Java-处理模式 [英] Java - dispose pattern

问题描述

我想确保正确处置我的对象( Class<?extended Object> )，因为其他实例可能会保存它们使用的数据.例如，用于机密数据的DEK/KEK对.

I want to make sure that my Objects (Class <? extends Object>) are properly disposed of, because other instances may hold data that are used by them. Example, a DEK/KEK pair for secret data.

由于通常不赞成覆盖 finalize()，因此如何使IDE警告并强制使开发人员调用 dispose()是将Object引用设置为null，还是将其自动设置为null(例如退出方法)?

Since Overriding finalize() is generally frowned upon, how do I make the IDE warn and force the developer to call dispose() iff the Object reference is set to null, or would be automatically set to null (example exiting a method)?

假定源代码在我的直接控制下，而IDE是Netbeans.

Assuming source code is under my direct control, and the IDE is Netbeans.

推荐答案

首先，值得一提的是，在Java 9中不推荐使用终结器，而推荐使用

First of all, worth to mention that finalizers were deprecated in Java 9 in favour of the Cleaner. Probably this would be the better option then the one I will describe below. Didn't tried it yet though.

谈到问题本身:我会尝试这样做:

Speaking about the question itself: I'd try doing it that way:

1. 假设存在一个类型为A的对象，该对象实现了 Closeable .
2. 使用唯一的方法制作类S: void execute(Consumer< A> Consumer).
3. 在方法 execute 中:实例化类型A的对象，将其传递给使用者( accept )，然后将其关闭.
4. 在客户端代码中-始终使用S，将lambda作为使用者传递给它.在lambda中-您将获得A的实例，而S可以保证将其处置.
5. 使所有构造函数对类A的可见性仅限于服务S(例如，使它们成为程序包私有的，并将A与S放在同一程序包中).这样可以防止将A实例化到S之外并使其不受管理.

1. Assuming there is an object of type A, which implements Closeable.
2. Make a class S with the only method: void execute(Consumer<A> consumer).
3. In the method execute: instantiate object of type A, pass it to consumer (accept) then close it.
4. In the client code - always use S, passing a lambda to it as a consumer. In lambda - you will get the instance of A and S will guarantee disposal of it.
5. Make all constructors' visibility of class A limited to only the service S (like, make them package-private and place A in the same package with S). That will prevent A to be instantiated outside of S and left unmanaged.

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