Openresty Lua resty mlcache multi-level cache

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openresty lua-resty-mlcache Multi level cache

         

Official website ：https://github.com/thibaultcha/lua-resty-mlcache

        

              

                                  

Multi level cache

          

                

  First level cache ： Use lrucache Store the most commonly used data , Every worker Use a single memory

Second level cache ： Use lua_shared_dict Store shared data , When the L1 cache misses , Read data from L2 cache

Three level cache ： One 、 L2 cache miss , Just read data from the back end （ Use lock Lock , Avoid a large number of requests accessing at the same time ）, And store the data in the L2 cache , And others worker share

         

             

                                  

Create cache instance

          

new： Create cache instance

 Grammar format ：cache, err = mlcache.new(name, shm, opts?)
*  Create cache instance , If the creation fails , return nil、 error message 

* name： The name of the cache instance , If different cache instances name identical , Then data sharing 
* shm：lua_shared_dict Shared cache name , If different mlcache Of shm identical , Then data sharing 

* opts： Optional parameters 
 * lru_size： L1 cache size , Default 100
 * ttl： Cache expiration time , The unit is in seconds , Set to 0 Never expire , Default 30
 * neg_ttl： When the L3 cache returns nil when , Cache expiration time , The unit is in seconds , Set to 0 Never expire , Default 5
 * resurrect_ttl： When 3 Level cache return nil, Extend expiration cache time , The unit is in seconds