From 410fcb6242d1dcf98d6f4eb94f9409d656fc0caa Mon Sep 17 00:00:00 2001
From: Sven Gothel <sgothel@jausoft.com>
Date: Sat, 11 Jun 2011 01:56:29 +0200
Subject: Complete relocation of SingletonInstance.java from JOGL
---
.../common/util/locks/SingletonInstance.java | 164 +++++++++++++++++++++
1 file changed, 164 insertions(+)
create mode 100644 src/java/com/jogamp/common/util/locks/SingletonInstance.java
(limited to 'src/java/com/jogamp')
diff --git a/src/java/com/jogamp/common/util/locks/SingletonInstance.java b/src/java/com/jogamp/common/util/locks/SingletonInstance.java
new file mode 100644
index 0000000..f69641f
--- /dev/null
+++ b/src/java/com/jogamp/common/util/locks/SingletonInstance.java
@@ -0,0 +1,164 @@
+/**
+ * Copyright 2010 JogAmp Community. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification, are
+ * permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this list of
+ * conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice, this list
+ * of conditions and the following disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY JogAmp Community ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JogAmp Community OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * The views and conclusions contained in the software and documentation are those of the
+ * authors and should not be interpreted as representing official policies, either expressed
+ * or implied, of JogAmp Community.
+ */
+
+package com.jogamp.common.util.locks;
+
+import java.io.File;
+import java.io.IOException;
+import java.io.RandomAccessFile;
+import java.nio.channels.FileLock;
+import java.util.Date;
+
+public class SingletonInstance {
+
+ static final boolean DEBUG = true;
+ static final String temp_file_path;
+
+ static {
+ String s = null;
+ try {
+ File tmpFile = File.createTempFile("TEST", "tst");
+ String absTmpFile = tmpFile.getCanonicalPath();
+ tmpFile.delete();
+ s = absTmpFile.substring(0, absTmpFile.lastIndexOf(File.separator));
+ } catch (IOException ex) {
+ ex.printStackTrace();
+ }
+ temp_file_path = s;
+ }
+
+ public static String getCanonicalTempPath() {
+ return temp_file_path;
+ }
+
+ public static String getCanonicalTempLockFilePath(String basename) {
+ return getCanonicalTempPath() + File.separator + basename;
+ }
+
+ public SingletonInstance(String name, String lockFileBasename) {
+ this.name = name;
+ this.file = new File ( getCanonicalTempLockFilePath ( lockFileBasename ) );
+ setupFileCleanup();
+ }
+
+ public SingletonInstance(String name, File lockFile) {
+ this.name = name;
+ this.file = lockFile ;
+ setupFileCleanup();
+ }
+
+ public String getName() { return name; }
+
+ void setupFileCleanup() {
+ file.deleteOnExit();
+ Runtime.getRuntime().addShutdownHook(new Thread() {
+ public void run() {
+ unlock();
+ }
+ });
+ }
+
+ public synchronized void lock(long timeout_ms, long poll_ms) {
+ long i=0;
+ try {
+ do {
+ if(tryLock()) {
+ return;
+ }
+ if(DEBUG && 0==i) {
+ System.err.println("SLOCK "+System.currentTimeMillis()+" ??? "+name+" - Wait for lock " + file);
+ }
+ i++;
+ Thread.sleep(poll_ms);
+ } while ( i < timeout_ms / poll_ms ) ;
+ } catch ( InterruptedException ie ) {
+ throw new RuntimeException(ie);
+ }
+ throw new RuntimeException("SLOCK "+System.currentTimeMillis()+" EEE "+name+" - couldn't get lock within "+timeout_ms+"ms");
+ }
+
+ public synchronized boolean tryLock() {
+ try {
+ randomAccessFile = new RandomAccessFile(file, "rw");
+ fileLock = randomAccessFile.getChannel().tryLock();
+
+ if (fileLock != null) {
+ locked = true;
+ if(DEBUG) {
+ System.err.println("SLOCK "+System.currentTimeMillis()+" +++ "+name+" - Locked " + file);
+ }
+ return true;
+ }
+ } catch (Exception e) {
+ System.err.println("SLOCK "+System.currentTimeMillis()+" EEE "+name+" - Unable to create and/or lock file: " + file);
+ e.printStackTrace();
+ }
+ return false;
+ }
+
+ public synchronized boolean unlock() {
+ try {
+ if(null != fileLock) {
+ if(locked) {
+ fileLock.release();
+ if(DEBUG) {
+ System.err.println("SLOCK "+System.currentTimeMillis()+" --- "+name+" - Unlocked " + file);
+ }
+ }
+ fileLock = null;
+ }
+ if(null != randomAccessFile) {
+ randomAccessFile.close();
+ randomAccessFile = null;
+ }
+ if(null != file) {
+ file.delete();
+ file = null;
+ }
+ return true;
+ } catch (Exception e) {
+ System.err.println("SLOCK "+System.currentTimeMillis()+" EEE "+name+" - Unable to remove lock file: " + file);
+ e.printStackTrace();
+ } finally {
+ fileLock = null;
+ randomAccessFile = null;
+ locked = false;
+ }
+ return false;
+ }
+
+ public synchronized boolean isLocked() {
+ return locked;
+ }
+
+ String name;
+ File file = null;
+ RandomAccessFile randomAccessFile = null;
+ FileLock fileLock = null;
+ boolean locked = false;
+}
--
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