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package com.sun.star.lib.uno.environments.remote;

/**
 * This class implements a java thread pool.
 * <p>
 * @version 	$Revision: 1.13 $ $ $Date: 2008-04-11 11:20:22 $
 * @author 	    Kay Ramme
 * @see         com.sun.star.uno.UnoRuntime
 * @see         com.sun.star.lib.uno.environments.remote.ThreadPool
 * @see         com.sun.star.lib.uno.environments.remote.IThreadPool
 * @see         com.sun.star.lib.uno.environments.remote.Job
 * @see         com.sun.star.lib.uno.environments.remote.JobQueue
 * @since       UDK1.0
 */
public class JavaThreadPool implements IThreadPool {
	/**
	 * When set to true, enables various debugging output.
	 */
	private static final boolean DEBUG = false;

	JavaThreadPoolFactory _javaThreadPoolFactory;

	JavaThreadPool(JavaThreadPoolFactory javaThreadPoolFactory) {
		_javaThreadPoolFactory = javaThreadPoolFactory;
	}

    public ThreadId getThreadId() {
        return JavaThreadPoolFactory.getThreadId();
    }

    public Object attach( ThreadId threadId )
    {
		if(DEBUG) System.err.println("##### " + getClass().getName() + ".attach - id:" + threadId);
		JobQueue jobQueue = _javaThreadPoolFactory.getJobQueue(threadId);
		if(jobQueue == null)
			jobQueue = new JobQueue(_javaThreadPoolFactory, threadId, false);

		// acquiring the jobQueue registers it at the ThreadPoolFactory
		jobQueue.acquire();
        return jobQueue;
    }
    
	public void attach() {
        attach( getThreadId() );
	}

	public void detach( Object handle, ThreadId id )
    {
        ((JobQueue)handle).release();
    }
    
	public void detach() {
        ThreadId threadId =  getThreadId();
        detach(_javaThreadPoolFactory.getJobQueue(threadId), threadId );
	}

    
	public Object enter( ) throws Throwable {
        ThreadId threadId = getThreadId();
        return enter( _javaThreadPoolFactory.getJobQueue( threadId ), threadId  );
	}

	public Object enter( Object handle, ThreadId threadId ) throws Throwable {
		return ((JobQueue)handle).enter(this);
	}

	public void putJob(Job job) {
		if (!job.isRequest() || job.isSynchronous()) {
			JobQueue jobQueue = _javaThreadPoolFactory.getJobQueue(job.getThreadId());

			// this has not be synchronized, cause
			// sync jobs can only come over one bridge 
			// (cause the thread blocks on other side)
			if(jobQueue == null)
				jobQueue = new JobQueue(_javaThreadPoolFactory, job.getThreadId(), true);

			// put job acquires the queue and registers it at the ThreadPoolFactory
			jobQueue.putJob(job, this);
		}
		else {
			// this has to be synchronized, cause
			// async jobs of the same thread can come
			// over different bridges
			synchronized(_javaThreadPoolFactory) {
				JobQueue async_jobQueue = _javaThreadPoolFactory.getAsyncJobQueue(job.getThreadId());

				// ensure there is jobQueue
				if(async_jobQueue == null) // so, there is really no async queue
					async_jobQueue = new JobQueue(_javaThreadPoolFactory, job.getThreadId());

				// put job acquires the queue and registers it at the ThreadPoolFactory
				async_jobQueue.putJob(job, this);
			}
		}
	}

	public void dispose(Throwable throwable) {
		if(DEBUG) System.err.println("##### " + getClass().getName() + ".dispose:" + throwable);

		_javaThreadPoolFactory.dispose(this, throwable);
	}

	public void destroy() {
	}
}