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/*
* Copyright (C) 2016 The CyanogenMod 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 lineageos.preference;
import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.os.Handler;
import android.os.HandlerThread;
import android.os.Looper;
import android.os.UserHandle;
import android.util.ArrayMap;
import android.util.Log;
import java.util.HashSet;
import java.util.Map;
import java.util.Objects;
import java.util.Set;
import lineageos.platform.Manifest;
import static lineageos.preference.RemotePreference.ACTION_REFRESH_PREFERENCE;
import static lineageos.preference.RemotePreference.ACTION_UPDATE_PREFERENCE;
import static lineageos.preference.RemotePreference.EXTRA_KEY;
/**
* Manages attaching and detaching of RemotePreferences and optimizes callbacks
* thru a single receiver on a separate thread.
*
* @hide
*/
public class RemotePreferenceManager {
private static final String TAG = RemotePreferenceManager.class.getSimpleName();
private static final boolean DEBUG = Log.isLoggable(
RemotePreference.class.getSimpleName(), Log.VERBOSE);
private static RemotePreferenceManager sInstance;
private final Context mContext;
private final Map<String, Intent> mCache = new ArrayMap<>();
private final Map<String, Set<OnRemoteUpdateListener>> mCallbacks = new ArrayMap<>();
private final Handler mMainHandler = new Handler(Looper.getMainLooper());
private Handler mHandler;
private HandlerThread mThread;
public interface OnRemoteUpdateListener {
public Intent getReceiverIntent();
public void onRemoteUpdated(Bundle bundle);
}
private RemotePreferenceManager(Context context) {
mContext = context;
}
public synchronized static RemotePreferenceManager get(Context context) {
if (sInstance == null) {
sInstance = new RemotePreferenceManager(context.getApplicationContext());
}
return sInstance;
}
public void attach(String key, OnRemoteUpdateListener pref) {
Intent i;
synchronized (mCache) {
i = mCache.get(key);
if (i == null && !mCache.containsKey(key)) {
i = pref.getReceiverIntent();
mCache.put(key, i);
}
}
synchronized (mCallbacks) {
if (i != null) {
Set<OnRemoteUpdateListener> cbs = mCallbacks.get(key);
if (cbs == null) {
cbs = new HashSet<>();
mCallbacks.put(key, cbs);
if (mCallbacks.size() == 1) {
mThread = new HandlerThread("RemotePreference");
mThread.start();
mHandler = new Handler(mThread.getLooper());
mContext.registerReceiver(mListener,
new IntentFilter(ACTION_REFRESH_PREFERENCE),
Manifest.permission.MANAGE_REMOTE_PREFERENCES, mHandler);
}
}
cbs.add(pref);
requestUpdate(key);
}
}
}
public void detach(String key, OnRemoteUpdateListener pref) {
synchronized (mCallbacks) {
Set<OnRemoteUpdateListener> cbs = mCallbacks.get(key);
if (cbs != null && cbs.remove(pref) && cbs.isEmpty()
&& mCallbacks.remove(key) != null && mCallbacks.isEmpty()) {
mContext.unregisterReceiver(mListener);
if (mThread != null) {
mThread.quit();
mThread = null;
}
mHandler = null;
}
}
}
private void requestUpdate(String key) {
synchronized (mCache) {
Intent i = mCache.get(key);
if (i == null) {
return;
}
mContext.sendOrderedBroadcastAsUser(i, UserHandle.CURRENT,
Manifest.permission.MANAGE_REMOTE_PREFERENCES,
mListener, mHandler, Activity.RESULT_OK, null, null);
}
}
private final BroadcastReceiver mListener = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
if (DEBUG) Log.d(TAG, "onReceive: intent=" + Objects.toString(intent));
if (ACTION_REFRESH_PREFERENCE.equals(intent.getAction())) {
final String key = intent.getStringExtra(EXTRA_KEY);
synchronized (mCallbacks) {
if (key != null && mCallbacks.containsKey(key)) {
requestUpdate(key);
}
}
} else if (ACTION_UPDATE_PREFERENCE.equals(intent.getAction())) {
if (getAbortBroadcast()) {
Log.e(TAG, "Broadcast aborted, code=" + getResultCode());
return;
}
final Bundle bundle = getResultExtras(true);
final String key = bundle.getString(EXTRA_KEY);
synchronized (mCallbacks) {
if (key != null && mCallbacks.containsKey(key)) {
mMainHandler.post(new Runnable() {
@Override
public void run() {
synchronized (mCallbacks) {
if (mCallbacks.containsKey(key)) {
Set<OnRemoteUpdateListener> cbs = mCallbacks.get(key);
if (cbs != null) {
for (OnRemoteUpdateListener cb : cbs) {
cb.onRemoteUpdated(bundle);
}
}
}
}
}
});
}
}
}
}
};
}
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