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ByteBufChunkHandler.java
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ByteBufChunkHandler.java
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/*
* Copyright (c) 2002-2018 "Neo4j,"
* Neo4j Sweden AB [http://neo4j.com]
*
* This file is part of Neo4j Enterprise Edition. The included source
* code can be redistributed and/or modified under the terms of the
* GNU AFFERO GENERAL PUBLIC LICENSE Version 3
* (http://www.fsf.org/licensing/licenses/agpl-3.0.html) with the
* Commons Clause, as found in the associated LICENSE.txt file.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* Neo4j object code can be licensed independently from the source
* under separate terms from the AGPL. Inquiries can be directed to:
* licensing@neo4j.com
*
* More information is also available at:
* https://neo4j.com/licensing/
*/
package org.neo4j.causalclustering.messaging.marshalling;
import io.netty.buffer.ByteBuf;
import java.io.IOException;
import org.neo4j.causalclustering.core.replication.ReplicatedContent;
import org.neo4j.causalclustering.messaging.MessageTooBigException;
import org.neo4j.util.Preconditions;
import static java.lang.String.format;
import static org.neo4j.io.ByteUnit.gibiBytes;
/**
* Handles chunks for {@link ReplicatedContent} being serialized through {@link ChunkedReplicatedContent}.
*/
public interface ByteBufChunkHandler
{
static MaxTotalSize maxSizeHandler()
{
return new MaxTotalSize();
}
/**
* This method is called just before the chunk is sent to the netty pipeline.
*
* @param byteBuf chunk of the {@link ReplicatedContent}
* @throws IOException if the encoding should be interrupted. Use carefully and consider possible memory leak!
*/
void handle( ByteBuf byteBuf ) throws IOException;
class NoOp implements ByteBufChunkHandler
{
@Override
public void handle( ByteBuf byteBuf )
{
// do nothing
}
}
class MaxTotalSize implements ByteBufChunkHandler
{
private static final long DEFAULT_MAX_SERIALIZED_SIZE = gibiBytes( 1 );
private final long maxSize;
long totalSize;
MaxTotalSize( long maxSize )
{
Preconditions.requirePositive( maxSize );
this.maxSize = maxSize;
}
MaxTotalSize()
{
this.maxSize = DEFAULT_MAX_SERIALIZED_SIZE;
}
@Override
public void handle( ByteBuf byteBuf ) throws MessageTooBigException
{
if ( byteBuf == null )
{
return;
}
int additionalBytes = byteBuf.readableBytes();
this.totalSize += additionalBytes;
if ( this.totalSize > maxSize )
{
throw new MessageTooBigException( format( "Size limit exceeded. Limit is %d, wanted to write %d, written so far %d", maxSize, additionalBytes,
totalSize - additionalBytes ) );
}
}
}
}