/*
* Copyright 2016 the original author or authors.
*
* 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.springframework.statemachine.cluster;
import static org.hamcrest.Matchers.contains;
import static org.hamcrest.Matchers.is;
import static org.junit.Assert.assertThat;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import org.apache.curator.framework.CuratorFramework;
import org.junit.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.statemachine.StateMachine;
import org.springframework.statemachine.config.EnableStateMachineFactory;
import org.springframework.statemachine.config.StateMachineConfigurerAdapter;
import org.springframework.statemachine.config.StateMachineFactory;
import org.springframework.statemachine.config.builders.StateMachineConfigurationConfigurer;
import org.springframework.statemachine.config.builders.StateMachineStateConfigurer;
import org.springframework.statemachine.config.builders.StateMachineTransitionConfigurer;
import org.springframework.statemachine.ensemble.EnsembleListenerAdapter;
import org.springframework.statemachine.ensemble.StateMachineEnsemble;
public class LeaderZookeeperStateMachineEnsembleTests extends AbstractZookeeperTests {
@Override
protected AnnotationConfigApplicationContext buildContext() {
return new AnnotationConfigApplicationContext();
}
@Test
@SuppressWarnings("unchecked")
public void testLeader() throws Exception {
context.register(ZkServerConfig.class, BaseConfig.class, Config1.class);
context.refresh();
StateMachineFactory<String, String> factory = context.getBean(StateMachineFactory.class);
StateMachineEnsemble<String, String> stateMachineEnsemble = context.getBean(StateMachineEnsemble.class);
TestEnsembleListener listener = context.getBean(TestEnsembleListener.class);
StateMachine<String, String> machine1 = factory.getStateMachine();
assertThat(machine1.getState().getIds(), contains("S1"));
assertThat(listener.latch.await(2, TimeUnit.SECONDS), is(true));
assertThat(stateMachineEnsemble.getLeader(), is(machine1));
listener.reset(1);
StateMachine<String, String> machine2 = factory.getStateMachine();
stateMachineEnsemble.leave(machine1);
assertThat(listener.latch.await(2, TimeUnit.SECONDS), is(true));
assertThat(stateMachineEnsemble.getLeader(), is(machine2));
}
@Configuration
@EnableStateMachineFactory
static class Config1 extends StateMachineConfigurerAdapter<String, String> {
@Autowired
private CuratorFramework curatorClient;
@Override
public void configure(StateMachineConfigurationConfigurer<String, String> config) throws Exception {
config
.withConfiguration()
.autoStartup(true)
.and()
.withDistributed()
.ensemble(stateMachineEnsemble());
}
@Override
public void configure(StateMachineStateConfigurer<String, String> states) throws Exception {
states
.withStates()
.initial("S1")
.state("S2")
.state("S3");
}
@Override
public void configure(StateMachineTransitionConfigurer<String, String> transitions) throws Exception {
transitions
.withExternal()
.source("S1").target("S2")
.event("E1")
.and()
.withExternal()
.source("S2").target("S3")
.event("E2")
.and()
.withExternal()
.source("S3").target("S1")
.event("E3");
}
@Bean
public StateMachineEnsemble<String, String> stateMachineEnsemble() throws Exception {
LeaderZookeeperStateMachineEnsemble<String,String> ensemble = new LeaderZookeeperStateMachineEnsemble<String, String>(curatorClient, "/foo");
ensemble.addEnsembleListener(testEnsembleListener());
return ensemble;
}
@Bean
public TestEnsembleListener testEnsembleListener() {
return new TestEnsembleListener();
}
}
static class TestEnsembleListener extends EnsembleListenerAdapter<String, String> {
CountDownLatch latch = new CountDownLatch(1);
@Override
public void ensembleLeaderGranted(StateMachine<String, String> stateMachine) {
latch.countDown();
}
void reset(int a1) {
latch = new CountDownLatch(a1);
}
}
}