/*
* Licensed to CRATE Technology GmbH ("Crate") under one or more contributor
* license agreements. See the NOTICE file distributed with this work for
* additional information regarding copyright ownership. Crate licenses
* this file to you under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License. You may
* obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
* However, if you have executed another commercial license agreement
* with Crate these terms will supersede the license and you may use the
* software solely pursuant to the terms of the relevant commercial agreement.
*/
package io.crate.operation.collect;
import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.ListenableFuture;
import io.crate.analyze.EvaluatingNormalizer;
import io.crate.executor.TaskResult;
import io.crate.executor.transport.TransportActionProvider;
import io.crate.metadata.Functions;
import io.crate.metadata.ReferenceResolver;
import io.crate.operation.ImplementationSymbolVisitor;
import io.crate.operation.Input;
import io.crate.operation.projectors.FlatProjectorChain;
import io.crate.operation.projectors.ProjectionToProjectorVisitor;
import io.crate.planner.RowGranularity;
import io.crate.planner.node.dql.CollectNode;
import org.apache.lucene.search.CollectionTerminatedException;
import org.elasticsearch.cluster.ClusterService;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.logging.ESLogger;
import org.elasticsearch.common.logging.Loggers;
import org.elasticsearch.common.settings.Settings;
import java.util.List;
import java.util.Set;
public class HandlerSideDataCollectOperation implements CollectOperation<Object[][]> {
private ESLogger logger = Loggers.getLogger(getClass());
private final EvaluatingNormalizer clusterNormalizer;
private final ImplementationSymbolVisitor implementationVisitor;
private final ProjectionToProjectorVisitor projectorVisitor;
private final InformationSchemaCollectService informationSchemaCollectService;
private final UnassignedShardsCollectService unassignedShardsCollectService;
@Inject
public HandlerSideDataCollectOperation(ClusterService clusterService,
Settings settings,
TransportActionProvider transportActionProvider,
Functions functions,
ReferenceResolver referenceResolver,
InformationSchemaCollectService informationSchemaCollectService,
UnassignedShardsCollectService unassignedShardsCollectService) {
this.informationSchemaCollectService = informationSchemaCollectService;
this.unassignedShardsCollectService = unassignedShardsCollectService;
this.clusterNormalizer = new EvaluatingNormalizer(functions, RowGranularity.CLUSTER, referenceResolver);
this.implementationVisitor = new ImplementationSymbolVisitor(referenceResolver, functions, RowGranularity.CLUSTER);
this.projectorVisitor = new ProjectionToProjectorVisitor(
clusterService, settings,
transportActionProvider,
implementationVisitor, clusterNormalizer);
}
@Override
public ListenableFuture<Object[][]> collect(CollectNode collectNode) {
if (collectNode.isPartitioned()) {
// edge case: partitioned table without actual indices
// no results
return Futures.immediateFuture(TaskResult.EMPTY_RESULT.rows());
}
if (collectNode.maxRowGranularity() == RowGranularity.DOC) {
// we assume information schema here
return handleWithService(informationSchemaCollectService, collectNode);
} else if (collectNode.maxRowGranularity() == RowGranularity.CLUSTER) {
return handleCluster(collectNode);
} else if (collectNode.maxRowGranularity() == RowGranularity.SHARD) {
return handleWithService(unassignedShardsCollectService, collectNode);
} else {
return Futures.immediateFailedFuture(new IllegalStateException("unsupported routing"));
}
}
private ListenableFuture<Object[][]> handleCluster(CollectNode collectNode) {
collectNode = collectNode.normalize(clusterNormalizer);
if (collectNode.whereClause().noMatch()) {
return Futures.immediateFuture(TaskResult.EMPTY_RESULT.rows());
}
assert collectNode.toCollect().size() > 0;
// resolve Implementations
ImplementationSymbolVisitor.Context ctx = implementationVisitor.process(collectNode);
List<Input<?>> inputs = ctx.topLevelInputs();
Set<CollectExpression<?>> collectExpressions = ctx.collectExpressions();
FlatProjectorChain projectorChain = new FlatProjectorChain(collectNode.projections(), projectorVisitor);
SimpleOneRowCollector collector = new SimpleOneRowCollector(
inputs, collectExpressions, projectorChain.firstProjector());
projectorChain.startProjections();
try {
collector.doCollect();
} catch (Exception e) {
return Futures.immediateFailedFuture(e);
}
return projectorChain.result();
}
private ListenableFuture<Object[][]> handleWithService(CollectService collectService, CollectNode node) {
FlatProjectorChain projectorChain = new FlatProjectorChain(node.projections(), projectorVisitor);
CrateCollector collector = collectService.getCollector(node, projectorChain.firstProjector());
projectorChain.startProjections();
try {
collector.doCollect();
} catch (CollectionTerminatedException ex) {
// ignore
} catch (Exception e) {
return Futures.immediateFailedFuture(e);
}
return projectorChain.result();
}
}