Home | History | Annotate | Download | only in systrace 
      1 /*
      2  * Copyright (C) 2012 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.ide.eclipse.ddms.systrace;
     18 
     19 import com.android.ddmlib.IDevice;
     20 import com.android.ddmlib.IShellOutputReceiver;
     21 import com.google.common.primitives.Bytes;
     22 
     23 public class SystraceTask implements Runnable {
     24     private final IDevice mDevice;
     25     private final String mOptions;
     26 
     27     private volatile boolean mCancel;
     28 
     29     private final Object mLock = new Object();
     30     private String errorMessage;
     31     private boolean mTraceComplete;
     32     private byte[] mBuffer = new byte[1024];
     33     private int mDataLength = 0;
     34 
     35     public SystraceTask(IDevice device, String options) {
     36         mDevice = device;
     37         mOptions = options;
     38     }
     39 
     40     @Override
     41     public void run() {
     42         try {
     43             mDevice.executeShellCommand("atrace " + mOptions, new Receiver(), 0);
     44         } catch (Exception e) {
     45             synchronized (mLock) {
     46                 errorMessage = "Unexpected error while running atrace on device: " + e;
     47             }
     48         }
     49     }
     50 
     51     public void cancel() {
     52         mCancel = true;
     53     }
     54 
     55     public String getError() {
     56         synchronized (mLock) {
     57             return errorMessage;
     58         }
     59     }
     60 
     61     public byte[] getAtraceOutput() {
     62         synchronized (mLock) {
     63             return mTraceComplete ? mBuffer : null;
     64         }
     65     }
     66 
     67     private class Receiver implements IShellOutputReceiver {
     68         @Override
     69         public void addOutput(byte[] data, int offset, int length) {
     70             synchronized (mLock) {
     71                 if (mDataLength + length > mBuffer.length) {
     72                     mBuffer = Bytes.ensureCapacity(mBuffer, mDataLength + length + 1, 1024);
     73                 }
     74 
     75                 for (int i = 0; i < length; i++) {
     76                     mBuffer[mDataLength + i] = data[offset + i];
     77                 }
     78                 mDataLength += length;
     79             }
     80         }
     81 
     82         @Override
     83         public void flush() {
     84             synchronized (mLock) {
     85                 // trim mBuffer to its final size
     86                 byte[] copy = new byte[mDataLength];
     87                 for (int i = 0; i < mDataLength; i++) {
     88                     copy[i] = mBuffer[i];
     89                 }
     90                 mBuffer = copy;
     91 
     92                 mTraceComplete = true;
     93             }
     94         }
     95 
     96         @Override
     97         public boolean isCancelled() {
     98             return mCancel;
     99         }
    100     }
    101 }
    102