CODEWITHSUNDEEP
javaspring
LuckyLuke
LuckyLuke

Reputation: 49097

Emitting events from spring managed bean to listeners

I want to create a event notifier in my Repository layer so I can add listeners. I am using Spring and I wonder if this a okey way of doing it? Or are there better ways to implement notifying/listeners in Spring?

@Repository
public class JdbcRepository {

    private List<InsertListener> insertListeners;

    public void insert(final SomeObject object) {
        // Ommited code for brewity
        for (InsertListener listener : insertListeners) {
            listener.notifiy(...);
        }
    }
}

Spring config xml

<bean id="jdbcRepository" class="mypackage.JdbcRepository">
    <property>
        <bean ref="myRepositoryListeners" />
    </property>
</bean>

<bean id="myRepositoryListeners" class="java.util.List">
    <constructor-arg>
    <list>
        <ref bean="..." />
        <ref bean="..." />
    </list>
    </constructor-arg>
</bean>

Upvotes: 1

Views: 164

Answers (2)

Evgeniy Dorofeev
Evgeniy Dorofeev

Reputation: 136042

You can do it this way 

public class JdbcRepository {
    @Autowired
    ApplicationContext context;
    Collection<InsertListener> listeners;

    @PostConstruct
    public void init() {
        listeners = context.getBeansOfType(InsertListener.class).values();
    }
...

context.xml

<context:annotation-config />
<bean id="l1" class="InsertListener" />
<bean id="l2" class="InsertListener" />
<bean id="repo" class="JdbcRepository" />

Upvotes: 1

Michail Nikolaev
Michail Nikolaev

Reputation: 3775

Take a look for Guava events and some Spring support for it.

Upvotes: 0

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