It's often desired to access Spring managed beans, to apply bean properties or to apply factory callbacks
such as ApplicationContextAware
, BeanNameAware
or to apply bean post-processing
such as InitializingBean
, @PostConstruct
like annotations
while using Hazelcast distributed ExecutorService
or DistributedTask
s or more
generally any Hazelcast managed object. Achieving those features are as simple as adding @SpringAware
annotation to your distributed object types. Once you have configured HazelcastInstance as explained in
Spring configuration,
just mark any distributed type with @SpringAware
annotation.
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:hz="http://www.hazelcast.com/schema/spring" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.hazelcast.com/schema/spring http://www.hazelcast.com/schema/spring/hazelcast-spring-2.3.xsd"> <context:annotation-config /> <hz:hazelcast id="instance"> <hz:config> <hz:group name="dev" password="password"/> <hz:network port="5701" port-auto-increment="false"> <hz:join> <hz:multicast enabled="false" /> <hz:tcp-ip enabled="true"> <hz:members>10.10.1.2, 10.10.1.3</hz:members> </hz:tcp-ip> </hz:join> </hz:network> ... </hz:config> </hz:hazelcast> <bean id="someBean" class="com.hazelcast.examples.spring.SomeBean" scope="singleton" /> ... </beans>
ExecutorService example:
@SpringAware public class SomeTask implements Callable<Long>, ApplicationContextAware, Serializable { private transient ApplicationContext context; private transient SomeBean someBean; public Long call() throws Exception { return someBean.value; } public void setApplicationContext(final ApplicationContext applicationContext) throws BeansException { context = applicationContext; } @Autowired public void setSomeBean(final SomeBean someBean) { this.someBean = someBean; } }
HazelcastInstance hazelcast = (HazelcastInstance) context.getBean("hazelcast"); SomeBean bean = (SomeBean) context.getBean("someBean"); Future<Long> f = hazelcast.getExecutorService().submit(new SomeTask()); Assert.assertEquals(bean.value, f.get().longValue()); // choose a member Member member = hazelcast.getCluster().getMembers().iterator().next(); Future<Long> f2 = (Future<Long>) hazelcast.getExecutorService() .submit(new DistributedTask<Long>(new SomeTask(), member)); Assert.assertEquals(bean.value, f2.get().longValue());
Distributed Map value example:
@SpringAware @Component("someValue") @Scope("prototype") public class SomeValue implements Serializable, ApplicationContextAware { transient ApplicationContext context; transient SomeBean someBean; transient boolean init = false; public void setApplicationContext(final ApplicationContext applicationContext) throws BeansException { context = applicationContext; } @Autowired public void setSomeBean(final SomeBean someBean) { this.someBean = someBean; } @PostConstruct public void init() { someBean.doSomethingUseful(); init = true; } ... }
On Node-1;
HazelcastInstance hazelcast = (HazelcastInstance) context.getBean("hazelcast"); SomeValue value = (SomeValue) context.getBean("someValue") IMap<String, SomeValue> map = hazelcast.getMap("values"); map.put("key", value);
On Node-2;
HazelcastInstance hazelcast = (HazelcastInstance) context.getBean("hazelcast"); IMap<String, SomeValue> map = hazelcast.getMap("values"); SomeValue value = map.get("key"); Assert.assertTrue(value.init);
Note that, Spring managed properties/fields are marked as transient
.