Added Semaphore test/example

#39

Author: nmcl

src/test/java/org/javasim/tests/SemaphoreUnitTest.java

@@ -0,0 +1,82 @@
+/*
+ * Copyright 1990-2008, Mark Little, University of Newcastle upon Tyne
+ * and others contributors as indicated 
+ * by the @authors tag. All rights reserved. 
+ * See the copyright.txt in the distribution for a
+ * full listing of individual contributors. 
+ * This copyrighted material is made available to anyone wishing to use,
+ * modify, copy, or redistribute it subject to the terms and conditions
+ * of the GNU Lesser General Public License, v. 2.1.
+ * This program is distributed in the hope that it will be useful, but WITHOUT A 
+ * 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,
+ * v.2.1 along with this distribution; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, 
+ * MA  02110-1301, USA.
+ * 
+ * (C) 1990-2008,
+ */
+
+package org.javasim.tests;
+
+import org.javasim.RestartException;
+import org.javasim.Semaphore;
+import org.javasim.SimulationEntity;
+import org.javasim.streams.ExponentialStream;
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+class DummyEntity extends SimulationEntity
+{
+    public DummyEntity (double mean)
+    {
+        InterArrivalTime = new ExponentialStream(mean);
+    }
+
+    public void run ()
+    {
+        try
+        {
+            hold(InterArrivalTime.getNumber());
+        }
+        catch (final Exception ex)
+        {
+        }
+    }
+
+    private ExponentialStream InterArrivalTime;
+}
+
+
+public class SemaphoreUnitTest
+{
+    @Test
+    public void test () throws Exception
+    {
+	Semaphore sem = new Semaphore(2);
+	DummyEntity e1 = new DummyEntity(10);
+	DummyEntity e2 = new DummyEntity(20);
+	DummyEntity e3 = new DummyEntity(30);
+
+	assertTrue(sem.numberWaiting() == 0);
+
+	Semaphore.Outcome result = sem.get(e1);
+
+	assertTrue(result == Semaphore.Outcome.DONE);
+
+	result = sem.get(e2);
+
+	assertTrue(result == Semaphore.Outcome.DONE);
+
+	result = sem.tryGet(e3);
+
+	assertTrue(result == Semaphore.Outcome.WOULD_BLOCK);
+
+	result = sem.get(e3);
+
+	assertTrue(result == Semaphore.Outcome.DONE);
+	assertTrue(sem.numberWaiting() == 1);
+    }
+}