org.apache.stratos.usage.agent.persist.UsageDataPersistenceManager.java Source code

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Here is the source code for org.apache.stratos.usage.agent.persist.UsageDataPersistenceManager.java

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/*
 *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.stratos.usage.agent.persist;

import org.apache.stratos.usage.agent.beans.BandwidthUsage;
import org.apache.stratos.usage.agent.config.UsageAgentConfiguration;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import java.util.Queue;
import java.util.concurrent.*;

public class UsageDataPersistenceManager {
    private static final Log log = LogFactory.getLog(UsageDataPersistenceManager.class);

    // queue to store Bandwidth usage statistics.
    // usage of  LinkedBlockingQueue ensures operations on the queue to wait for the queue to be non
    // empty when retrieving and wait for space when storing element.
    private Queue<BandwidthUsage> persistenceJobs = new LinkedBlockingQueue<BandwidthUsage>();

    private final ScheduledExecutorService scheduler;

    private UsageAgentConfiguration configuration;

    public UsageDataPersistenceManager(UsageAgentConfiguration configuration) {
        scheduler = Executors.newScheduledThreadPool(2, new UsageDataPersistenceThreadFactory());
        this.configuration = configuration;
    }

    /**
     * this method add bandwidth usage entries to the jobQueue
     *
     * @param usage Bandwidth usage
     */

    public void addToQueue(BandwidthUsage usage) {
        persistenceJobs.add(usage);
    }

    public void scheduleUsageDataPersistenceTask() {
        //we will schedule the usage data persistence task only if interval is not -1
        if (configuration.getUsageTasksExecutionIntervalInMilliSeconds() > 0) {
            scheduler.scheduleWithFixedDelay(new UsageDataPersistenceTask(persistenceJobs, configuration),
                    configuration.getUsageTasksStartupDelayInMilliSeconds(),
                    configuration.getUsageTasksExecutionIntervalInMilliSeconds(), TimeUnit.MILLISECONDS);
            log.debug("Usage data persistence task was scheduled");
        } else {
            log.debug("Usage data persistence task is disabled");
        }
    }

    public void scheduleBandwidthUsageDataRetrievalTask() {
        //we will schedule the usage data retrieval task only if interval is not -1
        if (configuration.getUsageTasksExecutionIntervalInMilliSeconds() > 0) {
            scheduler.scheduleWithFixedDelay(new BandwidthUsageDataRetrievalTask(configuration),
                    configuration.getUsageTasksStartupDelayInMilliSeconds(),
                    configuration.getUsageTasksExecutionIntervalInMilliSeconds(), TimeUnit.MILLISECONDS);
            log.debug("Bandwidth Usage data retrieval task was scheduled");
        } else {
            log.debug("Bandwidth Usage data retrieval task was disabled");
        }
    }

    class UsageDataPersistenceThreadFactory implements ThreadFactory {
        private int counter = 0;

        public Thread newThread(Runnable r) {
            return new Thread(r, "UsageDataPersistenceThread-" + counter++);
        }
    }
}