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PrepareStoreCopyResponse.java
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PrepareStoreCopyResponse.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.catchup.storecopy;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.ByteToMessageDecoder;
import io.netty.handler.codec.MessageToByteEncoder;
import org.eclipse.collections.api.iterator.LongIterator;
import org.eclipse.collections.api.set.primitive.LongSet;
import org.eclipse.collections.api.set.primitive.MutableLongSet;
import org.eclipse.collections.impl.factory.primitive.LongSets;
import org.eclipse.collections.impl.set.mutable.primitive.LongHashSet;
import java.io.File;
import java.io.IOException;
import java.util.Arrays;
import java.util.List;
import java.util.Objects;
import org.neo4j.causalclustering.core.state.storage.SafeChannelMarshal;
import org.neo4j.causalclustering.messaging.BoundedNetworkWritableChannel;
import org.neo4j.causalclustering.messaging.NetworkReadableClosableChannelNetty4;
import org.neo4j.storageengine.api.ReadableChannel;
import org.neo4j.storageengine.api.WritableChannel;
import org.neo4j.string.UTF8;
public class PrepareStoreCopyResponse
{
private final File[] files;
private final LongSet indexIds;
private final Long transactionId;
private final Status status;
public static PrepareStoreCopyResponse error( Status errorStatus )
{
if ( errorStatus == Status.SUCCESS )
{
throw new IllegalStateException( "Cannot create error result from state: " + errorStatus );
}
return new PrepareStoreCopyResponse( new File[0], LongSets.immutable.empty(), 0L, errorStatus );
}
public static PrepareStoreCopyResponse success( File[] storeFiles, LongSet indexIds, long lastTransactionId )
{
return new PrepareStoreCopyResponse( storeFiles, indexIds, lastTransactionId, Status.SUCCESS );
}
LongSet getIndexIds()
{
return indexIds;
}
enum Status
{
SUCCESS,
E_STORE_ID_MISMATCH,
E_LISTING_STORE
}
private PrepareStoreCopyResponse( File[] files, LongSet indexIds, Long transactionId, Status status )
{
this.files = files;
this.indexIds = indexIds;
this.transactionId = transactionId;
this.status = status;
}
public File[] getFiles()
{
return files;
}
long lastTransactionId()
{
return transactionId;
}
public Status status()
{
return status;
}
@Override
public boolean equals( Object o )
{
if ( this == o )
{
return true;
}
if ( o == null || getClass() != o.getClass() )
{
return false;
}
PrepareStoreCopyResponse that = (PrepareStoreCopyResponse) o;
return Arrays.equals( files, that.files ) && indexIds.equals( that.indexIds ) &&
Objects.equals( transactionId, that.transactionId ) && status == that.status;
}
@Override
public int hashCode()
{
return Objects.hash( Arrays.hashCode( files ), indexIds, transactionId, status );
}
public static class StoreListingMarshal extends SafeChannelMarshal<PrepareStoreCopyResponse>
{
@Override
public void marshal( PrepareStoreCopyResponse prepareStoreCopyResponse, WritableChannel buffer ) throws IOException
{
buffer.putInt( prepareStoreCopyResponse.status.ordinal() );
buffer.putLong( prepareStoreCopyResponse.transactionId );
marshalFiles( buffer, prepareStoreCopyResponse.files );
marshalIndexIds( buffer, prepareStoreCopyResponse.indexIds );
}
@Override
protected PrepareStoreCopyResponse unmarshal0( ReadableChannel channel ) throws IOException
{
int ordinal = channel.getInt();
Status status = Status.values()[ordinal];
Long transactionId = channel.getLong();
File[] files = unmarshalFiles( channel );
LongSet indexIds = unmarshalIndexIds( channel );
return new PrepareStoreCopyResponse( files, indexIds, transactionId, status );
}
private static void marshalFiles( WritableChannel buffer, File[] files ) throws IOException
{
buffer.putInt( files.length );
for ( File file : files )
{
putBytes( buffer, file.getName() );
}
}
private void marshalIndexIds( WritableChannel buffer, LongSet indexIds ) throws IOException
{
buffer.putInt( indexIds.size() );
LongIterator itr = indexIds.longIterator();
while ( itr.hasNext() )
{
long indexId = itr.next();
buffer.putLong( indexId );
}
}
private static File[] unmarshalFiles( ReadableChannel channel ) throws IOException
{
int numberOfFiles = channel.getInt();
File[] files = new File[numberOfFiles];
for ( int i = 0; i < numberOfFiles; i++ )
{
files[i] = unmarshalFile( channel );
}
return files;
}
private static File unmarshalFile( ReadableChannel channel ) throws IOException
{
byte[] name = readBytes( channel );
return new File( UTF8.decode( name ) );
}
private LongSet unmarshalIndexIds( ReadableChannel channel ) throws IOException
{
int numberOfIndexIds = channel.getInt();
MutableLongSet indexIds = new LongHashSet( numberOfIndexIds );
for ( int i = 0; i < numberOfIndexIds; i++ )
{
indexIds.add( channel.getLong() );
}
return indexIds;
}
private static void putBytes( WritableChannel buffer, String value ) throws IOException
{
byte[] bytes = UTF8.encode( value );
buffer.putInt( bytes.length );
buffer.put( bytes, bytes.length );
}
private static byte[] readBytes( ReadableChannel channel ) throws IOException
{
int bytesLength = channel.getInt();
byte[] bytes = new byte[bytesLength];
channel.get( bytes, bytesLength );
return bytes;
}
}
public static class Encoder extends MessageToByteEncoder<PrepareStoreCopyResponse>
{
@Override
protected void encode( ChannelHandlerContext channelHandlerContext, PrepareStoreCopyResponse prepareStoreCopyResponse, ByteBuf byteBuf )
throws Exception
{
new PrepareStoreCopyResponse.StoreListingMarshal().marshal( prepareStoreCopyResponse, new BoundedNetworkWritableChannel( byteBuf ) );
}
}
public static class Decoder extends ByteToMessageDecoder
{
@Override
protected void decode( ChannelHandlerContext channelHandlerContext, ByteBuf byteBuf, List<Object> list ) throws Exception
{
list.add( new PrepareStoreCopyResponse.StoreListingMarshal().unmarshal( new NetworkReadableClosableChannelNetty4( byteBuf ) ) );
}
}
}