Source Code Cross Referenced for ProcessMonitor.java in  » Net » Coadunation_1.0.1 » com » rift » coad » daemon » messageservice » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Net » Coadunation_1.0.1 » com.rift.coad.daemon.messageservice 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * MessageService: The message service daemon
003:         * Copyright (C) 2007 Rift IT Contracting
004:         *
005:         * This library is free software; you can redistribute it and/or
006:         * modify it under the terms of the GNU Lesser General Public
007:         * License as published by the Free Software Foundation; either
008:         * version 2.1 of the License, or (at your option) any later version.
009:         *
010:         * This library is distributed in the hope that it will be useful,
011:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
012:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
013:         * Lesser General Public License for more details.
014:         *
015:         * You should have received a copy of the GNU Lesser General Public
016:         * License along with this library; if not, write to the Free Software
017:         * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
018:         *
019:         * ProcessMonitor.java
020:         */
021:
022:        package com.rift.coad.daemon.messageservice;
023:
024:        // logging import
025:        import org.apache.log4j.Logger;
026:
027:        /**
028:         * The object responsible for monitoring the idle message processors.
029:         *
030:         * @author Brett Chaldecott
031:         */
032:        public class ProcessMonitor {
033:
034:            // singleton
035:            private static ProcessMonitor singleton = null;
036:
037:            // the logger reference
038:            protected Logger log = Logger.getLogger(ProcessMonitor.class
039:                    .getName());
040:
041:            // private member variables
042:            private boolean terminated = false;
043:
044:            /** 
045:             * Creates a new instance of ProcessMonitor 
046:             */
047:            private ProcessMonitor() {
048:            }
049:
050:            /**
051:             * This method returns an instance of the process monitor.
052:             *
053:             * @return A reference to the process monitor singleton.
054:             */
055:            public static synchronized ProcessMonitor getInstance() {
056:                if (singleton == null) {
057:                    singleton = new ProcessMonitor();
058:                }
059:                return singleton;
060:            }
061:
062:            /**
063:             * This object will wait for the specified period of time before continuing.
064:             *
065:             * @param delay The length of time to delay processing.
066:             */
067:            public synchronized void monitor(long delay) {
068:                try {
069:                    if (terminated) {
070:                        return;
071:                    }
072:
073:                    if (delay < 0) {
074:                        log.warn("Negative value of [" + delay
075:                                + "] supplied to monitor");
076:                        return;
077:                    } else if (delay == 0) {
078:                        wait();
079:                    } else {
080:                        wait(delay);
081:                    }
082:                } catch (Exception ex) {
083:                    log.error("The monitor exited abnormally because : "
084:                            + ex.getMessage(), ex);
085:                }
086:            }
087:
088:            /**
089:             * This method notifies any waiting threads of the fact that they can
090:             * continue processing.
091:             */
092:            public synchronized void notifyProcessor() {
093:                notify();
094:            }
095:
096:            /**
097:             * This method terminates this object so no threads will wait on it.
098:             */
099:            public synchronized void terminate() {
100:                terminated = true;
101:                notify();
102:            }
103:
104:        }
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