110 lines
4.1 KiB
Java
110 lines
4.1 KiB
Java
/*
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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 android.telecomm;
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import android.app.Service;
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import android.content.Intent;
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import android.os.Handler;
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import android.os.IBinder;
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import android.os.Message;
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import com.android.internal.telecomm.ICallServiceLookupResponse;
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import com.android.internal.telecomm.ICallServiceProvider;
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/**
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* Base implementation of a call service provider which extends {@link Service}. This class
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* should be extended by an app that wants to supply phone calls to be handled and managed by
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* the device's in-call interface. All method-calls from the framework to the call service provider
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* are passed through to the main thread for before executing the overriden methods of
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* CallServiceProvider.
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*
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* TODO(santoscordon): Improve paragraph above once the final design is in place. Needs more
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* about how this can be used.
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*/
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public abstract class CallServiceProvider extends Service {
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/**
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* Default Handler used to consolidate binder method calls onto a single thread.
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*/
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private final class CallServiceProviderMessageHandler extends Handler {
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@Override
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public void handleMessage(Message msg) {
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switch (msg.what) {
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case MSG_LOOKUP_CALL_SERVICES:
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CallServiceLookupResponse response =
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new CallServiceLookupResponse((ICallServiceLookupResponse) msg.obj);
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lookupCallServices(response);
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break;
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}
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}
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}
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/**
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* Default ICallServiceProvider implementation provided to CallsManager via {@link #onBind}.
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*/
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private final class CallServiceProviderWrapper extends ICallServiceProvider.Stub {
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/** {@inheritDoc} */
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@Override
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public void lookupCallServices(ICallServiceLookupResponse callServiceLookupResponse) {
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Message message = mMessageHandler.obtainMessage(
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MSG_LOOKUP_CALL_SERVICES, callServiceLookupResponse);
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message.sendToTarget();
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}
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}
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// Only used internally by this class.
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// Binder method calls on this service can occur on multiple threads. These messages are used
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// in conjunction with {@link #mMessageHandler} to ensure that all callbacks are handled on a
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// single thread. Keeping it on a single thread allows CallService implementations to avoid
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// needing multi-threaded code in their own callback routines.
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private static final int MSG_LOOKUP_CALL_SERVICES = 1;
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/**
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* Message handler for consolidating binder callbacks onto a single thread.
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* See {@link CallServiceProviderMessageHandler}.
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*/
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private final CallServiceProviderMessageHandler mMessageHandler;
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/**
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* Default binder implementation of {@link ICallServiceProvider} interface.
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*/
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private final CallServiceProviderWrapper mBinder;
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/**
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* Protected constructor called only by subclasses creates the binder interface and
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* single-threaded message handler.
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*/
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protected CallServiceProvider() {
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mMessageHandler = new CallServiceProviderMessageHandler();
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mBinder = new CallServiceProviderWrapper();
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}
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/** {@inheritDoc} */
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@Override
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public IBinder onBind(Intent intent) {
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return mBinder;
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}
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/**
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* Initiates the process to retrieve the list of {@link CallServiceDescriptor}s implemented by
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* this provider.
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*
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* @param response The response object through which the list of call services is sent.
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*/
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public abstract void lookupCallServices(CallServiceLookupResponse response);
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}
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