Guide to Guava | common.util.concurrent (#1528)

Code and Tests for common.util.concurrent package

guava21/src/test/java/MonitorUnitTests.java

@@ -0,0 +1,61 @@
+import com.google.common.util.concurrent.Monitor;
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.util.concurrent.atomic.AtomicBoolean;
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.concurrent.atomic.AtomicReference;
+
+import static com.google.common.util.concurrent.Uninterruptibles.joinUninterruptibly;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNull;
+
+public class MonitorUnitTests {
+
+    @Test
+    public void whenGaurdConditionIsTrue_IsSuccessful() {
+        Monitor monitor = new Monitor();
+        boolean enteredInCriticalSection = false;
+
+        Monitor.Guard gaurdCondition = monitor.newGuard(this::returnTrue);
+
+        if(monitor.enterIf(gaurdCondition)){
+            try{
+                System.out.println("Entered in critical section");
+                enteredInCriticalSection = true;
+            }finally {
+                monitor.leave();
+            }
+        }
+
+        Assert.assertTrue(enteredInCriticalSection);
+
+    }
+
+    @Test
+    public void whenGaurdConditionIsFalse_IsSuccessful() {
+        Monitor monitor = new Monitor();
+        boolean enteredInCriticalSection = false;
+
+        Monitor.Guard gaurdCondition = monitor.newGuard(this::returnFalse);
+
+        if(monitor.enterIf(gaurdCondition)){
+            try{
+                System.out.println("Entered in critical section");
+                enteredInCriticalSection = true;
+            }finally {
+                monitor.leave();
+            }
+        }
+
+        Assert.assertFalse(enteredInCriticalSection);
+    }
+
+    private boolean returnTrue(){
+        return true;
+    }
+
+    private boolean returnFalse(){
+        return false;
+    }
+}