/*
* Copyright 2009-2010 Rickard Öberg AB
*
* Licensed 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.qi4j.library.circuitbreaker.jmx;
import java.util.Random;
import javax.management.MBeanServer;
import org.qi4j.api.activation.ActivationException;
import org.qi4j.bootstrap.AssemblyException;
import org.qi4j.bootstrap.ModuleAssembly;
import org.qi4j.bootstrap.SingletonAssembler;
import org.qi4j.library.circuitbreaker.CircuitBreaker;
import org.qi4j.library.circuitbreaker.CircuitBreakers;
import org.qi4j.library.circuitbreaker.service.ServiceCircuitBreaker;
import org.qi4j.library.jmx.MBeanServerImporter;
/**
* Run this as a program and connect with VisualVM. That way you can monitor changes in attributes, notifications, and
* execute operations on the CircuitBreaker through JMX.
*/
public class CircuitBreakerManagementSample
{
public static void main( String[] args )
throws ActivationException, AssemblyException
{
SingletonAssembler assembler = new SingletonAssembler()
{
@Override
// START SNIPPET: jmx
public void assemble( ModuleAssembly module )
throws AssemblyException
{
// END SNIPPET: jmx
CircuitBreaker cb = new CircuitBreaker( 3, 250, CircuitBreakers.in( IllegalArgumentException.class ) );
module.importedServices( TestService.class ).setMetaInfo( new TestService( cb ) );
// START SNIPPET: jmx
// JMX Library
module.importedServices( MBeanServer.class ).
importedBy( MBeanServerImporter.class );
// CircuitBreakers in JMX
module.services( CircuitBreakerManagement.class ).
instantiateOnStartup();
}
// END SNIPPET: jmx
};
TestService service = assembler.module().<TestService>findService( TestService.class ).get();
int interval = 1; // Seconds
System.out.println( "CircuitBreaker JMX Support sample is now started." );
System.out.println();
System.out.println( "A Service that randomly output some text or fail is called through a CircuitBreaker every " + interval + " seconds." );
System.out.println( "In a few interval the CircuitBreaker will be turned off." );
System.out.println( "Connect with a MBean browser (eg. VisualVM + MBean plugin) to use the turnOn operation on the CircuitBreakers." );
System.out.println();
System.out.println( "Hit Ctrl-C to stop." );
System.out.println();
while ( true ) {
try {
Thread.sleep( interval * 1000 );
} catch ( InterruptedException e ) {
e.printStackTrace();
}
service.helloWorld();
}
}
public static class TestService
implements ServiceCircuitBreaker
{
CircuitBreaker cb;
Random random = new Random();
public TestService( CircuitBreaker cb )
{
this.cb = cb;
}
@Override
public CircuitBreaker circuitBreaker()
{
return cb;
}
public void helloWorld()
{
if ( random.nextDouble() > 0.3 ) {
cb.throwable( new Throwable( "Failed" ) );
} else {
cb.success();
}
}
}
}