001: /* ====================================================================
002: * The Jcorporate Apache Style Software License, Version 1.2 05-07-2002
003: *
004: * Copyright (c) 1995-2002 Jcorporate Ltd. All rights reserved.
005: *
006: * Redistribution and use in source and binary forms, with or without
007: * modification, are permitted provided that the following conditions
008: * are met:
009: *
010: * 1. Redistributions of source code must retain the above copyright
011: * notice, this list of conditions and the following disclaimer.
012: *
013: * 2. Redistributions in binary form must reproduce the above copyright
014: * notice, this list of conditions and the following disclaimer in
015: * the documentation and/or other materials provided with the
016: * distribution.
017: *
018: * 3. The end-user documentation included with the redistribution,
019: * if any, must include the following acknowledgment:
020: * "This product includes software developed by Jcorporate Ltd.
021: * (http://www.jcorporate.com/)."
022: * Alternately, this acknowledgment may appear in the software itself,
023: * if and wherever such third-party acknowledgments normally appear.
024: *
025: * 4. "Jcorporate" and product names such as "Expresso" must
026: * not be used to endorse or promote products derived from this
027: * software without prior written permission. For written permission,
028: * please contact info@jcorporate.com.
029: *
030: * 5. Products derived from this software may not be called "Expresso",
031: * or other Jcorporate product names; nor may "Expresso" or other
032: * Jcorporate product names appear in their name, without prior
033: * written permission of Jcorporate Ltd.
034: *
035: * 6. No product derived from this software may compete in the same
036: * market space, i.e. framework, without prior written permission
037: * of Jcorporate Ltd. For written permission, please contact
038: * partners@jcorporate.com.
039: *
040: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
041: * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
042: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
043: * DISCLAIMED. IN NO EVENT SHALL JCORPORATE LTD OR ITS CONTRIBUTORS
044: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
045: * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
046: * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
047: * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
048: * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
049: * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
050: * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
051: * SUCH DAMAGE.
052: * ====================================================================
053: *
054: * This software consists of voluntary contributions made by many
055: * individuals on behalf of the Jcorporate Ltd. Contributions back
056: * to the project(s) are encouraged when you make modifications.
057: * Please send them to support@jcorporate.com. For more information
058: * on Jcorporate Ltd. and its products, please see
059: * <http://www.jcorporate.com/>.
060: *
061: * Portions of this software are based upon other open source
062: * products and are subject to their respective licenses.
063: */
064:
065: package com.jcorporate.expresso.services.asyncprocess;
066:
067: /**
068: * Thread that processes asynchronous requests.
069: * @author Michael Rimov
070: * @version $Revision: 1.7 $ on $Date: 2004/11/17 20:48:17 $
071: */
072:
073: import com.jcorporate.expresso.core.registry.ExpressoThread;
074:
075: import java.util.LinkedList;
076:
077: public class ProcessThread extends ExpressoThread {
078: private boolean done = false;
079:
080: /**
081: * Our parent
082: */
083: DefaultAsyncProcessor parent;
084:
085: /**
086: * The current process. null if none current
087: */
088: DefaultAsyncProcessor.ProcessWrapper curProcess = null;
089:
090: /**
091: * USed to make sure curProcess doesn't turn null midst of our manipulation
092: * of it.
093: */
094: Object writeLock = new Object();
095:
096: /**
097: * Constructor
098: *
099: * @param processor the processor that launched the thread
100: * @param group the threadgroup that this thread belongs to
101: * @param name the name of the process thread
102: */
103: public ProcessThread(DefaultAsyncProcessor processor,
104: ThreadGroup group, String name) {
105: super (group, name);
106: parent = processor;
107: }
108:
109: /**
110: * Interrupt and cause the thread to exit.
111: */
112: public void interrupt() {
113: done = true;
114: synchronized (writeLock) {
115: if (curProcess != null) {
116: curProcess.getWrappedObject().kill();
117: }
118: }
119:
120: super .interrupt();
121: }
122:
123: /**
124: * Run the process wrapper in this thread. If we get interrupted then
125: * we exit.
126: */
127: public void run() {
128: super .run();
129:
130: LinkedList queue = parent.getQueue();
131: while (!done) {
132: synchronized (queue) {
133: if (queue.size() == 0) {
134: try {
135: queue.wait();
136: } catch (InterruptedException ex) {
137: if (done) {
138: return;
139: }
140:
141: continue;
142: }
143: synchronized (writeLock) {
144: curProcess = (DefaultAsyncProcessor.ProcessWrapper) queue
145: .removeFirst();
146: }
147: }
148: }
149:
150: curProcess.process();
151:
152: synchronized (writeLock) {
153: curProcess = null;
154: }
155: }
156: }
157: }
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