io.vertx.mssqlclient.impl.codec.TdsMessageDecoder Maven / Gradle / Ivy
/*
* Copyright (c) 2011-2021 Contributors to the Eclipse Foundation
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
* which is available at https://www.apache.org/licenses/LICENSE-2.0.
*
* SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
*/
package io.vertx.mssqlclient.impl.codec;
import io.netty.buffer.ByteBufAllocator;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.vertx.sqlclient.impl.command.CommandBase;
import io.vertx.sqlclient.impl.command.CommandResponse;
public class TdsMessageDecoder extends ChannelInboundHandlerAdapter {
private final TdsMessageCodec tdsMessageCodec;
private ChannelHandlerContext chctx;
private ByteBufAllocator alloc;
private TdsMessage message;
public TdsMessageDecoder(TdsMessageCodec tdsMessageCodec) {
this.tdsMessageCodec = tdsMessageCodec;
}
@Override
public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
chctx = ctx;
alloc = ctx.alloc();
}
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
TdsPacket tdsPacket = (TdsPacket) msg;
if (message == null) {
message = TdsMessage.createForDecoding(alloc, tdsPacket);
} else {
message.aggregate(tdsPacket);
}
if (tdsPacket.status() == MessageStatus.END_OF_MESSAGE) {
decodeMessage();
}
}
@Override
public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
releaseMessage();
}
void fireCommandResponse(CommandResponse commandResponse) {
MSSQLCommandCodec c = tdsMessageCodec.poll();
commandResponse.cmd = (CommandBase) c.cmd;
chctx.fireChannelRead(commandResponse);
}
private void releaseMessage() {
if (message != null) {
message.release();
message = null;
}
}
private void decodeMessage() {
try {
MSSQLCommandCodec commandCodec = tdsMessageCodec.peek();
if (commandCodec == null) {
throw new IllegalStateException("No command codec for message of type [" + message.type() + "]");
}
commandCodec.decode(message.content());
} finally {
releaseMessage();
}
}
}