Source Code Cross Referenced for FileMutex.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.io.DataInputStream;
030:        import java.io.DataOutputStream;
031:        import java.io.File;
032:        import java.io.FileInputStream;
033:        import java.io.FileOutputStream;
034:        import java.io.IOException;
035:        import java.text.DecimalFormat;
036:        import java.text.SimpleDateFormat;
037:        import java.util.Date;
038:
039:        /**
040:         * A file lock.
041:         */
042:        public class FileMutex {
043:            private static final SimpleDateFormat uniqueNameFormat;
044:            static {
045:                uniqueNameFormat = new SimpleDateFormat("yyyyMMddHHmmssSSS");
046:            }
047:
048:            private File uniqueFile;
049:            private File commonFile;
050:            private long timeout;
051:
052:            public FileMutex(File directory, String commonName, long timeout) {
053:                this .timeout = timeout;
054:                commonFile = new File(directory, commonName);
055:                uniqueFile = new File(directory, uniqueNameFormat
056:                        .format(new Date()));
057:            }
058:
059:            public void lock() throws IOException {
060:                long endTime = System.currentTimeMillis() + timeout;
061:                new FileOutputStream(uniqueFile).close(); // No content needed
062:                while (!uniqueFile.renameTo(commonFile)) {
063:                    if (System.currentTimeMillis() > endTime) {
064:                        unlock(); // Unlock the mutex for the
065:                        // (apparently dead) other instance
066:                        continue; // Rename should now work
067:                    }
068:                    try {
069:                        Thread.sleep(5000); // Wait for the other instance to
070:                        // unlock
071:                    } catch (InterruptedException ie) {
072:                    }
073:                }
074:            }
075:
076:            public void unlock() throws IOException {
077:                commonFile.delete();
078:            }
079:
080:            public static void main(String[] args) {
081:                String TMP = "/tmp";
082:                String SEQ = TMP + "/seq";
083:                String PREFIX = TMP + "/";
084:                String COMMON = "filemutexlock";
085:                String SUFFIX = args[0];
086:                DecimalFormat format = new DecimalFormat("00000");
087:                FileMutex fm = new FileMutex(new File(TMP), COMMON, 30000L);
088:                try {
089:                    for (int i = 0; i < 1000; i++) {
090:                        fm.lock();
091:                        int seq;
092:                        try {
093:                            DataInputStream r = new DataInputStream(
094:                                    new FileInputStream(SEQ));
095:                            try {
096:                                seq = r.readInt();
097:                            } finally {
098:                                r.close();
099:                            }
100:                        } catch (IOException ioe) {
101:                            seq = 0;
102:                        }
103:                        String fileName = PREFIX + format.format(seq) + SUFFIX;
104:                        new FileOutputStream(fileName).close();
105:                        DataOutputStream o = new DataOutputStream(
106:                                new FileOutputStream(SEQ));
107:                        seq++;
108:                        o.writeInt(seq);
109:                        o.close();
110:                        fm.unlock();
111:                        Thread.sleep(100);
112:                    }
113:                } catch (Exception e) {
114:                    e.printStackTrace();
115:                }
116:            }
117:        }
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