/*
 * 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.platform;

import org.apache.ignite.Ignite;
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.resources.IgniteInstanceResource;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.UUID;

/**
 * Task collecting IDs of all nodes where it was executed.
 */
public class PlatformComputeBroadcastTask extends ComputeTaskAdapter<Object, Collection<UUID>> {
    /** {@inheritDoc} */
    @NotNull @Override public Map<? extends ComputeJob, ClusterNode> map(List<ClusterNode> subgrid, @Nullable Object arg) {
        Map<ComputeJob, ClusterNode> jobs = new HashMap<>();

        for (ClusterNode node : subgrid)
            jobs.put(new BroadcastJob(), node);

        return jobs;
    }

    /** {@inheritDoc} */
    @Nullable @Override public Collection<UUID> reduce(List<ComputeJobResult> results) {
        List<UUID> ids = new ArrayList<>();

        for (ComputeJobResult res : results)
            ids.add((UUID)res.getData());

        return ids;
    }

    /**
     * Job.
     */
    private static class BroadcastJob extends ComputeJobAdapter {
        /** */
        @IgniteInstanceResource
        private Ignite ignite;

        /** {@inheritDoc} */
        @Nullable @Override public Object execute() {
            try {
                Thread.sleep(50); // Short sleep for cancellation tests.
            }
            catch (InterruptedException ignored) {
                // No-op.
            }

            return ignite.cluster().localNode().id();
        }
    }
}
