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GraphDbStructureGuide.java
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GraphDbStructureGuide.java
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/*
* Copyright (c) 2002-2016 "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.util.dbstructure;
import java.util.Iterator;
import org.neo4j.graphdb.DependencyResolver;
import org.neo4j.graphdb.GraphDatabaseService;
import org.neo4j.graphdb.Label;
import org.neo4j.graphdb.RelationshipType;
import org.neo4j.graphdb.Transaction;
import org.neo4j.helpers.collection.Visitable;
import org.neo4j.kernel.internal.GraphDatabaseAPI;
import org.neo4j.kernel.api.ReadOperations;
import org.neo4j.kernel.api.Statement;
import org.neo4j.kernel.api.StatementTokenNameLookup;
import org.neo4j.kernel.api.TokenNameLookup;
import org.neo4j.kernel.api.constraints.NodePropertyExistenceConstraint;
import org.neo4j.kernel.api.constraints.PropertyConstraint;
import org.neo4j.kernel.api.constraints.RelationshipPropertyExistenceConstraint;
import org.neo4j.kernel.api.constraints.UniquenessConstraint;
import org.neo4j.kernel.api.exceptions.KernelException;
import org.neo4j.kernel.api.exceptions.index.IndexNotFoundKernelException;
import org.neo4j.kernel.api.index.IndexDescriptor;
import org.neo4j.kernel.impl.core.ThreadToStatementContextBridge;
import static java.lang.String.format;
import static org.neo4j.kernel.api.ReadOperations.ANY_LABEL;
import static org.neo4j.kernel.api.ReadOperations.ANY_RELATIONSHIP_TYPE;
public class GraphDbStructureGuide implements Visitable<DbStructureVisitor>
{
private static RelationshipType WILDCARD_REL_TYPE = new RelationshipType()
{
@Override
public String name()
{
return "";
}
};
private final GraphDatabaseService db;
private final ThreadToStatementContextBridge bridge;
public GraphDbStructureGuide( GraphDatabaseService graph )
{
this.db = graph;
DependencyResolver dependencies = ((GraphDatabaseAPI) graph).getDependencyResolver();
this.bridge = dependencies.resolveDependency( ThreadToStatementContextBridge.class );
}
public void accept( DbStructureVisitor visitor )
{
try ( Transaction tx = db.beginTx() )
{
try ( Statement statement = bridge.get() )
{
showStructure( statement, visitor );
}
tx.success();
}
}
private void showStructure( Statement statement, DbStructureVisitor visitor )
{
ReadOperations read = statement.readOperations();
try
{
showTokens( visitor, read );
showSchema( visitor, read );
showStatistics( visitor, read );
}
catch (KernelException e)
{
throw new IllegalStateException( "Kernel exception when traversing database schema structure and statistics. This is not expected to happen.", e );
}
}
private void showTokens( DbStructureVisitor visitor, ReadOperations read )
{
showLabels( read, visitor );
showPropertyKeys( read, visitor );
showRelTypes( read, visitor );
}
private void showLabels( ReadOperations read, DbStructureVisitor visitor )
{
for ( Label label : db.getAllLabels() )
{
int labelId = read.labelGetForName( label.name() );
visitor.visitLabel( labelId, label.name() );
}
}
private void showPropertyKeys( ReadOperations read, DbStructureVisitor visitor )
{
for ( String propertyKeyName : db.getAllPropertyKeys() )
{
int propertyKeyId = read.propertyKeyGetForName( propertyKeyName );
visitor.visitPropertyKey( propertyKeyId, propertyKeyName );
}
}
private void showRelTypes( ReadOperations read, DbStructureVisitor visitor )
{
for ( RelationshipType relType : db.getAllRelationshipTypes() )
{
int relTypeId = read.relationshipTypeGetForName( relType.name() );
visitor.visitRelationshipType( relTypeId, relType.name() );
}
}
private void showSchema( DbStructureVisitor visitor, ReadOperations read ) throws IndexNotFoundKernelException
{
TokenNameLookup nameLookup = new StatementTokenNameLookup( read );
showIndices( visitor, read, nameLookup );
showUniqueIndices( visitor, read, nameLookup );
showUniqueConstraints( visitor, read, nameLookup );
}
private void showIndices( DbStructureVisitor visitor, ReadOperations read, TokenNameLookup nameLookup ) throws IndexNotFoundKernelException
{
Iterator<IndexDescriptor> indexDescriptors = read.indexesGetAll();
while ( indexDescriptors.hasNext() )
{
IndexDescriptor descriptor = indexDescriptors.next();
String userDescription = descriptor.userDescription( nameLookup );
double uniqueValuesPercentage = read.indexUniqueValuesSelectivity( descriptor );
long size = read.indexSize( descriptor );
visitor.visitIndex( descriptor, userDescription , uniqueValuesPercentage, size );
}
}
private void showUniqueIndices( DbStructureVisitor visitor, ReadOperations read, TokenNameLookup nameLookup ) throws IndexNotFoundKernelException
{
Iterator<IndexDescriptor> indexDescriptors = read.uniqueIndexesGetAll();
while ( indexDescriptors.hasNext() )
{
IndexDescriptor descriptor = indexDescriptors.next();
String userDescription = descriptor.userDescription( nameLookup );
double uniqueValuesPercentage = read.indexUniqueValuesSelectivity( descriptor );
long size = read.indexSize( descriptor );
visitor.visitUniqueIndex( descriptor, userDescription, uniqueValuesPercentage, size );
}
}
private void showUniqueConstraints( DbStructureVisitor visitor, ReadOperations read, TokenNameLookup nameLookup )
{
Iterator<PropertyConstraint> constraints = read.constraintsGetAll();
while ( constraints.hasNext() )
{
PropertyConstraint constraint = constraints.next();
String userDescription = constraint.userDescription( nameLookup );
if ( constraint instanceof UniquenessConstraint )
{
visitor.visitUniqueConstraint( (UniquenessConstraint) constraint, userDescription );
}
else if ( constraint instanceof NodePropertyExistenceConstraint )
{
NodePropertyExistenceConstraint existenceConstraint = (NodePropertyExistenceConstraint) constraint;
visitor.visitNodePropertyExistenceConstraint( existenceConstraint, userDescription );
}
else if ( constraint instanceof RelationshipPropertyExistenceConstraint )
{
RelationshipPropertyExistenceConstraint existenceConstraint = (RelationshipPropertyExistenceConstraint) constraint;
visitor.visitRelationshipPropertyExistenceConstraint( existenceConstraint, userDescription );
}
else
{
throw new IllegalArgumentException( "Unknown constraint type: " + constraint.getClass() + ", " +
"constraint: " + constraint );
}
}
}
private void showStatistics( DbStructureVisitor visitor, ReadOperations read )
{
showNodeCounts( read, visitor );
showRelCounts( read, visitor );
}
private void showNodeCounts( ReadOperations read, DbStructureVisitor visitor )
{
visitor.visitAllNodesCount( read.countsForNode( ANY_LABEL ) );
for ( Label label : db.getAllLabels() )
{
int labelId = read.labelGetForName( label.name() );
visitor.visitNodeCount( labelId, label.name(), read.countsForNode( labelId ) );
}
}
private void showRelCounts( ReadOperations read, DbStructureVisitor visitor )
{
// all wildcards
noSide( read, visitor, WILDCARD_REL_TYPE, ANY_RELATIONSHIP_TYPE );
// one label only
for ( Label label : db.getAllLabels() )
{
int labelId = read.labelGetForName( label.name() );
leftSide( read, visitor, label, labelId, WILDCARD_REL_TYPE, ANY_RELATIONSHIP_TYPE );
rightSide( read, visitor, label, labelId, WILDCARD_REL_TYPE, ANY_RELATIONSHIP_TYPE );
}
// fixed rel type
for ( RelationshipType relType : db.getAllRelationshipTypes() )
{
int relTypeId = read.relationshipTypeGetForName( relType.name() );
noSide( read, visitor, relType, relTypeId );
for ( Label label : db.getAllLabels() )
{
int labelId = read.labelGetForName( label.name() );
// wildcard on right
leftSide( read, visitor, label, labelId, relType, relTypeId );
// wildcard on left
rightSide( read, visitor, label, labelId, relType, relTypeId );
}
}
}
private void noSide( ReadOperations read, DbStructureVisitor visitor, RelationshipType relType, int relTypeId )
{
String userDescription = format("MATCH ()-[%s]->() RETURN count(*)", colon( relType.name() ));
long amount = read.countsForRelationship( ANY_LABEL, relTypeId, ANY_LABEL );
visitor.visitRelCount( ANY_LABEL, relTypeId, ANY_LABEL, userDescription, amount );
}
private void leftSide( ReadOperations read, DbStructureVisitor visitor, Label label, int labelId, RelationshipType relType, int relTypeId )
{
String userDescription = format( "MATCH (%s)-[%s]->() RETURN count(*)", colon( label.name() ), colon( relType.name() ) );
long amount = read.countsForRelationship( labelId, relTypeId, ANY_LABEL );
visitor.visitRelCount( labelId, relTypeId, ANY_LABEL, userDescription, amount );
}
private void rightSide( ReadOperations read, DbStructureVisitor visitor, Label label, int labelId, RelationshipType relType, int relTypeId )
{
String userDescription = format( "MATCH ()-[%s]->(%s) RETURN count(*)", colon( relType.name() ), colon( label.name() ) );
long amount = read.countsForRelationship( ANY_LABEL, relTypeId, labelId );
visitor.visitRelCount( ANY_LABEL, relTypeId, labelId, userDescription, amount );
}
private String colon( String name )
{
return name.length() == 0 ? name : (":" + name);
}
}