创建支持实习的对象的良好模式？ [英] Good pattern for creating an object that supports interning?

问题描述

我需要一个支持实习的类，例如Java的 String 类。当创建Class的实例时，如果具有相同参数的引用已经存在，它将返回一个预先存在的引用。否则应该返回一个新的引用。这样：

I need a Class that supports interning, like Java's String class. When creating an instance of the Class it should return a pre-existing reference if a reference with the same parameters already exists. Otherwise it should return a new reference. Such that:

Foo a = new Foo(5);
Foo b = new Foo(5);
Foo c = new Foo(6);
a == b
a != c

1）一个工厂维护预先存在的对象的表，还是表一般只是一个静态变量在类本身内？

1) Is it the job of a factory to maintain the table of pre-existing objects, or is the table generally just a static variable within the class itself?

2）现有的对象？是每一次请求一个实例时搜索的一组对象，还是一个地图，其中键是对象，值是参数？

2) What is the table of pre-existing objects? Is it a Set of objects you search through every time an instance is requested, or is it a Map where keys are objects and values are parameters?

推荐答案

有两件事情出现在我的脑海里

Two things come to my mind

1. Flyweight Pattern

Guava's ComputingMap

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