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IndexProcedures.java
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IndexProcedures.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.builtinprocs;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import org.neo4j.function.Predicates;
import org.neo4j.kernel.api.KernelTransaction;
import org.neo4j.kernel.api.schema.NodePropertyDescriptor;
import org.neo4j.kernel.api.ReadOperations;
import org.neo4j.kernel.api.Statement;
import org.neo4j.kernel.api.exceptions.ProcedureException;
import org.neo4j.kernel.api.exceptions.Status;
import org.neo4j.kernel.api.exceptions.index.IndexNotFoundKernelException;
import org.neo4j.kernel.api.exceptions.schema.SchemaRuleNotFoundException;
import org.neo4j.kernel.api.index.InternalIndexState;
import org.neo4j.kernel.api.schema_new.index.NewIndexDescriptor;
import org.neo4j.kernel.impl.api.index.IndexingService;
import org.neo4j.kernel.impl.api.index.sampling.IndexSamplingMode;
public class IndexProcedures implements AutoCloseable
{
private final Statement statement;
private final ReadOperations operations;
private final IndexingService indexingService;
public IndexProcedures( KernelTransaction tx, IndexingService indexingService )
{
statement = tx.acquireStatement();
operations = statement.readOperations();
this.indexingService = indexingService;
}
public void awaitIndex( String indexSpecification, long timeout, TimeUnit timeoutUnits )
throws ProcedureException
{
IndexSpecifier index = parse( indexSpecification );
int labelId = getLabelId( index.label() );
int propertyKeyId = getPropertyKeyId( index.property() );
//TODO: Support composite indexes
waitUntilOnline( getIndex( labelId, propertyKeyId, index ), index, timeout, timeoutUnits );
}
public void resampleIndex( String indexSpecification ) throws ProcedureException
{
IndexSpecifier index = parse( indexSpecification );
int labelId = getLabelId( index.label() );
int propertyKeyId = getPropertyKeyId( index.property() );
//TODO: Support composite indexes
try
{
triggerSampling( getIndex( labelId, propertyKeyId, index ) );
}
catch ( IndexNotFoundKernelException e )
{
throw new ProcedureException( e.status(), e.getMessage(), e );
}
}
public void resampleOutdatedIndexes()
{
indexingService.triggerIndexSampling( IndexSamplingMode.TRIGGER_REBUILD_UPDATED );
}
private IndexSpecifier parse( String specification )
{
return new IndexSpecifier( specification );
}
private int getLabelId( String labelName ) throws ProcedureException
{
int labelId = operations.labelGetForName( labelName );
if ( labelId == ReadOperations.NO_SUCH_LABEL )
{
throw new ProcedureException( Status.Schema.LabelAccessFailed, "No such label %s", labelName );
}
return labelId;
}
private int getPropertyKeyId( String propertyKeyName ) throws ProcedureException
{
int propertyKeyId = operations.propertyKeyGetForName( propertyKeyName );
if ( propertyKeyId == ReadOperations.NO_SUCH_PROPERTY_KEY )
{
throw new ProcedureException( Status.Schema.PropertyKeyAccessFailed,
"No such property key %s", propertyKeyName );
}
return propertyKeyId;
}
private NewIndexDescriptor getIndex( int labelId, int propertyKeyId, IndexSpecifier index ) throws
ProcedureException
{
try
{
return operations.indexGetForLabelAndPropertyKey( new NodePropertyDescriptor( labelId, propertyKeyId ) );
}
catch ( SchemaRuleNotFoundException e )
{
throw new ProcedureException( Status.Schema.IndexNotFound, e, "No index on %s", index );
}
}
private void waitUntilOnline( NewIndexDescriptor index, IndexSpecifier indexDescription,
long timeout, TimeUnit timeoutUnits )
throws ProcedureException
{
try
{
Predicates.awaitEx( () -> isOnline( indexDescription, index ), timeout, timeoutUnits );
}
catch ( TimeoutException e )
{
throw new ProcedureException( Status.Procedure.ProcedureTimedOut,
"Index on %s did not come online within %s %s", indexDescription, timeout, timeoutUnits );
}
}
private boolean isOnline( IndexSpecifier indexDescription, NewIndexDescriptor index ) throws ProcedureException
{
InternalIndexState state = getState( indexDescription, index );
switch ( state )
{
case POPULATING:
return false;
case ONLINE:
return true;
case FAILED:
throw new ProcedureException( Status.Schema.IndexCreationFailed,
"Index on %s is in failed state", indexDescription );
default:
throw new IllegalStateException( "Unknown index state " + state );
}
}
private InternalIndexState getState( IndexSpecifier indexDescription, NewIndexDescriptor index )
throws ProcedureException
{
try
{
return operations.indexGetState( index );
}
catch ( IndexNotFoundKernelException e )
{
throw new ProcedureException( Status.Schema.IndexNotFound, e, "No index on %s", indexDescription );
}
}
private void triggerSampling( NewIndexDescriptor index ) throws IndexNotFoundKernelException
{
indexingService.triggerIndexSampling( index.schema(), IndexSamplingMode.TRIGGER_REBUILD_ALL );
}
@Override
public void close()
{
statement.close();
}
}