/*
* Licensed to Elastic Search and Shay Banon under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Elastic Search 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.elasticsearch.transport.support;
import org.elasticsearch.common.io.stream.CachedStreamOutput;
import org.elasticsearch.common.io.stream.HandlesStreamOutput;
import org.elasticsearch.common.io.stream.Streamable;
import org.elasticsearch.transport.TransportRequestOptions;
import org.elasticsearch.transport.TransportResponseOptions;
import java.io.IOException;
/**
* @author kimchy (shay.banon)
*/
public class TransportStreams {
public static final int HEADER_SIZE = 4 + 8 + 1;
public static final byte[] HEADER_PLACEHOLDER = new byte[HEADER_SIZE];
public static void writeHeader(byte[] data, int dataLength, long requestId, byte status) {
writeInt(data, 0, dataLength - 4); // no need for the header, already there
writeLong(data, 4, requestId);
data[12] = status;
}
// same as writeLong in StreamOutput
private static void writeLong(byte[] buffer, int offset, long value) {
buffer[offset++] = ((byte) (value >> 56));
buffer[offset++] = ((byte) (value >> 48));
buffer[offset++] = ((byte) (value >> 40));
buffer[offset++] = ((byte) (value >> 32));
buffer[offset++] = ((byte) (value >> 24));
buffer[offset++] = ((byte) (value >> 16));
buffer[offset++] = ((byte) (value >> 8));
buffer[offset] = ((byte) (value));
}
// same as writeInt in StreamOutput
private static void writeInt(byte[] buffer, int offset, int value) {
buffer[offset++] = ((byte) (value >> 24));
buffer[offset++] = ((byte) (value >> 16));
buffer[offset++] = ((byte) (value >> 8));
buffer[offset] = ((byte) (value));
}
private static final byte STATUS_REQRES = 1 << 0;
private static final byte STATUS_ERROR = 1 << 1;
private static final byte STATUS_COMPRESS = 1 << 2;
public static boolean statusIsRequest(byte value) {
return (value & STATUS_REQRES) == 0;
}
public static byte statusSetRequest(byte value) {
value &= ~STATUS_REQRES;
return value;
}
public static byte statusSetResponse(byte value) {
value |= STATUS_REQRES;
return value;
}
public static boolean statusIsError(byte value) {
return (value & STATUS_ERROR) != 0;
}
public static byte statusSetError(byte value) {
value |= STATUS_ERROR;
return value;
}
public static boolean statusIsCompress(byte value) {
return (value & STATUS_COMPRESS) != 0;
}
public static byte statusSetCompress(byte value) {
value |= STATUS_COMPRESS;
return value;
}
public static void buildRequest(CachedStreamOutput.Entry cachedEntry, final long requestId, final String action, final Streamable message, TransportRequestOptions options) throws IOException {
byte status = 0;
status = TransportStreams.statusSetRequest(status);
if (options.compress()) {
status = TransportStreams.statusSetCompress(status);
HandlesStreamOutput stream = cachedEntry.cachedHandlesLzfBytes();
cachedEntry.bytes().write(HEADER_PLACEHOLDER);
stream.writeUTF(action);
message.writeTo(stream);
stream.flush();
} else {
HandlesStreamOutput stream = cachedEntry.cachedHandlesBytes();
cachedEntry.bytes().write(HEADER_PLACEHOLDER);
stream.writeUTF(action);
message.writeTo(stream);
stream.flush();
}
TransportStreams.writeHeader(cachedEntry.bytes().unsafeByteArray(), cachedEntry.bytes().size(), requestId, status);
}
public static void buildResponse(CachedStreamOutput.Entry cachedEntry, final long requestId, Streamable message, TransportResponseOptions options) throws IOException {
byte status = 0;
status = TransportStreams.statusSetResponse(status);
if (options.compress()) {
status = TransportStreams.statusSetCompress(status);
HandlesStreamOutput stream = cachedEntry.cachedHandlesLzfBytes();
cachedEntry.bytes().write(HEADER_PLACEHOLDER);
message.writeTo(stream);
stream.flush();
} else {
HandlesStreamOutput stream = cachedEntry.cachedHandlesBytes();
cachedEntry.bytes().write(HEADER_PLACEHOLDER);
message.writeTo(stream);
stream.flush();
}
TransportStreams.writeHeader(cachedEntry.bytes().unsafeByteArray(), cachedEntry.bytes().size(), requestId, status);
}
}