| /* |
| * 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.examples.cluster; |
| |
| import org.apache.ignite.Ignite; |
| import org.apache.ignite.IgniteCluster; |
| import org.apache.ignite.IgniteException; |
| import org.apache.ignite.Ignition; |
| import org.apache.ignite.cluster.ClusterGroup; |
| import org.apache.ignite.examples.ExampleNodeStartup; |
| import org.apache.ignite.examples.ExamplesUtils; |
| |
| /** |
| * Demonstrates new functional APIs. |
| * <p> |
| * Remote nodes should always be started with special configuration file which |
| * enables P2P class loading: {@code 'ignite.{sh|bat} examples/config/example-ignite.xml'}. |
| * <p> |
| * Alternatively you can run {@link ExampleNodeStartup} in another JVM which will start node |
| * with {@code examples/config/example-ignite.xml} configuration. |
| */ |
| public class ClusterGroupExample { |
| /** |
| * Executes example. |
| * |
| * @param args Command line arguments, none required. |
| * @throws IgniteException If example execution failed. |
| */ |
| public static void main(String[] args) throws IgniteException { |
| try (Ignite ignite = Ignition.start("examples/config/example-ignite.xml")) { |
| if (!ExamplesUtils.checkMinTopologySize(ignite.cluster(), 2)) |
| return; |
| |
| System.out.println(); |
| System.out.println("Compute example started."); |
| |
| IgniteCluster cluster = ignite.cluster(); |
| |
| // Say hello to all nodes in the cluster, including local node. |
| sayHello(ignite, cluster); |
| |
| // Say hello to all remote nodes. |
| sayHello(ignite, cluster.forRemotes()); |
| |
| // Pick random node out of remote nodes. |
| ClusterGroup randomNode = cluster.forRemotes().forRandom(); |
| |
| // Say hello to a random node. |
| sayHello(ignite, randomNode); |
| |
| // Say hello to all nodes residing on the same host with random node. |
| sayHello(ignite, cluster.forHost(randomNode.node())); |
| |
| // Say hello to all nodes that have current CPU load less than 50%. |
| sayHello(ignite, cluster.forPredicate(n -> n.metrics().getCurrentCpuLoad() < 0.5)); |
| } |
| } |
| |
| /** |
| * Print 'Hello' message on remote nodes. |
| * |
| * @param ignite Ignite. |
| * @param grp Cluster group. |
| * @throws IgniteException If failed. |
| */ |
| private static void sayHello(Ignite ignite, final ClusterGroup grp) throws IgniteException { |
| // Print out hello message on all cluster nodes. |
| ignite.compute(grp).broadcast( |
| () -> System.out.println(">>> Hello Node: " + grp.ignite().cluster().localNode().id())); |
| } |
| } |