1 /*
2  * Copyright (C) 2015 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 android.os;
18 
19 import android.util.Log;
20 import android.util.Size;
21 import com.android.internal.util.FastPrintWriter;
22 
23 import java.io.FileOutputStream;
24 import java.io.PrintWriter;
25 import java.util.HashMap;
26 import java.util.Map;
27 
28 /**
29  * Class used to track binder transactions. It indexes the transactions by the stack trace.
30  *
31  * @hide
32  */
33 public class TransactionTracker {
34     private Map<String, Long> mTraces;
35 
resetTraces()36     private void resetTraces() {
37         synchronized (this) {
38             mTraces = new HashMap<String, Long>();
39         }
40     }
41 
TransactionTracker()42     TransactionTracker() {
43         resetTraces();
44     }
45 
addTrace()46     public void addTrace() {
47         String trace = Log.getStackTraceString(new Throwable());
48         synchronized (this) {
49             if (mTraces.containsKey(trace)) {
50                 mTraces.put(trace, mTraces.get(trace) + 1);
51             } else {
52                 mTraces.put(trace, Long.valueOf(1));
53             }
54         }
55     }
56 
writeTracesToFile(ParcelFileDescriptor fd)57     public void writeTracesToFile(ParcelFileDescriptor fd) {
58         if (mTraces.isEmpty()) {
59             return;
60         }
61 
62         PrintWriter pw = new FastPrintWriter(new FileOutputStream(fd.getFileDescriptor()));
63         synchronized (this) {
64             for (String trace : mTraces.keySet()) {
65                 pw.println("Count: " + mTraces.get(trace));
66                 pw.println("Trace: " + trace);
67                 pw.println();
68             }
69         }
70         pw.flush();
71     }
72 
clearTraces()73     public void clearTraces(){
74         resetTraces();
75     }
76 }
77