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MasterClient214.java
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MasterClient214.java
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/*
* Copyright (c) 2002-2018 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* 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.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.kernel.ha;
import org.jboss.netty.buffer.ChannelBuffer;
import java.io.IOException;
import org.neo4j.com.Client;
import org.neo4j.com.Deserializer;
import org.neo4j.com.ObjectSerializer;
import org.neo4j.com.Protocol;
import org.neo4j.com.Protocol214;
import org.neo4j.com.ProtocolVersion;
import org.neo4j.com.RequestContext;
import org.neo4j.com.RequestType;
import org.neo4j.com.Response;
import org.neo4j.com.Serializer;
import org.neo4j.com.monitor.RequestMonitor;
import org.neo4j.com.storecopy.ResponseUnpacker;
import org.neo4j.com.storecopy.StoreWriter;
import org.neo4j.helpers.Exceptions;
import org.neo4j.kernel.ha.com.master.HandshakeResult;
import org.neo4j.kernel.ha.com.master.Master;
import org.neo4j.kernel.ha.com.master.MasterServer;
import org.neo4j.kernel.ha.com.slave.MasterClient;
import org.neo4j.kernel.ha.id.IdAllocation;
import org.neo4j.kernel.ha.lock.LockResult;
import org.neo4j.kernel.ha.lock.LockStatus;
import org.neo4j.kernel.impl.store.StoreId;
import org.neo4j.kernel.impl.store.id.IdRange;
import org.neo4j.kernel.impl.store.id.IdType;
import org.neo4j.kernel.impl.transaction.TransactionRepresentation;
import org.neo4j.kernel.impl.transaction.log.ReadableClosablePositionAwareChannel;
import org.neo4j.kernel.impl.transaction.log.entry.LogEntryReader;
import org.neo4j.kernel.monitoring.ByteCounterMonitor;
import org.neo4j.logging.LogProvider;
import org.neo4j.storageengine.api.lock.ResourceType;
import static java.lang.String.format;
import static org.neo4j.com.Protocol.EMPTY_SERIALIZER;
import static org.neo4j.com.Protocol.VOID_DESERIALIZER;
import static org.neo4j.com.Protocol.readString;
import static org.neo4j.com.Protocol.writeString;
import static org.neo4j.com.ProtocolVersion.INTERNAL_PROTOCOL_VERSION;
/**
* The {@link org.neo4j.kernel.ha.com.master.Master} a slave should use to communicate with its master. It
* serializes requests and sends them to the master, more specifically
* {@link org.neo4j.kernel.ha.com.master.MasterServer} (which delegates to
* {@link org.neo4j.kernel.ha.com.master.MasterImpl}
* on the master side.
*/
public class MasterClient214 extends Client<Master> implements MasterClient
{
public static final ProtocolVersion PROTOCOL_VERSION = new ProtocolVersion( (byte) 8, INTERNAL_PROTOCOL_VERSION );
public static final ObjectSerializer<LockResult> LOCK_RESULT_OBJECT_SERIALIZER = ( responseObject, result ) ->
{
result.writeByte( responseObject.getStatus().ordinal() );
if ( responseObject.getStatus() == LockStatus.DEAD_LOCKED )
{
writeString( result, responseObject.getMessage() );
}
};
public static final Deserializer<LockResult> LOCK_RESULT_DESERIALIZER = ( buffer, temporaryBuffer ) ->
{
byte statusOrdinal = buffer.readByte();
LockStatus status;
try
{
status = LockStatus.values()[statusOrdinal];
}
catch ( ArrayIndexOutOfBoundsException e )
{
throw withInvalidOrdinalMessage( buffer, statusOrdinal, e );
}
return status == LockStatus.DEAD_LOCKED ? new LockResult( LockStatus.DEAD_LOCKED, readString( buffer ) )
: new LockResult( status );
};
protected static ArrayIndexOutOfBoundsException withInvalidOrdinalMessage(
ChannelBuffer buffer, byte statusOrdinal, ArrayIndexOutOfBoundsException e )
{
int maxBytesToPrint = 1024 * 40;
return Exceptions.withMessage( e,
format( "%s | read invalid ordinal %d. First %db of this channel buffer is:%n%s",
e.getMessage(), statusOrdinal, maxBytesToPrint,
beginningOfBufferAsHexString( buffer, maxBytesToPrint ) ) );
}
private final long lockReadTimeoutMillis;
private final HaRequestTypes requestTypes;
private final Deserializer<LockResult> lockResultDeserializer;
public MasterClient214( String destinationHostNameOrIp, int destinationPort, String originHostNameOrIp,
LogProvider logProvider, StoreId storeId, long readTimeoutMillis,
long lockReadTimeoutMillis, int maxConcurrentChannels, int chunkSize,
ResponseUnpacker responseUnpacker,
ByteCounterMonitor byteCounterMonitor, RequestMonitor requestMonitor,
LogEntryReader<ReadableClosablePositionAwareChannel> entryReader )
{
super( destinationHostNameOrIp, destinationPort, originHostNameOrIp, logProvider, storeId,
MasterServer.FRAME_LENGTH, readTimeoutMillis, maxConcurrentChannels, chunkSize,
responseUnpacker, byteCounterMonitor, requestMonitor, entryReader );
this.lockReadTimeoutMillis = lockReadTimeoutMillis;
this.requestTypes = new HaRequestType210( entryReader, createLockResultSerializer() );
this.lockResultDeserializer = createLockResultDeserializer();
}
@Override
protected Protocol createProtocol( int chunkSize, byte applicationProtocolVersion )
{
return new Protocol214( chunkSize, applicationProtocolVersion, getInternalProtocolVersion() );
}
@Override
public ProtocolVersion getProtocolVersion()
{
return PROTOCOL_VERSION;
}
@Override
public ObjectSerializer<LockResult> createLockResultSerializer()
{
return LOCK_RESULT_OBJECT_SERIALIZER;
}
@Override
public Deserializer<LockResult> createLockResultDeserializer()
{
return LOCK_RESULT_DESERIALIZER;
}
@Override
protected long getReadTimeout( RequestType type, long readTimeout )
{
if ( HaRequestTypes.Type.ACQUIRE_EXCLUSIVE_LOCK.is( type ) ||
HaRequestTypes.Type.ACQUIRE_SHARED_LOCK.is( type ) )
{
return lockReadTimeoutMillis;
}
if ( HaRequestTypes.Type.COPY_STORE.is( type ) )
{
return readTimeout * 2;
}
return readTimeout;
}
@Override
protected boolean shouldCheckStoreId( RequestType type )
{
return !HaRequestTypes.Type.COPY_STORE.is( type );
}
@Override
public Response<IdAllocation> allocateIds( RequestContext context, final IdType idType )
{
Serializer serializer = buffer -> buffer.writeByte( idType.ordinal() );
Deserializer<IdAllocation> deserializer = ( buffer, temporaryBuffer ) -> readIdAllocation( buffer );
return sendRequest( requestTypes.type( HaRequestTypes.Type.ALLOCATE_IDS ), context, serializer, deserializer );
}
@Override
public Response<Integer> createRelationshipType( RequestContext context, final String name )
{
Serializer serializer = buffer -> writeString( buffer, name );
Deserializer<Integer> deserializer = ( buffer, temporaryBuffer ) -> buffer.readInt();
return sendRequest( requestTypes.type( HaRequestTypes.Type.CREATE_RELATIONSHIP_TYPE ), context, serializer,
deserializer );
}
@Override
public Response<Integer> createPropertyKey( RequestContext context, final String name )
{
Serializer serializer = buffer -> writeString( buffer, name );
Deserializer<Integer> deserializer = ( buffer, temporaryBuffer ) -> buffer.readInt();
return sendRequest( requestTypes.type( HaRequestTypes.Type.CREATE_PROPERTY_KEY ), context, serializer,
deserializer );
}
@Override
public Response<Integer> createLabel( RequestContext context, final String name )
{
Serializer serializer = buffer -> writeString( buffer, name );
Deserializer<Integer> deserializer = ( buffer, temporaryBuffer ) -> buffer.readInt();
return sendRequest( requestTypes.type( HaRequestTypes.Type.CREATE_LABEL ), context, serializer, deserializer );
}
@Override
public Response<Void> newLockSession( RequestContext context )
{
return sendRequest( requestTypes.type( HaRequestTypes.Type.NEW_LOCK_SESSION ), context, EMPTY_SERIALIZER,
VOID_DESERIALIZER );
}
@Override
public Response<LockResult> acquireSharedLock(
RequestContext context, ResourceType type, long... resourceIds )
{
return sendRequest( requestTypes.type( HaRequestTypes.Type.ACQUIRE_SHARED_LOCK ), context,
new AcquireLockSerializer( type, resourceIds ), lockResultDeserializer );
}
@Override
public Response<LockResult> acquireExclusiveLock(
RequestContext context, ResourceType type, long... resourceIds )
{
return sendRequest( requestTypes.type( HaRequestTypes.Type.ACQUIRE_EXCLUSIVE_LOCK ), context,
new AcquireLockSerializer( type, resourceIds ), lockResultDeserializer );
}
@Override
public Response<Long> commit( RequestContext context, TransactionRepresentation tx )
{
Serializer serializer = new Protocol.TransactionSerializer( tx );
Deserializer<Long> deserializer = ( buffer, temporaryBuffer ) -> buffer.readLong();
return sendRequest( requestTypes.type( HaRequestTypes.Type.COMMIT ), context, serializer, deserializer );
}
@Override
public Response<Void> endLockSession( RequestContext context, final boolean success )
{
Serializer serializer = buffer -> buffer.writeByte( success ? 1 : 0 );
return sendRequest( requestTypes.type( HaRequestTypes.Type.END_LOCK_SESSION ), context, serializer,
VOID_DESERIALIZER );
}
@Override
public Response<Void> pullUpdates( RequestContext context )
{
return pullUpdates( context, ResponseUnpacker.TxHandler.NO_OP_TX_HANDLER );
}
@Override
public Response<Void> pullUpdates( RequestContext context, ResponseUnpacker.TxHandler txHandler )
{
return sendRequest( requestTypes.type( HaRequestTypes.Type.PULL_UPDATES ), context,
EMPTY_SERIALIZER, VOID_DESERIALIZER, null, txHandler );
}
@Override
public Response<HandshakeResult> handshake( final long txId, StoreId storeId )
{
Serializer serializer = buffer -> buffer.writeLong( txId );
Deserializer<HandshakeResult> deserializer =
( buffer, temporaryBuffer ) -> new HandshakeResult( buffer.readLong(), buffer.readLong() );
return sendRequest( requestTypes.type( HaRequestTypes.Type.HANDSHAKE ), RequestContext.EMPTY,
serializer, deserializer, storeId, ResponseUnpacker.TxHandler.NO_OP_TX_HANDLER );
}
@Override
public Response<Void> copyStore( RequestContext context, final StoreWriter writer )
{
context = stripFromTransactions( context );
return sendRequest( requestTypes.type( HaRequestTypes.Type.COPY_STORE ), context, EMPTY_SERIALIZER,
createFileStreamDeserializer( writer ) );
}
protected Deserializer<Void> createFileStreamDeserializer( StoreWriter writer )
{
return new Protocol.FileStreamsDeserializer210( writer );
}
private RequestContext stripFromTransactions( RequestContext context )
{
return new RequestContext( context.getEpoch(), context.machineId(), context.getEventIdentifier(),
0, context.getChecksum() );
}
private static IdAllocation readIdAllocation( ChannelBuffer buffer )
{
int numberOfDefragIds = buffer.readInt();
long[] defragIds = new long[numberOfDefragIds];
for ( int i = 0; i < numberOfDefragIds; i++ )
{
defragIds[i] = buffer.readLong();
}
long rangeStart = buffer.readLong();
int rangeLength = buffer.readInt();
long highId = buffer.readLong();
long defragCount = buffer.readLong();
return new IdAllocation( new IdRange( defragIds, rangeStart, rangeLength ),
highId, defragCount );
}
private static class AcquireLockSerializer implements Serializer
{
private final ResourceType type;
private final long[] resourceIds;
AcquireLockSerializer( ResourceType type, long... resourceIds )
{
this.type = type;
this.resourceIds = resourceIds;
}
@Override
public void write( ChannelBuffer buffer ) throws IOException
{
buffer.writeInt( type.typeId() );
buffer.writeInt( resourceIds.length );
for ( long entity : resourceIds )
{
buffer.writeLong( entity );
}
}
}
}