Source Code Cross Referenced for PersistenceAssociation.java in  » Science » Cougaar12_4 » org » cougaar » core » persist » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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


001:        /*
002:         * <copyright>
003:         *  
004:         *  Copyright 1997-2004 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.core.persist;
028:
029:        import java.lang.ref.ReferenceQueue;
030:        import java.lang.ref.WeakReference;
031:
032:        /**
033:         * This class establishes an association between an object that has
034:         * been persisted and a reference number. It also captures the state
035:         * of the object.
036:         */
037:        public class PersistenceAssociation extends WeakReference {
038:
039:            /**
040:             * The id assigned to the object. This id is used to replace the
041:             * object when its actual value is not significant.
042:             */
043:            private PersistenceReference referenceId;
044:
045:            private PersistenceIdentity clientId;
046:
047:            /**
048:             * Records if the object has not yet been removed from the plan.
049:             * Used to manage the lifecycle of IdentityTable entries.
050:             */
051:            private static final int NEW = 0;
052:            private static final int ACTIVE = 1;
053:            private static final int INACTIVE = 2;
054:            private int active = NEW;
055:
056:            /**
057:             * Temporarily used to mark objects needing to be persisted or that
058:             * have been rehydrated
059:             */
060:            private boolean marked = false;
061:
062:            /**
063:             * The hashcode of the object. For efficiency (see IdentityTable).
064:             */
065:            int hash;
066:
067:            /**
068:             * Chain of associations in IdentityTable. Links together all the
069:             * entries in a hashtable bucket.
070:             */
071:            PersistenceAssociation next;
072:
073:            PersistenceAssociation(Object object, int id, ReferenceQueue refQ) {
074:                this (object, new PersistenceReference(id), refQ);
075:            }
076:
077:            PersistenceAssociation(Object object, PersistenceReference id,
078:                    ReferenceQueue refQ) {
079:                super (object, refQ);
080:                if (id == null)
081:                    throw new IllegalArgumentException(
082:                            "Null PersistenceReference");
083:                if (object == null)
084:                    throw new IllegalArgumentException("Null Object");
085:                referenceId = id;
086:                hash = System.identityHashCode(object); // Get this now before the object disappears
087:            }
088:
089:            public Object getObject() {
090:                return get();
091:            }
092:
093:            public PersistenceReference getReferenceId() {
094:                return referenceId;
095:            }
096:
097:            public PersistenceIdentity getClientId() {
098:                return clientId;
099:            }
100:
101:            public void setClientId(PersistenceIdentity newClientId) {
102:                clientId = newClientId;
103:            }
104:
105:            /**
106:             * A mark used for various purposes. During a persist operation, the
107:             * mark serves to identify associations that are being written to
108:             * this persistence delta. During rehydration, the mark is used to
109:             * identify associations that were restored from a particular delta.
110:             */
111:            public void setMarked(boolean newMarked) {
112:                marked = newMarked;
113:            }
114:
115:            public boolean isMarked() {
116:                return marked;
117:            }
118:
119:            public void setActive() {
120:                if (active == NEW)
121:                    active = ACTIVE;
122:            }
123:
124:            public void setActive(int newActive) {
125:                if (newActive > active)
126:                    active = newActive;
127:            }
128:
129:            public void setInactive() {
130:                active = INACTIVE;
131:            }
132:
133:            public boolean isActive() {
134:                return active == ACTIVE;
135:            }
136:
137:            public int getActive() {
138:                return active;
139:            }
140:
141:            public boolean isNew() {
142:                return active == NEW;
143:            }
144:
145:            public boolean isInactive() {
146:                return active == INACTIVE;
147:            }
148:
149:            public String toString() {
150:                String activity;
151:                switch (active) {
152:                default:
153:                    activity = " 0";
154:                    break;
155:                case ACTIVE:
156:                    activity = " +";
157:                    break;
158:                case INACTIVE:
159:                    activity = " -";
160:                    break;
161:                }
162:                return PersistenceServiceComponent.hc(getObject()) + activity
163:                        + " @ " + referenceId;
164:            }
165:        }
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