/*
* 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.jackrabbit.oak.plugins.segment.standby.codec;
import java.io.IOException;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.LengthFieldBasedFrameDecoder;
import io.netty.util.CharsetUtil;
import org.apache.jackrabbit.oak.plugins.segment.RecordId;
import org.apache.jackrabbit.oak.plugins.segment.SegmentStore;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class RecordIdDecoder extends LengthFieldBasedFrameDecoder {
private static final Logger log = LoggerFactory
.getLogger(RecordIdDecoder.class);
private final SegmentStore store;
public RecordIdDecoder(SegmentStore store) {
super(64, 0, 4, 0, 4);
this.store = store;
}
@Override
protected Object decode(ChannelHandlerContext ctx, ByteBuf in)
throws Exception {
ByteBuf frame = (ByteBuf) super.decode(ctx, in);
if (frame == null) {
throw new IOException("Received unexpected empty frame. Maybe you have enabled secure transmission on only one endpoint of the connection.");
}
byte type = frame.readByte();
frame.discardReadBytes();
String id = frame.toString(CharsetUtil.UTF_8);
try {
log.debug("received type {} with id {}", type, id);
return RecordId.fromString(store.getTracker(), id);
} catch (IllegalArgumentException e) {
log.error(e.getMessage(), e);
}
return null;
}
@Override
protected ByteBuf extractFrame(ChannelHandlerContext ctx, ByteBuf buffer,
int index, int length) {
return buffer.slice(index, length);
}
}