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Elasticsearch subproject :server
/*
* Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
* or more contributor license agreements. Licensed under the Elastic License
* 2.0 and the Server Side Public License, v 1; you may not use this file except
* in compliance with, at your election, the Elastic License 2.0 or the Server
* Side Public License, v 1.
*/
package org.elasticsearch.transport;
import org.elasticsearch.Version;
import org.elasticsearch.common.io.stream.StreamOutput;
import java.io.IOException;
public class TcpHeader {
public static final Version VERSION_WITH_HEADER_SIZE = Version.V_7_6_0;
public static final int MARKER_BYTES_SIZE = 2;
public static final int MESSAGE_LENGTH_SIZE = 4;
public static final int REQUEST_ID_SIZE = 8;
public static final int STATUS_SIZE = 1;
public static final int VERSION_ID_SIZE = 4;
public static final int VARIABLE_HEADER_SIZE = 4;
public static final int BYTES_REQUIRED_FOR_MESSAGE_SIZE = MARKER_BYTES_SIZE + MESSAGE_LENGTH_SIZE;
public static final int VERSION_POSITION = MARKER_BYTES_SIZE + MESSAGE_LENGTH_SIZE + REQUEST_ID_SIZE + STATUS_SIZE;
public static final int VARIABLE_HEADER_SIZE_POSITION = VERSION_POSITION + VERSION_ID_SIZE;
private static final int PRE_76_HEADER_SIZE = VERSION_POSITION + VERSION_ID_SIZE;
public static final int BYTES_REQUIRED_FOR_VERSION = PRE_76_HEADER_SIZE;
private static final int HEADER_SIZE = PRE_76_HEADER_SIZE + VARIABLE_HEADER_SIZE;
public static int headerSize(Version version) {
if (version.onOrAfter(VERSION_WITH_HEADER_SIZE)) {
return HEADER_SIZE;
} else {
return PRE_76_HEADER_SIZE;
}
}
private static final byte[] PREFIX = { (byte) 'E', (byte) 'S' };
public static void writeHeader(
StreamOutput output,
long requestId,
byte status,
Version version,
int contentSize,
int variableHeaderSize
) throws IOException {
output.writeBytes(PREFIX);
// write the size, the size indicates the remaining message size, not including the size int
if (version.onOrAfter(VERSION_WITH_HEADER_SIZE)) {
output.writeInt(contentSize + REQUEST_ID_SIZE + STATUS_SIZE + VERSION_ID_SIZE + VARIABLE_HEADER_SIZE);
} else {
output.writeInt(contentSize + REQUEST_ID_SIZE + STATUS_SIZE + VERSION_ID_SIZE);
}
output.writeLong(requestId);
output.writeByte(status);
output.writeInt(version.id);
if (version.onOrAfter(VERSION_WITH_HEADER_SIZE)) {
assert variableHeaderSize != -1 : "Variable header size not set";
output.writeInt(variableHeaderSize);
}
}
}