/*
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* Copyright (C) 2013 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.server.media;
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import android.content.ComponentName;
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import android.content.Context;
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import android.content.Intent;
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import android.content.ServiceConnection;
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import android.media.IRemoteDisplayCallback;
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import android.media.IRemoteDisplayProvider;
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import android.media.RemoteDisplayState;
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import android.os.Handler;
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import android.os.IBinder;
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import android.os.RemoteException;
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import android.os.IBinder.DeathRecipient;
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import android.os.UserHandle;
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import android.util.Log;
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import android.util.Slog;
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import java.io.PrintWriter;
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import java.lang.ref.WeakReference;
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import java.util.Objects;
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/**
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* Maintains a connection to a particular remote display provider service.
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*/
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final class RemoteDisplayProviderProxy implements ServiceConnection {
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private static final String TAG = "RemoteDisplayProvider"; // max. 23 chars
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private static final boolean DEBUG = Log.isLoggable(TAG, Log.DEBUG);
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private final Context mContext;
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private final ComponentName mComponentName;
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private final int mUserId;
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private final Handler mHandler;
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private Callback mDisplayStateCallback;
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// Connection state
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private boolean mRunning;
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private boolean mBound;
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private Connection mActiveConnection;
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private boolean mConnectionReady;
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// Logical state
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private int mDiscoveryMode;
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private String mSelectedDisplayId;
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private RemoteDisplayState mDisplayState;
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private boolean mScheduledDisplayStateChangedCallback;
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public RemoteDisplayProviderProxy(Context context, ComponentName componentName,
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int userId) {
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mContext = context;
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mComponentName = componentName;
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mUserId = userId;
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mHandler = new Handler();
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}
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public void dump(PrintWriter pw, String prefix) {
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pw.println(prefix + "Proxy");
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pw.println(prefix + " mUserId=" + mUserId);
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pw.println(prefix + " mRunning=" + mRunning);
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pw.println(prefix + " mBound=" + mBound);
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pw.println(prefix + " mActiveConnection=" + mActiveConnection);
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pw.println(prefix + " mConnectionReady=" + mConnectionReady);
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pw.println(prefix + " mDiscoveryMode=" + mDiscoveryMode);
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pw.println(prefix + " mSelectedDisplayId=" + mSelectedDisplayId);
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pw.println(prefix + " mDisplayState=" + mDisplayState);
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}
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public void setCallback(Callback callback) {
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mDisplayStateCallback = callback;
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}
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public RemoteDisplayState getDisplayState() {
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return mDisplayState;
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}
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public void setDiscoveryMode(int mode) {
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if (mDiscoveryMode != mode) {
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mDiscoveryMode = mode;
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if (mConnectionReady) {
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mActiveConnection.setDiscoveryMode(mode);
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}
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updateBinding();
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}
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}
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public void setSelectedDisplay(String id) {
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if (!Objects.equals(mSelectedDisplayId, id)) {
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if (mConnectionReady && mSelectedDisplayId != null) {
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mActiveConnection.disconnect(mSelectedDisplayId);
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}
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mSelectedDisplayId = id;
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if (mConnectionReady && id != null) {
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mActiveConnection.connect(id);
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}
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updateBinding();
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}
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}
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public void setDisplayVolume(int volume) {
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if (mConnectionReady && mSelectedDisplayId != null) {
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mActiveConnection.setVolume(mSelectedDisplayId, volume);
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}
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}
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public void adjustDisplayVolume(int delta) {
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if (mConnectionReady && mSelectedDisplayId != null) {
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mActiveConnection.adjustVolume(mSelectedDisplayId, delta);
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}
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}
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public boolean hasComponentName(String packageName, String className) {
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return mComponentName.getPackageName().equals(packageName)
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&& mComponentName.getClassName().equals(className);
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}
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public String getFlattenedComponentName() {
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return mComponentName.flattenToShortString();
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}
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public void start() {
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if (!mRunning) {
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if (DEBUG) {
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Slog.d(TAG, this + ": Starting");
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}
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mRunning = true;
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updateBinding();
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}
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}
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public void stop() {
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if (mRunning) {
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if (DEBUG) {
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Slog.d(TAG, this + ": Stopping");
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}
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mRunning = false;
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updateBinding();
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}
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}
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public void rebindIfDisconnected() {
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if (mActiveConnection == null && shouldBind()) {
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unbind();
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bind();
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}
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}
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private void updateBinding() {
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if (shouldBind()) {
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bind();
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} else {
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unbind();
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}
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}
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private boolean shouldBind() {
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if (mRunning) {
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// Bind whenever there is a discovery request or selected display.
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if (mDiscoveryMode != RemoteDisplayState.DISCOVERY_MODE_NONE
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|| mSelectedDisplayId != null) {
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return true;
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}
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}
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return false;
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}
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private void bind() {
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if (!mBound) {
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if (DEBUG) {
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Slog.d(TAG, this + ": Binding");
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}
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Intent service = new Intent(RemoteDisplayState.SERVICE_INTERFACE);
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service.setComponent(mComponentName);
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try {
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mBound = mContext.bindServiceAsUser(service, this,
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Context.BIND_AUTO_CREATE | Context.BIND_FOREGROUND_SERVICE,
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new UserHandle(mUserId));
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if (!mBound && DEBUG) {
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Slog.d(TAG, this + ": Bind failed");
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}
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} catch (SecurityException ex) {
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if (DEBUG) {
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Slog.d(TAG, this + ": Bind failed", ex);
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}
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}
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}
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}
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private void unbind() {
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if (mBound) {
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if (DEBUG) {
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Slog.d(TAG, this + ": Unbinding");
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}
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mBound = false;
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disconnect();
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mContext.unbindService(this);
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}
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}
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@Override
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public void onServiceConnected(ComponentName name, IBinder service) {
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if (DEBUG) {
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Slog.d(TAG, this + ": Connected");
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}
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if (mBound) {
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disconnect();
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IRemoteDisplayProvider provider = IRemoteDisplayProvider.Stub.asInterface(service);
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if (provider != null) {
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Connection connection = new Connection(provider);
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if (connection.register()) {
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mActiveConnection = connection;
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} else {
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if (DEBUG) {
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Slog.d(TAG, this + ": Registration failed");
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}
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}
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} else {
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Slog.e(TAG, this + ": Service returned invalid remote display provider binder");
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}
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}
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}
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@Override
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public void onServiceDisconnected(ComponentName name) {
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if (DEBUG) {
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Slog.d(TAG, this + ": Service disconnected");
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}
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disconnect();
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}
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private void onConnectionReady(Connection connection) {
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if (mActiveConnection == connection) {
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mConnectionReady = true;
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if (mDiscoveryMode != RemoteDisplayState.DISCOVERY_MODE_NONE) {
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mActiveConnection.setDiscoveryMode(mDiscoveryMode);
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}
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if (mSelectedDisplayId != null) {
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mActiveConnection.connect(mSelectedDisplayId);
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}
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}
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}
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private void onConnectionDied(Connection connection) {
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if (mActiveConnection == connection) {
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if (DEBUG) {
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Slog.d(TAG, this + ": Service connection died");
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}
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disconnect();
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}
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}
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private void onDisplayStateChanged(Connection connection, RemoteDisplayState state) {
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if (mActiveConnection == connection) {
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if (DEBUG) {
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Slog.d(TAG, this + ": State changed, state=" + state);
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}
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setDisplayState(state);
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}
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}
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private void disconnect() {
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if (mActiveConnection != null) {
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if (mSelectedDisplayId != null) {
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mActiveConnection.disconnect(mSelectedDisplayId);
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}
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mConnectionReady = false;
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mActiveConnection.dispose();
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mActiveConnection = null;
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setDisplayState(null);
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}
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}
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private void setDisplayState(RemoteDisplayState state) {
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if (!Objects.equals(mDisplayState, state)) {
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mDisplayState = state;
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if (!mScheduledDisplayStateChangedCallback) {
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mScheduledDisplayStateChangedCallback = true;
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mHandler.post(mDisplayStateChanged);
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}
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}
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}
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@Override
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public String toString() {
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return "Service connection " + mComponentName.flattenToShortString();
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}
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private final Runnable mDisplayStateChanged = new Runnable() {
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@Override
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public void run() {
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mScheduledDisplayStateChangedCallback = false;
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if (mDisplayStateCallback != null) {
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mDisplayStateCallback.onDisplayStateChanged(
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RemoteDisplayProviderProxy.this, mDisplayState);
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}
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}
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};
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public interface Callback {
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void onDisplayStateChanged(RemoteDisplayProviderProxy provider, RemoteDisplayState state);
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}
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private final class Connection implements DeathRecipient {
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private final IRemoteDisplayProvider mProvider;
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private final ProviderCallback mCallback;
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public Connection(IRemoteDisplayProvider provider) {
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mProvider = provider;
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mCallback = new ProviderCallback(this);
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}
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public boolean register() {
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try {
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mProvider.asBinder().linkToDeath(this, 0);
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mProvider.setCallback(mCallback);
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mHandler.post(new Runnable() {
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@Override
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public void run() {
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onConnectionReady(Connection.this);
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}
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});
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return true;
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} catch (RemoteException ex) {
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binderDied();
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}
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return false;
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}
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public void dispose() {
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mProvider.asBinder().unlinkToDeath(this, 0);
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mCallback.dispose();
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}
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public void setDiscoveryMode(int mode) {
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try {
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mProvider.setDiscoveryMode(mode);
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} catch (RemoteException ex) {
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Slog.e(TAG, "Failed to deliver request to set discovery mode.", ex);
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}
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}
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public void connect(String id) {
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try {
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mProvider.connect(id);
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} catch (RemoteException ex) {
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Slog.e(TAG, "Failed to deliver request to connect to display.", ex);
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}
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}
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public void disconnect(String id) {
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try {
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mProvider.disconnect(id);
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} catch (RemoteException ex) {
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Slog.e(TAG, "Failed to deliver request to disconnect from display.", ex);
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}
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}
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public void setVolume(String id, int volume) {
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try {
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mProvider.setVolume(id, volume);
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} catch (RemoteException ex) {
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Slog.e(TAG, "Failed to deliver request to set display volume.", ex);
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}
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}
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public void adjustVolume(String id, int volume) {
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try {
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mProvider.adjustVolume(id, volume);
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} catch (RemoteException ex) {
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Slog.e(TAG, "Failed to deliver request to adjust display volume.", ex);
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}
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}
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@Override
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public void binderDied() {
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mHandler.post(new Runnable() {
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@Override
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public void run() {
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onConnectionDied(Connection.this);
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}
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});
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}
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void postStateChanged(final RemoteDisplayState state) {
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mHandler.post(new Runnable() {
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@Override
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public void run() {
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onDisplayStateChanged(Connection.this, state);
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}
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});
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}
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}
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/**
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* Receives callbacks from the service.
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* <p>
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* This inner class is static and only retains a weak reference to the connection
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* to prevent the client from being leaked in case the service is holding an
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* active reference to the client's callback.
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* </p>
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*/
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private static final class ProviderCallback extends IRemoteDisplayCallback.Stub {
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private final WeakReference<Connection> mConnectionRef;
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public ProviderCallback(Connection connection) {
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mConnectionRef = new WeakReference<Connection>(connection);
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}
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public void dispose() {
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mConnectionRef.clear();
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}
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@Override
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public void onStateChanged(RemoteDisplayState state) throws RemoteException {
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Connection connection = mConnectionRef.get();
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if (connection != null) {
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connection.postStateChanged(state);
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}
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}
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}
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}
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