Android example source code file (DdmHandleNativeHeap.java)

This example Android source code file (DdmHandleNativeHeap.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" ^TM.

Java - Android tags/keywords

android, chunk, chunk_nhgt, chunkhandler, ddmhandlenativeheap, handling, io, nhgt, nio, runtimeexception, sending, something, unknown, util, utilities, utils

The DdmHandleNativeHeap.java Android example source code

/*
 * Copyright (C) 2007 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.ddm;

import org.apache.harmony.dalvik.ddmc.Chunk;
import org.apache.harmony.dalvik.ddmc.ChunkHandler;
import org.apache.harmony.dalvik.ddmc.DdmServer;
import android.util.Log;
import java.nio.ByteBuffer;

/**
 * Handle thread-related traffic.
 */
public class DdmHandleNativeHeap extends ChunkHandler {

    public static final int CHUNK_NHGT = type("NHGT");

    private static DdmHandleNativeHeap mInstance = new DdmHandleNativeHeap();


    /* singleton, do not instantiate */
    private DdmHandleNativeHeap() {}

    /**
     * Register for the messages we're interested in.
     */
    public static void register() {
        DdmServer.registerHandler(CHUNK_NHGT, mInstance);
    }

    /**
     * Called when the DDM server connects.  The handler is allowed to
     * send messages to the server.
     */
    public void connected() {}

    /**
     * Called when the DDM server disconnects.  Can be used to disable
     * periodic transmissions or clean up saved state.
     */
    public void disconnected() {}

    /**
     * Handle a chunk of data.
     */
    public Chunk handleChunk(Chunk request) {
        Log.i("ddm-nativeheap", "Handling " + name(request.type) + " chunk");
        int type = request.type;

        if (type == CHUNK_NHGT) {
            return handleNHGT(request);
        } else {
            throw new RuntimeException("Unknown packet "
                + ChunkHandler.name(type));
        }
    }

    /*
     * Handle a "Native Heap GeT" request.
     */
    private Chunk handleNHGT(Chunk request) {
        //ByteBuffer in = wrapChunk(request);

        byte[] data = getLeakInfo();

        if (data != null) {
            // wrap & return
            Log.i("ddm-nativeheap", "Sending " + data.length + " bytes");
            return new Chunk(ChunkHandler.type("NHGT"), data, 0, data.length);
        } else {
            // failed, return a failure error code and message
            return createFailChunk(1, "Something went wrong");
        }
    }
    
    private native byte[] getLeakInfo();
}