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 *
 * Copyright (c) 2010-2013 Oracle and/or its affiliates. All rights reserved.
 *
 * 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
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
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 * file and include the License file at packager/legal/LICENSE.txt.
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 * GPL Classpath Exception:
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package org.glassfish.enterprise.concurrent;

import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import javax.enterprise.concurrent.ManagedExecutorService;
import org.glassfish.enterprise.concurrent.internal.ManagedFutureTask;
import org.glassfish.enterprise.concurrent.internal.ManagedThreadPoolExecutor;

/**
 * Implementation of ManagedExecutorService interface. See {@code AbstractManagedExecutorService}.
 */
public class ManagedExecutorServiceImpl extends AbstractManagedExecutorService {
    
    protected final ThreadPoolExecutor threadPoolExecutor;

    // The adapter to be returned to the caller needs to have all the lifecycle 
    // methods disabled
    protected final ManagedExecutorServiceAdapter adapter;

    public ManagedExecutorServiceImpl(String name,
            ManagedThreadFactoryImpl managedThreadFactory,
            long hungTaskThreshold,
            boolean longRunningTasks,
            int corePoolSize, int maxPoolSize, int keepAliveTime, 
            TimeUnit keepAliveTimeUnit, int queueCapacity,
            ContextServiceImpl contextService,
            RejectPolicy rejectPolicy,
            RunLocation runLocation,
            boolean contextualCallback) {
        super(name, managedThreadFactory, hungTaskThreshold, longRunningTasks,
                contextService,
                contextService != null? contextService.getContextSetupProvider(): null,
                rejectPolicy,
                runLocation,
                contextualCallback);

        BlockingQueue queue;
        if (queueCapacity <= 0) {
            // unbounded queue
            queue = new LinkedBlockingQueue<>();
        } else {
            queue = new ArrayBlockingQueue<>(queueCapacity); 
        }

        threadPoolExecutor = new ManagedThreadPoolExecutor(corePoolSize, maxPoolSize, 
                keepAliveTime, keepAliveTimeUnit, queue, 
                this.managedThreadFactory);
        adapter = new ManagedExecutorServiceAdapter(this);
    }
 
    @Override
    public void execute(Runnable command) {
        ManagedFutureTask task = getNewTaskFor(command, null);
        task.submitted();
        threadPoolExecutor.execute(task);
    }

    /**
     * Returns an adapter for ManagedExecutorService instance which has its
     * life cycle operations disabled.
     * 
     * @return The ManagedExecutorService instance with life cycle operations
     *         disabled for use by application components.
     **/
    public ManagedExecutorServiceAdapter getAdapter() {
        return adapter;
    }

    @Override
    protected ExecutorService getThreadPoolExecutor() {
        return threadPoolExecutor;
    }

    @Override
    public ManagedExecutorService getExecutorForTaskListener() {
        return adapter;
    }

    @Override
    protected  ManagedFutureTask getNewTaskFor(Runnable r, V result) {
        return new ManagedFutureTask<>(this, r, result);
    }
    
    @Override
    protected ManagedFutureTask getNewTaskFor(Callable callable) {
        return new ManagedFutureTask(this, callable);
    }
}