Source Code Cross Referenced for ScarabCacheKey.java in  » Issue-Tracking » scarab-0.21 » org » tigris » scarab » services » cache » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Issue Tracking » scarab 0.21 » org.tigris.scarab.services.cache 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package org.tigris.scarab.services.cache;
002:
003:        /* ================================================================
004:         * Copyright (c) 2001 Collab.Net.  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 are
008:         * 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 following disclaimer in the
015:         * documentation and/or other materials provided with the distribution.
016:         * 
017:         * 3. The end-user documentation included with the redistribution, if
018:         * any, must include the following acknowlegement: "This product includes
019:         * software developed by Collab.Net <http://www.Collab.Net/>."
020:         * Alternately, this acknowlegement may appear in the software itself, if
021:         * and wherever such third-party acknowlegements normally appear.
022:         * 
023:         * 4. The hosted project names must not be used to endorse or promote
024:         * products derived from this software without prior written
025:         * permission. For written permission, please contact info@collab.net.
026:         * 
027:         * 5. Products derived from this software may not use the "Tigris" or 
028:         * "Scarab" names nor may "Tigris" or "Scarab" appear in their names without 
029:         * prior written permission of Collab.Net.
030:         * 
031:         * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
032:         * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
033:         * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
034:         * IN NO EVENT SHALL COLLAB.NET OR ITS CONTRIBUTORS BE LIABLE FOR ANY
035:         * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
036:         * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
037:         * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
038:         * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
039:         * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
040:         * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
041:         * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
042:         *
043:         * ====================================================================
044:         * 
045:         * This software consists of voluntary contributions made by many
046:         * individuals on behalf of Collab.Net.
047:         */
048:
049:        import java.io.Serializable;
050:
051:        import org.apache.commons.lang.ObjectUtils;
052:        import org.apache.fulcrum.pool.Recyclable;
053:        import org.apache.log4j.Logger;
054:
055:        /** 
056:         *
057:         *
058:         * @author <a href="mailto:jmcnally@collab.net">John McNally</a>
059:         * @version $Id: ScarabCacheKey.java 9255 2004-11-14 21:07:04Z dep4b $
060:         */
061:        public class ScarabCacheKey implements  Serializable, Recyclable {
062:            private static final Logger LOG = Logger
063:                    .getLogger("org.apache.torque");
064:
065:            private int n;
066:            private Serializable instanceOrClass;
067:            private String method;
068:            private Serializable arg1;
069:            private Serializable arg2;
070:            private Serializable arg3;
071:            private Serializable[] moreThanThree;
072:
073:            /**
074:             * The disposed flag.
075:             */
076:            private boolean disposed;
077:
078:            public ScarabCacheKey() {
079:                recycle();
080:            }
081:
082:            public ScarabCacheKey(Serializable instanceOrClass, String method) {
083:                init(instanceOrClass, method);
084:            }
085:
086:            public ScarabCacheKey(Serializable instanceOrClass, String method,
087:                    Serializable arg1) {
088:                init(instanceOrClass, method, arg1);
089:            }
090:
091:            public ScarabCacheKey(Serializable instanceOrClass, String method,
092:                    Serializable arg1, Serializable arg2) {
093:                init(instanceOrClass, method, arg1, arg2);
094:            }
095:
096:            public ScarabCacheKey(Serializable instanceOrClass, String method,
097:                    Serializable arg1, Serializable arg2, Serializable arg3) {
098:                init(instanceOrClass, method, arg1, arg2, arg3);
099:            }
100:
101:            public ScarabCacheKey(Serializable[] moreThanThree) {
102:                init(moreThanThree);
103:            }
104:
105:            /**
106:             * Initialize key for method with no arguments.
107:             *
108:             * @param instanceOrClass the Object on which the method is invoked.  if 
109:             * the method is static, a String representing the class name is used.
110:             * @param method the method name
111:             */
112:            public void init(Serializable instanceOrClass, String method) {
113:                n = 0;
114:                this .instanceOrClass = instanceOrClass;
115:                this .method = method;
116:            }
117:
118:            /**
119:             * Initialize key for method with one argument.
120:             *
121:             * @param instanceOrClass the Object on which the method is invoked.  if 
122:             * the method is static, a String representing the class name is used.
123:             * @param method the method name
124:             * @param arg1 first method arg, may be null
125:             */
126:            public void init(Serializable instanceOrClass, String method,
127:                    Serializable arg1) {
128:                n = 1;
129:                this .instanceOrClass = instanceOrClass;
130:                this .method = method;
131:                this .arg1 = arg1;
132:            }
133:
134:            /**
135:             * Initialize key for method with two arguments.
136:             *
137:             * @param instanceOrClass the Object on which the method is invoked.  if 
138:             * the method is static, a String representing the class name is used.
139:             * @param method the method name
140:             * @param arg1 first method arg, may be null
141:             * @param arg2 second method arg, may be null
142:             */
143:            public void init(Serializable instanceOrClass, String method,
144:                    Serializable arg1, Serializable arg2) {
145:                n = 2;
146:                this .instanceOrClass = instanceOrClass;
147:                this .method = method;
148:                this .arg1 = arg1;
149:                this .arg2 = arg2;
150:            }
151:
152:            /**
153:             * Initialize key for method with two arguments.
154:             *
155:             * @param instanceOrClass the Object on which the method is invoked.  if 
156:             * the method is static, a String representing the class name is used.
157:             * @param method the method name
158:             * @param arg1 first method arg, may be null
159:             * @param arg2 second method arg, may be null
160:             */
161:            public void init(Serializable instanceOrClass, String method,
162:                    Serializable arg1, Serializable arg2, Serializable arg3) {
163:                n = 3;
164:                this .instanceOrClass = instanceOrClass;
165:                this .method = method;
166:                this .arg1 = arg1;
167:                this .arg2 = arg2;
168:                this .arg3 = arg3;
169:            }
170:
171:            /**
172:             * Initialize key for method with more than two arguments.
173:             *
174:             * @param keys <code>Serializable[]</code> where
175:             * [0]=>the Object on which the method is invoked
176:             * if the method is static, a String representing the class name is used.
177:             * [1]=>the method name
178:             * [n] where n>1 are the method arguments
179:             */
180:            public void init(Serializable[] keys) {
181:                n = keys.length - 2;
182:                this .instanceOrClass = keys[0];
183:                this .method = (String) keys[1];
184:                if (n > 0) {
185:                    this .arg1 = keys[2];
186:                    if (n > 1) {
187:                        this .arg2 = keys[3];
188:                        if (n > 2) {
189:                            // TODO: this is a bug, but it matches a bug in torque
190:                            // and we use this cache as an alternative to the jcs
191:                            // cache in some cases.  Need to update it once we have
192:                            // time to upgrade torque.
193:                            //this.arg3 = keys[4];
194:                            this .arg2 = keys[4];
195:                            if (n > 3) {
196:                                this .moreThanThree = keys;
197:                            }
198:                        }
199:                    }
200:                }
201:            }
202:
203:            public boolean equals(Object obj) {
204:                boolean equal = false;
205:                if (obj instanceof  ScarabCacheKey) {
206:                    ScarabCacheKey sck = (ScarabCacheKey) obj;
207:                    equal = sck.n == n;
208:                    equal &= ObjectUtils.equals(sck.instanceOrClass,
209:                            instanceOrClass);
210:                    equal &= ObjectUtils.equals(sck.method, method);
211:                    if (n > 0) {
212:                        equal &= ObjectUtils.equals(sck.arg1, arg1);
213:                        if (n > 1) {
214:                            equal &= ObjectUtils.equals(sck.arg2, arg2);
215:                            if (n > 2) {
216:                                equal &= ObjectUtils.equals(sck.arg3, arg3);
217:                                if (n > 3) {
218:                                    for (int i = 5; i < n + 2; i++) {
219:                                        equal &= ObjectUtils.equals(
220:                                                sck.moreThanThree[i],
221:                                                moreThanThree[i]);
222:                                    }
223:                                }
224:                            }
225:                        }
226:                    }
227:
228:                    if (equal) {
229:                        LOG.debug("Saved db hit on " + instanceOrClass + "::"
230:                                + method + ". YAY!");
231:                    }
232:                }
233:                return equal;
234:            }
235:
236:            public int hashCode() {
237:                int h = instanceOrClass.hashCode();
238:                h += method.hashCode();
239:                if (n > 0) {
240:                    h += (arg1 == null ? 0 : arg1.hashCode());
241:                    if (n > 1) {
242:                        h += (arg2 == null ? 0 : arg2.hashCode());
243:                        if (n > 2) {
244:                            h += (arg3 == null ? 0 : arg3.hashCode());
245:                            if (n > 3) {
246:                                for (int i = 5; i < n + 2; i++) {
247:                                    h += (moreThanThree[i] == null ? 0
248:                                            : moreThanThree[i].hashCode());
249:                                }
250:                            }
251:                        }
252:                    }
253:                }
254:                return h;
255:            }
256:
257:            // ****************** Recyclable implementation ************************
258:            /**
259:             * Recycles the object by removing its disposed flag.
260:             */
261:            public void recycle() {
262:                disposed = false;
263:            }
264:
265:            /**
266:             * Disposes the object after use. The method is called when the
267:             * object is returned to its pool.  The dispose method must call
268:             * its super.
269:             */
270:            public void dispose() {
271:                disposed = true;
272:                instanceOrClass = null;
273:                method = null;
274:                arg1 = null;
275:                arg2 = null;
276:                arg3 = null;
277:                moreThanThree = null;
278:            }
279:
280:            /**
281:             * Checks whether the object is disposed.
282:             *
283:             * @return true, if the object is disposed.
284:             */
285:            public boolean isDisposed() {
286:                return disposed;
287:            }
288:        }
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