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/* -*- Mode: Java; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
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 */

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

/**
 * This interface is an abstraction of the various threadpool implementations.
 *
 * @see         com.sun.star.lib.uno.environments.remote.ThreadPoolManager
 * @since       UDK1.0
 */
public interface IThreadPool {
    /**
     * Retrieves the global threadId for the current thread.
     *
     * @return the thread id.
     */
    ThreadId getThreadId();

    /**
     * Attaches this thread to the thread pool.
     *
     * @see                 #enter
     */
    void attach();

    /**
     * As above, but hands in an already existing instance of the threadid of
     * the current thread.
     *
     * The function exists for performance.
     *
     * @return Returns a handle which can be used in enter and detach calls.
     * @see #attach
     */
    Object attach( ThreadId id );

    /**
     * Detaches this thread from the thread pool.
     * @see                 #enter
     */
    void detach();

    /**
     * As above, but hands in an already existing instance of the threadid of
     * the current thread and a handle returned by attach.
     *
     * The function exists for performance.
     *
     * @see #attach()
     * @see #detach()
     */
    void detach( Object handle, ThreadId id );

    /**
     * Lets this thread enter the thread pool.
     *
     * This thread then executes all jobs put via putJob until
     * a reply job arrives.
     *
     * @see                 #putJob
     */
    Object enter() throws Throwable;

    /**
     * As above but hands in an already existing instance of the threadid of
     * the current thread and a handle returned by attach.
     *
     * This thread then executes all jobs put via putJob until
     * a reply job arrives.
     *
     * @see                 #putJob
     */
    Object enter( Object handle, ThreadId id ) throws Throwable;

    /**
     * Queues a job into the jobQueue of the thread belonging to the jobs
     * threadId.
     *
     * @param job       the job
     */
    void putJob(Job job);

    /**
     * Disposes this thread pool, thus releasing all threads by throwing a
     * DisposedException with the given Throwable cause.
     *
     * @param throwable   the cause
     */
    void dispose(Throwable throwable);


    /**
     * Destroys the thread pool and tries to join all created threads immediately.
     */
    void destroy();
}

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