TCache: A Transactional data cache with configurable persistence
Data.Tcache is a transactional cache with configurable persistence. It tries to simulate Hibernate for Java or Rails for Ruby. The main difference is that transactions are done in memory trough STM. There are transactional cache implementations for some J2EE servers like JBOSS.
TCache uses STM. It can atomically apply a function to a list of cached objects. The resulting objects go back to the cache (withResources). It also can retrieve these objects (getResources). Persistence can be syncronous (syncCache) or asyncronous, wtih configurable time between cache writes and configurable cache clearance strategy. the size of the cache can be configured too . All of this can be done trough clearSyncCacheProc. Even the TVar variables can be accessed directly (getTVar) to acceess all the semantic of atomic blocks while maintaining the persistence of the TVar updates.
Persistence can be defined for each object: Each object must have a defined key, a default filename path (if applicable). Persistence is pre-defined in files, but the readResource writeResource and delResource methods can be redefined to persist in databases or whatever.
Serialization is also configurable.
There are Samples here that explain the main features.
In this release
added withSTMResources. Most of the rest of the methods are derived from withSTMResources . the results are returned in the STM monad, so this method can be part of al larger STM transaction It also can perforn used defined retries.
added modules for cached TMVars Data.TCache.TMVar and Data.TCache.TMVar.Dynamic uses TMVars instead of TVars (See Control.Concurrent.STM.TMVar)
It is not possible tu mix TVars and TMVars packages in the same executable. However code that uses dynamic and non dynamic can can be mixed
Data.TCache - cached TVars of object of type a.
Data.TCache.Dynamic - cached TVars of objects of type IDynamic.
Data.TCache.TMVar - cached TMVars of objects of type a.
Data.TCache..TMVar.Dynamic - cached TMVars of objects of type IDynamic.
|Versions [faq]||0.5, 0.5.1, 0.5.2, 0.5.3, 0.5.4, 0.5.5, 0.6.4, 0.6.5, 0.8.0, 0.8.0.1, 0.8.0.2, 0.9, 0.9.0.1, 0.9.0.2, 0.9.0.3, 0.9.0.4, 0.10.0.0, 0.10.0.1, 0.10.0.2, 0.10.0.3, 0.10.0.4, 0.10.0.5, 0.10.0.6, 0.10.0.8, 0.10.0.9, 0.10.0.10, 0.10.0.11, 0.10.0.12, 0.10.1.0, 0.10.2.0, 0.10.2.1, 0.10.2.2, 0.10.2.3, 0.10.2.4, 0.11.0.0, 0.12.0, 0.12.1|
|Dependencies||base (==3.*), containers (>=0.1.0.1), directory (>=1.0), old-time (>=1.0), RefSerialize (>=0.2.4), stm (>=2) [details]|
|Author||Alberto Gómez Corona|
|Category||Middleware, Data, Database, Concurrency|
|Uploaded||by AlbertoCorona at Thu Oct 1 19:19:50 UTC 2009|
|Distributions||LTSHaskell:0.12.1, NixOS:0.12.1, Stackage:0.12.1|
|Downloads||20895 total (678 in the last 30 days)|
|Rating||(no votes yet) [estimated by rule of succession]|
Docs uploaded by user
Build status unknown [no reports yet]
For package maintainers and hackage trustees