ATS大文件写:

大文件写:
HttpSM::set_next_state
HttpSM::do_cache_prepare_write
HttpSM::do_cache_prepare_action
HttpCacheSM::open_write
1.  CacheProcessor::open_write  --> 2
2.  Cache::open_write  --> 3 //new_CacheVC
3.  CacheVC::callcont  --> 4
4.  CacheVC::openWriteMain  --> 5,6
5.  CacheVC::calluser  --> 4
6.  CacheVC::handleWrite  --> 7(write every fragment except the last one),8(write the last fragment done ),11(write head to cache done)
    CacheVC::handleWriteLock
7.  CacheVC::openWriteWriteDone  --> 4
8.  CacheVC::openWriteCloseDataDone  --> 9(dir_insert,write last fragment of the body done)
9.  CacheVC::openWriteCloseHead  --> 10
10. CacheVC::updateVector  --> 6
11. CacheVC::openWriteCloseHeadDone --> 12(dir_insert,use first_key for head)
12. CacheVC::openWriteCloseDir  --> 13
13. free_CacheVC

对于大文件的读写,程序逻辑相对要复杂一些。结合小文件写以及第一章最后对大文件的存储策略的描述,大文件写有以下几点不同:
(1) 大文件是先写body的fragment,写完所有fragment后,再写head。head使用object生成的first_key作为它的key值找到对应的索引保存相关元信息,而对于fragment,第一个fragment使用随机数算法生成一个数作为它的key值,从第二个开始,每个fragment都是以前一个fragment的key值作为种子,通过随机数算法生成一个key值。
(2) 如果一个body被分成了几个fragment,则写第一个至倒数第二个fragment结束后程序逻辑走到openWriteWriteDone,而写最后一个fragment结束后程序逻辑走到openWriteCloseDataDone,代表写body完成。

4.4M文件的写流程:
HttpSM::do_cache_prepare_write
HttpSM::do_cache_prepare_action
HttpCacheSM::open_write
CacheProcessor::open_write
Cache::open_write
new_CacheVC
rand_CacheKey
CacheVC::callcont
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::handleWriteLock
CacheVC::handleWrite
Vol::aggWrite
CacheVC::openWriteWriteDone
next_CacheKey
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::handleWriteLock
CacheVC::handleWrite
Vol::aggWrite
CacheVC::openWriteWriteDone
next_CacheKey
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::handleWriteLock
CacheVC::handleWrite
Vol::aggWrite
CacheVC::openWriteWriteDone
next_CacheKey
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::handleWriteLock
CacheVC::handleWrite
Vol::aggWrite
CacheVC::openWriteWriteDone
next_CacheKey
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteMain
CacheVC::calluser
CacheVC::openWriteClose
CacheVC::handleWriteLock
CacheVC::handleWrite
Vol::aggWrite
CacheVC::openWriteCloseDataDone
next_CacheKey
CacheVC::openWriteCloseHead
CacheVC::updateVector
CacheVC::handleWrite
Vol::aggWrite
CacheVC::openWriteCloseHeadDone
CacheVC::openWriteCloseDir
free_CacheVC

 

ATS大文件写:_第1张图片

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