Java tutorial
/* * 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.synapse.commons.beanstalk.enterprise; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.apache.synapse.commons.util.MiscellaneousUtil; import java.util.Iterator; import java.util.Map; import java.util.Properties; import java.util.concurrent.ConcurrentHashMap; import java.util.concurrent.Executors; import java.util.concurrent.ScheduledExecutorService; import java.util.concurrent.ThreadFactory; /** * Manages beanstalks configured in the Synapse Environment. Only one instance of this class is * created per Synapse environment. It is attached to the ServerContextInformation with * BeanstalkConstants.BEANSTALK_MANAGER_PROP_NAME property name. */ public class EnterpriseBeanstalkManager { private final static Log log = LogFactory.getLog(EnterpriseBeanstalkManager.class); /** * Stores all the beanstalks configured. */ private Map<String, EnterpriseBeanstalk> beanstalkMap = new ConcurrentHashMap<String, EnterpriseBeanstalk>(); /** * ScheduledExecutorService for cleaning up timed out client stubs in all beanstalks. */ private ScheduledExecutorService scheduler; /** * Initializes the beanstalk manager, which creates and initializes beanstalk defined in the * given Properties instance. * @param props Properties to read beanstalk configurations from. Usually, source of this is * synapse.properties file. */ public void init(Properties props) { if (props == null) { if (log.isDebugEnabled()) { log.debug("Beanstalk properties cannot be found."); } return; } String beanstalkNameList = MiscellaneousUtil.getProperty(props, EnterpriseBeanstalkConstants.SYNAPSE_BEANSTALK_PREFIX, null); if (beanstalkNameList == null || "".equals(beanstalkNameList)) { if (log.isDebugEnabled()) { log.debug("No beanstalks defined for initialization."); } return; } String[] beanstalkNames = beanstalkNameList.split(","); if (beanstalkNames == null || beanstalkNames.length == 0) { if (log.isDebugEnabled()) { log.debug("No beanstalk definitions found for initialization."); } return; } scheduler = Executors.newSingleThreadScheduledExecutor(new ThreadFactory() { public Thread newThread(Runnable r) { return new Thread(r, "enterprise-beanstalk-cleaner"); } }); for (String beanstalkName : beanstalkNames) { if (beanstalkName == null || beanstalkName.trim().length() == 0) { continue; } String propertyPrefix = EnterpriseBeanstalkConstants.SYNAPSE_BEANSTALK_PREFIX + "." + beanstalkName + "."; Properties currentBeanstalkProps = new Properties(); for (Map.Entry<Object, Object> entry : props.entrySet()) { if (entry.getKey() instanceof String && entry.getValue() instanceof String) { String key = (String) entry.getKey(); if (key.startsWith(propertyPrefix)) { currentBeanstalkProps.setProperty(key.replace(propertyPrefix, ""), (String) entry.getValue()); } } } EnterpriseBeanstalk beanstalk = new EnterpriseBeanstalk(beanstalkName, currentBeanstalkProps, scheduler); beanstalk.init(); beanstalkMap.put(beanstalkName, beanstalk); } } /** * Returns the beanstalk with the given name, null if it's not found. * @param name Name of the beanstalk. * @return Beanstalk specified by the name, null if it's not found. */ public EnterpriseBeanstalk getBeanstalk(String name) { return beanstalkMap.get(name); } /** * Cleans up resources allocated by this BeanstalkManager. */ public void destroy() { Iterator<EnterpriseBeanstalk> it = beanstalkMap.values().iterator(); while (it.hasNext()) { it.next().destroy(); it.remove(); } if (!scheduler.isShutdown()) { if (log.isDebugEnabled()) { log.debug("Shutting down beanstalk cleaner executor..."); } scheduler.shutdownNow(); } } }