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      1 /*
      2  * Copyright (C) 2007 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.ddm;
     18 
     19 import org.apache.harmony.dalvik.ddmc.Chunk;
     20 import org.apache.harmony.dalvik.ddmc.ChunkHandler;
     21 import org.apache.harmony.dalvik.ddmc.DdmServer;
     22 import android.util.Log;
     23 import java.nio.ByteBuffer;
     24 
     25 /**
     26  * Handle thread-related traffic.
     27  */
     28 public class DdmHandleNativeHeap extends ChunkHandler {
     29 
     30     public static final int CHUNK_NHGT = type("NHGT");
     31 
     32     private static DdmHandleNativeHeap mInstance = new DdmHandleNativeHeap();
     33 
     34 
     35     /* singleton, do not instantiate */
     36     private DdmHandleNativeHeap() {}
     37 
     38     /**
     39      * Register for the messages we're interested in.
     40      */
     41     public static void register() {
     42         DdmServer.registerHandler(CHUNK_NHGT, mInstance);
     43     }
     44 
     45     /**
     46      * Called when the DDM server connects.  The handler is allowed to
     47      * send messages to the server.
     48      */
     49     public void connected() {}
     50 
     51     /**
     52      * Called when the DDM server disconnects.  Can be used to disable
     53      * periodic transmissions or clean up saved state.
     54      */
     55     public void disconnected() {}
     56 
     57     /**
     58      * Handle a chunk of data.
     59      */
     60     public Chunk handleChunk(Chunk request) {
     61         Log.i("ddm-nativeheap", "Handling " + name(request.type) + " chunk");
     62         int type = request.type;
     63 
     64         if (type == CHUNK_NHGT) {
     65             return handleNHGT(request);
     66         } else {
     67             throw new RuntimeException("Unknown packet "
     68                 + ChunkHandler.name(type));
     69         }
     70     }
     71 
     72     /*
     73      * Handle a "Native Heap GeT" request.
     74      */
     75     private Chunk handleNHGT(Chunk request) {
     76         //ByteBuffer in = wrapChunk(request);
     77 
     78         byte[] data = getLeakInfo();
     79 
     80         if (data != null) {
     81             // wrap & return
     82             Log.i("ddm-nativeheap", "Sending " + data.length + " bytes");
     83             return new Chunk(ChunkHandler.type("NHGT"), data, 0, data.length);
     84         } else {
     85             // failed, return a failure error code and message
     86             return createFailChunk(1, "Something went wrong");
     87         }
     88     }
     89 
     90     private native byte[] getLeakInfo();
     91 }
     92 
     93