Source Code Cross Referenced for CacheDirChannelLogger.java in  » Test-Coverage » GroboUtils » net » sourceforge » groboutils » codecoverage » v2 » logger » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Test Coverage » GroboUtils » net.sourceforge.groboutils.codecoverage.v2.logger 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * @(#)CacheDirChannelLogger.java
003:         *
004:         * Copyright (C) 2003-2004 Matt Albrecht
005:         * groboclown@users.sourceforge.net
006:         * http://groboutils.sourceforge.net
007:         *
008:         *  Permission is hereby granted, free of charge, to any person obtaining a
009:         *  copy of this software and associated documentation files (the "Software"),
010:         *  to deal in the Software without restriction, including without limitation
011:         *  the rights to use, copy, modify, merge, publish, distribute, sublicense,
012:         *  and/or sell copies of the Software, and to permit persons to whom the
013:         *  Software is furnished to do so, subject to the following conditions:
014:         *
015:         *  The above copyright notice and this permission notice shall be included in
016:         *  all copies or substantial portions of the Software.
017:         *
018:         *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
019:         *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
020:         *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
021:         *  THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
022:         *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
023:         *  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
024:         *  DEALINGS IN THE SOFTWARE.
025:         */
026:
027:        package net.sourceforge.groboutils.codecoverage.v2.logger;
028:
029:        import net.sourceforge.groboutils.util.datastruct.v1.HashCache;
030:
031:        import java.io.BufferedWriter;
032:        import java.io.File;
033:        import java.io.FileWriter;
034:        import java.io.IOException;
035:        import java.io.Writer;
036:
037:        /**
038:         * This is the same as the DirectoryChannelLogger, except that the open
039:         * files are cached for access.
040:         * <P>
041:         * Besides some other issues with this (see open bugs), it can cause
042:         * issues if multiple loggers are trying to access the same file.  This
043:         * could happen if the CoverageLogger class is loaded by different class
044:         * loaders; as a result, multiple CoverageLogger instances will be created,
045:         * allowing for multiple channel loggers to write to the same area.
046:         *
047:         * @author    Matt Albrecht <a href="mailto:groboclown@users.sourceforge.net">groboclown@users.sourceforge.net</a>
048:         * @version   $Date: 2004/07/07 09:39:10 $
049:         * @since     May 9, 2003
050:         */
051:        public class CacheDirChannelLogger extends DirectoryChannelLogger
052:                implements  Runnable, HashCache.ObjectManager {
053:            private final HashCache openedFiles;
054:
055:            public CacheDirChannelLogger(File baseDir, int cacheSize) {
056:                super (baseDir);
057:                if (baseDir != null) {
058:                    // even though the logic in the factory shouldn't allow this,
059:                    // it apparently can happen.
060:                    // See bug 923349
061:                    if (cacheSize <= 0) {
062:                        cacheSize = CacheDirChannelLoggerFactory.DEFAULT_CACHESIZE;
063:                    }
064:                    this .openedFiles = new HashCache(this , cacheSize);
065:                    addShutdownHook();
066:                } else {
067:                    this .openedFiles = null;
068:                }
069:            }
070:
071:            /**
072:             * Records a coverage of a marked bytecode instruction.  This method should
073:             * never throw an exception.
074:             *
075:             * @param classSignature a signature of the class file being covered.
076:             *        this signature includes the fully-qualified name of the class,
077:             *        along with a checksum to uniquely identify it.
078:             * @param methodIndex index for a method within the class.  The meta-data
079:             *        store will know how to translate the index to a method signature.
080:             * @param markIndex the index of the bytecode instruction mark for this
081:             *        particular channel.
082:             */
083:            public void cover(String classSignature, short methodIndex,
084:                    short markIndex) {
085:                if (this .baseDir != null) {
086:                    File f = getClassFile(this .baseDir, classSignature);
087:                    Writer w = null;
088:                    try {
089:                        char[] out = createCoverString(methodIndex, markIndex);
090:                        synchronized (this ) {
091:                            w = (Writer) this .openedFiles.get(f);
092:                            if (w != null) {
093:                                w.write(out);
094:                            }
095:                        }
096:                    } catch (IOException ioe) {
097:                        // gasp!!!!
098:                        ioe.printStackTrace();
099:
100:                        // prevent these errors from occuring again
101:                        this .baseDir = null;
102:                    }
103:                }
104:            }
105:
106:            /**
107:             * Called when the shutdown hook is called.
108:             */
109:            public void run() {
110:                synchronized (this ) {
111:                    this .openedFiles.clear();
112:                }
113:            }
114:
115:            /**
116:             * Called by the HashCache
117:             */
118:            public Object createObject(Object key) {
119:                File f = (File) key;
120:                try {
121:                    // bug 907800
122:                    BufferedWriter bw = new BufferedWriter(new FileWriter(f
123:                            .toString(), true));
124:                    return bw;
125:                } catch (IOException ioe) {
126:                    // gasp!!!!
127:                    ioe.printStackTrace();
128:
129:                    // prevent these errors from occuring again
130:                    this .baseDir = null;
131:
132:                    // we have to return something...
133:                    return null;
134:                }
135:            }
136:
137:            /**
138:             * Called by HashCache when the given object is being removed from the
139:             * cache.
140:             *
141:             * @param key the key associated with the object.
142:             * @param obj the object being cleaned up.
143:             */
144:            public void cleanUpObject(Object key, Object obj) {
145:                if (obj != null) {
146:                    Writer w = (Writer) obj;
147:                    try {
148:                        w.flush();
149:                        w.close();
150:                    } catch (IOException ioe) {
151:                        ioe.printStackTrace();
152:                    }
153:                }
154:            }
155:
156:            protected void finalize() throws Throwable {
157:                // our cleanup method is the "run" method.  Of course!
158:                run();
159:
160:                super .finalize();
161:            }
162:
163:            protected void addShutdownHook() {
164:                Class c = Runtime.class;
165:                try {
166:                    java.lang.reflect.Method m = c.getMethod("addShutdownHook",
167:                            new Class[] { Thread.class });
168:                    Thread t = new Thread(this , this .getClass().getName()
169:                            + " shutdown hook");
170:                    m.invoke(Runtime.getRuntime(), new Object[] { t });
171:                } catch (Exception ex) {
172:                    // prolly JDK 1.3 not supported.
173:                    System.err
174:                            .println(this .getClass().getName()
175:                                    + " should only be run in a JDK 1.3 compatible JVM.");
176:                    ex.printStackTrace();
177:                }
178:            }
179:        }
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