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/*
* Copyright (C) 2012 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.server;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Binder;
import android.os.Handler;
import android.os.IBinder;
import android.os.RemoteException;
import android.os.IBinder.DeathRecipient;
import android.service.dreams.IDreamService;
import android.util.Slog;
import android.view.IWindowManager;
import android.view.WindowManager;
import android.view.WindowManagerGlobal;
import com.android.internal.util.DumpUtils;
import java.io.PrintWriter;
import java.util.NoSuchElementException;
/**
* Internal controller for starting and stopping the current dream and managing related state.
*
* Assumes all operations (except {@link #dump}) are called from a single thread.
*/
final class DreamController {
private static final boolean DEBUG = true;
private static final String TAG = DreamController.class.getSimpleName();
public interface Listener {
void onDreamStopped(boolean wasTest);
}
private final Context mContext;
private final IWindowManager mIWindowManager;
private final DeathRecipient mDeathRecipient;
private final ServiceConnection mServiceConnection;
private final Listener mListener;
private Handler mHandler;
private ComponentName mCurrentDreamComponent;
private IDreamService mCurrentDream;
private Binder mCurrentDreamToken;
private boolean mCurrentDreamIsTest;
public DreamController(Context context, DeathRecipient deathRecipient,
ServiceConnection serviceConnection, Listener listener) {
mContext = context;
mDeathRecipient = deathRecipient;
mServiceConnection = serviceConnection;
mListener = listener;
mIWindowManager = WindowManagerGlobal.getWindowManagerService();
}
public void setHandler(Handler handler) {
mHandler = handler;
}
public void dump(PrintWriter pw) {
if (mHandler== null || pw == null) {
return;
}
DumpUtils.dumpAsync(mHandler, new DumpUtils.Dump() {
@Override
public void dump(PrintWriter pw) {
pw.print(" component="); pw.println(mCurrentDreamComponent);
pw.print(" token="); pw.println(mCurrentDreamToken);
pw.print(" dream="); pw.println(mCurrentDream);
}
}, pw, 200);
}
public void start(ComponentName dream, boolean isTest) {
if (DEBUG) Slog.v(TAG, String.format("start(%s,%s)", dream, isTest));
if (mCurrentDreamComponent != null ) {
if (dream.equals(mCurrentDreamComponent) && isTest == mCurrentDreamIsTest) {
if (DEBUG) Slog.v(TAG, "Dream is already started: " + dream);
return;
}
// stop the current dream before starting a new one
stop();
}
mCurrentDreamComponent = dream;
mCurrentDreamIsTest = isTest;
mCurrentDreamToken = new Binder();
try {
if (DEBUG) Slog.v(TAG, "Adding window token: " + mCurrentDreamToken
+ " for window type: " + WindowManager.LayoutParams.TYPE_DREAM);
mIWindowManager.addWindowToken(mCurrentDreamToken,
WindowManager.LayoutParams.TYPE_DREAM);
} catch (RemoteException e) {
Slog.w(TAG, "Unable to add window token.");
stop();
return;
}
Intent intent = new Intent(Intent.ACTION_MAIN)
.setComponent(mCurrentDreamComponent)
.addFlags(Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS)
.putExtra("android.dreams.TEST", mCurrentDreamIsTest);
if (!mContext.bindService(intent, mServiceConnection, Context.BIND_AUTO_CREATE)) {
Slog.w(TAG, "Unable to bind service");
stop();
return;
}
if (DEBUG) Slog.v(TAG, "Bound service");
}
public void attach(ComponentName name, IBinder dream) {
if (DEBUG) Slog.v(TAG, String.format("attach(%s,%s)", name, dream));
mCurrentDream = IDreamService.Stub.asInterface(dream);
boolean linked = linkDeathRecipient(dream);
if (!linked) {
stop();
return;
}
try {
if (DEBUG) Slog.v(TAG, "Attaching with token:" + mCurrentDreamToken);
mCurrentDream.attach(mCurrentDreamToken);
} catch (Throwable ex) {
Slog.w(TAG, "Unable to send window token to dream:" + ex);
stop();
}
}
public void stop() {
if (DEBUG) Slog.v(TAG, "stop()");
if (mCurrentDream != null) {
unlinkDeathRecipient(mCurrentDream.asBinder());
if (DEBUG) Slog.v(TAG, "Unbinding: " + mCurrentDreamComponent + " service: " + mCurrentDream);
mContext.unbindService(mServiceConnection);
}
if (mCurrentDreamToken != null) {
removeWindowToken(mCurrentDreamToken);
}
final boolean wasTest = mCurrentDreamIsTest;
mCurrentDream = null;
mCurrentDreamToken = null;
mCurrentDreamComponent = null;
mCurrentDreamIsTest = false;
if (mListener != null && mHandler != null) {
mHandler.post(new Runnable(){
@Override
public void run() {
mListener.onDreamStopped(wasTest);
}});
}
}
public void stopSelf(IBinder token) {
if (DEBUG) Slog.v(TAG, String.format("stopSelf(%s)", token));
if (token == null || token != mCurrentDreamToken) {
Slog.w(TAG, "Stop requested for non-current dream token: " + token);
} else {
stop();
}
}
private void removeWindowToken(IBinder token) {
if (DEBUG) Slog.v(TAG, "Removing window token: " + token);
try {
mIWindowManager.removeWindowToken(token);
} catch (Throwable e) {
Slog.w(TAG, "Error removing window token", e);
}
}
private boolean linkDeathRecipient(IBinder dream) {
if (DEBUG) Slog.v(TAG, "Linking death recipient");
try {
dream.linkToDeath(mDeathRecipient, 0);
return true;
} catch (RemoteException e) {
Slog.w(TAG, "Unable to link death recipient", e);
return false;
}
}
private void unlinkDeathRecipient(IBinder dream) {
if (DEBUG) Slog.v(TAG, "Unlinking death recipient");
try {
dream.unlinkToDeath(mDeathRecipient, 0);
} catch (NoSuchElementException e) {
// we tried
}
}
}
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