fine-grained & coarse grained
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Fine-grained和Coarse-grained 一般是指远程方法调用的接口的颗粒大小.
比如, 我有一个远程对象, 他有很多属性和对应的getter和setter方法,
如果我们远程调用对象每个属性的getter和setter方法, 就会产生很多远程方法调用. 这就是Fine-grained interface, 会造成性能问题
所以我们可以用一个setdata或getdata的方法把一些属性的访问封装起来, 只用一个远程方法传输一个data transfer object来对该对象进行赋值和访问, 这就是Coarse-grained interface
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