Source Code Cross Referenced for ProviderDescriptionQueryImpl.java in  » Science » Cougaar12_4 » org » cougaar » servicediscovery » transaction » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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


001:        /*
002:         * <copyright>
003:         *  
004:         *  Copyright 2002-2004 BBNT Solutions, LLC
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.servicediscovery.transaction;
028:
029:        import java.io.Serializable;
030:        import java.util.Collections;
031:        import java.util.Set;
032:
033:        import org.cougaar.core.mts.MessageAddress;
034:        import org.cougaar.core.relay.Relay;
035:        import org.cougaar.core.util.UID;
036:        import org.cougaar.servicediscovery.description.ProviderDescription;
037:
038:        /**
039:         * Package-private implementation of a ProviderDescriptionQuery.
040:         * <p>
041:         * This uses the Relay support to transfer the data
042:         * between the source agent and target agent.
043:         */
044:        public class ProviderDescriptionQueryImpl implements 
045:                ProviderDescriptionQuery, Relay.Source, Relay.Target,
046:                Serializable {
047:
048:            private final UID uid;
049:            private final MessageAddress source;
050:            private final MessageAddress target;
051:            private final UID requestUID;
052:            private final String key;
053:            private ProviderDescription providerDesc;
054:
055:            private transient Set _targets;
056:            private transient Relay.TargetFactory _factory;
057:
058:            public ProviderDescriptionQueryImpl(UID uid, MessageAddress source,
059:                    MessageAddress target, UID requestUID, String key) {
060:                this .uid = uid;
061:                this .source = source;
062:                this .target = target;
063:                this .requestUID = requestUID;
064:                this .key = key;
065:
066:                if ((uid == null) || (source == null) || (target == null)
067:                        || (requestUID == null) || (key == null)) {
068:                    throw new IllegalArgumentException(
069:                            "null uid/source/target/requestUID/key");
070:                }
071:
072:                if (source.equals(target)) {
073:                    throw new IllegalArgumentException(
074:                            "Source and target addresses are equal (" + uid
075:                                    + ", " + source + ", " + target + ")");
076:                }
077:                cacheTargets();
078:            }
079:
080:            /**
081:             * UID support from unique-object.
082:             * @return The UID of the object.
083:             */
084:            public UID getUID() {
085:                return uid;
086:            }
087:
088:            /**
089:             * Set the UID. 
090:             * @param uid the UID of the object.
091:             */
092:            public void setUID(UID uid) {
093:                throw new UnsupportedOperationException();
094:            }
095:
096:            /**
097:             * Address of the requesting agent.
098:             * @return The address of the agent.
099:             */
100:            public MessageAddress getSource() {
101:                return source;
102:            }
103:
104:            /**
105:             * Address of the agent that was contacted.
106:             * @return The address of the agent.
107:             */
108:            public MessageAddress getTarget() {
109:                return target;
110:            }
111:
112:            /**
113:             * Unique identifier of the request for provider descriptions.
114:             * @return UID of the request object.
115:             */
116:            public UID getRequestUID() {
117:                return requestUID;
118:            }
119:
120:            /**
121:             * The key for looking up the provider's description.
122:             * @return Key that maps to provider's description.
123:             */
124:            public String getKey() {
125:                return key;
126:            }
127:
128:            /**
129:             * Provider description describing the provider and its services.
130:             * @return ProviderDescription matching the request.  
131:             */
132:            public ProviderDescription getProviderDescription() {
133:                return providerDesc;
134:            }
135:
136:            /**
137:             * Set the provider description.
138:             * @param providerDesc the ProviderDescripton
139:             */
140:            public void setProviderDescription(ProviderDescription providerDesc) {
141:                this .providerDesc = providerDesc;
142:                // caller *must* "publishChange()" this object to make
143:                // the provider desc be sent back to the caller.
144:            }
145:
146:            // Relay.Source:
147:            private void cacheTargets() {
148:                _targets = Collections.singleton(target);
149:                _factory = new ProviderDescriptionQueryImplFactory(target);
150:            }
151:
152:            public Set getTargets() {
153:                return _targets;
154:            }
155:
156:            public Object getContent() {
157:                return this ;
158:            }
159:
160:            public Relay.TargetFactory getTargetFactory() {
161:                return _factory;
162:            }
163:
164:            public int updateResponse(MessageAddress target, Object response) {
165:                // assert targetAgent.equals(target)
166:                // assert response != null
167:                ProviderDescriptionQueryImpl r = (ProviderDescriptionQueryImpl) response;
168:                ProviderDescription pd = r.getProviderDescription();
169:                // check for change
170:                if ((providerDesc == null) ? (pd != null) : (!providerDesc
171:                        .equals(pd))) {
172:                    providerDesc = pd;
173:                    return Relay.RESPONSE_CHANGE;
174:                } else {
175:                    return Relay.NO_CHANGE;
176:                }
177:            }
178:
179:            // Relay.Target:
180:
181:            public Object getResponse() {
182:                return (providerDesc != null ? this  : null);
183:            }
184:
185:            public int updateContent(Object content, Token token) {
186:                return Relay.NO_CHANGE;
187:            }
188:
189:            public boolean equals(Object o) {
190:                if (o == this ) {
191:                    return true;
192:                } else if (!(o instanceof  ProviderDescriptionQueryImpl)) {
193:                    return false;
194:                } else {
195:                    UID u = ((ProviderDescriptionQueryImpl) o).uid;
196:                    return uid.equals(u);
197:                }
198:            }
199:
200:            public int hashCode() {
201:                return uid.hashCode();
202:            }
203:
204:            private void readObject(java.io.ObjectInputStream os)
205:                    throws ClassNotFoundException, java.io.IOException {
206:                os.defaultReadObject();
207:                cacheTargets();
208:            }
209:
210:            public String toString() {
211:                return "ProviderDescriptionQuery {" + "\n uid:         " + uid
212:                        + "\n source:      " + source + "\n target:      "
213:                        + target + "\n requestUID:  " + requestUID
214:                        + "\n key:         " + key + "\n providerDesc: "
215:                        + providerDesc + "\n}";
216:            }
217:
218:            /**
219:             * Simple factory implementation.
220:             */
221:            private static class ProviderDescriptionQueryImplFactory implements 
222:                    Relay.TargetFactory, Serializable {
223:
224:                private final MessageAddress target;
225:
226:                public ProviderDescriptionQueryImplFactory(MessageAddress target) {
227:                    this .target = target;
228:                }
229:
230:                public Relay.Target create(UID uid, MessageAddress source,
231:                        Object content, Relay.Token token) {
232:                    ProviderDescriptionQueryImpl p = (ProviderDescriptionQueryImpl) content;
233:                    return new ProviderDescriptionQueryImpl(p.uid, p.source,
234:                            p.target, p.requestUID, p.key);
235:                }
236:            }
237:        }
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