media/tests/MediaRouter/src/com/android/mediaroutertest/MediaRouter2ManagerTest.java - platform/frameworks/base - Gitiles

 /*
  * Copyright 2019 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.mediaroutertest;

 import static android.media.MediaRoute2Info.FEATURE_LIVE_AUDIO;
 import static android.media.MediaRoute2Info.PLAYBACK_VOLUME_FIXED;
 import static android.media.MediaRoute2Info.PLAYBACK_VOLUME_VARIABLE;

 import static com.android.mediaroutertest.SampleMediaRoute2ProviderService.ACTION_REMOVE_ROUTE;
 import static com.android.mediaroutertest.SampleMediaRoute2ProviderService.FEATURE_SAMPLE;
 import static com.android.mediaroutertest.SampleMediaRoute2ProviderService.FEATURE_SPECIAL;
 import static com.android.mediaroutertest.SampleMediaRoute2ProviderService.ROUTE_ID1;
 import static com.android.mediaroutertest.SampleMediaRoute2ProviderService.ROUTE_ID2;
 import static com.android.mediaroutertest.SampleMediaRoute2ProviderService.ROUTE_ID5_TO_TRANSFER_TO;
 import static com.android.mediaroutertest.SampleMediaRoute2ProviderService.ROUTE_ID_FIXED_VOLUME;
 import static com.android.mediaroutertest.SampleMediaRoute2ProviderService.ROUTE_ID_SPECIAL_FEATURE;
 import static com.android.mediaroutertest.SampleMediaRoute2ProviderService.ROUTE_ID_VARIABLE_VOLUME;
 import static com.android.mediaroutertest.SampleMediaRoute2ProviderService.ROUTE_NAME1;
 import static com.android.mediaroutertest.SampleMediaRoute2ProviderService.ROUTE_NAME2;
 import static com.android.mediaroutertest.SampleMediaRoute2ProviderService.VOLUME_MAX;

 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertTrue;

 import android.content.Context;
 import android.content.Intent;
 import android.media.MediaRoute2Info;
 import android.media.MediaRouter2;
 import android.media.MediaRouter2.RouteCallback;
 import android.media.MediaRouter2.RoutingControllerCallback;
 import android.media.MediaRouter2Manager;
 import android.media.MediaRouter2Utils;
 import android.media.RouteDiscoveryPreference;
 import android.media.RoutingSessionInfo;
 import android.support.test.InstrumentationRegistry;
 import android.support.test.filters.SmallTest;
 import android.support.test.runner.AndroidJUnit4;
 import android.text.TextUtils;

 import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;

 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.Executor;
 import java.util.concurrent.Executors;
 import java.util.concurrent.TimeUnit;
 import java.util.function.Predicate;

 @RunWith(AndroidJUnit4.class)
 @SmallTest
 public class MediaRouter2ManagerTest {
     private static final String TAG = "MediaRouter2ManagerTest";
     private static final int TIMEOUT_MS = 5000;

     private Context mContext;
     private MediaRouter2Manager mManager;
     private MediaRouter2 mRouter2;
     private Executor mExecutor;
     private String mPackageName;

     private final List<MediaRouter2Manager.Callback> mManagerCallbacks = new ArrayList<>();
     private final List<RouteCallback> mRouteCallbacks = new ArrayList<>();
     private final List<RoutingControllerCallback> mControllerCallbacks = new ArrayList<>();

     public static final List<String> FEATURES_ALL = new ArrayList();
     public static final List<String> FEATURES_SPECIAL = new ArrayList();
     private static final List<String> FEATURES_LIVE_AUDIO = new ArrayList<>();

     static {
         FEATURES_ALL.add(FEATURE_SAMPLE);
         FEATURES_ALL.add(FEATURE_SPECIAL);
         FEATURES_ALL.add(FEATURE_LIVE_AUDIO);

         FEATURES_SPECIAL.add(FEATURE_SPECIAL);

         FEATURES_LIVE_AUDIO.add(FEATURE_LIVE_AUDIO);
     }

     @Before
     public void setUp() throws Exception {
         mContext = InstrumentationRegistry.getTargetContext();
         mManager = MediaRouter2Manager.getInstance(mContext);
         mRouter2 = MediaRouter2.getInstance(mContext);
         //TODO: If we need to support thread pool executors, change this to thread pool executor.
         mExecutor = Executors.newSingleThreadExecutor();
         mPackageName = mContext.getPackageName();
     }

     @After
     public void tearDown() {
         // order matters (callbacks should be cleared at the last)
         releaseAllSessions();
         // unregister callbacks
         clearCallbacks();
     }

     /**
      * Tests if routes are added correctly when a new callback is registered.
      */
     @Test
     public void testOnRoutesAdded() throws Exception {
         CountDownLatch latch = new CountDownLatch(1);
         addManagerCallback(new MediaRouter2Manager.Callback() {
             @Override
             public void onRoutesAdded(List<MediaRoute2Info> routes) {
                 assertTrue(routes.size() > 0);
                 for (MediaRoute2Info route : routes) {
                     if (route.getOriginalId().equals(ROUTE_ID1)
                             && route.getName().equals(ROUTE_NAME1)) {
                         latch.countDown();
                     }
                 }
             }
         });

         assertTrue(latch.await(TIMEOUT_MS, TimeUnit.MILLISECONDS));
     }

     @Test
     public void testOnRoutesRemoved() throws Exception {
         CountDownLatch latch = new CountDownLatch(1);
         Map<String, MediaRoute2Info> routes = waitAndGetRoutesWithManager(FEATURES_ALL);

         addRouterCallback(new RouteCallback());
         addManagerCallback(new MediaRouter2Manager.Callback() {
             @Override
             public void onRoutesRemoved(List<MediaRoute2Info> routes) {
                 assertTrue(routes.size() > 0);
                 for (MediaRoute2Info route : routes) {
                     if (route.getOriginalId().equals(ROUTE_ID2)
                             && route.getName().equals(ROUTE_NAME2)) {
                         latch.countDown();
                     }
                 }
             }
         });

         //TODO: Figure out a more proper way to test.
         // (Control requests shouldn't be used in this way.)
         mRouter2.sendControlRequest(routes.get(ROUTE_ID2), new Intent(ACTION_REMOVE_ROUTE));
         assertTrue(latch.await(TIMEOUT_MS, TimeUnit.MILLISECONDS));
     }

     /**
      * Tests if we get proper routes for application that has special route feature.
      */
     @Test
     public void testRouteFeatures() throws Exception {
         Map<String, MediaRoute2Info> routes = waitAndGetRoutesWithManager(FEATURES_SPECIAL);

         int routeCount = 0;
         for (MediaRoute2Info route : routes.values()) {
             if (!route.isSystemRoute()) {
                 routeCount++;
             }
         }

         assertEquals(1, routeCount);
         assertNotNull(routes.get(ROUTE_ID_SPECIAL_FEATURE));
     }

     /**
      * Tests if MR2.SessionCallback.onSessionCreated is called
      * when a route is selected from MR2Manager.
      */
     @Test
     public void testRouterOnSessionCreated() throws Exception {
         Map<String, MediaRoute2Info> routes = waitAndGetRoutesWithManager(FEATURES_ALL);

         CountDownLatch latch = new CountDownLatch(1);

         addManagerCallback(new MediaRouter2Manager.Callback());
         //TODO: remove this when it's not necessary.
         addRouterCallback(new MediaRouter2.RouteCallback());
         addSessionCallback(new RoutingControllerCallback() {
             @Override
             public void onControllerCreated(MediaRouter2.RoutingController controller) {
                 if (createRouteMap(controller.getSelectedRoutes()).containsKey(ROUTE_ID1)) {
                     latch.countDown();
                 }
             }
         });

         MediaRoute2Info routeToSelect = routes.get(ROUTE_ID1);
         assertNotNull(routeToSelect);

         mManager.selectRoute(mPackageName, routeToSelect);
         assertTrue(latch.await(TIMEOUT_MS, TimeUnit.MILLISECONDS));
         assertEquals(2, mManager.getActiveSessions().size());
     }

     @Test
     public void testGetRoutingControllers() throws Exception {
         CountDownLatch latch = new CountDownLatch(1);

         Map<String, MediaRoute2Info> routes = waitAndGetRoutesWithManager(FEATURES_ALL);
         addRouterCallback(new RouteCallback());
         addManagerCallback(new MediaRouter2Manager.Callback() {
             @Override
             public void onSessionCreated(MediaRouter2Manager.RoutingController controller) {
                 if (TextUtils.equals(mPackageName, controller.getClientPackageName())
                         && createRouteMap(controller.getSelectedRoutes()).containsKey(ROUTE_ID1)) {
                     latch.countDown();
                 }
             }
         });

         assertEquals(1, mManager.getRoutingSessions(mPackageName).size());

         mManager.selectRoute(mPackageName, routes.get(ROUTE_ID1));
         latch.await(TIMEOUT_MS, TimeUnit.MILLISECONDS);

         List<RoutingSessionInfo> sessions = mManager.getRoutingSessions(mPackageName);

         assertEquals(2, sessions.size());

         MediaRouter2Manager.RoutingController routingController =
                 mManager.getControllerForSession(sessions.get(1));
         awaitOnRouteChangedManager(
                 () -> routingController.release(),
                 ROUTE_ID1,
                 route -> TextUtils.equals(route.getClientPackageName(), null));
         assertEquals(1, mManager.getRoutingSessions(mPackageName).size());
     }

     /**
      * Tests select, transfer, release of routes of a provider
      */
     @Test
     public void testSelectAndTransferAndRelease() throws Exception {
         Map<String, MediaRoute2Info> routes = waitAndGetRoutesWithManager(FEATURES_ALL);
         addRouterCallback(new RouteCallback());

         CountDownLatch onSessionCreatedLatch = new CountDownLatch(1);

         addManagerCallback(new MediaRouter2Manager.Callback() {
             @Override
             public void onSessionCreated(MediaRouter2Manager.RoutingController controller) {
                 assertNotNull(controller);
                 onSessionCreatedLatch.countDown();
             }
         });
         awaitOnRouteChangedManager(
                 () -> mManager.selectRoute(mPackageName, routes.get(ROUTE_ID1)),
                 ROUTE_ID1,
                 route -> TextUtils.equals(route.getClientPackageName(), mPackageName));
         assertTrue(onSessionCreatedLatch.await(TIMEOUT_MS, TimeUnit.MILLISECONDS));

         List<RoutingSessionInfo> sessions = mManager.getRoutingSessions(mPackageName);

         assertEquals(2, sessions.size());
         MediaRouter2Manager.RoutingController routingController =
                 mManager.getControllerForSession(sessions.get(1));

         awaitOnRouteChangedManager(
                 () -> mManager.selectRoute(mPackageName, routes.get(ROUTE_ID5_TO_TRANSFER_TO)),
                 ROUTE_ID5_TO_TRANSFER_TO,
                 route -> TextUtils.equals(route.getClientPackageName(), mPackageName));

         awaitOnRouteChangedManager(
                 () -> routingController.release(),
                 ROUTE_ID5_TO_TRANSFER_TO,
                 route -> TextUtils.equals(route.getClientPackageName(), null));
     }

     @Test
     public void testSetSystemRouteVolume() throws Exception {
         // ensure client
         addManagerCallback(new MediaRouter2Manager.Callback());
         String selectedSystemRouteId =
                 MediaRouter2Utils.getOriginalId(
                 mManager.getActiveSessions().get(0).getSelectedRoutes().get(0));
         Map<String, MediaRoute2Info> routes = waitAndGetRoutesWithManager(Collections.emptyList());
         MediaRoute2Info volRoute = routes.get(selectedSystemRouteId);
         assertNotNull(volRoute);

         int originalVolume = volRoute.getVolume();
         int targetVolume = originalVolume == volRoute.getVolumeMax()
                 ? originalVolume - 1 : originalVolume + 1;

         awaitOnRouteChangedManager(
                 () -> mManager.setRouteVolume(volRoute, targetVolume),
                 selectedSystemRouteId,
                 (route -> route.getVolume() == targetVolume));

         awaitOnRouteChangedManager(
                 () -> mManager.setRouteVolume(volRoute, originalVolume),
                 selectedSystemRouteId,
                 (route -> route.getVolume() == originalVolume));
     }

     @Test
     public void testSetRouteVolume() throws Exception {
         Map<String, MediaRoute2Info> routes = waitAndGetRoutesWithManager(FEATURES_ALL);
         MediaRoute2Info volRoute = routes.get(ROUTE_ID_VARIABLE_VOLUME);

         int originalVolume = volRoute.getVolume();
         int targetVolume = originalVolume == volRoute.getVolumeMax()
                 ? originalVolume - 1 : originalVolume + 1;

         awaitOnRouteChangedManager(
                 () -> mManager.setRouteVolume(volRoute, targetVolume),
                 ROUTE_ID_VARIABLE_VOLUME,
                 (route -> route.getVolume() == targetVolume));

         awaitOnRouteChangedManager(
                 () -> mManager.setRouteVolume(volRoute, originalVolume),
                 ROUTE_ID_VARIABLE_VOLUME,
                 (route -> route.getVolume() == originalVolume));
     }

     @Test
     public void testSetSessionVolume() throws Exception {
         Map<String, MediaRoute2Info> routes = waitAndGetRoutesWithManager(FEATURES_ALL);
         addRouterCallback(new RouteCallback());

         CountDownLatch onSessionCreatedLatch = new CountDownLatch(1);
         CountDownLatch volumeChangedLatch = new CountDownLatch(2);

         // create a controller
         addManagerCallback(new MediaRouter2Manager.Callback() {
             @Override
             public void onSessionCreated(MediaRouter2Manager.RoutingController controller) {
                 assertNotNull(controller);
                 onSessionCreatedLatch.countDown();
             }
         });

         mManager.selectRoute(mPackageName, routes.get(ROUTE_ID1));
         assertTrue(onSessionCreatedLatch.await(TIMEOUT_MS, TimeUnit.MILLISECONDS));

         List<RoutingSessionInfo> sessions = mManager.getRoutingSessions(mPackageName);
         assertEquals(2, sessions.size());

         // test setSessionVolume
         RoutingSessionInfo sessionInfo = sessions.get(1);
         int currentVolume = sessionInfo.getVolume();
         int targetVolume = (currentVolume == 0) ? 1 : (currentVolume - 1);

         RoutingControllerCallback routingControllerCallback = new RoutingControllerCallback() {
             @Override
             public void onControllerUpdated(MediaRouter2.RoutingController controller) {
                 if (!TextUtils.equals(sessionInfo.getId(), controller.getId())) {
                     return;
                 }
                 if (controller.getVolume() == targetVolume) {
                     volumeChangedLatch.countDown();
                 }
             }
         };
         mRouter2.registerControllerCallback(mExecutor, routingControllerCallback);

         addManagerCallback(new MediaRouter2Manager.Callback() {
             @Override
             public void onSessionsUpdated() {
                 List<RoutingSessionInfo> sessions = mManager.getRoutingSessions(mPackageName);
                 if (sessions.size() != 2) {
                     return;
                 }

                 if (sessions.get(1).getVolume() == targetVolume) {
                     volumeChangedLatch.countDown();
                 }
             }
         });

         mManager.setSessionVolume(sessionInfo, targetVolume);

         try {
             assertTrue(volumeChangedLatch.await(TIMEOUT_MS, TimeUnit.MILLISECONDS));
         } finally {
             mRouter2.unregisterControllerCallback(routingControllerCallback);
         }
     }

     @Test
     public void testVolumeHandling() throws Exception {
         Map<String, MediaRoute2Info> routes = waitAndGetRoutesWithManager(FEATURES_ALL);

         MediaRoute2Info fixedVolumeRoute = routes.get(ROUTE_ID_FIXED_VOLUME);
         MediaRoute2Info variableVolumeRoute = routes.get(ROUTE_ID_VARIABLE_VOLUME);

         assertEquals(PLAYBACK_VOLUME_FIXED, fixedVolumeRoute.getVolumeHandling());
         assertEquals(PLAYBACK_VOLUME_VARIABLE, variableVolumeRoute.getVolumeHandling());
         assertEquals(VOLUME_MAX, variableVolumeRoute.getVolumeMax());
     }

     Map<String, MediaRoute2Info> waitAndGetRoutesWithManager(List<String> routeFeatures)
             throws Exception {
         CountDownLatch latch = new CountDownLatch(2);

         // A dummy callback is required to send route feature info.
         RouteCallback routeCallback = new RouteCallback();
         MediaRouter2Manager.Callback managerCallback = new MediaRouter2Manager.Callback() {
             @Override
             public void onRoutesAdded(List<MediaRoute2Info> routes) {
                 for (int i = 0; i < routes.size(); i++) {
                     if (!routes.get(i).isSystemRoute()) {
                         latch.countDown();
                         break;
                     }
                 }
             }

             @Override
             public void onControlCategoriesChanged(String packageName,
                     List<String> preferredFeatures) {
                 if (TextUtils.equals(mPackageName, packageName)
                         && preferredFeatures.equals(preferredFeatures)) {
                     latch.countDown();
                 }
             }
         };
         mManager.registerCallback(mExecutor, managerCallback);
         mRouter2.registerRouteCallback(mExecutor, routeCallback,
                 new RouteDiscoveryPreference.Builder(routeFeatures, true).build());
         try {
             latch.await(TIMEOUT_MS, TimeUnit.MILLISECONDS);
             return createRouteMap(mManager.getAvailableRoutes(mPackageName));
         } finally {
             mRouter2.unregisterRouteCallback(routeCallback);
             mManager.unregisterCallback(managerCallback);
         }
     }

     void awaitOnRouteChangedManager(Runnable task, String routeId,
             Predicate<MediaRoute2Info> predicate) throws Exception {
         CountDownLatch latch = new CountDownLatch(1);
         MediaRouter2Manager.Callback callback = new MediaRouter2Manager.Callback() {
             @Override
             public void onRoutesChanged(List<MediaRoute2Info> changed) {
                 MediaRoute2Info route = createRouteMap(changed).get(routeId);
                 if (route != null && predicate.test(route)) {
                     latch.countDown();
                 }
             }
         };
         mManager.registerCallback(mExecutor, callback);
         try {
             task.run();
             assertTrue(latch.await(TIMEOUT_MS, TimeUnit.MILLISECONDS));
         } finally {
             mManager.unregisterCallback(callback);
         }
     }

     // Helper for getting routes easily
     static Map<String, MediaRoute2Info> createRouteMap(List<MediaRoute2Info> routes) {
         Map<String, MediaRoute2Info> routeMap = new HashMap<>();
         for (MediaRoute2Info route : routes) {
             routeMap.put(route.getOriginalId(), route);
         }
         return routeMap;
     }

     private void addManagerCallback(MediaRouter2Manager.Callback callback) {
         mManagerCallbacks.add(callback);
         mManager.registerCallback(mExecutor, callback);
     }

     private void addRouterCallback(RouteCallback routeCallback) {
         mRouteCallbacks.add(routeCallback);
         mRouter2.registerRouteCallback(mExecutor, routeCallback, RouteDiscoveryPreference.EMPTY);
     }

     private void addSessionCallback(RoutingControllerCallback controllerCallback) {
         mControllerCallbacks.add(controllerCallback);
         mRouter2.registerControllerCallback(mExecutor, controllerCallback);
     }

     private void clearCallbacks() {
         for (MediaRouter2Manager.Callback callback : mManagerCallbacks) {
             mManager.unregisterCallback(callback);
         }
         mManagerCallbacks.clear();

         for (RouteCallback routeCallback : mRouteCallbacks) {
             mRouter2.unregisterRouteCallback(routeCallback);
         }
         mRouteCallbacks.clear();

         for (RoutingControllerCallback controllerCallback : mControllerCallbacks) {
             mRouter2.unregisterControllerCallback(controllerCallback);
         }
         mControllerCallbacks.clear();
     }

     private void releaseAllSessions() {
         // ensure ManagerRecord in MediaRouter2ServiceImpl
         addManagerCallback(new MediaRouter2Manager.Callback());

         for (RoutingSessionInfo session : mManager.getActiveSessions()) {
             mManager.getControllerForSession(session).release();
         }
     }
 }
	/*
	* Copyright 2019 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.mediaroutertest;

	import static android.media.MediaRoute2Info.FEATURE_LIVE_AUDIO;
	import static android.media.MediaRoute2Info.PLAYBACK_VOLUME_FIXED;
	import static android.media.MediaRoute2Info.PLAYBACK_VOLUME_VARIABLE;

	import static com.android.mediaroutertest.SampleMediaRoute2ProviderService.ACTION_REMOVE_ROUTE;
	import static com.android.mediaroutertest.SampleMediaRoute2ProviderService.FEATURE_SAMPLE;
	import static com.android.mediaroutertest.SampleMediaRoute2ProviderService.FEATURE_SPECIAL;
	import static com.android.mediaroutertest.SampleMediaRoute2ProviderService.ROUTE_ID1;
	import static com.android.mediaroutertest.SampleMediaRoute2ProviderService.ROUTE_ID2;
	import static com.android.mediaroutertest.SampleMediaRoute2ProviderService.ROUTE_ID5_TO_TRANSFER_TO;
	import static com.android.mediaroutertest.SampleMediaRoute2ProviderService.ROUTE_ID_FIXED_VOLUME;
	import static com.android.mediaroutertest.SampleMediaRoute2ProviderService.ROUTE_ID_SPECIAL_FEATURE;
	import static com.android.mediaroutertest.SampleMediaRoute2ProviderService.ROUTE_ID_VARIABLE_VOLUME;
	import static com.android.mediaroutertest.SampleMediaRoute2ProviderService.ROUTE_NAME1;
	import static com.android.mediaroutertest.SampleMediaRoute2ProviderService.ROUTE_NAME2;
	import static com.android.mediaroutertest.SampleMediaRoute2ProviderService.VOLUME_MAX;

	import static org.junit.Assert.assertEquals;
	import static org.junit.Assert.assertNotNull;
	import static org.junit.Assert.assertTrue;

	import android.content.Context;
	import android.content.Intent;
	import android.media.MediaRoute2Info;
	import android.media.MediaRouter2;
	import android.media.MediaRouter2.RouteCallback;
	import android.media.MediaRouter2.RoutingControllerCallback;
	import android.media.MediaRouter2Manager;
	import android.media.MediaRouter2Utils;
	import android.media.RouteDiscoveryPreference;
	import android.media.RoutingSessionInfo;
	import android.support.test.InstrumentationRegistry;
	import android.support.test.filters.SmallTest;
	import android.support.test.runner.AndroidJUnit4;
	import android.text.TextUtils;

	import org.junit.After;
	import org.junit.Before;
	import org.junit.Test;
	import org.junit.runner.RunWith;

	import java.util.ArrayList;
	import java.util.Collections;
	import java.util.HashMap;
	import java.util.List;
	import java.util.Map;
	import java.util.concurrent.CountDownLatch;
	import java.util.concurrent.Executor;
	import java.util.concurrent.Executors;
	import java.util.concurrent.TimeUnit;
	import java.util.function.Predicate;

	@RunWith(AndroidJUnit4.class)
	@SmallTest
	public class MediaRouter2ManagerTest {
	private static final String TAG = "MediaRouter2ManagerTest";
	private static final int TIMEOUT_MS = 5000;

	private Context mContext;
	private MediaRouter2Manager mManager;
	private MediaRouter2 mRouter2;
	private Executor mExecutor;
	private String mPackageName;

	private final List<MediaRouter2Manager.Callback> mManagerCallbacks = new ArrayList<>();
	private final List<RouteCallback> mRouteCallbacks = new ArrayList<>();
	private final List<RoutingControllerCallback> mControllerCallbacks = new ArrayList<>();

	public static final List<String> FEATURES_ALL = new ArrayList();
	public static final List<String> FEATURES_SPECIAL = new ArrayList();
	private static final List<String> FEATURES_LIVE_AUDIO = new ArrayList<>();

	static {
	FEATURES_ALL.add(FEATURE_SAMPLE);
	FEATURES_ALL.add(FEATURE_SPECIAL);
	FEATURES_ALL.add(FEATURE_LIVE_AUDIO);

	FEATURES_SPECIAL.add(FEATURE_SPECIAL);

	FEATURES_LIVE_AUDIO.add(FEATURE_LIVE_AUDIO);
	}

	@Before
	public void setUp() throws Exception {
	mContext = InstrumentationRegistry.getTargetContext();
	mManager = MediaRouter2Manager.getInstance(mContext);
	mRouter2 = MediaRouter2.getInstance(mContext);
	//TODO: If we need to support thread pool executors, change this to thread pool executor.
	mExecutor = Executors.newSingleThreadExecutor();
	mPackageName = mContext.getPackageName();
	}

	@After
	public void tearDown() {
	// order matters (callbacks should be cleared at the last)
	releaseAllSessions();
	// unregister callbacks
	clearCallbacks();
	}

	/**
	* Tests if routes are added correctly when a new callback is registered.
	*/
	@Test
	public void testOnRoutesAdded() throws Exception {
	CountDownLatch latch = new CountDownLatch(1);
	addManagerCallback(new MediaRouter2Manager.Callback() {
	@Override
	public void onRoutesAdded(List<MediaRoute2Info> routes) {
	assertTrue(routes.size() > 0);
	for (MediaRoute2Info route : routes) {
	if (route.getOriginalId().equals(ROUTE_ID1)
	&& route.getName().equals(ROUTE_NAME1)) {
	latch.countDown();
	}
	}
	}
	});

	assertTrue(latch.await(TIMEOUT_MS, TimeUnit.MILLISECONDS));
	}

	@Test
	public void testOnRoutesRemoved() throws Exception {
	CountDownLatch latch = new CountDownLatch(1);
	Map<String, MediaRoute2Info> routes = waitAndGetRoutesWithManager(FEATURES_ALL);

	addRouterCallback(new RouteCallback());
	addManagerCallback(new MediaRouter2Manager.Callback() {
	@Override
	public void onRoutesRemoved(List<MediaRoute2Info> routes) {
	assertTrue(routes.size() > 0);
	for (MediaRoute2Info route : routes) {
	if (route.getOriginalId().equals(ROUTE_ID2)
	&& route.getName().equals(ROUTE_NAME2)) {
	latch.countDown();
	}
	}
	}
	});

	//TODO: Figure out a more proper way to test.
	// (Control requests shouldn't be used in this way.)
	mRouter2.sendControlRequest(routes.get(ROUTE_ID2), new Intent(ACTION_REMOVE_ROUTE));
	assertTrue(latch.await(TIMEOUT_MS, TimeUnit.MILLISECONDS));
	}

	/**
	* Tests if we get proper routes for application that has special route feature.
	*/
	@Test
	public void testRouteFeatures() throws Exception {
	Map<String, MediaRoute2Info> routes = waitAndGetRoutesWithManager(FEATURES_SPECIAL);

	int routeCount = 0;
	for (MediaRoute2Info route : routes.values()) {
	if (!route.isSystemRoute()) {
	routeCount++;
	}
	}

	assertEquals(1, routeCount);
	assertNotNull(routes.get(ROUTE_ID_SPECIAL_FEATURE));
	}

	/**
	* Tests if MR2.SessionCallback.onSessionCreated is called
	* when a route is selected from MR2Manager.
	*/
	@Test
	public void testRouterOnSessionCreated() throws Exception {
	Map<String, MediaRoute2Info> routes = waitAndGetRoutesWithManager(FEATURES_ALL);

	CountDownLatch latch = new CountDownLatch(1);

	addManagerCallback(new MediaRouter2Manager.Callback());
	//TODO: remove this when it's not necessary.
	addRouterCallback(new MediaRouter2.RouteCallback());
	addSessionCallback(new RoutingControllerCallback() {
	@Override
	public void onControllerCreated(MediaRouter2.RoutingController controller) {
	if (createRouteMap(controller.getSelectedRoutes()).containsKey(ROUTE_ID1)) {
	latch.countDown();
	}
	}
	});

	MediaRoute2Info routeToSelect = routes.get(ROUTE_ID1);
	assertNotNull(routeToSelect);

	mManager.selectRoute(mPackageName, routeToSelect);
	assertTrue(latch.await(TIMEOUT_MS, TimeUnit.MILLISECONDS));
	assertEquals(2, mManager.getActiveSessions().size());
	}

	@Test
	public void testGetRoutingControllers() throws Exception {
	CountDownLatch latch = new CountDownLatch(1);

	Map<String, MediaRoute2Info> routes = waitAndGetRoutesWithManager(FEATURES_ALL);
	addRouterCallback(new RouteCallback());
	addManagerCallback(new MediaRouter2Manager.Callback() {
	@Override
	public void onSessionCreated(MediaRouter2Manager.RoutingController controller) {
	if (TextUtils.equals(mPackageName, controller.getClientPackageName())
	&& createRouteMap(controller.getSelectedRoutes()).containsKey(ROUTE_ID1)) {
	latch.countDown();
	}
	}
	});

	assertEquals(1, mManager.getRoutingSessions(mPackageName).size());

	mManager.selectRoute(mPackageName, routes.get(ROUTE_ID1));
	latch.await(TIMEOUT_MS, TimeUnit.MILLISECONDS);

	List<RoutingSessionInfo> sessions = mManager.getRoutingSessions(mPackageName);

	assertEquals(2, sessions.size());

	MediaRouter2Manager.RoutingController routingController =
	mManager.getControllerForSession(sessions.get(1));
	awaitOnRouteChangedManager(
	() -> routingController.release(),
	ROUTE_ID1,
	route -> TextUtils.equals(route.getClientPackageName(), null));
	assertEquals(1, mManager.getRoutingSessions(mPackageName).size());
	}

	/**
	* Tests select, transfer, release of routes of a provider
	*/
	@Test
	public void testSelectAndTransferAndRelease() throws Exception {
	Map<String, MediaRoute2Info> routes = waitAndGetRoutesWithManager(FEATURES_ALL);
	addRouterCallback(new RouteCallback());

	CountDownLatch onSessionCreatedLatch = new CountDownLatch(1);

	addManagerCallback(new MediaRouter2Manager.Callback() {
	@Override
	public void onSessionCreated(MediaRouter2Manager.RoutingController controller) {
	assertNotNull(controller);
	onSessionCreatedLatch.countDown();
	}
	});
	awaitOnRouteChangedManager(
	() -> mManager.selectRoute(mPackageName, routes.get(ROUTE_ID1)),
	ROUTE_ID1,
	route -> TextUtils.equals(route.getClientPackageName(), mPackageName));
	assertTrue(onSessionCreatedLatch.await(TIMEOUT_MS, TimeUnit.MILLISECONDS));

	List<RoutingSessionInfo> sessions = mManager.getRoutingSessions(mPackageName);

	assertEquals(2, sessions.size());
	MediaRouter2Manager.RoutingController routingController =
	mManager.getControllerForSession(sessions.get(1));

	awaitOnRouteChangedManager(
	() -> mManager.selectRoute(mPackageName, routes.get(ROUTE_ID5_TO_TRANSFER_TO)),
	ROUTE_ID5_TO_TRANSFER_TO,
	route -> TextUtils.equals(route.getClientPackageName(), mPackageName));

	awaitOnRouteChangedManager(
	() -> routingController.release(),
	ROUTE_ID5_TO_TRANSFER_TO,
	route -> TextUtils.equals(route.getClientPackageName(), null));
	}

	@Test
	public void testSetSystemRouteVolume() throws Exception {
	// ensure client
	addManagerCallback(new MediaRouter2Manager.Callback());
	String selectedSystemRouteId =
	MediaRouter2Utils.getOriginalId(
	mManager.getActiveSessions().get(0).getSelectedRoutes().get(0));
	Map<String, MediaRoute2Info> routes = waitAndGetRoutesWithManager(Collections.emptyList());
	MediaRoute2Info volRoute = routes.get(selectedSystemRouteId);
	assertNotNull(volRoute);

	int originalVolume = volRoute.getVolume();
	int targetVolume = originalVolume == volRoute.getVolumeMax()
	? originalVolume - 1 : originalVolume + 1;

	awaitOnRouteChangedManager(
	() -> mManager.setRouteVolume(volRoute, targetVolume),
	selectedSystemRouteId,
	(route -> route.getVolume() == targetVolume));

	awaitOnRouteChangedManager(
	() -> mManager.setRouteVolume(volRoute, originalVolume),
	selectedSystemRouteId,
	(route -> route.getVolume() == originalVolume));
	}

	@Test
	public void testSetRouteVolume() throws Exception {
	Map<String, MediaRoute2Info> routes = waitAndGetRoutesWithManager(FEATURES_ALL);
	MediaRoute2Info volRoute = routes.get(ROUTE_ID_VARIABLE_VOLUME);

	int originalVolume = volRoute.getVolume();
	int targetVolume = originalVolume == volRoute.getVolumeMax()
	? originalVolume - 1 : originalVolume + 1;

	awaitOnRouteChangedManager(
	() -> mManager.setRouteVolume(volRoute, targetVolume),
	ROUTE_ID_VARIABLE_VOLUME,
	(route -> route.getVolume() == targetVolume));

	awaitOnRouteChangedManager(
	() -> mManager.setRouteVolume(volRoute, originalVolume),
	ROUTE_ID_VARIABLE_VOLUME,
	(route -> route.getVolume() == originalVolume));
	}

	@Test
	public void testSetSessionVolume() throws Exception {
	Map<String, MediaRoute2Info> routes = waitAndGetRoutesWithManager(FEATURES_ALL);
	addRouterCallback(new RouteCallback());

	CountDownLatch onSessionCreatedLatch = new CountDownLatch(1);
	CountDownLatch volumeChangedLatch = new CountDownLatch(2);

	// create a controller
	addManagerCallback(new MediaRouter2Manager.Callback() {
	@Override
	public void onSessionCreated(MediaRouter2Manager.RoutingController controller) {
	assertNotNull(controller);
	onSessionCreatedLatch.countDown();
	}
	});

	mManager.selectRoute(mPackageName, routes.get(ROUTE_ID1));
	assertTrue(onSessionCreatedLatch.await(TIMEOUT_MS, TimeUnit.MILLISECONDS));

	List<RoutingSessionInfo> sessions = mManager.getRoutingSessions(mPackageName);
	assertEquals(2, sessions.size());

	// test setSessionVolume
	RoutingSessionInfo sessionInfo = sessions.get(1);
	int currentVolume = sessionInfo.getVolume();
	int targetVolume = (currentVolume == 0) ? 1 : (currentVolume - 1);

	RoutingControllerCallback routingControllerCallback = new RoutingControllerCallback() {
	@Override
	public void onControllerUpdated(MediaRouter2.RoutingController controller) {
	if (!TextUtils.equals(sessionInfo.getId(), controller.getId())) {
	return;
	}
	if (controller.getVolume() == targetVolume) {
	volumeChangedLatch.countDown();
	}
	}
	};
	mRouter2.registerControllerCallback(mExecutor, routingControllerCallback);

	addManagerCallback(new MediaRouter2Manager.Callback() {
	@Override
	public void onSessionsUpdated() {
	List<RoutingSessionInfo> sessions = mManager.getRoutingSessions(mPackageName);
	if (sessions.size() != 2) {
	return;
	}

	if (sessions.get(1).getVolume() == targetVolume) {
	volumeChangedLatch.countDown();
	}
	}
	});

	mManager.setSessionVolume(sessionInfo, targetVolume);

	try {
	assertTrue(volumeChangedLatch.await(TIMEOUT_MS, TimeUnit.MILLISECONDS));
	} finally {
	mRouter2.unregisterControllerCallback(routingControllerCallback);
	}
	}

	@Test
	public void testVolumeHandling() throws Exception {
	Map<String, MediaRoute2Info> routes = waitAndGetRoutesWithManager(FEATURES_ALL);

	MediaRoute2Info fixedVolumeRoute = routes.get(ROUTE_ID_FIXED_VOLUME);
	MediaRoute2Info variableVolumeRoute = routes.get(ROUTE_ID_VARIABLE_VOLUME);

	assertEquals(PLAYBACK_VOLUME_FIXED, fixedVolumeRoute.getVolumeHandling());
	assertEquals(PLAYBACK_VOLUME_VARIABLE, variableVolumeRoute.getVolumeHandling());
	assertEquals(VOLUME_MAX, variableVolumeRoute.getVolumeMax());
	}

	Map<String, MediaRoute2Info> waitAndGetRoutesWithManager(List<String> routeFeatures)
	throws Exception {
	CountDownLatch latch = new CountDownLatch(2);

	// A dummy callback is required to send route feature info.
	RouteCallback routeCallback = new RouteCallback();
	MediaRouter2Manager.Callback managerCallback = new MediaRouter2Manager.Callback() {
	@Override
	public void onRoutesAdded(List<MediaRoute2Info> routes) {
	for (int i = 0; i < routes.size(); i++) {
	if (!routes.get(i).isSystemRoute()) {
	latch.countDown();
	break;
	}
	}
	}

	@Override
	public void onControlCategoriesChanged(String packageName,
	List<String> preferredFeatures) {
	if (TextUtils.equals(mPackageName, packageName)
	&& preferredFeatures.equals(preferredFeatures)) {
	latch.countDown();
	}
	}
	};
	mManager.registerCallback(mExecutor, managerCallback);
	mRouter2.registerRouteCallback(mExecutor, routeCallback,
	new RouteDiscoveryPreference.Builder(routeFeatures, true).build());
	try {
	latch.await(TIMEOUT_MS, TimeUnit.MILLISECONDS);
	return createRouteMap(mManager.getAvailableRoutes(mPackageName));
	} finally {
	mRouter2.unregisterRouteCallback(routeCallback);
	mManager.unregisterCallback(managerCallback);
	}
	}

	void awaitOnRouteChangedManager(Runnable task, String routeId,
	Predicate<MediaRoute2Info> predicate) throws Exception {
	CountDownLatch latch = new CountDownLatch(1);
	MediaRouter2Manager.Callback callback = new MediaRouter2Manager.Callback() {
	@Override
	public void onRoutesChanged(List<MediaRoute2Info> changed) {
	MediaRoute2Info route = createRouteMap(changed).get(routeId);
	if (route != null && predicate.test(route)) {
	latch.countDown();
	}
	}
	};
	mManager.registerCallback(mExecutor, callback);
	try {
	task.run();
	assertTrue(latch.await(TIMEOUT_MS, TimeUnit.MILLISECONDS));
	} finally {
	mManager.unregisterCallback(callback);
	}
	}

	// Helper for getting routes easily
	static Map<String, MediaRoute2Info> createRouteMap(List<MediaRoute2Info> routes) {
	Map<String, MediaRoute2Info> routeMap = new HashMap<>();
	for (MediaRoute2Info route : routes) {
	routeMap.put(route.getOriginalId(), route);
	}
	return routeMap;
	}

	private void addManagerCallback(MediaRouter2Manager.Callback callback) {
	mManagerCallbacks.add(callback);
	mManager.registerCallback(mExecutor, callback);
	}

	private void addRouterCallback(RouteCallback routeCallback) {
	mRouteCallbacks.add(routeCallback);
	mRouter2.registerRouteCallback(mExecutor, routeCallback, RouteDiscoveryPreference.EMPTY);
	}

	private void addSessionCallback(RoutingControllerCallback controllerCallback) {
	mControllerCallbacks.add(controllerCallback);
	mRouter2.registerControllerCallback(mExecutor, controllerCallback);
	}

	private void clearCallbacks() {
	for (MediaRouter2Manager.Callback callback : mManagerCallbacks) {
	mManager.unregisterCallback(callback);
	}
	mManagerCallbacks.clear();

	for (RouteCallback routeCallback : mRouteCallbacks) {
	mRouter2.unregisterRouteCallback(routeCallback);
	}
	mRouteCallbacks.clear();

	for (RoutingControllerCallback controllerCallback : mControllerCallbacks) {
	mRouter2.unregisterControllerCallback(controllerCallback);
	}
	mControllerCallbacks.clear();
	}

	private void releaseAllSessions() {
	// ensure ManagerRecord in MediaRouter2ServiceImpl
	addManagerCallback(new MediaRouter2Manager.Callback());

	for (RoutingSessionInfo session : mManager.getActiveSessions()) {
	mManager.getControllerForSession(session).release();
	}
	}
	}