You can mark Hazelcast Distributed Objects with @SpringAware if the object wants:
- to apply bean properties,
- to apply factory callbacks such as
ApplicationContextAware
,BeanNameAware
, - to apply bean post-processing annotations such as
InitializingBean
,@PostConstruct
.
Hazelcast Distributed ExecutorService
, or more generally any Hazelcast managed object, can benefit from these features. To enable SpringAware objects, you must first configure HazelcastInstance
using hazelcast namespace as explained in Configuring Spring and add <hz:spring-aware />
tag.
SpringAware Examples
- Configure a Hazelcast Instance (3.3.x) via Spring Configuration and define someBean as Spring Bean.
- Add
<hz:spring-aware />
to Hazelcast configuration to enable @SpringAware.
<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.xsd">
<context:annotation-config />
<hz:hazelcast id="instance">
<hz:config>
<hz:spring-aware />
<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>
Distributed Map SpringAware Example:
- Create a class called
SomeValue
which contains Spring Bean definitions likeApplicationContext
andSomeBean
.
@SpringAware
@Component("someValue")
@Scope("prototype")
public class SomeValue implements Serializable, ApplicationContextAware {
private transient ApplicationContext context;
private transient SomeBean someBean;
private transient boolean init = false;
public void setApplicationContext( ApplicationContext applicationContext )
throws BeansException {
context = applicationContext;
}
@Autowired
public void setSomeBean( SomeBean someBean) {
this.someBean = someBean;
}
@PostConstruct
public void init() {
someBean.doSomethingUseful();
init = true;
}
...
}
- Get
SomeValue
Object from Context and put it into Hazelcast Distributed Map on the first member.
HazelcastInstance hazelcastInstance =
(HazelcastInstance) context.getBean( "hazelcast" );
SomeValue value = (SomeValue) context.getBean( "someValue" )
IMap<String, SomeValue> map = hazelcastInstance.getMap( "values" );
map.put( "key", value );
- Read
SomeValue
Object from Hazelcast Distributed Map and assert thatinit
method is called since it is annotated with@PostConstruct
.
HazelcastInstance hazelcastInstance =
(HazelcastInstance) context.getBean( "hazelcast" );
IMap<String, SomeValue> map = hazelcastInstance.getMap( "values" );
SomeValue value = map.get( "key" );
Assert.assertTrue( value.init );
ExecutorService SpringAware Example:
- Create a Callable Class called SomeTask which contains Spring Bean definitions like
ApplicationContext
,SomeBean
.
@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( ApplicationContext applicationContext )
throws BeansException {
context = applicationContext;
}
@Autowired
public void setSomeBean( SomeBean someBean ) {
this.someBean = someBean;
}
}
- Submit
SomeTask
to two Hazelcast Members and assert thatsomeBean
is autowired.
HazelcastInstance hazelcastInstance =
(HazelcastInstance) context.getBean( "hazelcast" );
SomeBean bean = (SomeBean) context.getBean( "someBean" );
Future<Long> f = hazelcastInstance.getExecutorService().submit(new SomeTask());
Assert.assertEquals(bean.value, f.get().longValue());
// choose a member
Member member = hazelcastInstance.getCluster().getMembers().iterator().next();
Future<Long> f2 = (Future<Long>) hazelcast.getExecutorService()
.submitToMember(new SomeTask(), member);
Assert.assertEquals(bean.value, f2.get().longValue());
NOTE: Spring managed properties/fields are marked as transient
.