io.crate.executor.task.join.NestedLoopTask.java Source code

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Here is the source code for io.crate.executor.task.join.NestedLoopTask.java

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/*
 * 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.executor.task.join;

import com.google.common.base.Optional;
import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.ListenableFuture;
import com.google.common.util.concurrent.SettableFuture;
import io.crate.breaker.RamAccountingContext;
import io.crate.core.concurrent.ForwardingFutureCallback;
import io.crate.executor.*;
import io.crate.operation.join.NestedLoopOperation;
import io.crate.operation.projectors.ProjectionToProjectorVisitor;
import io.crate.planner.node.dql.join.NestedLoopNode;
import org.elasticsearch.common.breaker.CircuitBreaker;

import java.util.Arrays;
import java.util.List;
import java.util.Locale;
import java.util.UUID;

public class NestedLoopTask extends JobTask implements PageableTask {

    private NestedLoopOperation operation;
    private final SettableFuture<TaskResult> result = SettableFuture.create();
    private final List<ListenableFuture<TaskResult>> results = Arrays.<ListenableFuture<TaskResult>>asList(result);

    public NestedLoopTask(UUID jobId, String nodeId, NestedLoopNode nestedLoopNode, List<Task> outerTasks,
            List<Task> innerTasks, TaskExecutor executor, ProjectionToProjectorVisitor projectionToProjectorVisitor,
            CircuitBreaker circuitBreaker) {
        super(jobId);
        String ramContextId = String.format(Locale.ENGLISH, "%s: %s", nodeId, jobId.toString());
        RamAccountingContext ramAccountingContext = new RamAccountingContext(ramContextId, circuitBreaker);
        operation = new NestedLoopOperation(nestedLoopNode, outerTasks, innerTasks, executor,
                projectionToProjectorVisitor, ramAccountingContext);
    }

    @Override
    public void start(PageInfo pageInfo) {
        Futures.addCallback(operation.execute(Optional.of(pageInfo)), new ForwardingFutureCallback<>(result));
    }

    @Override
    public void start() {
        Futures.addCallback(operation.execute(Optional.<PageInfo>absent()), new ForwardingFutureCallback<>(result));
    }

    @Override
    public List<ListenableFuture<TaskResult>> result() {
        return results;
    }

    @Override
    public void upstreamResult(List<ListenableFuture<TaskResult>> result) {
        // ignore
    }
}