modules/core/src/main/java/org/apache/ignite/internal/visor/VisorCoordinatorNodeTask.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.internal.visor;

import java.util.ArrayList;
import java.util.Collection;
import java.util.UUID;
import org.apache.ignite.cluster.ClusterNode;

/**
 * Base class for Visor tasks intended to execute job on coordinator node.
 */
public abstract class VisorCoordinatorNodeTask<A, R> extends VisorOneNodeTask<A, R> {
    /** {@inheritDoc} */
    @Override protected Collection<UUID> jobNodes(VisorTaskArgument<A> arg) {
        ClusterNode crd = ignite.context().discovery().discoCache().oldestAliveServerNode();

        Collection<UUID> nids = new ArrayList<>(1);

        nids.add(crd == null ? ignite.localNode().id() : crd.id());

        return nids;
    }
}