com.onion.master.MasterBlockWriter.java Source code

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Here is the source code for com.onion.master.MasterBlockWriter.java

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/*
 * Licensed to the University of California, Berkeley under one or more contributor license
 * agreements. See the NOTICE file distributed with this work for additional information regarding
 * copyright ownership. The ASF licenses this file to You 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 com.onion.master;

import io.netty.bootstrap.Bootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import tachyon.Constants;
import tachyon.network.protocol.*;
import tachyon.network.protocol.databuffer.DataByteArrayChannel;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.util.concurrent.TimeUnit;

/**
 * Write data to a worker data server using Netty.
 */
public final class MasterBlockWriter {
    private static final Logger LOG = LoggerFactory.getLogger(Constants.LOGGER_TYPE);

    private final Bootstrap mClientBootstrap;
    private final ClientHandler mHandler;

    private boolean mOpen;
    private InetSocketAddress mAddress;
    private long mBlockId;
    private long mSessionId;

    // Total number of bytes written to the remote block.
    private long mWrittenBytes;

    /**
     * Creates a new {@link MasterBlockWriter}.
     */
    public MasterBlockWriter() {
        mHandler = new ClientHandler();
        mClientBootstrap = NettyClient.createClientBootstrap(mHandler);
        mOpen = false;
    }

    public void open(InetSocketAddress address, long blockId, long sessionId) throws IOException {
        if (mOpen) {
            throw new IOException();
            //  ExceptionMessage.WRITER_ALREADY_OPEN.getMessage(mAddress, mBlockId, mSessionId));
        }
        mAddress = address;
        mBlockId = blockId;
        mSessionId = sessionId;
        mWrittenBytes = 0;
        mOpen = true;
    }

    public void close() {
        if (mOpen) {
            mOpen = false;
        }
    }

    public void write(byte[] bytes, int offset, int length) throws IOException {
        SingleResponseListener listener = new SingleResponseListener();
        try {
            // TODO(hy): keep connection open across multiple write calls.
            ChannelFuture f = mClientBootstrap.connect(mAddress).sync();

            LOG.info("Connected to remote machine {}", mAddress);
            Channel channel = f.channel();
            mHandler.addListener(listener);
            channel.writeAndFlush(new RPCBlockWriteRequest(mSessionId, mBlockId, mWrittenBytes, length,
                    new DataByteArrayChannel(bytes, offset, length)));

            RPCResponse response = listener.get(NettyClient.TIMEOUT_MS, TimeUnit.MILLISECONDS);
            channel.close().sync();

            switch (response.getType()) {
            case RPC_BLOCK_WRITE_RESPONSE:
                RPCBlockWriteResponse resp = (RPCBlockWriteResponse) response;
                RPCResponse.Status status = resp.getStatus();
                LOG.info("status: {} from remote machine {} received", status, mAddress);

                if (status != RPCResponse.Status.SUCCESS) {
                    throw new IOException(status.getMessage());
                }
                mWrittenBytes += length;
                break;
            case RPC_ERROR_RESPONSE:
                RPCErrorResponse error = (RPCErrorResponse) response;
                throw new IOException(error.getStatus().getMessage());
            default:
                throw new IOException();
            }
        } catch (Exception e) {
            throw new IOException(e);
        } finally {
            mHandler.removeListener(listener);
        }
    }

}