TCache-0.9.0.2: A Transactional cache with user-defined persistence

Safe HaskellSafe-Infered

Data.TCache.Triggers

Synopsis

Documentation

data DBRef a Source

Constructors

DBRef String (TPVar a) 

Instances

Typeable1 DBRef 
Eq (DBRef a) 
Ord (DBRef a) 
(IResource a, Typeable a) => Read (DBRef a) 
Show (DBRef a) 
SetOperations [DBRef a] [DBRef a] [DBRef a] 
SetOperations [DBRef a] (JoinData a a') (JoinData a a') 
Queriable reg a => RelationOps (reg -> a) a [DBRef reg] 
(Typeable reg, IResource reg) => Select (reg -> a) (STM [DBRef reg]) (STM [a]) 
(Typeable reg, IResource reg, Typeable reg', IResource reg', Select (reg -> a) (STM [DBRef reg]) (STM [a]), Select (reg' -> b) (STM [DBRef reg']) (STM [b])) => Select (reg -> a, reg' -> b) (STM (JoinData reg reg')) (STM [([a], [b])]) 
(Typeable reg, IResource reg, Select (reg -> a) (STM [DBRef reg]) (STM [a]), Select (reg -> b) (STM [DBRef reg]) (STM [b])) => Select (reg -> a, reg -> b) (STM [DBRef reg]) (STM [(a, b)]) 
SetOperations (JoinData a a') [DBRef a'] (JoinData a a') 
SetOperations (JoinData a a') [DBRef a] (JoinData a a') 
(Queriable reg a, Queriable reg' a) => RelationOps (reg -> a) (reg' -> a) (JoinData reg reg') 
(Typeable reg, IResource reg, Select (reg -> a) (STM [DBRef reg]) (STM [a]), Select (reg -> b) (STM [DBRef reg]) (STM [b]), Select (reg -> c) (STM [DBRef reg]) (STM [c])) => Select (reg -> a, reg -> b, reg -> c) (STM [DBRef reg]) (STM [(a, b, c)]) 
(Typeable reg, IResource reg, Select (reg -> a) (STM [DBRef reg]) (STM [a]), Select (reg -> b) (STM [DBRef reg]) (STM [b]), Select (reg -> c) (STM [DBRef reg]) (STM [c]), Select (reg -> d) (STM [DBRef reg]) (STM [d])) => Select (reg -> a, reg -> b, reg -> c, reg -> d) (STM [DBRef reg]) (STM [(a, b, c, d)]) 

data Elem a Source

Constructors

Elem a AccessTime ModifTime 

Instances

data Status a Source

Constructors

NotRead 
DoNotExist 
Exist a 

Instances

addTrigger :: (IResource a, Typeable a) => (DBRef a -> Maybe a -> STM ()) -> IO ()Source

Add an user defined trigger to the list of triggers Trriggers are called just before an object of the given type is created, modified or deleted. The DBRef to the object and the new value is passed to the trigger. The called trigger function has two parameters: the DBRef being accesed (which still contains the old value), and the new value. If the content of the DBRef is being deleted, the second parameter is Nothing. if the DBRef contains Nothing, then the object is being created