ThreadPool.java

/*
 * Copyright (c) 2003, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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 General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
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package org.jboss.com.sun.corba.se.spi.orbutil.threadpool;

public interface ThreadPool
{
    /**
     * This method will return any instance of the WorkQueue. If the ThreadPool instance only services one WorkQueue
     * then that WorkQueue instance will be returned. If there are more than one WorkQueues serviced by this ThreadPool,
     * then this method would return a WorkQueue based on the implementation of the class that implements this
     * interface. For PE 8.0 we would return a WorkQueue in a roundrobin fashion everytime this method is called. In the
     * future we could allow pluggability of Policy objects for this.
     */
    public WorkQueue getAnyWorkQueue();

    /**
     * This method will return an instance of the of the WorkQueue given a queueId. This will be useful in situations
     * where there are more than one WorkQueues managed by the ThreadPool and the user of the ThreadPool wants to always
     * use the same WorkQueue for doing the Work. If the number of WorkQueues in the ThreadPool are 10, then queueIds
     * will go from 0-9
     * 
     * @throws NoSuchWorkQueueException
     *             thrown when queueId passed is invalid
     */
    public WorkQueue getWorkQueue(int queueId) throws NoSuchWorkQueueException;

    /**
     * This method will return the number of WorkQueues serviced by the threadpool.
     */
    public int numberOfWorkQueues();

    /**
     * This method will return the minimum number of threads maintained by the threadpool.
     */
    public int minimumNumberOfThreads();

    /**
     * This method will return the maximum number of threads in the threadpool at any point in time, for the life of the
     * threadpool
     */
    public int maximumNumberOfThreads();

    /**
     * This method will return the time in milliseconds when idle threads in the threadpool are removed.
     */
    public long idleTimeoutForThreads();

    /**
     * This method will return the current number of threads in the threadpool. This method returns a value which is not
     * synchronized.
     */
    public int currentNumberOfThreads();

    /**
     * This method will return the number of available threads in the threadpool which are waiting for work. This method
     * returns a value which is not synchronized.
     */
    public int numberOfAvailableThreads();

    /**
     * This method will return the number of busy threads in the threadpool This method returns a value which is not
     * synchronized.
     */
    public int numberOfBusyThreads();

    /**
     * This method returns the number of Work items processed by the threadpool
     */
    public long currentProcessedCount();

    /**
     * This method returns the average elapsed time taken to complete a Work item.
     */
    public long averageWorkCompletionTime();

    /**
     * This method will return the name of the threadpool.
     */
    public String getName();

}

// End of file.