Source Code Cross Referenced for CommunityRequestQueue.java in  » Science » Cougaar12_4 » org » cougaar » community » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Science » Cougaar12_4 » org.cougaar.community 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * <copyright>
003:         *
004:         *  Copyright 2001-2004 Mobile Intelligence Corp
005:         *  under sponsorship of the Defense Advanced Research Projects
006:         *  Agency (DARPA).
007:         *
008:         *  You can redistribute this software and/or modify it under the
009:         *  terms of the Cougaar Open Source License as published on the
010:         *  Cougaar Open Source Website (www.cougaar.org).
011:         *
012:         *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
013:         *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
014:         *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
015:         *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
016:         *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
017:         *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
018:         *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
019:         *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
020:         *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
021:         *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
022:         *  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
023:         *
024:         * </copyright>
025:         */
026:
027:        package org.cougaar.community;
028:
029:        import java.util.ArrayList;
030:        import java.util.Collections;
031:        import java.util.List;
032:
033:        import javax.naming.directory.ModificationItem;
034:
035:        import org.cougaar.core.component.ServiceBroker;
036:        import org.cougaar.core.service.AlarmService;
037:        import org.cougaar.core.service.LoggingService;
038:        import org.cougaar.core.service.AgentIdentificationService;
039:        import org.cougaar.core.agent.service.alarm.Alarm;
040:        import org.cougaar.core.mts.MessageAddress;
041:
042:        import org.cougaar.util.log.Logger;
043:
044:        import org.cougaar.core.service.community.CommunityResponseListener;
045:        import org.cougaar.core.service.community.Entity;
046:
047:        /**
048:         * Queue for processing Community Requests at a future time.  This is
049:         * typically used to hold requests that have failed and are to be retried.
050:         * For instance, a WP lookup.
051:         */
052:        public class CommunityRequestQueue {
053:
054:            private List queue = Collections.synchronizedList(new ArrayList());
055:            private RequestQueueTimer timer;
056:            private DefaultCommunityServiceImpl commSvc;
057:            private Logger logger;
058:            private String agentName;
059:            private ServiceBroker serviceBroker;
060:
061:            public CommunityRequestQueue(ServiceBroker sb,
062:                    DefaultCommunityServiceImpl dcs) {
063:                serviceBroker = sb;
064:                commSvc = dcs;
065:                agentName = getAgentName();
066:                logger = (LoggingService) serviceBroker.getService(this ,
067:                        LoggingService.class, null);
068:            }
069:
070:            public synchronized void add(long delay, String communityName,
071:                    int requestType, Entity entity,
072:                    ModificationItem[] attrMods, long timeout,
073:                    CommunityResponseListener crl) {
074:                if (logger.isDebugEnabled()) {
075:                    logger.debug(agentName + ": add:" + "delay=" + delay
076:                            + " community=" + communityName + " type="
077:                            + requestType + " entity=" + entity);
078:                }
079:                QueuedRequest req = new QueuedRequest(now() + delay,
080:                        communityName, requestType, entity, attrMods, timeout,
081:                        crl);
082:                queue.add(req);
083:                execute();
084:            }
085:
086:            protected void execute() {
087:                if (logger.isDetailEnabled()) {
088:                    logger.detail(agentName + ": execute:" + " itemsInQueue="
089:                            + queue.size());
090:                }
091:                if (timer != null && !timer.hasExpired()) {
092:                    timer.cancel();
093:                }
094:                int n;
095:                List l;
096:                synchronized (queue) {
097:                    n = queue.size();
098:                    if (n <= 0) {
099:                        return;
100:                    }
101:                    l = new ArrayList(queue);
102:                    queue.clear();
103:                }
104:                long now = now();
105:                long fireAt = 0;
106:                for (int i = 0; i < n; i++) {
107:                    QueuedRequest req = (QueuedRequest) l.get(i);
108:                    if (req.processAt <= now) {
109:                        if (logger.isDebugEnabled()) {
110:                            logger.debug(agentName + ": sendCommunityRequest:"
111:                                    + " community=" + req.communityName
112:                                    + " type=" + req.type + " entity="
113:                                    + req.entity);
114:                        }
115:                        commSvc.sendCommunityRequest(req.communityName,
116:                                req.type, req.entity, req.mods, req.timeout,
117:                                req.crl);
118:                    } else { // not yet
119:                        if (fireAt == 0 || req.processAt < fireAt) {
120:                            fireAt = req.processAt;
121:                        }
122:                        queue.add(req);
123:                    }
124:                }
125:                if (fireAt > 0) {
126:                    timer = new RequestQueueTimer(fireAt);
127:                    AlarmService alarmService = (AlarmService) serviceBroker
128:                            .getService(this , AlarmService.class, null);
129:                    alarmService.addRealTimeAlarm(timer);
130:                    serviceBroker.releaseService(this , AlarmService.class,
131:                            alarmService);
132:                }
133:            }
134:
135:            protected String getAgentName() {
136:                AgentIdentificationService ais = (AgentIdentificationService) serviceBroker
137:                        .getService(this , AgentIdentificationService.class,
138:                                null);
139:                MessageAddress addr = ais.getMessageAddress();
140:                serviceBroker.releaseService(this ,
141:                        AgentIdentificationService.class, ais);
142:                return addr.toString();
143:            }
144:
145:            private long now() {
146:                return System.currentTimeMillis();
147:            }
148:
149:            class QueuedRequest {
150:                long processAt;
151:                String communityName;
152:                int type;
153:                long timeout;
154:                Entity entity;
155:                ModificationItem[] mods;
156:                CommunityResponseListener crl;
157:
158:                QueuedRequest(long time, String cname, int t, Entity e,
159:                        ModificationItem[] m, long to,
160:                        CommunityResponseListener l) {
161:                    processAt = time;
162:                    communityName = cname;
163:                    type = t;
164:                    entity = e;
165:                    mods = m;
166:                    this .timeout = to;
167:                    crl = l;
168:                }
169:            }
170:
171:            protected class RequestQueueTimer implements  Alarm {
172:                private long expiresAt;
173:                private boolean expired = false;
174:
175:                public RequestQueueTimer(long expirationTime) {
176:                    expiresAt = expirationTime;
177:                }
178:
179:                public long getExpirationTime() {
180:                    return expiresAt;
181:                }
182:
183:                public synchronized void expire() {
184:                    if (!expired) {
185:                        expired = true;
186:                        execute();
187:                    }
188:                }
189:
190:                public boolean hasExpired() {
191:                    return expired;
192:                }
193:
194:                public synchronized boolean cancel() {
195:                    boolean was = expired;
196:                    expired = true;
197:                    return was;
198:                }
199:            }
200:
201:        }
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