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| <div class="subTitle">org.apache.hadoop.hbase.util</div> |
| <h2 title="Class DynamicClassLoader" class="title">Class DynamicClassLoader</h2> |
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| <div class="contentContainer"> |
| <ul class="inheritance"> |
| <li><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li> |
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| <li><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/ClassLoader.html?is-external=true" title="class or interface in java.lang">java.lang.ClassLoader</a></li> |
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| <ul class="inheritance"> |
| <li><a href="https://docs.oracle.com/javase/8/docs/api/java/security/SecureClassLoader.html?is-external=true" title="class or interface in java.security">java.security.SecureClassLoader</a></li> |
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| <ul class="inheritance"> |
| <li><a href="../../../../../org/apache/hadoop/hbase/util/ClassLoaderBase.html" title="class in org.apache.hadoop.hbase.util">org.apache.hadoop.hbase.util.ClassLoaderBase</a></li> |
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| <li>org.apache.hadoop.hbase.util.DynamicClassLoader</li> |
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| <hr> |
| <br> |
| <pre>@InterfaceAudience.Private |
| public class <a href="../../../../../src-html/org/apache/hadoop/hbase/util/DynamicClassLoader.html#line.54">DynamicClassLoader</a> |
| extends <a href="../../../../../org/apache/hadoop/hbase/util/ClassLoaderBase.html" title="class in org.apache.hadoop.hbase.util">ClassLoaderBase</a></pre> |
| <div class="block">This is a class loader that can load classes dynamically from new jar files under a configured |
| folder. The paths to the jar files are converted to URLs, and URLClassLoader logic is actually |
| used to load classes. This class loader always uses its parent class loader to load a class at |
| first. Only if its parent class loader can not load a class, we will try to load it using the |
| logic here. |
| <p> |
| The configured folder can be a HDFS path. In this case, the jar files under that folder will be |
| copied to local at first under ${hbase.local.dir}/jars/. The local copy will be updated if the |
| remote copy is updated, according to its last modified timestamp. |
| <p> |
| We can't unload a class already loaded. So we will use the existing jar files we already know to |
| load any class which can't be loaded using the parent class loader. If we still can't load the |
| class from the existing jar files, we will check if any new jar file is added, if so, we will |
| load the new jar file and try to load the class again. If still failed, a class not found |
| exception will be thrown. |
| <p> |
| Be careful in uploading new jar files and make sure all classes are consistent, otherwise, we may |
| not be able to load your classes properly.</div> |
| </li> |
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| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Field and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/DynamicClassLoader.html#DYNAMIC_JARS_DIR">DYNAMIC_JARS_DIR</a></span></code> </td> |
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| <tr class="rowColor"> |
| <td class="colFirst"><code>private static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/DynamicClassLoader.html#DYNAMIC_JARS_DIR_KEY">DYNAMIC_JARS_DIR_KEY</a></span></code> </td> |
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| <tr class="altColor"> |
| <td class="colFirst"><code>private static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/DynamicClassLoader.html#DYNAMIC_JARS_OPTIONAL_CONF_KEY">DYNAMIC_JARS_OPTIONAL_CONF_KEY</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private static boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/DynamicClassLoader.html#DYNAMIC_JARS_OPTIONAL_DEFAULT">DYNAMIC_JARS_OPTIONAL_DEFAULT</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private <a href="https://docs.oracle.com/javase/8/docs/api/java/util/HashMap.html?is-external=true" title="class or interface in java.util">HashMap</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>,<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/DynamicClassLoader.html#jarModifiedTime">jarModifiedTime</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private <a href="https://docs.oracle.com/javase/8/docs/api/java/io/File.html?is-external=true" title="class or interface in java.io">File</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/DynamicClassLoader.html#localDir">localDir</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private static org.slf4j.Logger</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/DynamicClassLoader.html#LOG">LOG</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private org.apache.hadoop.fs.Path</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/DynamicClassLoader.html#remoteDir">remoteDir</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private org.apache.hadoop.fs.FileSystem</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/DynamicClassLoader.html#remoteDirFs">remoteDirFs</a></span></code> </td> |
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| <tr class="rowColor"> |
| <td class="colFirst"><code>private boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/DynamicClassLoader.html#useDynamicJars">useDynamicJars</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/DynamicClassLoader.html#userConfigUseDynamicJars">userConfigUseDynamicJars</a></span></code> </td> |
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| <code><a href="../../../../../org/apache/hadoop/hbase/util/ClassLoaderBase.html#DEFAULT_LOCAL_DIR">DEFAULT_LOCAL_DIR</a>, <a href="../../../../../org/apache/hadoop/hbase/util/ClassLoaderBase.html#LOCAL_DIR_KEY">LOCAL_DIR_KEY</a>, <a href="../../../../../org/apache/hadoop/hbase/util/ClassLoaderBase.html#parent">parent</a></code></li> |
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| <h3>Constructor Summary</h3> |
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| <caption><span>Constructors</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colOne" scope="col">Constructor and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/DynamicClassLoader.html#DynamicClassLoader-org.apache.hadoop.conf.Configuration-java.lang.ClassLoader-">DynamicClassLoader</a></span>(org.apache.hadoop.conf.Configuration conf, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/ClassLoader.html?is-external=true" title="class or interface in java.lang">ClassLoader</a> parent)</code> |
| <div class="block">Creates a DynamicClassLoader that can load classes dynamically from jar files under a specific |
| folder.</div> |
| </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
| <!-- ========== METHOD SUMMARY =========== --> |
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| <h3>Method Summary</h3> |
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| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </span></span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Method and Description</th> |
| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>private void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/DynamicClassLoader.html#initTempDir-org.apache.hadoop.conf.Configuration-">initTempDir</a></span>(org.apache.hadoop.conf.Configuration conf)</code> </td> |
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| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a><?></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/DynamicClassLoader.html#loadClass-java.lang.String-">loadClass</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> name)</code> </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>private void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/DynamicClassLoader.html#loadNewJars--">loadNewJars</a></span>()</code> </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>private <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a><?></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/DynamicClassLoader.html#tryRefreshClass-java.lang.String-">tryRefreshClass</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> name)</code> </td> |
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| <h3>Methods inherited from class java.net.<a href="https://docs.oracle.com/javase/8/docs/api/java/net/URLClassLoader.html?is-external=true" title="class or interface in java.net">URLClassLoader</a></h3> |
| <code><a href="https://docs.oracle.com/javase/8/docs/api/java/net/URLClassLoader.html?is-external=true#addURL-java.net.URL-" title="class or interface in java.net">addURL</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/net/URLClassLoader.html?is-external=true#close--" title="class or interface in java.net">close</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/net/URLClassLoader.html?is-external=true#definePackage-java.lang.String-java.util.jar.Manifest-java.net.URL-" title="class or interface in java.net">definePackage</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/net/URLClassLoader.html?is-external=true#findClass-java.lang.String-" title="class or interface in java.net">findClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/net/URLClassLoader.html?is-external=true#findResource-java.lang.String-" title="class or interface in java.net">findResource</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/net/URLClassLoader.html?is-external=true#findResources-java.lang.String-" title="class or interface in java.net">findResources</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/net/URLClassLoader.html?is-external=true#getPermissions-java.security.CodeSource-" title="class or interface in java.net">getPermissions</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/net/URLClassLoader.html?is-external=true#getResourceAsStream-java.lang.String-" title="class or interface in java.net">getResourceAsStream</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/net/URLClassLoader.html?is-external=true#getURLs--" title="class or interface in java.net">getURLs</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/net/URLClassLoader.html?is-external=true#newInstance-java.net.URL:A-" title="class or interface in java.net">newInstance</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/net/URLClassLoader.html?is-external=true#newInstance-java.net.URL:A-java.lang.ClassLoader-" title="class or interface in java.net">newInstance</a></code></li> |
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| <h3>Methods inherited from class java.security.<a href="https://docs.oracle.com/javase/8/docs/api/java/security/SecureClassLoader.html?is-external=true" title="class or interface in java.security">SecureClassLoader</a></h3> |
| <code><a href="https://docs.oracle.com/javase/8/docs/api/java/security/SecureClassLoader.html?is-external=true#defineClass-java.lang.String-byte:A-int-int-java.security.CodeSource-" title="class or interface in java.security">defineClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/security/SecureClassLoader.html?is-external=true#defineClass-java.lang.String-java.nio.ByteBuffer-java.security.CodeSource-" title="class or interface in java.security">defineClass</a></code></li> |
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| <h3>Methods inherited from class java.lang.<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/ClassLoader.html?is-external=true" title="class or interface in java.lang">ClassLoader</a></h3> |
| <code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/ClassLoader.html?is-external=true#clearAssertionStatus--" title="class or interface in java.lang">clearAssertionStatus</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/ClassLoader.html?is-external=true#defineClass-byte:A-int-int-" title="class or interface in java.lang">defineClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/ClassLoader.html?is-external=true#defineClass-java.lang.String-byte:A-int-int-" title="class or interface in java.lang">defineClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/ClassLoader.html?is-external=true#defineClass-java.lang.String-byte:A-int-int-java.security.ProtectionDomain-" title="class or interface in java.lang">defineClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/ClassLoader.html?is-external=true#defineClass-java.lang.String-java.nio.ByteBuffer-java.security.ProtectionDomain-" title="class or 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