/*
 * JBoss, Home of Professional Open Source.
 * See the COPYRIGHT.txt file distributed with this work for information
 * regarding copyright ownership.  Some portions may be licensed
 * to Red Hat, Inc. under one or more contributor license agreements.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301 USA.
 * Modified by
 * @author  Data Virtuality GmbH
 * @date    $Date$
 */

//https://issues.jboss.org/browse/TEIID-1092
package org.teiid.dqp.internal.process;

import java.util.LinkedList;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.FutureTask;

import javax.resource.spi.work.Work;

import org.teiid.dqp.internal.process.DQPCore.CompletionListener;
import org.teiid.dqp.internal.process.ThreadReuseExecutor.PrioritizedRunnable;
import org.teiid.logging.LogConstants;
import org.teiid.logging.LogManager;

// https://issues.jboss.org/browse/TEIID-2637
public final class FutureWork<T> extends FutureTask<T> implements PrioritizedRunnable, Work {
    private int priority;
    private long creationTime = System.currentTimeMillis();
    private DQPWorkContext workContext = DQPWorkContext.getWorkContext();
    private List<CompletionListener<T>> completionListeners = new LinkedList<CompletionListener<T>>();
    private String parentName;

    public FutureWork(final Callable<T> processor, int priority) {
        super(processor);
        this.parentName = Thread.currentThread().getName();
        this.priority = priority;
    }

    public FutureWork(final Runnable processor, T result, int priority) {
        super(processor, result);
        this.priority = priority;
    }

    @Override
    public void run() {
        LogManager.logDetail(LogConstants.CTX_DQP, "Running task for parent thread", parentName); //$NON-NLS-1$
        super.run();
    }

    @Override
    public int getPriority() {
        return priority;
    }

    @Override
    public long getCreationTime() {
        return creationTime;
    }

    @Override
    public DQPWorkContext getDqpWorkContext() {
        return workContext;
    }

    @Override
    public void release() {

    }

    synchronized void addCompletionListener(CompletionListener<T> completionListener) {
        if (this.isDone()) {
            completionListener.onCompletion(this);
            return;
        }
        this.completionListeners.add(completionListener);
    }

    @Override
    protected synchronized void done() {
        for (CompletionListener<T> listener : this.completionListeners) {
            try {
                listener.onCompletion(this);
            } catch (Throwable t) {
                LogManager.logError(LogConstants.CTX_DQP, t, "Uncaught throwable from completion listener"); //$NON-NLS-1$
            }
        }
        completionListeners.clear();
    }

}