content: /*
   * Copyright (C) 2015 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 android.os;
  
  import android.util.Log;
  import android.util.Size;
  import com.android.internal.util.FastPrintWriter;
  
  import java.io.FileOutputStream;
  import java.io.PrintWriter;
  import java.util.HashMap;
  import java.util.Map;
  
  /**
   * Class used to track binder transactions. It indexes the transactions by the stack trace.
   *
   * @hide
   */
  public class TransactionTracker {
      private Map<String, Long> mTraces;
  
      private void resetTraces() {
          synchronized (this) {
              mTraces = new HashMap<String, Long>();
          }
      }
  
      TransactionTracker() {
          resetTraces();
      }
  
      public void addTrace(Throwable tr) {
          String trace = Log.getStackTraceString(tr);
          synchronized (this) {
              if (mTraces.containsKey(trace)) {
                  mTraces.put(trace, mTraces.get(trace) + 1);
              } else {
                  mTraces.put(trace, Long.valueOf(1));
              }
          }
      }
  
      public void writeTracesToFile(ParcelFileDescriptor fd) {
          if (mTraces.isEmpty()) {
              return;
          }
  
          PrintWriter pw = new FastPrintWriter(new FileOutputStream(fd.getFileDescriptor()));
          synchronized (this) {
              for (String trace : mTraces.keySet()) {
                  pw.println("Count: " + mTraces.get(trace));
                  pw.println("Trace: " + trace);
                  pw.println();
              }
          }
          pw.flush();
      }
  
      public void clearTraces(){
          resetTraces();
      }
  }
  