刚开始看VMM，请教~

wangfang221 · 发表于 2009-9-15 19:30:56

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刚开始看这东西，也看了些例子。搞不大明白的就是callback和factory。看到说明里说的意思大概是callback是用来添加一些自己定义的功能的，但是例子里面总是在调callback里面的pre和post这两个函数。是不是只能在之前添加和之后添加的意思？另外factory里面提到了randomize_obj不知道是不是让数据随机的意思？总之还是不太明白。
求高人指点一二！

humann · 发表于 2009-9-15 19:59:24

your understanding are right!

wangfang221 · 发表于 2009-9-16 23:41:41

为什么是are不是is？

escorial · 发表于 2009-9-22 06:20:34

Callbacks are used to add user specified actions for selected events, for example if we have memory, we can add pre_put callback to inject error data to be written in memory and post_put callback, to see the final contents beign written to memory. Callback functions are organized in classes so we can have array of callback objects, each object with it's own behavior. For specified example, the transactor calls the pre_put function of the head ellement of callback object's array, then transactor calls pre_put of the 2nd object e.t.c.

Factory is a class specified for customizing the vmm_data objects in a way, user wants, for example, adding special constraints.