content: /*
   * Copyright (C) 2016 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.wifi.util;
  
  import android.annotation.NonNull;
  import android.os.Message;
  
  import com.android.internal.annotations.VisibleForTesting;
  import com.android.internal.util.AsyncChannel;
  import com.android.server.wifi.WifiInjector;
  import com.android.server.wifi.WifiLog;
  
  /**
   * This class subclasses AsyncChannel and adds logging
   * to the sendMessage() API
   */
  public class WifiAsyncChannel extends AsyncChannel {
      private static final String LOG_TAG = "WifiAsyncChannel";
      private WifiLog mLog;
      private String mTag;
      /**
       * AsyncChannelWithLogging constructor
       */
      public WifiAsyncChannel(String serviceTag) {
          mTag = LOG_TAG + "." + serviceTag;
      }
  
      @NonNull
      private WifiLog getOrInitLog() {
          // Lazy initization of mLog
          if (mLog == null) {
              mLog = WifiInjector.getInstance().makeLog(mTag);
          }
          return mLog;
      }
  
      /**
       * Send a message to the destination handler.
       *
       * @param msg
       */
      @Override
      public void sendMessage(Message msg) {
          getOrInitLog().trace("sendMessage message=%")
              .c(msg.what)
              .flush();
          super.sendMessage(msg);
      }
  
      /**
       * Reply to srcMsg
       *
       * @param srcMsg
       * @param dstMsg
       */
      @Override
      public void replyToMessage(Message srcMsg, Message dstMsg) {
          getOrInitLog()
                  .trace("replyToMessage recvdMessage=% sendingUid=% sentMessage=%")
                  .c(srcMsg.what)
                  .c(srcMsg.sendingUid)
                  .c(dstMsg.what)
                  .flush();
          super.replyToMessage(srcMsg, dstMsg);
      }
  
      /**
       * Send the Message synchronously.
       *
       * @param msg to send
       * @return reply message or null if an error.
       */
      @Override
      public Message sendMessageSynchronously(Message msg) {
          getOrInitLog().trace("sendMessageSynchronously.send message=%")
              .c(msg.what)
              .flush();
          Message replyMessage = super.sendMessageSynchronously(msg);
          if (replyMessage != null) {
              getOrInitLog().trace("sendMessageSynchronously.recv message=% sendingUid=%")
                      .c(replyMessage.what)
                      .c(replyMessage.sendingUid)
                      .flush();
          }
          return replyMessage;
      }
  
      @VisibleForTesting
      public void setWifiLog(WifiLog log) {
          mLog = log;
      }
  }
  