| /* |
| * 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 com.googlecode.android_scripting.service; |
| |
| import android.annotation.TargetApi; |
| import android.os.Bundle; |
| import android.os.Handler; |
| import android.os.HandlerThread; |
| import android.os.Message; |
| import android.os.RemoteException; |
| |
| import com.googlecode.android_scripting.Log; |
| import com.googlecode.android_scripting.jsonrpc.JsonRpcResult; |
| import com.googlecode.android_scripting.jsonrpc.RpcReceiverManager; |
| import com.googlecode.android_scripting.jsonrpc.RpcReceiverManagerFactory; |
| import com.googlecode.android_scripting.rpc.MethodDescriptor; |
| |
| import org.json.JSONException; |
| import org.json.JSONObject; |
| |
| /** |
| * Class responsible for Handling messages that came through the FacadeService |
| * interface. |
| * <br> |
| * Please refer to {@link FacadeService} for details on how to use. |
| */ |
| @TargetApi(3) |
| public class MessageHandler extends Handler { |
| |
| private static final int SL4A_ACTION = 0; |
| private static final int DEFAULT_SENDING_ID = 0; |
| |
| // Android sets this to -1 when the message is not sent by a Messenger. |
| // see http://developer.android.com/reference/android/os/Message.html#sendingUid |
| private static final int DEFAULT_UNSET_SENDING_ID = 1; |
| |
| // Keys for the Bundles. |
| private static final String SL4A_METHOD = "sl4aMethod"; |
| private static final String SL4A_RESULT = "sl4aResult"; |
| |
| private final RpcReceiverManagerFactory mRpcReceiverManagerFactory; |
| |
| public MessageHandler(HandlerThread handlerThread, |
| RpcReceiverManagerFactory rpcReceiverManagerFactory) { |
| super(handlerThread.getLooper()); |
| this.mRpcReceiverManagerFactory = rpcReceiverManagerFactory; |
| } |
| |
| /** |
| * Handles messages for the service. It does this via the same mechanism used |
| * for RPCs through RpcManagers. |
| * |
| * @param message The message that contains the method and parameters to |
| * execute. |
| */ |
| @Override |
| public void handleMessage(Message message) { |
| Log.d("Handling Remote request"); |
| int senderId = message.sendingUid == DEFAULT_UNSET_SENDING_ID ? |
| DEFAULT_SENDING_ID : message.sendingUid; |
| String sessionId = "" + senderId; |
| if (message.what == SL4A_ACTION) { |
| RpcReceiverManager receiverManager; |
| if (mRpcReceiverManagerFactory.getRpcReceiverManagers().containsKey(sessionId)) { |
| receiverManager = |
| mRpcReceiverManagerFactory.getRpcReceiverManagers().get(sessionId); |
| } else { |
| receiverManager = mRpcReceiverManagerFactory.create(sessionId); |
| } |
| Bundle sl4aRequest = message.getData(); |
| String method = sl4aRequest.getString(SL4A_METHOD); |
| if (method == null || "".equals(method)) { |
| Log.e("No SL4A method specified on the Bundle. Specify one with " |
| + SL4A_METHOD); |
| return; |
| } |
| MethodDescriptor rpc = receiverManager.getMethodDescriptor(method); |
| if (rpc == null) { |
| Log.e("Unknown RPC: \"" + method + "\""); |
| return; |
| } |
| try { |
| Log.d("Invoking method " + rpc.getName()); |
| Object result = rpc.invoke(receiverManager, sl4aRequest); |
| // Only return a result if we were passed a Messenger. Otherwise assume |
| // client did not care for the response. |
| if (message.replyTo != null) { |
| Message reply = Message.obtain(); |
| Bundle sl4aResponse = new Bundle(); |
| putResult(senderId, result, sl4aResponse); |
| reply.setData(sl4aResponse); |
| message.replyTo.send(reply); |
| } |
| } catch (RemoteException e) { |
| Log.e("Could not send reply back to client", e); |
| } catch (Throwable t) { |
| Log.e("Exception while executing sl4a method", t); |
| } |
| } |
| } |
| |
| private void putResult(int id, Object result, Bundle reply) { |
| JSONObject json; |
| try { |
| if (result instanceof Throwable) { |
| json = JsonRpcResult.error(id, (Throwable) result); |
| } else { |
| json = JsonRpcResult.result(id, result); |
| } |
| } catch (JSONException e) { |
| // There was an error converting the result to JSON. This shouldn't |
| // happen normally. |
| Log.e("Caught exception when filling JSON result.", e); |
| reply.putString(SL4A_RESULT, e.toString()); |
| return; |
| } |
| Log.d("Returning result: " + json.toString()); |
| reply.putString(SL4A_RESULT, json.toString()); |
| } |
| } |