Merge "[Settings] Code refactor for async Lifecycle listening" into tm-dev

tests/unit/src/com/android/settings/network/helper/LifecycleCallbackConverterTest.java

@@ -0,0 +1,120 @@
+/*
+ * Copyright (C) 2022 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.settings.network.helper;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import androidx.lifecycle.Lifecycle;
+import androidx.lifecycle.LifecycleOwner;
+import androidx.lifecycle.LifecycleRegistry;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import java.util.concurrent.Phaser;
+import java.util.concurrent.atomic.AtomicReference;
+import java.util.function.Consumer;
+
+@RunWith(AndroidJUnit4.class)
+public class LifecycleCallbackConverterTest implements LifecycleOwner {
+
+    private final LifecycleRegistry mRegistry = LifecycleRegistry.createUnsafe(this);
+
+    private Object mTestData;
+    private TestConsumer mConsumer;
+    private LifecycleCallbackConverter<Object> mConverter;
+
+    @Before
+    public void setUp() {
+        mTestData = new Object();
+        mConsumer = new TestConsumer();
+        mConverter = new LifecycleCallbackConverter<Object>(getLifecycle(), mConsumer);
+    }
+
+    public Lifecycle getLifecycle() {
+        return mRegistry;
+    }
+
+    @Test
+    public void converter_dropResult_whenInActive() {
+        mConverter.postResult(mTestData);
+
+        assertThat(mConsumer.getCallbackCount()).isEqualTo(0);
+    }
+
+    @Test
+    public void converter_callbackResult_whenActive() {
+        mRegistry.handleLifecycleEvent(Lifecycle.Event.ON_CREATE);
+        mRegistry.handleLifecycleEvent(Lifecycle.Event.ON_START);
+
+        mConverter.postResult(mTestData);
+        assertThat(mConsumer.getCallbackCount()).isEqualTo(1);
+        assertThat(mConsumer.getData()).isEqualTo(mTestData);
+    }
+
+    @Test
+    public void converter_dropResult_whenBackToInActive() {
+        mRegistry.handleLifecycleEvent(Lifecycle.Event.ON_CREATE);
+        mRegistry.handleLifecycleEvent(Lifecycle.Event.ON_START);
+        mRegistry.handleLifecycleEvent(Lifecycle.Event.ON_STOP);
+
+        mConverter.postResult(mTestData);
+        assertThat(mConsumer.getCallbackCount()).isEqualTo(0);
+    }
+
+    @Test
+    public void converter_passResultToUiThread_whenActive() {
+        mRegistry.handleLifecycleEvent(Lifecycle.Event.ON_CREATE);
+        mRegistry.handleLifecycleEvent(Lifecycle.Event.ON_START);
+
+        final Phaser phaser = new Phaser(1);
+        Thread executionThread = new Thread(() -> {
+            mConverter.postResult(phaser);
+        });
+        executionThread.start();
+        phaser.awaitAdvance(0);
+
+        assertThat(mConsumer.getData()).isEqualTo(phaser);
+        assertThat(mConsumer.getCallbackCount()).isEqualTo(1);
+    }
+
+    public static class TestConsumer implements Consumer<Object> {
+        long mNumberOfCallback;
+        AtomicReference<Object> mLatestData;
+
+        public TestConsumer() {
+            mLatestData = new AtomicReference<Object>();
+        }
+
+        public void accept(Object data) {
+            mLatestData.set(data);
+            mNumberOfCallback ++;
+            if ((data != null) && (data instanceof Phaser)) {
+                ((Phaser)data).arrive();
+            }
+        }
+
+        protected long getCallbackCount() {
+            return mNumberOfCallback;
+        }
+
+        protected Object getData() {
+            return mLatestData.get();
+        }
+    }
+}