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/*
* 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 com.datastax.oss.driver.internal.core.protocol;
import com.datastax.oss.protocol.internal.Frame;
import com.datastax.oss.protocol.internal.FrameCodec;
import com.datastax.oss.protocol.internal.Segment;
import edu.umd.cs.findbugs.annotations.NonNull;
import com.datastax.oss.driver.shaded.netty.buffer.ByteBuf;
import com.datastax.oss.driver.shaded.netty.buffer.ByteBufAllocator;
import com.datastax.oss.driver.shaded.netty.buffer.CompositeByteBuf;
import com.datastax.oss.driver.shaded.netty.channel.ChannelHandlerContext;
import com.datastax.oss.driver.shaded.netty.handler.codec.MessageToMessageDecoder;
import java.util.ArrayList;
import java.util.List;
import net.jcip.annotations.NotThreadSafe;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Converts the segments decoded by {@link BytesToSegmentDecoder} into legacy frames understood by
* the rest of the driver.
*/
@NotThreadSafe
public class SegmentToFrameDecoder extends MessageToMessageDecoder> {
private static final Logger LOG = LoggerFactory.getLogger(SegmentToFrameDecoder.class);
private static final int UNKNOWN_LENGTH = Integer.MIN_VALUE;
private final FrameCodec frameCodec;
private final String logPrefix;
// Accumulated state when we are reading a sequence of slices
private int targetLength = UNKNOWN_LENGTH;
private final List accumulatedSlices = new ArrayList<>();
private int accumulatedLength;
public SegmentToFrameDecoder(@NonNull FrameCodec frameCodec, @NonNull String logPrefix) {
this.logPrefix = logPrefix;
this.frameCodec = frameCodec;
}
@Override
protected void decode(
@NonNull ChannelHandlerContext ctx,
@NonNull Segment segment,
@NonNull List