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[utils] / support / general / src / test / java / org / wamblee / observer / ObservableTest.java

diff --git a/support/general/src/test/java/org/wamblee/observer/ObservableTest.java b/support/general/src/test/java/org/wamblee/observer/ObservableTest.java
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+/*
+ * Copyright 2005 the original author or authors.
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.wamblee.observer;
+
+import static org.easymock.EasyMock.createControl;
+import static org.easymock.EasyMock.createMock;
+import static org.easymock.EasyMock.createStrictMock;
+import static org.easymock.EasyMock.replay;
+import static org.easymock.EasyMock.verify;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import junit.framework.TestCase;
+
+import org.easymock.IMocksControl;
+
+/**
+ * Test of the observer pattern implementation.
+ * 
+ * @author Erik Brakkee
+ */
+public class ObservableTest extends TestCase {
+
+       private static final int SUBSCRIBER_COUNT = 100;
+
+       private static final String UPDATE = "send";
+
+       private Integer _observed;
+       private Observable<Integer, String> _observable;
+
+       /*
+        * (non-Javadoc)
+        * 
+        * @see junit.framework.TestCase#setUp()
+        */
+       @Override
+       protected void setUp() throws Exception {
+               super.setUp();
+               _observed = new Integer(1);
+               _observable = new Observable<Integer, String>(_observed,
+                               new DefaultObserverNotifier());
+       }
+
+       /**
+        * Tests subscription and notification of one subscriber.
+        */
+       public void testOneObserver() {
+               final Observer mockObserver = createStrictMock(Observer.class);
+               long subscription = _observable.subscribe(mockObserver);
+
+               assertEquals(1, _observable.getObserverCount());
+
+               final String message = "hallo";
+               mockObserver.send(_observed, message);
+               replay(mockObserver);
+
+               _observable.send(message);
+               verify(mockObserver);
+
+               _observable.unsubscribe(subscription);
+               assertEquals(0, _observable.getObserverCount());
+
+               _observable.send(message);
+
+       }
+
+       /**
+        * Subscribes many susbcribers and sends notifications to subscribers.
+        * Verifies that unique subscription number are returned. Also verifies that
+        * the correct subscribers are notfied.
+        */
+       public void testManySubscribers() {
+               final int nsubscribers = SUBSCRIBER_COUNT;
+               final Observer[] mocks = new Observer[nsubscribers];
+
+               IMocksControl control = createControl();
+
+               List<Long> subscriptions = new ArrayList<Long>();
+               for (int i = 0; i < nsubscribers; i++) {
+                       mocks[i] = control.createMock("mock" + i, Observer.class);
+                       long subscription = _observable.subscribe(mocks[i]);
+                       assertTrue(subscriptions.add(subscription));
+               }
+
+               assertEquals(nsubscribers, _observable.getObserverCount());
+
+               final String message = "hallo";
+
+               for (int i = 0; i < nsubscribers; i++) {
+                       mocks[i].send(_observed, message);
+               }
+               control.replay();
+
+               _observable.send(message);
+               control.verify();
+
+               for (int i = nsubscribers / 2; i < nsubscribers; i++) {
+                       _observable.unsubscribe(subscriptions.get(i));
+               }
+               assertEquals(nsubscribers - (nsubscribers - nsubscribers / 2),
+                               _observable.getObserverCount());
+
+               control.reset();
+               final String message2 = "blabla";
+
+               for (int i = 0; i < nsubscribers / 2; i++) {
+                       mocks[i].send(_observed, message2);
+               }
+               control.replay();
+
+               _observable.send(message2);
+               control.verify();
+       }
+
+       /**
+        * Subscribes and then unsubscribes with a wrong id. Verifies that
+        * IllegalArgumentException is thrown.
+        * 
+        */
+       public void testUnsubscribeWithWrongSubscription() {
+               Observer<Integer, String> observer = createMock(Observer.class);
+               replay(observer);
+               
+               long subscription = _observable.subscribe(observer);
+
+               assertEquals(1, _observable.getObserverCount());
+
+               try {
+                       _observable.unsubscribe(subscription + 1);
+               } catch (IllegalArgumentException e) {
+                       return; // ok
+               }
+               fail();
+       }
+}