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SchemaStorage.java
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SchemaStorage.java
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/*
* Copyright (c) 2002-2017 "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 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.store;
import java.util.Collection;
import java.util.Iterator;
import java.util.function.Predicate;
import org.neo4j.function.Predicates;
import org.neo4j.helpers.collection.PrefetchingIterator;
import org.neo4j.kernel.api.exceptions.schema.DuplicateSchemaRuleException;
import org.neo4j.kernel.api.exceptions.schema.MalformedSchemaRuleException;
import org.neo4j.kernel.api.exceptions.schema.SchemaRuleNotFoundException;
import org.neo4j.kernel.api.schema.SchemaDescriptor;
import org.neo4j.kernel.api.schema.SchemaDescriptorPredicates;
import org.neo4j.kernel.api.schema.constaints.ConstraintDescriptor;
import org.neo4j.kernel.api.schema.index.IndexDescriptor;
import org.neo4j.kernel.impl.store.record.ConstraintRule;
import org.neo4j.kernel.impl.store.record.DynamicRecord;
import org.neo4j.kernel.impl.store.record.IndexRule;
import org.neo4j.kernel.impl.store.record.RecordLoad;
import org.neo4j.storageengine.api.schema.SchemaRule;
public class SchemaStorage implements SchemaRuleAccess
{
private final RecordStore<DynamicRecord> schemaStore;
public SchemaStorage( RecordStore<DynamicRecord> schemaStore )
{
this.schemaStore = schemaStore;
}
/**
* Find the IndexRule that matches the given IndexDescriptor.
*
* @return the matching IndexRule, or null if no matching IndexRule was found
* @throws IllegalStateException if more than one matching rule.
* @param descriptor the target IndexDescriptor
*/
public IndexRule indexGetForSchema( final IndexDescriptor descriptor )
{
Iterator<IndexRule> rules = loadAllSchemaRules( descriptor::isSame, IndexRule.class, false );
IndexRule foundRule = null;
while ( rules.hasNext() )
{
IndexRule candidate = rules.next();
if ( foundRule != null )
{
throw new IllegalStateException( String.format(
"Found more than one matching index rule, %s and %s", foundRule, candidate ) );
}
foundRule = candidate;
}
return foundRule;
}
public Iterator<IndexRule> indexesGetAll()
{
return loadAllSchemaRules( Predicates.alwaysTrue(), IndexRule.class, false );
}
public Iterator<ConstraintRule> constraintsGetAll()
{
return loadAllSchemaRules( Predicates.alwaysTrue(), ConstraintRule.class, false );
}
public Iterator<ConstraintRule> constraintsGetAllIgnoreMalformed()
{
return loadAllSchemaRules( Predicates.alwaysTrue(), ConstraintRule.class, true );
}
public Iterator<ConstraintRule> constraintsGetForRelType( int relTypeId )
{
return loadAllSchemaRules( rule -> SchemaDescriptorPredicates.hasRelType( rule, relTypeId ),
ConstraintRule.class, false );
}
public Iterator<ConstraintRule> constraintsGetForLabel( int labelId )
{
return loadAllSchemaRules( rule -> SchemaDescriptorPredicates.hasLabel( rule, labelId ),
ConstraintRule.class, false );
}
public Iterator<ConstraintRule> constraintsGetForSchema( SchemaDescriptor schemaDescriptor )
{
return loadAllSchemaRules( SchemaDescriptor.equalTo( schemaDescriptor ), ConstraintRule.class, false );
}
/**
* Get the constraint rule that matches the given ConstraintDescriptor
* @param descriptor the ConstraintDescriptor to match
* @return the matching ConstrainRule
* @throws SchemaRuleNotFoundException if no ConstraintRule matches the given descriptor
* @throws DuplicateSchemaRuleException if two or more ConstraintRules match the given descriptor
*/
public ConstraintRule constraintsGetSingle( final ConstraintDescriptor descriptor )
throws SchemaRuleNotFoundException, DuplicateSchemaRuleException
{
Iterator<ConstraintRule> rules = loadAllSchemaRules( descriptor::isSame, ConstraintRule.class, false );
if ( !rules.hasNext() )
{
throw new SchemaRuleNotFoundException( SchemaRule.Kind.map( descriptor ), descriptor.schema() );
}
ConstraintRule rule = rules.next();
if ( rules.hasNext() )
{
throw new DuplicateSchemaRuleException( SchemaRule.Kind.map( descriptor ), descriptor.schema() );
}
return rule;
}
public Iterator<SchemaRule> loadAllSchemaRules()
{
return loadAllSchemaRules( Predicates.alwaysTrue(), SchemaRule.class, false );
}
@Override
public SchemaRule loadSingleSchemaRule( long ruleId ) throws MalformedSchemaRuleException
{
Collection<DynamicRecord> records;
try
{
records = schemaStore.getRecords( ruleId, RecordLoad.NORMAL );
}
catch ( Exception e )
{
throw new MalformedSchemaRuleException( e.getMessage(), e );
}
return SchemaStore.readSchemaRule( ruleId, records, newRecordBuffer() );
}
/**
* Scans the schema store and loads all {@link SchemaRule rules} in it. This method is written with the assumption
* that there's no id reuse on schema records.
*
* @param predicate filter when loading.
* @param returnType type of {@link SchemaRule} to load.
* @param ignoreMalformed whether or not to ignore inconsistent records (used in concsistency checking).
* @return {@link Iterator} of the loaded schema rules, lazily loaded when advancing the iterator.
*/
<ReturnType extends SchemaRule> Iterator<ReturnType> loadAllSchemaRules(
final Predicate<ReturnType> predicate,
final Class<ReturnType> returnType,
final boolean ignoreMalformed )
{
return new PrefetchingIterator<ReturnType>()
{
private final long highestId = schemaStore.getHighestPossibleIdInUse();
private long currentId = 1; /*record 0 contains the block size*/
private final byte[] scratchData = newRecordBuffer();
private final DynamicRecord record = schemaStore.newRecord();
@Override
protected ReturnType fetchNextOrNull()
{
while ( currentId <= highestId )
{
long id = currentId++;
schemaStore.getRecord( id, record, RecordLoad.FORCE );
if ( record.inUse() && record.isStartRecord() )
{
// It may be that concurrently to our reading there's a transaction dropping the schema rule
// that we're reading and that rule may have spanned multiple dynamic records.
try
{
Collection<DynamicRecord> records;
try
{
records = schemaStore.getRecords( id, RecordLoad.NORMAL );
}
catch ( InvalidRecordException e )
{
// This may have been due to a concurrent drop of this rule.
continue;
}
SchemaRule schemaRule = SchemaStore.readSchemaRule( id, records, scratchData );
if ( returnType.isInstance( schemaRule ) )
{
ReturnType returnRule = returnType.cast( schemaRule );
if ( predicate.test( returnRule ) )
{
return returnRule;
}
}
}
catch ( MalformedSchemaRuleException e )
{
if ( !ignoreMalformed )
{
throw new RuntimeException( e );
}
}
}
}
return null;
}
};
}
public long newRuleId()
{
return schemaStore.nextId();
}
private byte[] newRecordBuffer()
{
return new byte[schemaStore.getRecordSize() * 4];
}
}