| /* |
| * Copyright (C) 2015 The Android Open Source Project |
| * |
| * 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 com.android.tools.idea.ui.properties; |
| |
| import com.intellij.util.GCUtil; |
| import org.jetbrains.annotations.NotNull; |
| import org.junit.Test; |
| |
| import static org.fest.assertions.Assertions.assertThat; |
| |
| public final class ObservableValueTest { |
| |
| @Test |
| public void listenerIsTriggeredOnInvalidation() throws Exception { |
| CountListener listener = new CountListener(); |
| MockObservable mockObservable = new MockObservable(); |
| mockObservable.addListener(listener); |
| |
| assertThat(listener.getCount()).isEqualTo(0); |
| |
| mockObservable.fireInvalidated(); |
| assertThat(listener.getCount()).isEqualTo(1); |
| |
| mockObservable.fireInvalidated(); |
| assertThat(listener.getCount()).isEqualTo(2); |
| } |
| |
| @Test |
| public void removeListenerPreventsFurtherCallbacks() throws Exception { |
| CountListener listener = new CountListener(); |
| MockObservable mockObservable = new MockObservable(); |
| mockObservable.addListener(listener); |
| |
| assertThat(listener.getCount()).isEqualTo(0); |
| |
| mockObservable.fireInvalidated(); |
| assertThat(listener.getCount()).isEqualTo(1); |
| |
| mockObservable.removeListener(listener); |
| |
| mockObservable.fireInvalidated(); |
| assertThat(listener.getCount()).isEqualTo(1); |
| } |
| |
| @Test |
| public void weakListenersCanBeRemovedManually() throws Exception { |
| CountListener listener = new CountListener(); |
| MockObservable mockObservable = new MockObservable(); |
| mockObservable.addWeakListener(listener); |
| mockObservable.removeListener(listener); |
| |
| mockObservable.fireInvalidated(); |
| assertThat(listener.getCount()).isZero(); |
| } |
| |
| /** |
| * This test works but is slow (2 seconds) and almost certainly dependent on GC implementation. |
| * Therefore, it is commented out, but you can run it locally to see it work. |
| */ |
| //@Test |
| public void weakListenerIsRemovedAutomaticallyByGc() throws Exception { |
| final MutableInt strongCount = new MutableInt(); |
| final MutableInt weakCount = new MutableInt(); |
| MockObservable mockObservable = new MockObservable(); |
| mockObservable.addListener(new InvalidationListener() { |
| @Override |
| protected void onInvalidated(@NotNull Observable sender) { |
| strongCount.value++; |
| } |
| }); |
| mockObservable.addWeakListener(new InvalidationListener() { |
| @Override |
| protected void onInvalidated(@NotNull Observable sender) { |
| weakCount.value++; |
| } |
| }); |
| |
| assertThat(strongCount.value).isEqualTo(0); |
| assertThat(weakCount.value).isEqualTo(0); |
| |
| mockObservable.fireInvalidated(); |
| assertThat(strongCount.value).isEqualTo(1); |
| assertThat(weakCount.value).isEqualTo(1); |
| |
| GCUtil.tryForceGC(); |
| |
| mockObservable.fireInvalidated(); |
| assertThat(strongCount.value).isEqualTo(2); |
| assertThat(weakCount.value).isEqualTo(1); |
| } |
| |
| private static final class MockObservable extends AbstractObservable { |
| public void fireInvalidated() { |
| notifyInvalidated(); |
| } |
| } |
| |
| private static final class MutableInt { |
| public int value; |
| } |
| } |