Source Code Cross Referenced for kelondroLock.java in  » Search-Engine » yacy » de » anomic » kelondro » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Search Engine » yacy » de.anomic.kelondro 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        // kelondroLock.java
002:        // -----------------------
003:        // part of YaCy
004:        // (C) by Michael Peter Christen; mc@anomic.de
005:        // first published on http://www.anomic.de
006:        // Frankfurt, Germany, 2005
007:        // Created 08.12.2005
008:        //
009:        // This program is free software; you can redistribute it and/or modify
010:        // it under the terms of the GNU General Public License as published by
011:        // the Free Software Foundation; either version 2 of the License, or
012:        // (at your option) any later version.
013:        //
014:        // This program is distributed in the hope that it will be useful,
015:        // but WITHOUT ANY WARRANTY; without even the implied warranty of
016:        // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
017:        // GNU General Public License for more details.
018:        //
019:        // You should have received a copy of the GNU General Public License
020:        // along with this program; if not, write to the Free Software
021:        // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
022:        //
023:        // Using this software in any meaning (reading, learning, copying, compiling,
024:        // running) means that you agree that the Author(s) is (are) not responsible
025:        // for cost, loss of data or any harm that may be caused directly or indirectly
026:        // by usage of this softare or this documentation. The usage of this software
027:        // is on your own risk. The installation and usage (starting/running) of this
028:        // software may allow other people or application to access your computer and
029:        // any attached devices and is highly dependent on the configuration of the
030:        // software which must be done by the user of the software; the author(s) is
031:        // (are) also not responsible for proper configuration and usage of the
032:        // software, even if provoked by documentation provided together with
033:        // the software.
034:        //
035:        // Any changes to this file according to the GPL as documented in the file
036:        // gpl.txt aside this file in the shipment you received can be done to the
037:        // lines that follows this copyright notice here, but changes must not be
038:        // done inside the copyright notive above. A re-distribution must contain
039:        // the intact and unchanged copyright notice.
040:        // Contributions and changes to the program code must be marked as such.
041:
042:        package de.anomic.kelondro;
043:
044:        public class kelondroLock {
045:
046:            private boolean lock;
047:            private long releaseTime;
048:
049:            public kelondroLock() {
050:                lock = false;
051:                releaseTime = 0;
052:            }
053:
054:            public synchronized void apply() {
055:                // this applies a lock to this objekt
056:                // if the lock is already applied
057:                // this object waits until it is released and applies it then again
058:                // before it returns
059:                apply(-1);
060:            }
061:
062:            public synchronized void apply(long millis) {
063:                // sets a lock that is valid for a specific time
064:                // if the time is over, the lock is released automatically
065:                if (locked()) {
066:                    do {
067:                        try {
068:                            wait(100);
069:                        } catch (InterruptedException e) {
070:                        } catch (Exception e) {
071:                            e.printStackTrace();
072:                        }
073:                    } while (locked());
074:                }
075:                lock = true;
076:                releaseTime = (millis < 0) ? Long.MAX_VALUE : System
077:                        .currentTimeMillis()
078:                        + millis;
079:            }
080:
081:            public synchronized boolean stay(long waitMillis, long lockMillis) {
082:                // this tries to apply a lock, but does not block infinitely until
083:                // the lock is released. If after the given time the lock is not released
084:                // the method returns with false and no more lock is applied
085:                // if the lock was applied successfully, it returns with true
086:                if (locked()) {
087:                    try {
088:                        wait(waitMillis);
089:                    } catch (InterruptedException e) {
090:                    } catch (Exception e) {
091:                        e.printStackTrace();
092:                    }
093:                    if (locked())
094:                        return false;
095:                }
096:                lock = true;
097:                releaseTime = (lockMillis < 0) ? Long.MAX_VALUE : System
098:                        .currentTimeMillis()
099:                        + lockMillis;
100:                return true;
101:            }
102:
103:            public synchronized void release() {
104:                // this must be called to releas the lock to the object
105:                // if it is not released, possibly all other tasks are blocked
106:                if (locked()) {
107:                    lock = false;
108:                    releaseTime = 0;
109:                    notify();
110:                }
111:            }
112:
113:            public synchronized boolean locked() {
114:                return lock && (System.currentTimeMillis() < releaseTime);
115:            }
116:        }
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