Source Code Cross Referenced for BasicAsyncManager.java in  » Workflow-Engines » obe-1.0 » org » obe » engine » async » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Workflow Engines » obe 1.0 » org.obe.engine.async 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*--
002:
003:         Copyright (C) 2002-2005 Adrian Price.
004:         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 disclaimer that follows
015:            these conditions in the documentation and/or other materials
016:            provided with the distribution.
017:
018:         3. The names "OBE" and "Open Business Engine" must not be used to
019:         	endorse or promote products derived from this software without prior
020:         	written permission.  For written permission, please contact
021:         	adrianprice@sourceforge.net.
022:
023:         4. Products derived from this software may not be called "OBE" or
024:         	"Open Business Engine", nor may "OBE" or "Open Business Engine"
025:         	appear in their name, without prior written permission from
026:         	Adrian Price (adrianprice@users.sourceforge.net).
027:
028:         THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
029:         WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
030:         OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
031:         DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT,
032:         INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
033:         (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
034:         SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
035:         HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
036:         STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
037:         IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
038:         POSSIBILITY OF SUCH DAMAGE.
039:
040:         For more information on OBE, please see
041:         <http://obe.sourceforge.net/>.
042:
043:         */
044:
045:        package org.obe.engine.async;
046:
047:        import org.apache.commons.logging.Log;
048:        import org.apache.commons.logging.LogFactory;
049:        import org.apache.commons.pool.BasePoolableObjectFactory;
050:        import org.apache.commons.pool.ObjectPool;
051:        import org.apache.commons.pool.PoolableObjectFactory;
052:        import org.apache.commons.pool.impl.GenericObjectPool;
053:        import org.obe.spi.service.AsyncManager;
054:        import org.obe.spi.service.ServerConfig;
055:        import org.obe.spi.service.ServiceManager;
056:        import org.obe.spi.util.AsyncStartActivity;
057:        import org.obe.spi.util.AsyncStartProcess;
058:
059:        /**
060:         * A basic async execution service.  This implementation does not provide
061:         * persistence (nor does it support recovery).
062:         *
063:         * @author Adrian Price
064:         */
065:        public class BasicAsyncManager implements  AsyncManager {
066:            private static final Log _logger = LogFactory
067:                    .getLog(BasicAsyncManager.class);
068:            private final ServiceManager _svcMgr;
069:            private final PoolableObjectFactory _factory = new ThreadFactory();
070:            private final ObjectPool _threadPool;
071:
072:            private final class AsyncThread extends Thread {
073:                private Runnable _target;
074:                private volatile boolean _running;
075:
076:                AsyncThread(ThreadGroup group, String name) {
077:                    super (group, name);
078:                    start();
079:                }
080:
081:                synchronized void runTarget(Runnable target) {
082:                    if (target == null)
083:                        throw new IllegalArgumentException();
084:                    _target = target;
085:                    notify();
086:                }
087:
088:                public synchronized void start() {
089:                    if (_running)
090:                        throw new IllegalStateException();
091:                    _running = true;
092:                    super .start();
093:                }
094:
095:                synchronized void terminate() {
096:                    _running = false;
097:                    notify();
098:                }
099:
100:                public void run() {
101:                    while (_running) {
102:                        Runnable target;
103:                        synchronized (this ) {
104:                            if (_target == null) {
105:                                try {
106:                                    wait();
107:                                } catch (InterruptedException e) {
108:                                    continue;
109:                                }
110:                            }
111:                            target = _target;
112:                            _target = null;
113:                        }
114:                        try {
115:                            target.run();
116:                        } catch (Exception e) {
117:                            _logger.error("Error executing async request", e);
118:                        } finally {
119:                            // When we're done, we must return the thread to the pool.
120:                            try {
121:                                _threadPool.returnObject(this );
122:                            } catch (Exception e) {
123:                                _logger.error(
124:                                        "Error returning async thread to pool",
125:                                        e);
126:                            }
127:                        }
128:                    }
129:                }
130:            }
131:
132:            private class ThreadFactory extends BasePoolableObjectFactory {
133:                private final ThreadGroup _threadGroup = new ThreadGroup(
134:                        "obe-async");
135:                private int threadNum;
136:
137:                public Object makeObject() throws Exception {
138:                    return new AsyncThread(_threadGroup, "thread-"
139:                            + threadNum++);
140:                }
141:            }
142:
143:            public BasicAsyncManager(ServiceManager svcMgr) {
144:                _svcMgr = svcMgr;
145:                _threadPool = new GenericObjectPool(_factory, ServerConfig
146:                        .getAsyncThreadpoolSize(),
147:                        GenericObjectPool.WHEN_EXHAUSTED_BLOCK, -1);
148:            }
149:
150:            public void asyncRequest(AsyncRequest request) {
151:                try {
152:                    AsyncThread thread = (AsyncThread) _threadPool
153:                            .borrowObject();
154:                    if (_logger.isDebugEnabled()) {
155:                        _logger.debug("Enqueuing request " + request + " on "
156:                                + thread);
157:                    }
158:                    thread.runTarget(request);
159:                } catch (Exception e) {
160:                    _logger.error(e);
161:                }
162:            }
163:
164:            public void asyncStartActivity(String processInstanceId,
165:                    String activityInstanceId) {
166:
167:                asyncRequest(new AsyncStartActivity(processInstanceId,
168:                        activityInstanceId));
169:            }
170:
171:            public void asyncStartProcess(String processInstanceId) {
172:                asyncRequest(new AsyncStartProcess(processInstanceId));
173:            }
174:
175:            public ServiceManager getServiceManager() {
176:                return _svcMgr;
177:            }
178:
179:            public String getServiceName() {
180:                return SERVICE_NAME;
181:            }
182:
183:            public void init() {
184:            }
185:
186:            public void exit() {
187:            }
188:        }
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