/*
* 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.misc.schedule;
import java.util.concurrent.Callable;
import org.apache.ignite.Ignite;
import org.apache.ignite.IgniteException;
import org.apache.ignite.Ignition;
import org.apache.ignite.examples.ExampleNodeStartup;
import org.apache.ignite.lang.IgniteRunnable;
import org.apache.ignite.scheduler.SchedulerFuture;
/**
* Demonstrates a cron-based {@link Runnable} execution scheduling.
* Test runnable object broadcasts a phrase to all cluster nodes every minute
* three times with initial scheduling delay equal to five seconds.
* <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 ComputeScheduleExample {
/**
* 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")) {
System.out.println();
System.out.println("Compute schedule example started.");
// Schedule output message every minute.
SchedulerFuture<?> fut = ignite.scheduler().scheduleLocal(
new Callable<Integer>() {
private int invocations;
@Override public Integer call() {
invocations++;
ignite.compute().broadcast(
new IgniteRunnable() {
@Override public void run() {
System.out.println();
System.out.println("Howdy! :)");
}
}
);
return invocations;
}
},
"{5, 3} * * * * *" // Cron expression.
);
while (!fut.isDone())
System.out.println(">>> Invocation #: " + fut.get());
System.out.println();
System.out.println(">>> Schedule future is done and has been unscheduled.");
System.out.println(">>> Check all nodes for hello message output.");
}
}
}