Jersey 2 资源需要清理

Question

我有一个在其构造函数中创建对象的单例资源，当应用程序关闭且服务器终止时，我需要释放这些对象。 Jersey 2 是如何做到的？

@Path("/")
@Singleton
public class MyResource {
    private Map<String, MyObject> cache;

    public MyResource() {
        cache = new ConcurrentHashMap<>();
        // at some point I need to remove all entries
        // from the map and close all MyObject objects there
        //
        // the reason is because MyObject might have files open
        // and I need to close the files
        //
        // where can I do that?
    }
    ...
}

Answer 1

Jersey 支持 @PreDestroy 生命周期钩子。所以只要在class中用@PreDestroy注解一个方法，Jersey就会在资源释放前调用它

import javax.annotation.PreDestroy;

@Path("/")
@Singleton
public class MyResource {
    private Map<String, MyObject> cache;

    public MyResource() {
    }

    @PreDestroy
    public void preDestroy() {
        // do cleanup
    }
}

Jersey 2 资源需要清理

Jersey 2 resource needs to cleanup

java

jersey-2.0