/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.netty4;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.ByteToMessageDecoder;
import io.netty.handler.codec.TooLongFrameException;
import org.elasticsearch.transport.TcpHeader;
import org.elasticsearch.transport.TcpTransport;
import java.util.List;
final class Netty4SizeHeaderFrameDecoder extends ByteToMessageDecoder {
@Override
protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
try {
boolean continueProcessing = TcpTransport.validateMessageHeader(Netty4Utils.toBytesReference(in));
final ByteBuf message = in.skipBytes(TcpHeader.MARKER_BYTES_SIZE + TcpHeader.MESSAGE_LENGTH_SIZE);
if (!continueProcessing) return;
out.add(message);
} catch (IllegalArgumentException ex) {
throw new TooLongFrameException(ex);
} catch (IllegalStateException ex) {
/* decode will be called until the ByteBuf is fully consumed; when it is fully
* consumed, transport#validateMessageHeader will throw an IllegalStateException which
* is okay, it means we have finished consuming the ByteBuf and we can get out
*/
}
}
}