9.2.9.2. Fire and Observe Events
Example 9.15. Fire an event
This code shows an event being injected and used in a method.
public class AccountManager { @Inject Event<Withdrawal> event; public boolean transfer(Account a, Account b) { ... event.fire(new Withdrawal(a)); } }
Example 9.16. Fire an event with a qualifier
You can annotate your event injection with a qualifier, to make it more specific. For more information about qualifiers, see Section 9.2.3.2, “About Qualifiers”.
public class AccountManager { @Inject @Suspicious Event <Withdrawal> event; public boolean transfer(Account a, Account b) { ... event.fire(new Withdrawal(a)); } }
Example 9.17. Observe an event
To observe an event, use the
@Observes
annotation.
public class AccountObserver { void checkTran(@Observes Withdrawal w) { ... } }
Example 9.18. Observe a qualified event
You can use qualifiers to observe only specific types of events. For more information about qualifiers, see Section 9.2.3.2, “About Qualifiers”.
public class AccountObserver { void checkTran(@Observes @Suspicious Withdrawal w) { ... } }