initial commit

timer/com/vladium/utils/timing/TimerFactory.java

@@ -0,0 +1,74 @@
+
+package com.vladium.utils.timing;
+
+// ----------------------------------------------------------------------------
+/**
+ * This non-instantiable non-extendible class acts as a Factory for {@link ITimer}
+ * implementations.
+ * 
+ * @author (C) <a href="mailto:vroubtsov@illinoisalumni.org">Vlad Roubtsov</a>, 2002
+ */
+public abstract class TimerFactory
+{
+    // public: ................................................................
+
+	private static final String HRTIMER_LIB = "hrtlib";
+
+    /**
+     * Creates a new instance of {@link ITimer} which is returned in 'ready'
+     * state. If the JNI-based/high-resolution implementation is not available
+     * this will return an instance of <code>JavaSystemTimer</code>, so this
+     * method is guaranteed not to fail.
+     * 
+     * @return ITimer a new timer instance in 'ready' state [never null] 
+     */
+	
+	public static void initialize(String path) {
+
+		UnsatisfiedLinkError exception = null;
+		
+		try {
+			System.loadLibrary (HRTIMER_LIB);
+		} catch (UnsatisfiedLinkError e) {
+			if(path != null) {
+				try {
+					System.load(path);
+				} catch (UnsatisfiedLinkError ex) {
+					exception = ex;
+				}
+			} else {
+				exception = e;
+			}
+		}
+
+		if(exception != null) {
+			System.out.println ("native lib '" + HRTIMER_LIB
+					+ "' not found in 'java.library.path': "
+					+ System.getProperty ("java.library.path")
+					+path==null?"":(" or in "+path));
+
+			throw exception; // re-throw
+		}
+	}
+	
+    public static ITimer newTimer ()
+    {
+//        try
+//        {
+            return new HRTimer ();
+//        }
+//        catch (Throwable t)
+//        {
+//            return new JavaSystemTimer ();
+//        }
+    }
+    
+    // protected: .............................................................
+
+    // package: ...............................................................
+    
+    // private: ...............................................................
+    
+    private TimerFactory () {} // prevent subclassing
+    
+} // end of class