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      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 
     36     private void resetTraces() {
     37         synchronized (this) {
     38             mTraces = new HashMap<String, Long>();
     39         }
     40     }
     41 
     42     TransactionTracker() {
     43         resetTraces();
     44     }
     45 
     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 
     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 
     73     public void clearTraces(){
     74         resetTraces();
     75     }
     76 }
     77