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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
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 * or LICENSE.txt.  See the License for the specific
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 * file and include the License file at LICENSE.txt.
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package org.shoal.ha.cache.impl.util;

import java.util.concurrent.*;

/**
 * @author Mahesh Kannan
 */
public class ASyncReplicationManager {

    private static final Object _lock = new Object();

    private static volatile ASyncReplicationManager _me = new ASyncReplicationManager();

    private static volatile ASyncThreadPool _asyncPool;

    private static ScheduledThreadPoolExecutor _scheduledTP;

    public static ASyncReplicationManager _getInstance() {
        return _me;
    }

    private ASyncReplicationManager() {
        int corePoolSize = getSystemProp("org.shoal.ha.threadpool.core.pool.size", 16);
        int maxPoolSize = getSystemProp("org.shoal.ha.threadpool.max.pool.size", 16);
        int keepAliveInSeconds = getSystemProp("org.shoal.ha.threadpool.keepalive.in.seconds", 300);
        int boundedPoolSize = getSystemProp("org.shoal.ha.threadpool.max.pending.replication.limit", 32 * 1024);

        LinkedBlockingQueue queue = new LinkedBlockingQueue(boundedPoolSize);
        _asyncPool = new ASyncThreadPool(corePoolSize, maxPoolSize, keepAliveInSeconds, queue);

        //TODO Should we another system property?
        _scheduledTP = new ScheduledThreadPoolExecutor(2);

//        System.out.println("Created ExecutorService with: " +
//            "core=" + corePoolSize + "; max=" + maxPoolSize +
//            "; keepAlive=" + keepAliveInSeconds + "; maxLimit=" + boundedPoolSize);
    }

    private static final int getSystemProp(String propName, int defaultValue) {
        int value = defaultValue;
        try {
            value = Integer.parseInt(System.getProperty(propName, "" + defaultValue));
        } catch (Exception ex) {
            //Ignore
        }

        return value;
    }

    public ThreadPoolExecutor getExecutorService() {
        return _asyncPool;
    }

    public ScheduledThreadPoolExecutor getScheduledThreadPoolExecutor() {
        return _scheduledTP;
    }
}