/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF 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.
 */

package org.apache.ignite.internal;

import java.io.Serializable;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicReference;
import org.apache.ignite.Ignite;
import org.apache.ignite.IgniteException;
import org.apache.ignite.IgniteLogger;
import org.apache.ignite.cluster.ClusterNode;
import org.apache.ignite.compute.ComputeJob;
import org.apache.ignite.compute.ComputeJobAdapter;
import org.apache.ignite.compute.ComputeJobResult;
import org.apache.ignite.compute.ComputeTaskAdapter;
import org.apache.ignite.configuration.IgniteConfiguration;
import org.apache.ignite.internal.util.typedef.G;
import org.apache.ignite.resources.IgniteInstanceResource;
import org.apache.ignite.resources.LoggerResource;
import org.apache.ignite.spi.collision.jobstealing.JobStealingCollisionSpi;
import org.apache.ignite.spi.failover.jobstealing.JobStealingFailoverSpi;
import org.apache.ignite.testframework.GridTestUtils;
import org.apache.ignite.testframework.junits.common.GridCommonAbstractTest;
import org.apache.ignite.testframework.junits.common.GridCommonTest;
import org.jetbrains.annotations.Nullable;

/**
 * Multithreaded job stealing test.
 */
@GridCommonTest(group = "Kernal Self")
public class GridMultithreadedJobStealingSelfTest extends GridCommonAbstractTest {
    /** */
    private Ignite ignite;

    /** */
    public GridMultithreadedJobStealingSelfTest() {
        super(false /* don't start grid*/);
    }

    /** {@inheritDoc} */
    @Override protected void beforeTest() throws Exception {
        ignite = startGridsMultiThreaded(2);
    }

    /** {@inheritDoc} */
    @Override protected void afterTest() throws Exception {
        ignite = null;

        stopAllGrids();
    }

    /**
     * Test 2 jobs on 2 nodes.
     *
     * @throws Exception If test failed.
     */
    public void testTwoJobsMultithreaded() throws Exception {
        final AtomicReference<Exception> fail = new AtomicReference<>(null);

        final AtomicInteger stolen = new AtomicInteger(0);
        final AtomicInteger noneStolen = new AtomicInteger(0);

        int threadsNum = 10;

        GridTestUtils.runMultiThreaded(new Runnable() {
            /** */
            @Override public void run() {
                try {
                    JobStealingResult res = ignite.compute().execute(JobStealingTask.class, null);

                    info("Task result: " + res);

                    switch(res) {
                        case NONE_STOLEN : {
                            noneStolen.addAndGet(2);
                            break;
                        }
                        case ONE_STOLEN : {
                            noneStolen.addAndGet(1);
                            stolen.addAndGet(1);
                            break;
                        }
                        case BOTH_STOLEN: {
                            stolen.addAndGet(2);
                            break;
                        }
                        default: {
                            assert false : "Result is: " + res;
                        }
                    }
                }
                catch (IgniteException e) {
                    log.error("Failed to execute task.", e);

                    fail.getAndSet(e);
                }
            }
        }, threadsNum, "JobStealingThread");

        for (Ignite g : G.allGrids())
            info("Metrics [nodeId=" + g.cluster().localNode().id() +
                ", metrics=" + g.cluster().localNode().metrics() + ']');

        assert fail.get() == null : "Test failed with exception: " + fail.get();

        // Total jobs number is threadsNum * 2
        assert stolen.get() + noneStolen.get() == threadsNum * 2 : "Incorrect processed jobs number";

        assert stolen.get() != 0 : "No jobs were stolen.";

        // Under these circumstances we should not have  more than 2 jobs
        // difference.
        //(but muted to 3 due to very rare fails and low priority of fix)
        assert Math.abs(stolen.get() - noneStolen.get()) <= 3 : "Stats [stolen=" + stolen +
            ", noneStolen=" + noneStolen + ']';
    }

    /** {@inheritDoc} */
    @Override protected IgniteConfiguration getConfiguration(String gridName) throws Exception {
        IgniteConfiguration cfg = super.getConfiguration(gridName);

        JobStealingCollisionSpi colSpi = new JobStealingCollisionSpi();

        // One job at a time.
        colSpi.setActiveJobsThreshold(1);
        colSpi.setWaitJobsThreshold(0);

        JobStealingFailoverSpi failSpi = new JobStealingFailoverSpi();

        // Verify defaults.
        assert failSpi.getMaximumFailoverAttempts() == JobStealingFailoverSpi.DFLT_MAX_FAILOVER_ATTEMPTS;

        cfg.setCollisionSpi(colSpi);
        cfg.setFailoverSpi(failSpi);

        return cfg;
    }

    /**
     * Job stealing task.
     */
    private static class JobStealingTask extends ComputeTaskAdapter<Object, JobStealingResult> {
        /** Grid. */
        @IgniteInstanceResource
        private Ignite ignite;

        /** Logger. */
        @LoggerResource
        private IgniteLogger log;

        /** {@inheritDoc} */
        @SuppressWarnings("ForLoopReplaceableByForEach")
            @Override public Map<? extends ComputeJob, ClusterNode> map(List<ClusterNode> subgrid,
            @Nullable Object arg) {
            assert subgrid.size() == 2 : "Invalid subgrid size: " + subgrid.size();

            Map<ComputeJobAdapter, ClusterNode> map = new HashMap<>(subgrid.size());

            // Put all jobs onto local node.
            for (int i = 0; i < subgrid.size(); i++)
                map.put(new GridJobStealingJob(2000L), ignite.cluster().localNode());

            return map;
        }

        /** {@inheritDoc} */
        @Override public JobStealingResult reduce(List<ComputeJobResult> results) {
            assert results.size() == 2;

            for (ComputeJobResult res : results)
                log.info("Job result: " + res.getData());

            Object obj0 = results.get(0).getData();

            if (obj0.equals(results.get(1).getData())) {
                if (obj0.equals(ignite.name()))
                    return JobStealingResult.NONE_STOLEN;

                return JobStealingResult.BOTH_STOLEN;
            }

            return JobStealingResult.ONE_STOLEN;
        }
    }

    /**
     * Job stealing job.
     */
    private static final class GridJobStealingJob extends ComputeJobAdapter {
        /** Injected grid. */
        @IgniteInstanceResource
        private Ignite ignite;

        /**
         * @param arg Job argument.
         */
        GridJobStealingJob(Long arg) {
            super(arg);
        }

        /** {@inheritDoc} */
        @Override public Serializable execute() {
            try {
                Long sleep = argument(0);

                assert sleep != null;

                Thread.sleep(sleep);
            }
            catch (InterruptedException e) {
                throw new IgniteException("Job got interrupted.", e);
            }

            return ignite.name();
        }
    }

    /**
     * Job stealing result.
     */
    private enum JobStealingResult {
        /** */
        BOTH_STOLEN,

        /** */
        ONE_STOLEN,

        /** */
        NONE_STOLEN
    }
}
@@ -4821,17 +4821,17 @@
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@@ -4935,9 +4935,9 @@
  %3C= 
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Test hotfix