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CypherCompilerFactory.scala
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CypherCompilerFactory.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.compiler.v3_2
import java.time.Clock
import org.neo4j.cypher.internal.compiler.v3_2.executionplan._
import org.neo4j.cypher.internal.compiler.v3_2.helpers.RuntimeTypeConverter
import org.neo4j.cypher.internal.compiler.v3_2.planner.logical._
import org.neo4j.cypher.internal.compiler.v3_2.phases.{CompilerContext, Transformer}
import org.neo4j.cypher.internal.compiler.v3_2.planner.logical.idp._
import org.neo4j.cypher.internal.frontend.v3_2.ast.Statement
import org.neo4j.cypher.internal.frontend.v3_2.helpers.rewriting.RewriterStepSequencer
import org.neo4j.cypher.internal.frontend.v3_2.phases.Monitors
class CypherCompilerFactory[C <: CompilerContext, T <: Transformer[C]] {
val monitorTag = "cypher3.2"
def costBasedCompiler(config: CypherCompilerConfiguration,
clock: Clock,
monitors: Monitors, logger: InfoLogger,
rewriterSequencer: (String) => RewriterStepSequencer,
plannerName: Option[CostBasedPlannerName],
runtimeName: Option[RuntimeName],
updateStrategy: Option[UpdateStrategy],
typeConverter: RuntimeTypeConverter,
runtimeBuilder: RuntimeBuilder[T],
contextCreator: ContextCreator[C]): CypherCompiler[C] = {
val rewriter = new ASTRewriter(rewriterSequencer)
val metricsFactory = CachedMetricsFactory(SimpleMetricsFactory)
// Pick runtime based on input
val runtimePipeline = runtimeBuilder.create(runtimeName, config.useErrorsOverWarnings)
val planner = plannerName.getOrElse(CostBasedPlannerName.default)
val queryGraphSolver = createQueryGraphSolver(planner, monitors, config)
val actualUpdateStrategy: UpdateStrategy = updateStrategy.getOrElse(defaultUpdateStrategy)
val createFingerprintReference: (Option[PlanFingerprint]) => PlanFingerprintReference =
new PlanFingerprintReference(clock, config.queryPlanTTL, config.statsDivergenceThreshold, _)
val planCacheFactory = () => new LFUCache[Statement, ExecutionPlan](config.queryCacheSize)
monitors.addMonitorListener(logStalePlanRemovalMonitor(logger), monitorTag)
val cacheMonitor = monitors.newMonitor[AstCacheMonitor](monitorTag)
val cache = new MonitoringCacheAccessor[Statement, ExecutionPlan](cacheMonitor)
CypherCompiler(runtimePipeline, rewriter, cache, planCacheFactory, cacheMonitor, monitors, rewriterSequencer,
createFingerprintReference, typeConverter, metricsFactory, queryGraphSolver, config, actualUpdateStrategy, clock,
contextCreator)
}
def createQueryGraphSolver(n: CostBasedPlannerName, monitors: Monitors, config: CypherCompilerConfiguration): QueryGraphSolver = n match {
case IDPPlannerName =>
val monitor = monitors.newMonitor[IDPQueryGraphSolverMonitor]()
val solverConfig = new ConfigurableIDPSolverConfig(
maxTableSize = config.idpMaxTableSize,
iterationDurationLimit = config.idpIterationDuration
)
val singleComponentPlanner = SingleComponentPlanner(monitor, solverConfig)
IDPQueryGraphSolver(singleComponentPlanner, cartesianProductsOrValueJoins, monitor)
case DPPlannerName =>
val monitor = monitors.newMonitor[IDPQueryGraphSolverMonitor]()
val singleComponentPlanner = SingleComponentPlanner(monitor, DPSolverConfig)
IDPQueryGraphSolver(singleComponentPlanner, cartesianProductsOrValueJoins, monitor)
}
private def logStalePlanRemovalMonitor(log: InfoLogger) = new AstCacheMonitor {
override def cacheDiscard(key: Statement, userKey: String) {
log.info(s"Discarded stale query from the query cache: $userKey")
}
}
}