1 /*
2  * Copyright (C) 2016 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package com.android.server.wifi.util;
18 
19 import android.annotation.NonNull;
20 import android.os.Handler;
21 import android.os.Looper;
22 import android.os.Message;
23 
24 import com.android.internal.annotations.VisibleForTesting;
25 import com.android.server.wifi.WifiInjector;
26 import com.android.server.wifi.WifiLog;
27 
28 /**
29  * This class subclasses Handler to log incoming messages
30  */
31 public class WifiHandler extends Handler {
32     private static final String LOG_TAG = "WifiHandler";
33     private WifiLog mLog;
34     private String mTag;
35 
WifiHandler(String tag, Looper looper)36     public WifiHandler(String tag, Looper looper) {
37         super(looper);
38         mTag = LOG_TAG + "." + tag;
39     }
40 
41     @NonNull
getOrInitLog()42     private WifiLog getOrInitLog() {
43         // Lazy initialization of mLog
44         if (mLog == null) {
45             mLog = WifiInjector.getInstance().makeLog(mTag);
46         }
47         return mLog;
48     }
49 
50     @Override
handleMessage(Message msg)51     public void handleMessage(Message msg) {
52         getOrInitLog().trace("Received message=% sendingUid=%")
53                 .c(msg.what)
54                 .c(msg.sendingUid)
55                 .flush();
56     }
57 
58     /**
59      * @hide
60      */
61     @VisibleForTesting
setWifiLog(WifiLog wifiLog)62     public void setWifiLog(WifiLog wifiLog) {
63         // TODO WifiInjector should be passed as a variable in the constructor
64         // b/33308811 tracks removing lazy initializations of mLog
65         mLog = wifiLog;
66     }
67 }
68