org.apache.spark.network.shuffle.protocol.StreamHandle.java Source code

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Here is the source code for org.apache.spark.network.shuffle.protocol.StreamHandle.java

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/*
 * Licensed to the Apache Software Foundation (ASF) 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 org.apache.spark.network.shuffle.protocol;

import com.google.common.base.Objects;
import io.netty.buffer.ByteBuf;

// Needed by ScalaDoc. See SPARK-7726
import static org.apache.spark.network.shuffle.protocol.BlockTransferMessage.Type;

/**
 * Identifier for a fixed number of chunks to read from a stream created by an "open blocks"
 * message. This is used by {@link org.apache.spark.network.shuffle.OneForOneBlockFetcher}.
 */
public class StreamHandle extends BlockTransferMessage {
    public final long streamId;
    public final int numChunks;

    public StreamHandle(long streamId, int numChunks) {
        this.streamId = streamId;
        this.numChunks = numChunks;
    }

    @Override
    protected Type type() {
        return Type.STREAM_HANDLE;
    }

    @Override
    public int hashCode() {
        return Objects.hashCode(streamId, numChunks);
    }

    @Override
    public String toString() {
        return Objects.toStringHelper(this).add("streamId", streamId).add("numChunks", numChunks).toString();
    }

    @Override
    public boolean equals(Object other) {
        if (other != null && other instanceof StreamHandle) {
            StreamHandle o = (StreamHandle) other;
            return Objects.equal(streamId, o.streamId) && Objects.equal(numChunks, o.numChunks);
        }
        return false;
    }

    @Override
    public int encodedLength() {
        return 8 + 4;
    }

    @Override
    public void encode(ByteBuf buf) {
        buf.writeLong(streamId);
        buf.writeInt(numChunks);
    }

    public static StreamHandle decode(ByteBuf buf) {
        long streamId = buf.readLong();
        int numChunks = buf.readInt();
        return new StreamHandle(streamId, numChunks);
    }
}