# EnterpriseBeanstalkManager.java

    /*
     *  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();
            }
        }
    }