org.infinispan.factories.annotations.Inject Maven / Gradle / Ivy
package org.infinispan.factories.annotations;
import org.infinispan.factories.AbstractComponentFactory;
import org.infinispan.factories.ComponentRegistry;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
/**
* Used to annotate a method as one that is used to inject a registered component into another component. The component
* to be constructed must be built using the {@link AbstractComponentFactory#construct(Class)} method, or if your object
* that needs components injected into it already exists, it can be built using the {@link
* ComponentRegistry#wireDependencies(Object)} method.
*
* Usage example:
*
* public class MyClass
* {
* private TransactionManager tm;
* private BuddyManager bm;
* private Notifier n;
*
* &Inject
* public void setTransactionManager(TransactionManager tm)
* {
* this.tm = tm;
* }
*
* &Inject
* public void injectMoreStuff(BuddyManager bm, Notifier n)
* {
* this.bm = bm;
* this.n = n;
* }
* }
*
*
* and an instance of this class can be constructed and wired using
*
* MyClass myClass = componentFactory.construct(MyClass.class); // instance will have dependencies injected.
*
*
* Methods annotated with this Inject annotation should *only* set class fields. They should do nothing else.
* If you need to do some work to prepare the component for use, do it in a {@link @Start} method since this is only
* called once when a component starts.
*
* @author Manik Surtani
* @since 4.0
*/
// ensure this annotation is available at runtime.
@Retention(RetentionPolicy.RUNTIME)
// only applies to fields.
@Target(ElementType.METHOD)
public @interface Inject {
}