/*
 * 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.client.thin;

import java.util.List;
import java.util.Map;
import java.util.concurrent.atomic.AtomicBoolean;
import org.apache.ignite.IgniteException;
import org.apache.ignite.cluster.ClusterNode;
import org.apache.ignite.compute.ComputeJob;
import org.apache.ignite.compute.ComputeJobResult;
import org.apache.ignite.compute.ComputeJobResultPolicy;
import org.apache.ignite.compute.ComputeTask;
import org.apache.ignite.internal.util.typedef.F;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

/**
 * Task to test failover.
 */
public class TestFailoverTask implements ComputeTask<Long, Boolean> {
    /** */
    private final AtomicBoolean firstJobProcessed = new AtomicBoolean();

    /** */
    private volatile boolean failedOver;

    /** {@inheritDoc} */
    @Override public @NotNull Map<? extends ComputeJob, ClusterNode> map(List<ClusterNode> subgrid,
                                                                         @Nullable Long arg) throws IgniteException {
        return F.asMap(new TestJob(null), subgrid.get(0));
    }

    /** {@inheritDoc} */
    @Override public ComputeJobResultPolicy result(ComputeJobResult res, List<ComputeJobResult> rcvd) {
        if (firstJobProcessed.compareAndSet(false, true))
            return ComputeJobResultPolicy.FAILOVER;
        else {
            failedOver = true;

            return ComputeJobResultPolicy.WAIT;
        }
    }

    /** {@inheritDoc} */
    @Nullable @Override public Boolean reduce(List<ComputeJobResult> results) throws IgniteException {
        return failedOver;
    }
}