| /* |
| * 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.forrest.locationmap; |
| |
| import java.io.IOException; |
| import java.util.Collections; |
| import java.util.Date; |
| import java.util.Iterator; |
| import java.util.Map; |
| import java.util.HashMap; |
| |
| import org.apache.forrest.locationmap.lm.LocationMap; |
| import org.apache.avalon.framework.activity.Disposable; |
| import org.apache.avalon.framework.configuration.Configurable; |
| import org.apache.avalon.framework.configuration.Configuration; |
| import org.apache.avalon.framework.configuration.ConfigurationException; |
| import org.apache.avalon.framework.configuration.NamespacedSAXConfigurationHandler; |
| import org.apache.avalon.framework.logger.AbstractLogEnabled; |
| import org.apache.avalon.framework.service.ServiceException; |
| import org.apache.avalon.framework.service.ServiceManager; |
| import org.apache.avalon.framework.service.Serviceable; |
| import org.apache.avalon.framework.thread.ThreadSafe; |
| import org.apache.cocoon.components.modules.input.InputModule; |
| import org.apache.excalibur.source.Source; |
| import org.apache.excalibur.source.SourceResolver; |
| import org.apache.excalibur.source.SourceValidity; |
| import org.apache.excalibur.xml.sax.SAXParser; |
| import org.xml.sax.InputSource; |
| import org.xml.sax.SAXException; |
| |
| /** |
| * Resolves a request against a LocationMap. |
| */ |
| public class LocationMapModule extends AbstractLogEnabled |
| implements InputModule, Serviceable, Configurable, Disposable, ThreadSafe { |
| |
| private static final Iterator ATTNAMES = Collections.EMPTY_LIST.iterator(); |
| |
| private ServiceManager m_manager; |
| private SourceResolver m_resolver; |
| private String m_src; |
| private SourceValidity m_srcVal; |
| private LocationMap m_lm; |
| private boolean m_cacheAll; |
| private int m_cacheTtl; |
| private Date m_cacheLastLoaded; |
| private Map m_locationsCache; |
| |
| // ---------------------------------------------------- lifecycle |
| |
| public LocationMapModule() { |
| } |
| |
| public void service(ServiceManager manager) throws ServiceException { |
| m_manager = manager; |
| m_resolver = (SourceResolver) manager.lookup(SourceResolver.ROLE); |
| } |
| |
| public void configure(Configuration configuration) throws ConfigurationException { |
| m_src = configuration.getChild("file").getAttribute("src"); |
| m_cacheAll = configuration.getChild("cacheable").getValueAsBoolean(true); |
| m_cacheTtl = configuration.getChild("cache-lifespan").getValueAsInteger(); |
| |
| debug("LM Configured cache? " + m_cacheAll); |
| debug("LM Configured cache-lifespan: " + m_cacheTtl); |
| |
| if (m_cacheAll == true) { |
| m_locationsCache = new HashMap(); |
| m_cacheLastLoaded = new Date(); |
| } |
| } |
| |
| public void dispose() { |
| m_lm.dispose(); |
| m_locationsCache = null; |
| } |
| |
| private LocationMap getLocationMap() throws Exception { |
| Source source = null; |
| try { |
| source = m_resolver.resolveURI(m_src); |
| if (m_lm == null) { |
| synchronized (this) { |
| if (m_lm == null) { |
| if (getLogger().isDebugEnabled()) { |
| getLogger().debug("loading location map at " + m_src); |
| } |
| m_srcVal = source.getValidity(); |
| m_lm = new LocationMap(m_manager); |
| m_lm.enableLogging(getLogger()); |
| m_lm.build(loadConfiguration(source)); |
| } |
| } |
| } |
| else { |
| SourceValidity valid = source.getValidity(); |
| if (m_srcVal != null && m_srcVal.isValid(valid) != 1) { |
| synchronized (this) { |
| if (m_srcVal != null && m_srcVal.isValid(valid) != 1) { |
| if (getLogger().isDebugEnabled()) { |
| getLogger().debug("reloading location map at " + m_src); |
| } |
| m_srcVal = valid; |
| m_lm.dispose(); |
| m_lm = new LocationMap(m_manager); |
| m_lm.enableLogging(getLogger()); |
| m_lm.build(loadConfiguration(source)); |
| } |
| } |
| } |
| } |
| } |
| finally { |
| if (source != null) { |
| m_resolver.release(source); |
| } |
| } |
| m_cacheLastLoaded = new Date(); |
| |
| return m_lm; |
| } |
| |
| private Configuration loadConfiguration(Source source) throws ConfigurationException { |
| Configuration configuration = null; |
| SAXParser parser = null; |
| try { |
| parser = (SAXParser) m_manager.lookup(SAXParser.ROLE); |
| NamespacedSAXConfigurationHandler handler = |
| new NamespacedSAXConfigurationHandler(); |
| parser.parse(new InputSource(source.getInputStream()),handler); |
| configuration = handler.getConfiguration(); |
| } |
| catch (IOException e) { |
| throw new ConfigurationException("Unable to build LocationMap.",e); |
| } |
| catch (SAXException e) { |
| throw new ConfigurationException("Unable to build LocationMap.",e); |
| } |
| catch (ServiceException e) { |
| throw new ConfigurationException("Unable to build LocationMap.",e); |
| } |
| finally { |
| if (parser != null) { |
| m_manager.release(parser); |
| } |
| } |
| return configuration; |
| } |
| |
| // ---------------------------------------------------- Module implementation |
| |
| /** |
| * Execute the current request against the locationmap returning the |
| * resulting string. |
| */ |
| public Object getAttribute( |
| final String name, |
| final Configuration modeConf, |
| final Map objectModel) |
| throws ConfigurationException { |
| |
| Object result = null; |
| boolean hasBeenCached = false; |
| |
| try { |
| if (this.m_cacheAll == true) { |
| Date now = new Date(); |
| long cacheAge = now.getTime() - m_cacheLastLoaded.getTime(); |
| debug("LM Cache current age is: " + cacheAge + "ms"); |
| |
| if (cacheAge > m_cacheTtl) { |
| debug("LM Cache has expiring - contains " + m_locationsCache.size() + " objects."); |
| synchronized (this) { |
| m_locationsCache.clear(); |
| debug("LM Cache has expired - now contains " + m_locationsCache.size() + " objects."); |
| } |
| } |
| |
| hasBeenCached = m_locationsCache.containsKey(name); |
| if (hasBeenCached == true) { |
| result = m_locationsCache.get(name); |
| if (getLogger().isDebugEnabled()) { |
| getLogger().debug("Locationmap cached location returned for hint: " + name + " value: " + result); |
| } |
| } |
| } |
| |
| if (hasBeenCached == false) { |
| result = getLocationMap().locate(name,objectModel); |
| |
| if (m_cacheAll == true) { |
| m_locationsCache.put(name,result); |
| if (getLogger().isDebugEnabled()) { |
| getLogger().debug("Locationmap caching hint: " + name + " value: " + result); |
| } |
| } |
| } |
| |
| if (result == null) { |
| String msg = "Locationmap did not return a location for hint " + name; |
| getLogger().debug(msg); |
| } |
| |
| return result; |
| } |
| catch (ConfigurationException e) { |
| throw e; |
| } |
| catch (Exception e) { |
| getLogger().error("Failure processing LocationMap.",e); |
| } |
| return null; |
| } |
| |
| /** |
| * The possibilities are endless. No way to enumerate them all. |
| * Therefore returns null. |
| */ |
| public Iterator getAttributeNames(Configuration modeConf, Map objectModel) |
| throws ConfigurationException { |
| |
| return null; |
| } |
| |
| /** |
| * Always returns only one value. Use getAttribute() instead. |
| */ |
| public Object[] getAttributeValues( |
| String name, |
| Configuration modeConf, |
| Map objectModel) |
| throws ConfigurationException { |
| |
| return new Object[] {getAttribute(name,modeConf,objectModel)}; |
| } |
| |
| /** |
| * If debugging is turned on then log a debug message. |
| * @param debugString - the debug message |
| */ |
| private final void debug(String debugString) { |
| if (getLogger().isDebugEnabled()) { |
| getLogger().debug(debugString); |
| } |
| } |
| } |