spark StreamResponse 源码
spark StreamResponse 代码
文件路径：/common/network-common/src/main/java/org/apache/spark/network/protocol/StreamResponse.java
/*
* 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.protocol;
import java.util.Objects;
import io.netty.buffer.ByteBuf;
import org.apache.commons.lang3.builder.ToStringBuilder;
import org.apache.commons.lang3.builder.ToStringStyle;
import org.apache.spark.network.buffer.ManagedBuffer;
/**
* Response to {@link StreamRequest} when the stream has been successfully opened.
* <p>
* Note the message itself does not contain the stream data. That is written separately by the
* sender. The receiver is expected to set a temporary channel handler that will consume the
* number of bytes this message says the stream has.
*/
public final class StreamResponse extends AbstractResponseMessage {
public final String streamId;
public final long byteCount;
public StreamResponse(String streamId, long byteCount, ManagedBuffer buffer) {
super(buffer, false);
this.streamId = streamId;
this.byteCount = byteCount;
}
@Override
public Message.Type type() { return Type.StreamResponse; }
@Override
public int encodedLength() {
return 8 + Encoders.Strings.encodedLength(streamId);
}
/** Encoding does NOT include 'buffer' itself. See {@link MessageEncoder}. */
@Override
public void encode(ByteBuf buf) {
Encoders.Strings.encode(buf, streamId);
buf.writeLong(byteCount);
}
@Override
public ResponseMessage createFailureResponse(String error) {
return new StreamFailure(streamId, error);
}
public static StreamResponse decode(ByteBuf buf) {
String streamId = Encoders.Strings.decode(buf);
long byteCount = buf.readLong();
return new StreamResponse(streamId, byteCount, null);
}
@Override
public int hashCode() {
return Objects.hash(byteCount, streamId);
}
@Override
public boolean equals(Object other) {
if (other instanceof StreamResponse) {
StreamResponse o = (StreamResponse) other;
return byteCount == o.byteCount && streamId.equals(o.streamId);
}
return false;
}
@Override
public String toString() {
return new ToStringBuilder(this, ToStringStyle.SHORT_PREFIX_STYLE)
.append("streamId", streamId)
.append("byteCount", byteCount)
.append("body", body())
.toString();
}
}
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