# ThrottleContextCleanupTask.java

    /*
    *  Copyright (c) 2015, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
    *
    *  WSO2 Inc. 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.throttle.core;

    import org.apache.commons.logging.Log;
    import org.apache.commons.logging.LogFactory;
    import org.apache.synapse.commons.throttle.core.internal.ThrottleServiceDataHolder;

    import java.util.ArrayList;
    import java.util.List;
    import java.util.concurrent.Executors;
    import java.util.concurrent.ScheduledExecutorService;
    import java.util.concurrent.ThreadFactory;
    import java.util.concurrent.TimeUnit;

    /**
     * This task is responsible for cleanup callers which has expired along with hazelcast shared params
     *
     */
    public class ThrottleContextCleanupTask {

    	private static final Log log = LogFactory.getLog(ThrottleContextCleanupTask.class);

    	private List<ThrottleContext> throttleContexts = new ArrayList<ThrottleContext>();

    	public ThrottleContextCleanupTask() {

    		ScheduledExecutorService executor = Executors.newScheduledThreadPool(1,
    				new ThreadFactory() {

    					public Thread newThread(Runnable r) {
    						Thread t = new Thread(r);
    						t.setName("Throttle Cleanup Task");
    						return t;
    					}
    				});

    		String throttleFrequency = ThrottleServiceDataHolder.getInstance().getThrottleProperties().getThrottleFrequency();

    		if (log.isDebugEnabled()) {
    			log.debug("Throttling Cleanup Task Frequency set to " + throttleFrequency);
    		}

    		executor.scheduleAtFixedRate(new CleanupTask(), Integer.parseInt(throttleFrequency),
    				Integer.parseInt(throttleFrequency), TimeUnit.MILLISECONDS);

    	}

    	public void addThrottleContext(ThrottleContext throttleContext) {
    		throttleContexts.add(throttleContext);
    	}

    	private class CleanupTask implements Runnable {

    		public void run() {
    			if(log.isDebugEnabled()) {
    				log.debug("Running the cleanup task");
    			}
    			for(ThrottleContext throttleContext : throttleContexts) {
    				throttleContext.cleanupCallers(System.currentTimeMillis());
    			}
    		}
    	}

    }