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TemporalIndexCache.java
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TemporalIndexCache.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.index.schema;
import java.io.IOException;
import java.io.UncheckedIOException;
import java.util.function.Function;
import org.neo4j.function.ThrowingSupplier;
import org.neo4j.values.storable.ValueGroup;
import static org.neo4j.kernel.impl.index.schema.TemporalIndexCache.Offset.date;
import static org.neo4j.kernel.impl.index.schema.TemporalIndexCache.Offset.duration;
import static org.neo4j.kernel.impl.index.schema.TemporalIndexCache.Offset.localDateTime;
import static org.neo4j.kernel.impl.index.schema.TemporalIndexCache.Offset.localTime;
import static org.neo4j.kernel.impl.index.schema.TemporalIndexCache.Offset.zonedDateTime;
import static org.neo4j.kernel.impl.index.schema.TemporalIndexCache.Offset.zonedTime;
/**
* Cache for lazily creating parts of the temporal index. Each part is created using the factory
* the first time it is selected in a select() query, or the first time it's explicitly
* asked for using e.g. date().
* <p>
* Iterating over the cache will return all currently created parts.
*
* @param <T> Type of parts
*/
class TemporalIndexCache<T> extends IndexPartsCache<TemporalIndexCache.Offset,T>
{
private final Factory<T> factory;
enum Offset
{
date,
localDateTime,
zonedDateTime,
localTime,
zonedTime,
duration
}
TemporalIndexCache( Factory<T> factory )
{
this.factory = factory;
}
/**
* Select the path corresponding to the given ValueGroup. Creates the path if needed,
* and rethrows any create time exception as a RuntimeException.
*
* @param valueGroup target value group
* @return selected part
*/
T uncheckedSelect( ValueGroup valueGroup )
{
switch ( valueGroup )
{
case DATE:
return date();
case LOCAL_DATE_TIME:
return localDateTime();
case ZONED_DATE_TIME:
return zonedDateTime();
case LOCAL_TIME:
return localTime();
case ZONED_TIME:
return zonedTime();
case DURATION:
return duration();
default:
throw new IllegalStateException( "Unsupported value group " + valueGroup );
}
}
/**
* Select the part corresponding to the given ValueGroup. Creates the part if needed,
* in which case an exception of type E might be thrown.
*
* @param valueGroup target value group
* @return selected part
*/
T select( ValueGroup valueGroup ) throws IOException
{
try
{
return uncheckedSelect( valueGroup );
}
catch ( UncheckedIOException e )
{
throw e.getCause();
}
}
/**
* Select the part corresponding to the given ValueGroup, apply function to it and return the result.
* If the part isn't created yet return orElse.
*
* @param valueGroup target value group
* @param function function to apply to part
* @param orElse result to return if part isn't created yet
* @param <RESULT> type of result
* @return the result
*/
<RESULT> RESULT selectOrElse( ValueGroup valueGroup, Function<T,RESULT> function, RESULT orElse )
{
T cachedValue;
switch ( valueGroup )
{
case DATE:
cachedValue = cache.get( date );
break;
case LOCAL_DATE_TIME:
cachedValue = cache.get( localDateTime );
break;
case ZONED_DATE_TIME:
cachedValue = cache.get( zonedDateTime );
break;
case LOCAL_TIME:
cachedValue = cache.get( localTime );
break;
case ZONED_TIME:
cachedValue = cache.get( zonedTime );
break;
case DURATION:
cachedValue = cache.get( duration );
break;
default:
throw new IllegalStateException( "Unsupported value group " + valueGroup );
}
return cachedValue != null ? function.apply( cachedValue ) : orElse;
}
private T getOrCreatePart( Offset key, ThrowingSupplier<T,IOException> factory ) throws UncheckedIOException
{
T existing = cache.get( key );
if ( existing != null )
{
return existing;
}
// Instantiate from factory. Do this under lock so that we coordinate with any concurrent call to close.
// Concurrent calls to instantiating parts won't contend with each other since there's only
// a single writer at a time anyway.
instantiateCloseLock.lock();
try
{
assertOpen();
return cache.computeIfAbsent( key, k ->
{
try
{
return factory.get();
}
catch ( IOException e )
{
throw new UncheckedIOException( e );
}
} );
}
finally
{
instantiateCloseLock.unlock();
}
}
private T date() throws UncheckedIOException
{
return getOrCreatePart( date, factory::newDate );
}
private T localDateTime() throws UncheckedIOException
{
return getOrCreatePart( localDateTime, factory::newLocalDateTime );
}
private T zonedDateTime() throws UncheckedIOException
{
return getOrCreatePart( zonedDateTime, factory::newZonedDateTime );
}
private T localTime() throws UncheckedIOException
{
return getOrCreatePart( localTime, factory::newLocalTime );
}
private T zonedTime() throws UncheckedIOException
{
return getOrCreatePart( zonedTime, factory::newZonedTime );
}
private T duration() throws UncheckedIOException
{
return getOrCreatePart( duration, factory::newDuration );
}
void loadAll()
{
try
{
date();
zonedDateTime();
localDateTime();
zonedTime();
localTime();
duration();
}
catch ( Exception e )
{
throw new RuntimeException( e );
}
}
/**
* Factory used by the TemporalIndexCache to create parts.
*
* @param <T> Type of parts
*/
interface Factory<T>
{
T newDate() throws IOException;
T newLocalDateTime() throws IOException;
T newZonedDateTime() throws IOException;
T newLocalTime() throws IOException;
T newZonedTime() throws IOException;
T newDuration() throws IOException;
}
}