001: package com.protomatter.util;
002:
003: /**
004: * {{{ The Protomatter Software License, Version 1.0
005: * derived from The Apache Software License, Version 1.1
006: *
007: * Copyright (c) 1998-2002 Nate Sammons. All rights reserved.
008: *
009: * Redistribution and use in source and binary forms, with or without
010: * modification, are permitted provided that the following conditions
011: * are met:
012: *
013: * 1. Redistributions of source code must retain the above copyright
014: * notice, this list of conditions and the following disclaimer.
015: *
016: * 2. Redistributions in binary form must reproduce the above copyright
017: * notice, this list of conditions and the following disclaimer in
018: * the documentation and/or other materials provided with the
019: * distribution.
020: *
021: * 3. The end-user documentation included with the redistribution,
022: * if any, must include the following acknowledgment:
023: * "This product includes software developed for the
024: * Protomatter Software Project
025: * (http://protomatter.sourceforge.net/)."
026: * Alternately, this acknowledgment may appear in the software itself,
027: * if and wherever such third-party acknowledgments normally appear.
028: *
029: * 4. The names "Protomatter" and "Protomatter Software Project" must
030: * not be used to endorse or promote products derived from this
031: * software without prior written permission. For written
032: * permission, please contact support@protomatter.com.
033: *
034: * 5. Products derived from this software may not be called "Protomatter",
035: * nor may "Protomatter" appear in their name, without prior written
036: * permission of the Protomatter Software Project
037: * (support@protomatter.com).
038: *
039: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
040: * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
041: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
042: * DISCLAIMED. IN NO EVENT SHALL THE PROTOMATTER SOFTWARE PROJECT OR
043: * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
044: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
045: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
046: * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
047: * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
048: * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
049: * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
050: * SUCH DAMAGE. }}}
051: */
052:
053: import com.protomatter.syslog.Syslog;
054:
055: /**
056: * A worker thread for the <tt>WorkQueue</tt> object.
057: * Threads of this type are started by the WorkQueue to
058: * process elements of work that it's been asked to do.
059: *
060: * @see WorkQueue
061: */
062: class WorkQueueThread extends Thread {
063: private WorkQueue queue = null;
064: private int id = 0;
065:
066: /**
067: * Create a WorkQueueHandlerThread that gets work from
068: * the given WorkQueueObjectPool (an ObjectPool implementation
069: * that holds elements of work).
070: */
071: public WorkQueueThread(WorkQueue queue, ThreadGroup group, int qId,
072: String name, int id) {
073: super (group, "WorkQueueThread[q=" + qId + ", qName=" + name
074: + ", id=" + id + "]");
075: this .queue = queue;
076: this .id = id;
077: this .setDaemon(true);
078: }
079:
080: /**
081: * While there's work to do, do it, otherwise we're told to wait
082: * by the ObjectPool.
083: */
084: public void run() {
085: WorkQueue q = queue; // local refs are a little faster
086: int i = 0;
087: while (true) {
088: try {
089: // this will block until there's something to do.
090: Runnable r = q.getWork();
091: if (r != null) {
092: r.run();
093: } else {
094: // if there's nothing to do, yield
095: Thread.yield();
096: }
097: } catch (Throwable t) {
098: // should probably log this?
099: Syslog.log(this, t);
100: }
101: }
102: }
103: }
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