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ReadableTransactionState.java
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ReadableTransactionState.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.storageengine.api.txstate;
import org.eclipse.collections.api.set.primitive.MutableLongSet;
import org.neo4j.internal.kernel.api.IndexQuery;
import org.neo4j.internal.kernel.api.exceptions.schema.ConstraintValidationException;
import org.neo4j.internal.kernel.api.exceptions.schema.CreateConstraintFailureException;
import org.neo4j.internal.kernel.api.schema.SchemaDescriptor;
import org.neo4j.internal.kernel.api.schema.constraints.ConstraintDescriptor;
import org.neo4j.kernel.api.schema.index.IndexDescriptor;
import org.neo4j.kernel.impl.api.state.GraphState;
import org.neo4j.storageengine.api.RelationshipVisitor;
import org.neo4j.values.storable.Value;
import org.neo4j.values.storable.ValueGroup;
import org.neo4j.values.storable.ValueTuple;
/**
* This interface contains the methods for reading transaction state from the transaction state.
* The implementation of these methods should be free of any side effects (such as initialising lazy state).
*/
public interface ReadableTransactionState
{
void accept( TxStateVisitor visitor ) throws ConstraintValidationException, CreateConstraintFailureException;
boolean hasChanges();
// ENTITY RELATED
/**
* Returns all nodes that, in this tx, have had the labels changed.
* @param label
*/
LongDiffSets nodesWithLabelChanged( long label );
/**
* Returns nodes that have been added and removed in this tx.
*/
LongDiffSets addedAndRemovedNodes();
/**
* Returns rels that have been added and removed in this tx.
*/
LongDiffSets addedAndRemovedRelationships();
/**
* Nodes that have had labels, relationships, or properties modified in this tx.
*/
Iterable<NodeState> modifiedNodes();
/**
* Rels that have properties modified in this tx.
*/
Iterable<RelationshipState> modifiedRelationships();
boolean relationshipIsAddedInThisTx( long relationshipId );
boolean relationshipIsDeletedInThisTx( long relationshipId );
LongDiffSets nodeStateLabelDiffSets( long nodeId );
boolean nodeIsAddedInThisTx( long nodeId );
boolean nodeIsDeletedInThisTx( long nodeId );
/**
* @return {@code true} if the relationship was visited in this state, i.e. if it was created
* by this current transaction, otherwise {@code false} where the relationship might need to be
* visited from the store.
*/
<EX extends Exception> boolean relationshipVisit( long relId, RelationshipVisitor<EX> visitor ) throws EX;
// SCHEMA RELATED
ReadableDiffSets<IndexDescriptor> indexDiffSetsByLabel( int labelId );
ReadableDiffSets<IndexDescriptor> indexDiffSetsBySchema( SchemaDescriptor schema );
ReadableDiffSets<IndexDescriptor> indexChanges();
Iterable<IndexDescriptor> constraintIndexesCreatedInTx();
ReadableDiffSets<ConstraintDescriptor> constraintsChanges();
ReadableDiffSets<ConstraintDescriptor> constraintsChangesForLabel( int labelId );
ReadableDiffSets<ConstraintDescriptor> constraintsChangesForSchema( SchemaDescriptor descriptor );
ReadableDiffSets<ConstraintDescriptor> constraintsChangesForRelationshipType( int relTypeId );
Long indexCreatedForConstraint( ConstraintDescriptor constraint );
LongDiffSets indexUpdatesForScan( IndexDescriptor index );
LongDiffSets indexUpdatesForSuffixOrContains( IndexDescriptor index, IndexQuery query );
LongDiffSets indexUpdatesForSeek( IndexDescriptor index, ValueTuple values );
LongDiffSets indexUpdatesForRangeSeek( IndexDescriptor index, ValueGroup valueGroup,
Value lower, boolean includeLower,
Value upper, boolean includeUpper );
LongDiffSets indexUpdatesForRangeSeekByPrefix( IndexDescriptor index, String prefix );
NodeState getNodeState( long id );
RelationshipState getRelationshipState( long id );
GraphState getGraphState();
MutableLongSet augmentLabels( MutableLongSet labels, NodeState nodeState );
/**
* The way tokens are created is that the first time a token is needed it gets created in its own little
* token mini-transaction, separate from the surrounding transaction that creates or modifies data that need it.
* From the kernel POV it's interesting to know whether or not any tokens have been created in this tx state,
* because then we know it's a mini-transaction like this and won't have to let transaction event handlers
* know about it, for example.
*
* The same applies to schema changes, such as creating and dropping indexes and constraints.
*/
boolean hasDataChanges();
}