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/*
* Copyright (C) 2017 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 android.app.usage;
import android.annotation.SystemApi;
import android.app.Service;
import android.app.usage.ICacheQuotaService;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.IBinder;
import android.os.Looper;
import android.os.Message;
import android.os.RemoteCallback;
import android.util.Log;
import android.util.Pair;
import java.util.List;
/**
* CacheQuoteService defines a service which accepts cache quota requests and processes them,
* thereby filling out how much quota each request deserves.
* {@hide}
*/
@SystemApi
public abstract class CacheQuotaService extends Service {
private static final String TAG = "CacheQuotaService";
/**
* The {@link Intent} action that must be declared as handled by a service
* in its manifest for the system to recognize it as a quota providing service.
*/
public static final String SERVICE_INTERFACE = "android.app.usage.CacheQuotaService";
/** {@hide} **/
public static final String REQUEST_LIST_KEY = "requests";
private CacheQuotaServiceWrapper mWrapper;
private Handler mHandler;
@Override
public void onCreate() {
super.onCreate();
mWrapper = new CacheQuotaServiceWrapper();
mHandler = new ServiceHandler(getMainLooper());
}
@Override
public IBinder onBind(Intent intent) {
return mWrapper;
}
/**
* Processes the cache quota list upon receiving a list of requests.
* @param requests A list of cache quotas to fulfill.
* @return A completed list of cache quota requests.
*/
public abstract List<CacheQuotaHint> onComputeCacheQuotaHints(
List<CacheQuotaHint> requests);
private final class CacheQuotaServiceWrapper extends ICacheQuotaService.Stub {
@Override
public void computeCacheQuotaHints(
RemoteCallback callback, List<CacheQuotaHint> requests) {
final Pair<RemoteCallback, List<CacheQuotaHint>> pair =
Pair.create(callback, requests);
Message msg = mHandler.obtainMessage(ServiceHandler.MSG_SEND_LIST, pair);
mHandler.sendMessage(msg);
}
}
private final class ServiceHandler extends Handler {
public static final int MSG_SEND_LIST = 1;
public ServiceHandler(Looper looper) {
super(looper, null, true);
}
@Override
public void handleMessage(Message msg) {
final int action = msg.what;
switch (action) {
case MSG_SEND_LIST:
final Pair<RemoteCallback, List<CacheQuotaHint>> pair =
(Pair<RemoteCallback, List<CacheQuotaHint>>) msg.obj;
List<CacheQuotaHint> processed = onComputeCacheQuotaHints(pair.second);
final Bundle data = new Bundle();
data.putParcelableList(REQUEST_LIST_KEY, processed);
final RemoteCallback callback = pair.first;
callback.sendResult(data);
break;
default:
Log.w(TAG, "Handling unknown message: " + action);
}
}
}
}
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