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Android example source code file (DdmHandleProfiling.java)

This example Android source code file (DdmHandleProfiling.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, bytebuffer, chunk, chunk_mpre, chunk_mprq, chunk_mprs, chunk_mpse, chunk_mpss, chunkhandler, ddmhandleprofiling, handling, io, method, os, runtimeexception, string, unknown, util, utilities, utils

The DdmHandleProfiling.java Android example source code

/*
 * Copyright (C) 2009 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.os.Debug;
import android.util.Config;
import android.util.Log;
import java.io.IOException;
import java.nio.ByteBuffer;

/**
 * Handle profiling requests.
 */
public class DdmHandleProfiling extends ChunkHandler {

    public static final int CHUNK_MPRS = type("MPRS");
    public static final int CHUNK_MPRE = type("MPRE");
    public static final int CHUNK_MPSS = type("MPSS");
    public static final int CHUNK_MPSE = type("MPSE");
    public static final int CHUNK_MPRQ = type("MPRQ");

    private static DdmHandleProfiling mInstance = new DdmHandleProfiling();


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

    /**
     * Register for the messages we're interested in.
     */
    public static void register() {
        DdmServer.registerHandler(CHUNK_MPRS, mInstance);
        DdmServer.registerHandler(CHUNK_MPRE, mInstance);
        DdmServer.registerHandler(CHUNK_MPSS, mInstance);
        DdmServer.registerHandler(CHUNK_MPSE, mInstance);
        DdmServer.registerHandler(CHUNK_MPRQ, 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) {
        if (Config.LOGV)
            Log.v("ddm-heap", "Handling " + name(request.type) + " chunk");
        int type = request.type;

        if (type == CHUNK_MPRS) {
            return handleMPRS(request);
        } else if (type == CHUNK_MPRE) {
            return handleMPRE(request);
        } else if (type == CHUNK_MPSS) {
            return handleMPSS(request);
        } else if (type == CHUNK_MPSE) {
            return handleMPSE(request);
        } else if (type == CHUNK_MPRQ) {
            return handleMPRQ(request);
        } else {
            throw new RuntimeException("Unknown packet "
                + ChunkHandler.name(type));
        }
    }

    /*
     * Handle a "Method PRofiling Start" request.
     */
    private Chunk handleMPRS(Chunk request) {
        ByteBuffer in = wrapChunk(request);

        int bufferSize = in.getInt();
        int flags = in.getInt();
        int len = in.getInt();
        String fileName = getString(in, len);
        if (Config.LOGV)
            Log.v("ddm-heap", "Method profiling start: filename='" + fileName
                + "', size=" + bufferSize + ", flags=" + flags);

        try {
            Debug.startMethodTracing(fileName, bufferSize, flags);
            return null;        // empty response
        } catch (RuntimeException re) {
            return createFailChunk(1, re.getMessage());
        }
    }

    /*
     * Handle a "Method PRofiling End" request.
     */
    private Chunk handleMPRE(Chunk request) {
        byte result;

        try {
            Debug.stopMethodTracing();
            result = 0;
        } catch (RuntimeException re) {
            Log.w("ddm-heap", "Method profiling end failed: "
                + re.getMessage());
            result = 1;
        }

        /* create a non-empty reply so the handler fires on completion */
        byte[] reply = { result };
        return new Chunk(CHUNK_MPRE, reply, 0, reply.length);
    }

    /*
     * Handle a "Method Profiling w/Streaming Start" request.
     */
    private Chunk handleMPSS(Chunk request) {
        ByteBuffer in = wrapChunk(request);

        int bufferSize = in.getInt();
        int flags = in.getInt();
        if (Config.LOGV) {
            Log.v("ddm-heap", "Method prof stream start: size=" + bufferSize
                + ", flags=" + flags);
        }

        try {
            Debug.startMethodTracingDdms(bufferSize, flags);
            return null;        // empty response
        } catch (RuntimeException re) {
            return createFailChunk(1, re.getMessage());
        }
    }

    /*
     * Handle a "Method Profiling w/Streaming End" request.
     */
    private Chunk handleMPSE(Chunk request) {
        byte result;

        if (Config.LOGV) {
            Log.v("ddm-heap", "Method prof stream end");
        }

        try {
            Debug.stopMethodTracing();
            result = 0;
        } catch (RuntimeException re) {
            Log.w("ddm-heap", "Method prof stream end failed: "
                + re.getMessage());
            return createFailChunk(1, re.getMessage());
        }

        /* VM sent the (perhaps very large) response directly */
        return null;
    }

    /*
     * Handle a "Method PRofiling Query" request.
     */
    private Chunk handleMPRQ(Chunk request) {
        int result = Debug.isMethodTracingActive() ? 1 : 0;

        /* create a non-empty reply so the handler fires on completion */
        byte[] reply = { (byte) result };
        return new Chunk(CHUNK_MPRQ, reply, 0, reply.length);
    }
}

Other Android examples (source code examples)

Here is a short list of links related to this Android DdmHandleProfiling.java source code file:

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