Initial import from SVN

1 files changed, 108 insertions, 0 deletions

diff --git a/projects/net.wotonomy.foundation/src/main/java/net/wotonomy/foundation/NSLock.java b/projects/net.wotonomy.foundation/src/main/java/net/wotonomy/foundation/NSLock.java
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index 0000000..e6a5147
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+++ b/projects/net.wotonomy.foundation/src/main/java/net/wotonomy/foundation/NSLock.java
@@ -0,0 +1,108 @@
+/*
+Wotonomy: OpenStep design patterns for pure Java applications.
+Copyright (C) 2002 Israfil consulting Services Corporation
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Lesser General Public
+License as published by the Free Software Foundation; either
+version 2.1 of the License, or (at your option) any later version.
+
+This library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public
+License along with this library; if not, see http://www.gnu.org
+
+$Id: NSLock.java 893 2006-02-16 13:22:23Z cgruber $
+
+*/
+
+package net.wotonomy.foundation;
+
+import EDU.oswego.cs.dl.util.concurrent.Mutex;
+
+/**
+* A simple mutually-exclusive lock. Currently an API-compliance 
+* subclass of an external Mutex class, conforming to the API and 
+* behavior of com.webobjects.foundation.NSLock.  This class implements
+* the NSLocking protocol (interface), and is implemented using 
+* Doug Lea's concurrent programming package.  
+*
+* @author cgruber@israfil.net
+* @author $Author: cgruber $
+* @version $Revision: 893 $
+* 
+*/
+
+public class NSLock extends Mutex implements NSLocking {
+
+
+    public NSLock() {
+    }
+
+    public synchronized void lock() {
+        try {
+            acquire();
+        } catch (InterruptedException interruptedexception) {
+            notify();
+        }
+    }
+
+    public synchronized void unlock() {
+        release();
+    }
+
+    public synchronized boolean tryLock() {
+        return tryLock(0);
+    }
+
+    public synchronized boolean tryLock(long l) {
+        try {
+            return attempt(l);
+        } catch (InterruptedException interruptedexception) {
+            notify();
+            return false;
+        }
+    }
+
+    public boolean tryLock(NSTimestamp nstimestamp) {
+        return tryLock(nstimestamp.getTime() - System.currentTimeMillis());
+    }
+
+    public String toString() {
+		return getClass().getName() + " <" + (inuse_ ? "Locked" : "Unlocked") + ">";
+    }
+
+    public synchronized boolean isLocked() {
+		return inuse_;
+    }
+
+}
+
+/*
+ * $Log$
+ * Revision 1.2  2006/02/16 13:15:00  cgruber
+ * Check in all sources in eclipse-friendly maven-enabled packages.
+ *
+ * Revision 1.1  2002/07/14 21:56:16  mpowers
+ * Contributions from cgruber.
+ *
+ * Revision 1.4  2002/06/25 19:03:02  cgruber
+ * Internal documentation fixes.
+ *
+ * Revision 1.3  2002/06/25 18:52:56  cgruber
+ * Fix javadocs that resulted from bad cut-and-paste of the 
+ * boilerplate.
+ *
+ * Revision 1.2  2002/06/25 17:45:52  cgruber
+ * Add implementation of NSLock using Doug Lea's concurrent 
+ * programming APIs.
+ *
+ * Revision 1.1  2002/06/25 07:52:57  cgruber
+ * Add quite a few abstract classes, interfaces, and classes.  All 
+ * API consistent with WebObjects, but with no implementation, nor 
+ * any private or package access members from the original.
+ *
+ */