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IndexProxyCreator.java
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IndexProxyCreator.java
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/*
* Copyright (c) 2002-2018 "Neo4j,"
* Neo4j Sweden AB [http://neo4j.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 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.kernel.impl.api.index;
import java.io.IOException;
import org.neo4j.internal.kernel.api.TokenNameLookup;
import org.neo4j.kernel.api.index.IndexAccessor;
import org.neo4j.kernel.api.index.IndexPopulator;
import org.neo4j.kernel.api.index.IndexProvider;
import org.neo4j.kernel.api.schema.index.CapableIndexDescriptor;
import org.neo4j.kernel.api.schema.index.StoreIndexDescriptor;
import org.neo4j.kernel.impl.api.index.sampling.IndexSamplingConfig;
import org.neo4j.logging.LogProvider;
import static java.lang.String.format;
/**
* Helper class of {@link IndexingService}. Used mainly as factory of index proxies.
*/
class IndexProxyCreator
{
private final IndexSamplingConfig samplingConfig;
private final IndexStoreView storeView;
private final IndexProviderMap providerMap;
private final TokenNameLookup tokenNameLookup;
private final LogProvider logProvider;
IndexProxyCreator( IndexSamplingConfig samplingConfig,
IndexStoreView storeView,
IndexProviderMap providerMap,
TokenNameLookup tokenNameLookup,
LogProvider logProvider )
{
this.samplingConfig = samplingConfig;
this.storeView = storeView;
this.providerMap = providerMap;
this.tokenNameLookup = tokenNameLookup;
this.logProvider = logProvider;
}
IndexProxy createPopulatingIndexProxy( final StoreIndexDescriptor descriptor, final boolean flipToTentative, final IndexingService.Monitor monitor,
final IndexPopulationJob populationJob )
{
final FlippableIndexProxy flipper = new FlippableIndexProxy();
final String indexUserDescription = indexUserDescription( descriptor );
IndexPopulator populator = populatorFromProvider( descriptor, samplingConfig );
CapableIndexDescriptor capableIndexDescriptor = descriptor.withCapabilities( providerMap );
FailedIndexProxyFactory failureDelegateFactory = new FailedPopulatingIndexProxyFactory( capableIndexDescriptor,
populator,
indexUserDescription,
new IndexCountsRemover( storeView, descriptor.getId() ),
logProvider );
MultipleIndexPopulator.IndexPopulation indexPopulation = populationJob
.addPopulator( populator, capableIndexDescriptor, indexUserDescription, flipper, failureDelegateFactory );
PopulatingIndexProxy populatingIndex = new PopulatingIndexProxy( capableIndexDescriptor, populationJob, indexPopulation );
flipper.flipTo( populatingIndex );
// Prepare for flipping to online mode
flipper.setFlipTarget( () ->
{
monitor.populationCompleteOn( descriptor );
OnlineIndexProxy onlineProxy = new OnlineIndexProxy( capableIndexDescriptor, onlineAccessorFromProvider( descriptor, samplingConfig ),
storeView,
true );
if ( flipToTentative )
{
return new TentativeConstraintIndexProxy( flipper, onlineProxy );
}
return onlineProxy;
} );
return new ContractCheckingIndexProxy( flipper, false );
}
IndexProxy createRecoveringIndexProxy( StoreIndexDescriptor descriptor )
{
CapableIndexDescriptor capableIndexDescriptor = descriptor.withCapabilities( providerMap );
IndexProxy proxy = new RecoveringIndexProxy( capableIndexDescriptor );
return new ContractCheckingIndexProxy( proxy, true );
}
IndexProxy createOnlineIndexProxy( StoreIndexDescriptor descriptor )
{
try
{
IndexAccessor onlineAccessor = onlineAccessorFromProvider( descriptor, samplingConfig );
CapableIndexDescriptor capableIndexDescriptor = descriptor.withCapabilities( providerMap );
IndexProxy proxy;
proxy = new OnlineIndexProxy( capableIndexDescriptor, onlineAccessor, storeView, false );
proxy = new ContractCheckingIndexProxy( proxy, true );
return proxy;
}
catch ( IOException e )
{
logProvider.getLog( getClass() ).error( "Failed to open index: " + descriptor.getId() +
" (" + descriptor.userDescription( tokenNameLookup ) +
"), requesting re-population.", e );
return createRecoveringIndexProxy( descriptor );
}
}
IndexProxy createFailedIndexProxy( StoreIndexDescriptor descriptor, IndexPopulationFailure populationFailure )
{
IndexPopulator indexPopulator = populatorFromProvider( descriptor, samplingConfig );
CapableIndexDescriptor capableIndexDescriptor = descriptor.withCapabilities( providerMap );
String indexUserDescription = indexUserDescription( descriptor );
IndexProxy proxy;
proxy = new FailedIndexProxy( capableIndexDescriptor,
indexUserDescription,
indexPopulator,
populationFailure,
new IndexCountsRemover( storeView, descriptor.getId() ),
logProvider );
proxy = new ContractCheckingIndexProxy( proxy, true );
return proxy;
}
private String indexUserDescription( final StoreIndexDescriptor descriptor )
{
return format( "%s [provider: %s]",
descriptor.schema().userDescription( tokenNameLookup ), descriptor.providerDescriptor().toString() );
}
private IndexPopulator populatorFromProvider( StoreIndexDescriptor descriptor, IndexSamplingConfig samplingConfig )
{
IndexProvider indexProvider = providerMap.lookup( descriptor.providerDescriptor() );
return indexProvider.getPopulator( descriptor, samplingConfig );
}
private IndexAccessor onlineAccessorFromProvider( StoreIndexDescriptor descriptor, IndexSamplingConfig samplingConfig ) throws IOException
{
IndexProvider indexProvider = providerMap.lookup( descriptor.providerDescriptor() );
return indexProvider.getOnlineAccessor( descriptor, samplingConfig );
}
}