alluxio.client.netty.NettyRemoteBlockWriter.java Source code

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Here is the source code for alluxio.client.netty.NettyRemoteBlockWriter.java

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/*
 * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
 * (the "License"). You may not use this work except in compliance with the License, which is
 * available at www.apache.org/licenses/LICENSE-2.0
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied, as more fully set forth in the License.
 *
 * See the NOTICE file distributed with this work for information regarding copyright ownership.
 */

package alluxio.client.netty;

import alluxio.Constants;
import alluxio.client.RemoteBlockWriter;
import alluxio.exception.ExceptionMessage;
import alluxio.network.protocol.RPCBlockWriteRequest;
import alluxio.network.protocol.RPCBlockWriteResponse;
import alluxio.network.protocol.RPCErrorResponse;
import alluxio.network.protocol.RPCMessage;
import alluxio.network.protocol.RPCResponse;
import alluxio.network.protocol.databuffer.DataByteArrayChannel;

import io.netty.bootstrap.Bootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

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

import javax.annotation.concurrent.NotThreadSafe;

/**
 * Write data to a remote data server using Netty.
 */
@NotThreadSafe
public final class NettyRemoteBlockWriter implements RemoteBlockWriter {
    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 NettyRemoteBlockWriter}.
     */
    public NettyRemoteBlockWriter() {
        mHandler = new ClientHandler();
        mClientBootstrap = NettyClient.createClientBootstrap(mHandler);
        mOpen = false;
    }

    @Override
    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;
    }

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

    @Override
    public void write(byte[] bytes, int offset, int length) throws IOException {
        SingleResponseListener listener = null;
        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();
            listener = new SingleResponseListener();
            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(ExceptionMessage.BLOCK_WRITE_ERROR.getMessage(mBlockId, mSessionId,
                            mAddress, status.getMessage()));
                }
                mWrittenBytes += length;
                break;
            case RPC_ERROR_RESPONSE:
                RPCErrorResponse error = (RPCErrorResponse) response;
                throw new IOException(error.getStatus().getMessage());
            default:
                throw new IOException(ExceptionMessage.UNEXPECTED_RPC_RESPONSE.getMessage(response.getType(),
                        RPCMessage.Type.RPC_BLOCK_WRITE_RESPONSE));
            }
        } catch (Exception e) {
            throw new IOException(e);
        } finally {
            if (listener != null) {
                mHandler.removeListener(listener);
            }
        }
    }
}