;
str = value.substring(1);
}
if (str.startsWith("0x") || str.startsWith("0X")) {
hexString = str.substring(2);
if (negative) {
hexString = "-" + hexString;
}
return hexString;
}
return null;
}
/**
* Set the value of the <code>name</code> property to a <code>long</code>.
*
* @param name property name.
* @param value <code>long</code> value of the property.
*/
public void setLong(String name, long value) {
set(name, Long.toString(value));
}
/**
* Get the value of the <code>name</code> property as a <code>float</code>.
* If no such property exists, the provided default value is returned,
* or if the specified value is not a valid <code>float</code>,
* then an error is thrown.
*
* @param name property name.
* @param defaultValue default value.
* @throws NumberFormatException when the value is invalid
* @return property value as a <code>float</code>,
* or <code>defaultValue</code>.
*/
public float getFloat(String name, float defaultValue) {
String valueString = getTrimmed(name);
if (valueString == null)
return defaultValue;
return Float.parseFloat(valueString);
}
/**
* Set the value of the <code>name</code> property to a <code>float</code>.
*
* @param name property name.
* @param value property value.
*/
public void setFloat(String name, float value) {
set(name,Float.toString(value));
}
/**
* Get the value of the <code>name</code> property as a <code>double</code>.
* If no such property exists, the provided default value is returned,
* or if the specified value is not a valid <code>double</code>,
* then an error is thrown.
*
* @param name property name.
* @param defaultValue default value.
* @throws NumberFormatException when the value is invalid
* @return property value as a <code>double</code>,
* or <code>defaultValue</code>.
*/
public double getDouble(String name, double defaultValue) {
String valueString = getTrimmed(name);
if (valueString == null)
return defaultValue;
return Double.parseDouble(valueString);
}
/**
* Set the value of the <code>name</code> property to a <code>double</code>.
*
* @param name property name.
* @param value property value.
*/
public void setDouble(String name, double value) {
set(name,Double.toString(value));
}
/**
* Get the value of the <code>name</code> property as a <code>boolean</code>.
* If no such property is specified, or if the specified value is not a valid
* <code>boolean</code>, then <code>defaultValue</code> is returned.
*
* @param name property name.
* @param defaultValue default value.
* @return property value as a <code>boolean</code>,
* or <code>defaultValue</code>.
*/
public boolean getBoolean(String name, boolean defaultValue) {
String valueString = getTrimmed(name);
if (null == valueString || "".equals(valueString)) {
return defaultValue;
}
valueString = valueString.toLowerCase();
if ("true".equals(valueString))
return true;
else if ("false".equals(valueString))
return false;
else return defaultValue;
}
/**
* Set the value of the <code>name</code> property to a <code>boolean</code>.
*
* @param name property name.
* @param value <code>boolean</code> value of the property.
*/
public void setBoolean(String name, boolean value) {
set(name, Boolean.toString(value));
}
/**
* Set the given property, if it is currently unset.
* @param name property name
* @param value new value
*/
public void setBooleanIfUnset(String name, boolean value) {
setIfUnset(name, Boolean.toString(value));
}
/**
* Set the value of the <code>name</code> property to the given type. This
* is equivalent to <code>set(&lt;name&gt;, value.toString())</code>.
* @param name property name
* @param value new value
*/
public <T extends Enum<T>> void setEnum(String name, T value) {
set(name, value.toString());
}
/**
* Return value matching this enumerated type.
* @param name Property name
* @param defaultValue Value returned if no mapping exists
* @throws IllegalArgumentException If mapping is illegal for the type
* provided
*/
public <T extends Enum<T>> T getEnum(String name, T defaultValue) {
final String val = get(name);
return null == val
? defaultValue
: Enum.valueOf(defaultValue.getDeclaringClass(), val);
}
enum ParsedTimeDuration {
NS {
TimeUnit unit() { return TimeUnit.NANOSECONDS; }
String suffix() { return "ns"; }
},
US {
TimeUnit unit() { return TimeUnit.MICROSECONDS; }
String suffix() { return "us"; }
},
MS {
TimeUnit unit() { return TimeUnit.MILLISECONDS; }
String suffix() { return "ms"; }
},
S {
TimeUnit unit() { return TimeUnit.SECONDS; }
String suffix() { return "s"; }
},
M {
TimeUnit unit() { return TimeUnit.MINUTES; }
String suffix() { return "m"; }
},
H {
TimeUnit unit() { return TimeUnit.HOURS; }
String suffix() { return "h"; }
},
D {
TimeUnit unit() { return TimeUnit.DAYS; }
String suffix() { return "d"; }
};
abstract TimeUnit unit();
abstract String suffix();
static ParsedTimeDuration unitFor(String s) {
for (ParsedTimeDuration ptd : values()) {
// iteration order is in decl order, so SECONDS matched last
if (s.endsWith(ptd.suffix())) {
return ptd;
}
}
return null;
}
static ParsedTimeDuration unitFor(TimeUnit unit) {
for (ParsedTimeDuration ptd : values()) {
if (ptd.unit() == unit) {
return ptd;
}
}
return null;
}
}
/**
* Set the value of <code>name</code> to the given time duration. This
* is equivalent to <code>set(&lt;name&gt;, value + &lt;time suffix&gt;)</code>.
* @param name Property name
* @param value Time duration
* @param unit Unit of time
*/
public void setTimeDuration(String name, long value, TimeUnit unit) {
set(name, value + ParsedTimeDuration.unitFor(unit).suffix());
}
/**
* Return time duration in the given time unit. Valid units are encoded in
* properties as suffixes: nanoseconds (ns), microseconds (us), milliseconds
* (ms), seconds (s), minutes (m), hours (h), and days (d).
* @param name Property name
* @param defaultValue Value returned if no mapping exists.
* @param unit Unit to convert the stored property, if it exists.
* @throws NumberFormatException If the property stripped of its unit is not
* a number
*/
public long getTimeDuration(String name, long defaultValue, TimeUnit unit) {
String vStr = get(name);
if (null == vStr) {
return defaultValue;
}
vStr = vStr.trim();
ParsedTimeDuration vUnit = ParsedTimeDuration.unitFor(vStr);
if (null == vUnit) {
LOG.warn("No unit for " + name + "(" + vStr + ") assuming " + unit);
vUnit = ParsedTimeDuration.unitFor(unit);
} else {
vStr = vStr.substring(0, vStr.lastIndexOf(vUnit.suffix()));
}
return unit.convert(Long.parseLong(vStr), vUnit.unit());
}
/**
* Get the value of the <code>name</code> property as a <code>Pattern</code>.
* If no such property is specified, or if the specified value is not a valid
* <code>Pattern</code>, then <code>DefaultValue</code> is returned.
*
* @param name property name
* @param defaultValue default value
* @return property value as a compiled Pattern, or defaultValue
*/
public Pattern getPattern(String name, Pattern defaultValue) {
String valString = get(name);
if (null == valString || "".equals(valString)) {
return defaultValue;
}
try {
return Pattern.compile(valString);
} catch (PatternSyntaxException pse) {
LOG.warn("Regular expression '" + valString + "' for property '" +
name + "' not valid. Using default", pse);
return defaultValue;
}
}
/**
* Set the given property to <code>Pattern</code>.
* If the pattern is passed as null, sets the empty pattern which results in
* further calls to getPattern(...) returning the default value.
*
* @param name property name
* @param pattern new value
*/
public void setPattern(String name, Pattern pattern) {
if (null == pattern) {
set(name, null);
} else {
set(name, pattern.pattern());
}
}
/**
* Gets information about why a property was set. Typically this is the
* path to the resource objects (file, URL, etc.) the property came from, but
* it can also indicate that it was set programatically, or because of the
* command line.
*
* @param name - The property name to get the source of.
* @return null - If the property or its source wasn't found. Otherwise,
* returns a list of the sources of the resource. The older sources are
* the first ones in the list. So for example if a configuration is set from
* the command line, and then written out to a file that is read back in the
* first entry would indicate that it was set from the command line, while
* the second one would indicate the file that the new configuration was read
* in from.
*/
@InterfaceStability.Unstable
public synchronized String[] getPropertySources(String name) {
if (properties == null) {
// If properties is null, it means a resource was newly added
// but the props were cleared so as to load it upon future
// requests. So lets force a load by asking a properties list.
getProps();
}
// Return a null right away if our properties still
// haven't loaded or the resource mapping isn't defined
if (properties == null || updatingResource == null) {
return null;
} else {
String[] source = updatingResource.get(name);
if(source == null) {
return null;
} else {
return Arrays.copyOf(source, source.length);
}
}
}
/**
* A class that represents a set of positive integer ranges. It parses
* strings of the form: "2-3,5,7-" where ranges are separated by comma and
* the lower/upper bounds are separated by dash. Either the lower or upper
* bound may be omitted meaning all values up to or over. So the string
* above means 2, 3, 5, and 7, 8, 9, ...
*/
public static class IntegerRanges implements Iterable<Integer>{
private static class Range {
int start;
int end;
}
private static class RangeNumberIterator implements Iterator<Integer> {
Iterator<Range> internal;
int at;
int end;
public RangeNumberIterator(List<Range> ranges) {
if (ranges != null) {
internal = ranges.iterator();
}
at = -1;
end = -2;
}
@Override
public boolean hasNext() {
if (at <= end) {
return true;
} else if (internal != null){
return internal.hasNext();
}
return false;
}
@Override
public Integer next() {
if (at <= end) {
at++;
return at - 1;
} else if (internal != null){
Range found = internal.next();
if (found != null) {
at = found.start;
end = found.end;
at++;
return at - 1;
}
}
return null;
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
};
List<Range> ranges = new ArrayList<Range>();
public IntegerRanges() {
}
public IntegerRanges(String newValue) {
StringTokenizer itr = new StringTokenizer(newValue, ",");
while (itr.hasMoreTokens()) {
String rng = itr.nextToken().trim();
String[] parts = rng.split("-", 3);
if (parts.length < 1 || parts.length > 2) {
throw new IllegalArgumentException("integer range badly formed: " +
rng);
}
Range r = new Range();
r.start = convertToInt(parts[0], 0);
if (parts.length == 2) {
r.end = convertToInt(parts[1], Integer.MAX_VALUE);
} else {
r.end = r.start;
}
if (r.start > r.end) {
throw new IllegalArgumentException("IntegerRange from " + r.start +
" to " + r.end + " is invalid");
}
ranges.add(r);
}
}
/**
* Convert a string to an int treating empty strings as the default value.
* @param value the string value
* @param defaultValue the value for if the string is empty
* @return the desired integer
*/
private static int convertToInt(String value, int defaultValue) {
String trim = value.trim();
if (trim.length() == 0) {
return defaultValue;
}
return Integer.parseInt(trim);
}
/**
* Is the given value in the set of ranges
* @param value the value to check
* @return is the value in the ranges?
*/
public boolean isIncluded(int value) {
for(Range r: ranges) {
if (r.start <= value && value <= r.end) {
return true;
}
}
return false;
}
/**
* @return true if there are no values in this range, else false.
*/
public boolean isEmpty() {
return ranges == null || ranges.isEmpty();
}
@Override
public String toString() {
StringBuilder result = new StringBuilder();
boolean first = true;
for(Range r: ranges) {
if (first) {
first = false;
} else {
result.append(',');
}
result.append(r.start);
result.append('-');
result.append(r.end);
}
return result.toString();
}
@Override
public Iterator<Integer> iterator() {
return new RangeNumberIterator(ranges);
}
}
/**
* Parse the given attribute as a set of integer ranges
* @param name the attribute name
* @param defaultValue the default value if it is not set
* @return a new set of ranges from the configured value
*/
public IntegerRanges getRange(String name, String defaultValue) {
return new IntegerRanges(get(name, defaultValue));
}
/**
* Get the comma delimited values of the <code>name</code> property as
* a collection of <code>String</code>s.
* If no such property is specified then empty collection is returned.
* <p>
* This is an optimized version of {@link #getStrings(String)}
*
* @param name property name.
* @return property value as a collection of <code>String</code>s.
*/
public Collection<String> getStringCollection(String name) {
String valueString = get(name);
return StringUtils.getStringCollection(valueString);
}
/**
* Get the comma delimited values of the <code>name</code> property as
* an array of <code>String</code>s.
* If no such property is specified then <code>null</code> is returned.
*
* @param name property name.
* @return property value as an array of <code>String</code>s,
* or <code>null</code>.
*/
public String[] getStrings(String name) {
String valueString = get(name);
return StringUtils.getStrings(valueString);
}
/**
* Get the comma delimited values of the <code>name</code> property as
* an array of <code>String</code>s.
* If no such property is specified then default value is returned.
*
* @param name property name.
* @param defaultValue The default value
* @return property value as an array of <code>String</code>s,
* or default value.
*/
public String[] getStrings(String name, String... defaultValue) {
String valueString = get(name);
if (valueString == null) {
return defaultValue;
} else {
return StringUtils.getStrings(valueString);
}
}
/**
* Get the comma delimited values of the <code>name</code> property as
* a collection of <code>String</code>s, trimmed of the leading and trailing whitespace.
* If no such property is specified then empty <code>Collection</code> is returned.
*
* @param name property name.
* @return property value as a collection of <code>String</code>s, or empty <code>Collection</code>
*/
public Collection<String> getTrimmedStringCollection(String name) {
String valueString = get(name);
if (null == valueString) {
Collection<String> empty = new ArrayList<String>();
return empty;
}
return StringUtils.getTrimmedStringCollection(valueString);
}
/**
* Get the comma delimited values of the <code>name</code> property as
* an array of <code>String</code>s, trimmed of the leading and trailing whitespace.
* If no such property is specified then an empty array is returned.
*
* @param name property name.
* @return property value as an array of trimmed <code>String</code>s,
* or empty array.
*/
public String[] getTrimmedStrings(String name) {
String valueString = get(name);
return StringUtils.getTrimmedStrings(valueString);
}
/**
* Get the comma delimited values of the <code>name</code> property as
* an array of <code>String</code>s, trimmed of the leading and trailing whitespace.
* If no such property is specified then default value is returned.
*
* @param name property name.
* @param defaultValue The default value
* @return property value as an array of trimmed <code>String</code>s,
* or default value.
*/
public String[] getTrimmedStrings(String name, String... defaultValue) {
String valueString = get(name);
if (null == valueString) {
return defaultValue;
} else {
return StringUtils.getTrimmedStrings(valueString);
}
}
/**
* Set the array of string values for the <code>name</code> property as
* as comma delimited values.
*
* @param name property name.
* @param values The values
*/
public void setStrings(String name, String... values) {
set(name, StringUtils.arrayToString(values));
}
/**
* Get the socket address for <code>name</code> property as a
* <code>InetSocketAddress</code>.
* @param name property name.
* @param defaultAddress the default value
* @param defaultPort the default port
* @return InetSocketAddress
*/
public InetSocketAddress getSocketAddr(
String name, String defaultAddress, int defaultPort) {
final String address = get(name, defaultAddress);
return NetUtils.createSocketAddr(address, defaultPort, name);
}
/**
* Set the socket address for the <code>name</code> property as
* a <code>host:port</code>.
*/
public void setSocketAddr(String name, InetSocketAddress addr) {
set(name, NetUtils.getHostPortString(addr));
}
/**
* Set the socket address a client can use to connect for the
* <code>name</code> property as a <code>host:port</code>. The wildcard
* address is replaced with the local host's address.
* @param name property name.
* @param addr InetSocketAddress of a listener to store in the given property
* @return InetSocketAddress for clients to connect
*/
public InetSocketAddress updateConnectAddr(String name,
InetSocketAddress addr) {
final InetSocketAddress connectAddr = NetUtils.getConnectAddress(addr);
setSocketAddr(name, connectAddr);
return connectAddr;
}
/**
* Load a class by name.
*
* @param name the class name.
* @return the class object.
* @throws ClassNotFoundException if the class is not found.
*/
public Class<?> getClassByName(String name) throws ClassNotFoundException {
Class<?> ret = getClassByNameOrNull(name);
if (ret == null) {
throw new ClassNotFoundException("Class " + name + " not found");
}
return ret;
}
/**
* Load a class by name, returning null rather than throwing an exception
* if it couldn't be loaded. This is to avoid the overhead of creating
* an exception.
*
* @param name the class name
* @return the class object, or null if it could not be found.
*/
public Class<?> getClassByNameOrNull(String name) {
Map<String, WeakReference<Class<?>>> map;
synchronized (CACHE_CLASSES) {
map = CACHE_CLASSES.get(classLoader);
if (map == null) {
map = Collections.synchronizedMap(
new WeakHashMap<String, WeakReference<Class<?>>>());
CACHE_CLASSES.put(classLoader, map);
}
}
Class<?> clazz = null;
WeakReference<Class<?>> ref = map.get(name);
if (ref != null) {
clazz = ref.get();
}
if (clazz == null) {
try {
clazz = Class.forName(name, true, classLoader);
} catch (ClassNotFoundException e) {
// Leave a marker that the class isn't found
map.put(name, new WeakReference<Class<?>>(NEGATIVE_CACHE_SENTINEL));
return null;
}
// two putters can race here, but they'll put the same class
map.put(name, new WeakReference<Class<?>>(clazz));
return clazz;
} else if (clazz == NEGATIVE_CACHE_SENTINEL) {
return null; // not found
} else {
// cache hit
return clazz;
}
}
/**
* Get the value of the <code>name</code> property
* as an array of <code>Class</code>.
* The value of the property specifies a list of comma separated class names.
* If no such property is specified, then <code>defaultValue</code> is
* returned.
*
* @param name the property name.
* @param defaultValue default value.
* @return property value as a <code>Class[]</code>,
* or <code>defaultValue</code>.
*/
public Class<?>[] getClasses(String name, Class<?> ... defaultValue) {
String[] classnames = getTrimmedStrings(name);
if (classnames == null)
return defaultValue;
try {
Class<?>[] classes = new Class<?>[classnames.length];
for(int i = 0; i < classnames.length; i++) {
classes[i] = getClassByName(classnames[i]);
}
return classes;
} catch (ClassNotFoundException e) {
throw new RuntimeException(e);
}
}
/**
* Get the value of the <code>name</code> property as a <code>Class</code>.
* If no such property is specified, then <code>defaultValue</code> is
* returned.
*
* @param name the class name.
* @param defaultValue default value.
* @return property value as a <code>Class</code>,
* or <code>defaultValue</code>.
*/
public Class<?> getClass(String name, Class<?> defaultValue) {
String valueString = getTrimmed(name);
if (valueString == null)
return defaultValue;
try {
return getClassByName(valueString);
} catch (ClassNotFoundException e) {
throw new RuntimeException(e);
}
}
/**
* Get the value of the <code>name</code> property as a <code>Class</code>
* implementing the interface specified by <code>xface</code>.
*
* If no such property is specified, then <code>defaultValue</code> is
* returned.
*
* An exception is thrown if the returned class does not implement the named
* interface.
*
* @param name the class name.
* @param defaultValue default value.
* @param xface the interface implemented by the named class.
* @return property value as a <code>Class</code>,
* or <code>defaultValue</code>.
*/
public <U> Class<? extends U> getClass(String name,
Class<? extends U> defaultValue,
Class<U> xface) {
try {
Class<?> theClass = getClass(name, defaultValue);
if (theClass != null && !xface.isAssignableFrom(theClass))
throw new RuntimeException(theClass+" not "+xface.getName());
else if (theClass != null)
return theClass.asSubclass(xface);
else
return null;
} catch (Exception e) {
throw new RuntimeException(e);
}
}
/**
* Get the value of the <code>name</code> property as a <code>List</code>
* of objects implementing the interface specified by <code>xface</code>.
*
* An exception is thrown if any of the classes does not exist, or if it does
* not implement the named interface.
*
* @param name the property name.
* @param xface the interface implemented by the classes named by
* <code>name</code>.
* @return a <code>List</code> of objects implementing <code>xface</code>.
*/
@SuppressWarnings("unchecked")
public <U> List<U> getInstances(String name, Class<U> xface) {
List<U> ret = new ArrayList<U>();
Class<?>[] classes = getClasses(name);
for (Class<?> cl: classes) {
if (!xface.isAssignableFrom(cl)) {
throw new RuntimeException(cl + " does not implement " + xface);
}
ret.add((U)ReflectionUtils.newInstance(cl, this));
}
return ret;
}
/**
* Set the value of the <code>name</code> property to the name of a
* <code>theClass</code> implementing the given interface <code>xface</code>.
*
* An exception is thrown if <code>theClass</code> does not implement the
* interface <code>xface</code>.
*
* @param name property name.
* @param theClass property value.
* @param xface the interface implemented by the named class.
*/
public void setClass(String name, Class<?> theClass, Class<?> xface) {
if (!xface.isAssignableFrom(theClass))
throw new RuntimeException(theClass+" not "+xface.getName());
set(name, theClass.getName());
}
/**
* Get a local file under a directory named by <i>dirsProp</i> with
* the given <i>path</i>. If <i>dirsProp</i> contains multiple directories,
* then one is chosen based on <i>path</i>'s hash code. If the selected
* directory does not exist, an attempt is made to create it.
*
* @param dirsProp directory in which to locate the file.
* @param path file-path.
* @return local file under the directory with the given path.
*/
public Path getLocalPath(String dirsProp, String path)
throws IOException {
String[] dirs = getTrimmedStrings(dirsProp);
int hashCode = path.hashCode();
FileSystem fs = FileSystem.getLocal(this);
for (int i = 0; i < dirs.length; i++) { // try each local dir
int index = (hashCode+i & Integer.MAX_VALUE) % dirs.length;
Path file = new Path(dirs[index], path);
Path dir = file.getParent();
if (fs.mkdirs(dir) || fs.exists(dir)) {
return file;
}
}
LOG.warn("Could not make " + path +
" in local directories from " + dirsProp);
for(int i=0; i < dirs.length; i++) {
int index = (hashCode+i & Integer.MAX_VALUE) % dirs.length;
LOG.warn(dirsProp + "[" + index + "]=" + dirs[index]);
}
throw new IOException("No valid local directories in property: "+dirsProp);
}
/**
* Get a local file name under a directory named in <i>dirsProp</i> with
* the given <i>path</i>. If <i>dirsProp</i> contains multiple directories,
* then one is chosen based on <i>path</i>'s hash code. If the selected
* directory does not exist, an attempt is made to create it.
*
* @param dirsProp directory in which to locate the file.
* @param path file-path.
* @return local file under the directory with the given path.
*/
public File getFile(String dirsProp, String path)
throws IOException {
String[] dirs = getTrimmedStrings(dirsProp);
int hashCode = path.hashCode();
for (int i = 0; i < dirs.length; i++) { // try each local dir
int index = (hashCode+i & Integer.MAX_VALUE) % dirs.length;
File file = new File(dirs[index], path);
File dir = file.getParentFile();
if (dir.exists() || dir.mkdirs()) {
return file;
}
}
throw new IOException("No valid local directories in property: "+dirsProp);
}
/**
* Get the {@link URL} for the named resource.
*
* @param name resource name.
* @return the url for the named resource.
*/
public URL getResource(String name) {
return classLoader.getResource(name);
}
/**
* Get an input stream attached to the configuration resource with the
* given <code>name</code>.
*
* @param name configuration resource name.
* @return an input stream attached to the resource.
*/
public InputStream getConfResourceAsInputStream(String name) {
try {
URL url= getResource(name);
if (url == null) {
LOG.info(name + " not found");
return null;
} else {
LOG.info("found resource " + name + " at " + url);
}
return url.openStream();
} catch (Exception e) {
return null;
}
}
/**
* Get a {@link Reader} attached to the configuration resource with the
* given <code>name</code>.
*
* @param name configuration resource name.
* @return a reader attached to the resource.
*/
public Reader getConfResourceAsReader(String name) {
try {
URL url= getResource(name);
if (url == null) {
LOG.info(name + " not found");
return null;
} else {
LOG.info("found resource " + name + " at " + url);
}
return new InputStreamReader(url.openStream());
} catch (Exception e) {
return null;
}
}
/**
* Get the set of parameters marked final.
*
* @return final parameter set.
*/
public Set<String> getFinalParameters() {
return new HashSet<String>(finalParameters);
}
protected synchronized Properties getProps() {
if (properties == null) {
properties = new Properties();
HashMap<String, String[]> backup =
new HashMap<String, String[]>(updatingResource);
loadResources(properties, resources, quietmode);
if (overlay!= null) {
properties.putAll(overlay);
for (Map.Entry<Object,Object> item: overlay.entrySet()) {
String key = (String)item.getKey();
updatingResource.put(key, backup.get(key));
}
}
}
return properties;
}
/**
* Return the number of keys in the configuration.
*
* @return number of keys in the configuration.
*/
public int size() {
return getProps().size();
}
/**
* Clears all keys from the configuration.
*/
public void clear() {
getProps().clear();
getOverlay().clear();
}
/**
* Get an {@link Iterator} to go through the list of <code>String</code>
* key-value pairs in the configuration.
*
* @return an iterator over the entries.
*/
@Override
public Iterator<Map.Entry<String, String>> iterator() {
// Get a copy of just the string to string pairs. After the old object
// methods that allow non-strings to be put into configurations are removed,
// we could replace properties with a Map<String,String> and get rid of this
// code.
Map<String,String> result = new HashMap<String,String>();
for(Map.Entry<Object,Object> item: getProps().entrySet()) {
if (item.getKey() instanceof String &&
item.getValue() instanceof String) {
result.put((String) item.getKey(), (String) item.getValue());
}
}
return result.entrySet().iterator();
}
private Document parse(DocumentBuilder builder, URL url)
throws IOException, SAXException {
if (!quietmode) {
LOG.info("parsing URL " + url);
}
if (url == null) {
return null;
}
return parse(builder, url.openStream(), url.toString());
}
private Document parse(DocumentBuilder builder, InputStream is,
String systemId) throws IOException, SAXException {
if (!quietmode) {
LOG.info("parsing input stream " + is);
}
if (is == null) {
return null;
}
try {
return (systemId == null) ? builder.parse(is) : builder.parse(is,
systemId);
} finally {
is.close();
}
}
private void loadResources(Properties properties,
ArrayList<Resource> resources,
boolean quiet) {
if(loadDefaults) {
for (String resource : defaultResources) {
loadResource(properties, new Resource(resource), quiet);
}
//support the hadoop-site.xml as a deprecated case
if(getResource("hadoop-site.xml")!=null) {
loadResource(properties, new Resource("hadoop-site.xml"), quiet);
}
}
for (int i = 0; i < resources.size(); i++) {
Resource ret = loadResource(properties, resources.get(i), quiet);
if (ret != null) {
resources.set(i, ret);
}
}
}
private Resource loadResource(Properties properties, Resource wrapper, boolean quiet) {
String name = UNKNOWN_RESOURCE;
try {
Object resource = wrapper.getResource();
name = wrapper.getName();
DocumentBuilderFactory docBuilderFactory
= DocumentBuilderFactory.newInstance();
//ignore all comments inside the xml file
docBuilderFactory.setIgnoringComments(true);
//allow includes in the xml file
docBuilderFactory.setNamespaceAware(true);
try {
docBuilderFactory.setXIncludeAware(true);
} catch (UnsupportedOperationException e) {
LOG.error("Failed to set setXIncludeAware(true) for parser "
+ docBuilderFactory
+ ":" + e,
e);
}
DocumentBuilder builder = docBuilderFactory.newDocumentBuilder();
Document doc = null;
Element root = null;
boolean returnCachedProperties = false;
if (resource instanceof URL) { // an URL resource
doc = parse(builder, (URL)resource);
} else if (resource instanceof String) { // a CLASSPATH resource
URL url = getResource((String)resource);
doc = parse(builder, url);
} else if (resource instanceof Path) { // a file resource
// Can't use FileSystem API or we get an infinite loop
// since FileSystem uses Configuration API. Use java.io.File instead.
File file = new File(((Path)resource).toUri().getPath())
.getAbsoluteFile();
if (file.exists()) {
if (!quiet) {
LOG.info("parsing File " + file);
}
doc = parse(builder, new BufferedInputStream(
new FileInputStream(file)), ((Path)resource).toString());
}
} else if (resource instanceof InputStream) {
doc = parse(builder, (InputStream) resource, null);
returnCachedProperties = true;
} else if (resource instanceof Properties) {
overlay(properties, (Properties)resource);
} else if (resource instanceof Element) {
root = (Element)resource;
}
if (doc == null && root == null) {
if (quiet)
return null;
throw new RuntimeException(resource + " not found");
}
if (root == null) {
root = doc.getDocumentElement();
}
Properties toAddTo = properties;
if(returnCachedProperties) {
toAddTo = new Properties();
}
if (!"configuration".equals(root.getTagName()))
LOG.fatal("bad conf file: top-level element not <configuration>");
NodeList props = root.getChildNodes();
for (int i = 0; i < props.getLength(); i++) {
Node propNode = props.item(i);
if (!(propNode instanceof Element))
continue;
Element prop = (Element)propNode;
if ("configuration".equals(prop.getTagName())) {
loadResource(toAddTo, new Resource(prop, name), quiet);
continue;
}
if (!"property".equals(prop.getTagName()))
LOG.warn("bad conf file: element not <property>");
NodeList fields = prop.getChildNodes();
String attr = null;
String value = null;
boolean finalParameter = false;
LinkedList<String> source = new LinkedList<String>();
for (int j = 0; j < fields.getLength(); j++) {
Node fieldNode = fields.item(j);
if (!(fieldNode instanceof Element))
continue;
Element field = (Element)fieldNode;
if ("name".equals(field.getTagName()) && field.hasChildNodes())
attr = StringInterner.weakIntern(
((Text)field.getFirstChild()).getData().trim());
if ("value".equals(field.getTagName()) && field.hasChildNodes())
value = StringInterner.weakIntern(
((Text)field.getFirstChild()).getData());
if ("final".equals(field.getTagName()) && field.hasChildNodes())
finalParameter = "true".equals(((Text)field.getFirstChild()).getData());
if ("source".equals(field.getTagName()) && field.hasChildNodes())
source.add(StringInterner.weakIntern(
((Text)field.getFirstChild()).getData()));
}
source.add(name);
// Ignore this parameter if it has already been marked as 'final'
if (attr != null) {
if (deprecatedKeyMap.containsKey(attr)) {
DeprecatedKeyInfo keyInfo = deprecatedKeyMap.get(attr);
keyInfo.accessed = false;
for (String key:keyInfo.newKeys) {
// update new keys with deprecated key's value
loadProperty(toAddTo, name, key, value, finalParameter,
source.toArray(new String[source.size()]));
}
}
else {
loadProperty(toAddTo, name, attr, value, finalParameter,
source.toArray(new String[source.size()]));
}
}
}
if (returnCachedProperties) {
overlay(properties, toAddTo);
return new Resource(toAddTo, name);
}
return null;
} catch (IOException e) {
LOG.fatal("error parsing conf " + name, e);
throw new RuntimeException(e);
} catch (DOMException e) {
LOG.fatal("error parsing conf " + name, e);
throw new RuntimeException(e);
} catch (SAXException e) {
LOG.fatal("error parsing conf " + name, e);
throw new RuntimeException(e);
} catch (ParserConfigurationException e) {
LOG.fatal("error parsing conf " + name , e);
throw new RuntimeException(e);
}
}
private void overlay(Properties to, Properties from) {
for (Entry<Object, Object> entry: from.entrySet()) {
to.put(entry.getKey(), entry.getValue());
}
}
private void loadProperty(Properties properties, String name, String attr,
String value, boolean finalParameter, String[] source) {
if (value != null) {
if (!finalParameters.contains(attr)) {
properties.setProperty(attr, value);
updatingResource.put(attr, source);
} else {
LOG.warn(name+":an attempt to override final parameter: "+attr
+"; Ignoring.");
}
}
if (finalParameter) {
finalParameters.add(attr);
}
}
/**
* Write out the non-default properties in this configuration to the given
* {@link OutputStream}.
*
* @param out the output stream to write to.
*/
public void writeXml(OutputStream out) throws IOException {
writeXml(new OutputStreamWriter(out));
}
/**
* Write out the non-default properties in this configuration to the given
* {@link Writer}.
*
* @param out the writer to write to.
*/
public void writeXml(Writer out) throws IOException {
Document doc = asXmlDocument();
try {
DOMSource source = new DOMSource(doc);
StreamResult result = new StreamResult(out);
TransformerFactory transFactory = TransformerFactory.newInstance();
Transformer transformer = transFactory.newTransformer();
// Important to not hold Configuration log while writing result, since
// 'out' may be an HDFS stream which needs to lock this configuration
// from another thread.
transformer.transform(source, result);
} catch (TransformerException te) {
throw new IOException(te);
}
}
/**
* Return the XML DOM corresponding to this Configuration.
*/
private synchronized Document asXmlDocument() throws IOException {
Document doc;
try {
doc =
DocumentBuilderFactory.newInstance().newDocumentBuilder().newDocument();
} catch (ParserConfigurationException pe) {
throw new IOException(pe);
}
Element conf = doc.createElement("configuration");
doc.appendChild(conf);
conf.appendChild(doc.createTextNode("\n"));
handleDeprecation(); //ensure properties is set and deprecation is handled
for (Enumeration<Object> e = properties.keys(); e.hasMoreElements();) {
String name = (String)e.nextElement();
Object object = properties.get(name);
String value = null;
if (object instanceof String) {
value = (String) object;
}else {
continue;
}
Element propNode = doc.createElement("property");
conf.appendChild(propNode);
Element nameNode = doc.createElement("name");
nameNode.appendChild(doc.createTextNode(name));
propNode.appendChild(nameNode);
Element valueNode = doc.createElement("value");
valueNode.appendChild(doc.createTextNode(value));
propNode.appendChild(valueNode);
if (updatingResource != null) {
String[] sources = updatingResource.get(name);
if(sources != null) {
for(String s : sources) {
Element sourceNode = doc.createElement("source");
sourceNode.appendChild(doc.createTextNode(s));
propNode.appendChild(sourceNode);
}
}
}
conf.appendChild(doc.createTextNode("\n"));
}
return doc;
}
/**
* Writes out all the parameters and their properties (final and resource) to
* the given {@link Writer}
* The format of the output would be
* { "properties" : [ {key1,value1,key1.isFinal,key1.resource}, {key2,value2,
* key2.isFinal,key2.resource}... ] }
* It does not output the parameters of the configuration object which is
* loaded from an input stream.
* @param out the Writer to write to
* @throws IOException
*/
public static void dumpConfiguration(Configuration config,
Writer out) throws IOException {
JsonFactory dumpFactory = new JsonFactory();
JsonGenerator dumpGenerator = dumpFactory.createJsonGenerator(out);
dumpGenerator.writeStartObject();
dumpGenerator.writeFieldName("properties");
dumpGenerator.writeStartArray();
dumpGenerator.flush();
synchronized (config) {
for (Map.Entry<Object,Object> item: config.getProps().entrySet()) {
dumpGenerator.writeStartObject();
dumpGenerator.writeStringField("key", (String) item.getKey());
dumpGenerator.writeStringField("value",
config.get((String) item.getKey()));
dumpGenerator.writeBooleanField("isFinal",
config.finalParameters.contains(item.getKey()));
String[] resources = config.updatingResource.get(item.getKey());
String resource = UNKNOWN_RESOURCE;
if(resources != null && resources.length > 0) {
resource = resources[0];
}
dumpGenerator.writeStringField("resource", resource);
dumpGenerator.writeEndObject();
}
}
dumpGenerator.writeEndArray();
dumpGenerator.writeEndObject();
dumpGenerator.flush();
}
/**
* Get the {@link ClassLoader} for this job.
*
* @return the correct class loader.
*/
public ClassLoader getClassLoader() {
return classLoader;
}
/**
* Set the class loader that will be used to load the various objects.
*
* @param classLoader the new class loader.
*/
public void setClassLoader(ClassLoader classLoader) {
this.classLoader = classLoader;
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append("Configuration: ");
if(loadDefaults) {
toString(defaultResources, sb);
if(resources.size()>0) {
sb.append(", ");
}
}
toString(resources, sb);
return sb.toString();
}
private <T> void toString(List<T> resources, StringBuilder sb) {
ListIterator<T> i = resources.listIterator();
while (i.hasNext()) {
if (i.nextIndex() != 0) {
sb.append(", ");
}
sb.append(i.next());
}
}
/**
* Set the quietness-mode.
*
* In the quiet-mode, error and informational messages might not be logged.
*
* @param quietmode <code>true</code> to set quiet-mode on, <code>false</code>
* to turn it off.
*/
public synchronized void setQuietMode(boolean quietmode) {
this.quietmode = quietmode;
}
synchronized boolean getQuietMode() {
return this.quietmode;
}
/** For debugging. List non-default properties to the terminal and exit. */
public static void main(String[] args) throws Exception {
new Configuration().writeXml(System.out);
}
@Override
public void readFields(DataInput in) throws IOException {
clear();
int size = WritableUtils.readVInt(in);
for(int i=0; i < size; ++i) {
String key = org.apache.hadoop.io.Text.readString(in);
String value = org.apache.hadoop.io.Text.readString(in);
set(key, value);
String sources[] = WritableUtils.readCompressedStringArray(in);
updatingResource.put(key, sources);
}
}
//@Override
@Override
public void write(DataOutput out) throws IOException {
Properties props = getProps();
WritableUtils.writeVInt(out, props.size());
for(Map.Entry<Object, Object> item: props.entrySet()) {
org.apache.hadoop.io.Text.writeString(out, (String) item.getKey());
org.apache.hadoop.io.Text.writeString(out, (String) item.getValue());
WritableUtils.writeCompressedStringArray(out,
updatingResource.get(item.getKey()));
}
}
/**
* get keys matching the the regex
* @param regex
* @return Map<String,String> with matching keys
*/
public Map<String,String> getValByRegex(String regex) {
Pattern p = Pattern.compile(regex);
Map<String,String> result = new HashMap<String,String>();
Matcher m;
for(Map.Entry<Object,Object> item: getProps().entrySet()) {
if (item.getKey() instanceof String &&
item.getValue() instanceof String) {
m = p.matcher((String)item.getKey());
if(m.find()) { // match
result.put((String) item.getKey(), (String) item.getValue());
}
}
}
return result;
}
//Load deprecated keys in common
private static void addDeprecatedKeys() {
Configuration.addDeprecation("topology.script.file.name",
new String[]{CommonConfigurationKeys.NET_TOPOLOGY_SCRIPT_FILE_NAME_KEY});
Configuration.addDeprecation("topology.script.number.args",
new String[]{CommonConfigurationKeys.NET_TOPOLOGY_SCRIPT_NUMBER_ARGS_KEY});
Configuration.addDeprecation("hadoop.configured.node.mapping",
new String[]{CommonConfigurationKeys.NET_TOPOLOGY_CONFIGURED_NODE_MAPPING_KEY});
Configuration.addDeprecation("topology.node.switch.mapping.impl",
new String[]{CommonConfigurationKeys.NET_TOPOLOGY_NODE_SWITCH_MAPPING_IMPL_KEY});
Configuration.addDeprecation("dfs.df.interval",
new String[]{CommonConfigurationKeys.FS_DF_INTERVAL_KEY});
Configuration.addDeprecation("hadoop.native.lib",
new String[]{CommonConfigurationKeys.IO_NATIVE_LIB_AVAILABLE_KEY});
Configuration.addDeprecation("fs.default.name",
new String[]{CommonConfigurationKeys.FS_DEFAULT_NAME_KEY});
Configuration.addDeprecation("dfs.umaskmode",
new String[]{CommonConfigurationKeys.FS_PERMISSIONS_UMASK_KEY});
}
/**
* A unique class which is used as a sentinel value in the caching
* for getClassByName. {@see Configuration#getClassByNameOrNull(String)}
*/
private static abstract class NegativeCacheSentinel {}
public static void dumpDeprecatedKeys() {
for (Map.Entry<String, DeprecatedKeyInfo> entry : deprecatedKeyMap.entrySet()) {
String newKeys = "";
for (String newKey : entry.getValue().newKeys) {
newKeys += newKey + "\t";
}
System.out.println(entry.getKey() + "\t" + newKeys);
}
}
}