modules/core/src/test/java/org/apache/ignite/platform/PlatformComputeEchoArgTask.java

/*
 * 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 java.util.Collections;
import java.util.List;
import java.util.Map;
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.internal.util.typedef.F;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

/** Test task that result is the passed arguments. */
public class PlatformComputeEchoArgTask extends ComputeTaskAdapter<Object, Object> {
    /** {@inheritDoc} */
    @NotNull @Override public Map<? extends ComputeJob, ClusterNode> map(List<ClusterNode> subgrid,
        @Nullable Object arg) {
        return Collections.singletonMap(new EchoArgJob(arg), F.first(subgrid));
    }

    /** {@inheritDoc} */
    @Nullable @Override public Object reduce(List<ComputeJobResult> results) {
        return results.get(0).getData();
    }

    /** Job. */
    private static class EchoArgJob extends ComputeJobAdapter {
        /** Argument. */
        private Object arg;

        /** @param arg Job result. */
        private EchoArgJob(Object arg) {
            this.arg = arg;
        }

        /** {@inheritDoc} */
        @Nullable @Override public Object execute() {
            return arg;
        }
    }
}