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TransactionBoundPlanContext.scala
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TransactionBoundPlanContext.scala
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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.cypher.internal.spi.v2_3
import org.neo4j.cypher.MissingIndexException
import org.neo4j.cypher.internal.compiler.v2_3.{IndexDescriptor => CypherIndexDescriptor}
import org.neo4j.cypher.internal.compiler.v2_3.pipes.EntityProducer
import org.neo4j.cypher.internal.compiler.v2_3.pipes.matching.ExpanderStep
import org.neo4j.cypher.internal.compiler.v2_3.spi._
import org.neo4j.cypher.internal.spi.TransactionalContextWrapper
import org.neo4j.graphdb.Node
import org.neo4j.kernel.api.constraints.UniquenessConstraint
import org.neo4j.kernel.api.exceptions.KernelException
import org.neo4j.kernel.api.exceptions.schema.SchemaKernelException
import org.neo4j.kernel.api.index.{InternalIndexState, IndexDescriptor => KernelIndexDescriptor}
import org.neo4j.kernel.impl.transaction.log.TransactionIdStore
import scala.collection.JavaConverters._
class TransactionBoundPlanContext(tc: TransactionalContextWrapper)
extends TransactionBoundTokenContext(tc.statement) with PlanContext with IndexDescriptorCompatibility {
@Deprecated
def getIndexRule(labelName: String, propertyKey: String): Option[CypherIndexDescriptor] = evalOrNone {
val labelId = tc.statement.readOperations().labelGetForName(labelName)
val propertyKeyId = tc.statement.readOperations().propertyKeyGetForName(propertyKey)
getOnlineIndex(tc.statement.readOperations().indexGetForLabelAndPropertyKey(labelId, propertyKeyId))
}
def hasIndexRule(labelName: String): Boolean = {
val labelId = tc.statement.readOperations().labelGetForName(labelName)
val indexDescriptors = tc.statement.readOperations().indexesGetForLabel(labelId).asScala
val onlineIndexDescriptors = indexDescriptors.flatMap(getOnlineIndex)
onlineIndexDescriptors.nonEmpty
}
def getUniqueIndexRule(labelName: String, propertyKey: String): Option[CypherIndexDescriptor] = evalOrNone {
val labelId = tc.statement.readOperations().labelGetForName(labelName)
val propertyKeyId = tc.statement.readOperations().propertyKeyGetForName(propertyKey)
// here we do not need to use getOnlineIndex method because uniqueness constraint creation is synchronous
Some(tc.statement.readOperations().uniqueIndexGetForLabelAndPropertyKey(labelId, propertyKeyId))
}
private def evalOrNone[T](f: => Option[T]): Option[T] =
try { f } catch { case _: SchemaKernelException => None }
private def getOnlineIndex(descriptor: KernelIndexDescriptor): Option[CypherIndexDescriptor] =
tc.statement.readOperations().indexGetState(descriptor) match {
case InternalIndexState.ONLINE => Some(descriptor)
case _ => None
}
def getUniquenessConstraint(labelName: String, propertyKey: String): Option[UniquenessConstraint] = try {
val labelId = tc.statement.readOperations().labelGetForName(labelName)
val propertyKeyId = tc.statement.readOperations().propertyKeyGetForName(propertyKey)
import scala.collection.JavaConverters._
tc.statement.readOperations().constraintsGetForLabelAndPropertyKey(labelId, propertyKeyId).asScala.collectFirst {
case unique: UniquenessConstraint => unique
}
} catch {
case _: KernelException => None
}
def checkNodeIndex(idxName: String) {
if (!tc.statement.readOperations().nodeLegacyIndexesGetAll().contains(idxName)) {
throw new MissingIndexException(idxName)
}
}
def checkRelIndex(idxName: String) {
if (!tc.statement.readOperations().relationshipLegacyIndexesGetAll().contains(idxName)) {
throw new MissingIndexException(idxName)
}
}
def getOrCreateFromSchemaState[T](key: Any, f: => T): T = {
val javaCreator = new java.util.function.Function[Any, T]() {
def apply(key: Any) = f
}
tc.statement.readOperations().schemaStateGetOrCreate(key, javaCreator)
}
// Legacy traversal matchers (pre-Ronja) (These were moved out to remove the dependency on the kernel)
override def monoDirectionalTraversalMatcher(steps: ExpanderStep, start: EntityProducer[Node]) =
new MonoDirectionalTraversalMatcher(steps, start)
override def bidirectionalTraversalMatcher(steps: ExpanderStep,
start: EntityProducer[Node],
end: EntityProducer[Node]) =
new BidirectionalTraversalMatcher(steps, start, end)
val statistics: GraphStatistics =
InstrumentedGraphStatistics(TransactionBoundGraphStatistics(tc.readOperations), new MutableGraphStatisticsSnapshot())
val txIdProvider: () => Long = tc.graph
.getDependencyResolver
.resolveDependency(classOf[TransactionIdStore])
.getLastCommittedTransactionId
}