, CommonExprSet
, Constant(..)
+ , Variable(..)
, CommonUnaryOp(..)
, CommonBinaryOp(..)
, CommonTrinaryOp(..)
, CommonSetOp(..)
+ , TrendOp(..)
+ , VariableShiftPredictOp(..)
+ , FixedShiftPredictOp(..)
+ , CommonValue(..)
, IterativeValue(..)
+ , IterativeValueOf(..)
, AggregativeUnaryOp(..)
, createRRD
dsName = "foo"
-- , dsExpr = Previous :<: Const 100
-- , dsExpr = Var "foo" :<: Const 100
- , dsExpr = Average (Const 100 .*. Const 200 .*. HNil)
+ , dsExpr = AverageOf (Const 100 .*. Const 200 .*. HNil)
}
-class Show e => Expr e
+class (Show e, Eq e) => Expr e
class Expr e => CommonExpr e
class Expr e => IterativeExpr e
class Expr e => AggregativeExpr e
instance CommonExpr e => IterativeExpr e
-instance CommonExpr e => AggregativeExpr e
-class (Show es, HList es) => ExprSet es
+--class MentionedVars
+
+class (Show es, Eq es, HList es) => ExprSet es
instance ExprSet HNil
instance (Expr e, ExprSet es) => ExprSet (HCons e es)
-class (Show es, HList es) => CommonExprSet es
+class (Show es, Eq es, HList es) => CommonExprSet es
instance CommonExprSet es => ExprSet es
instance CommonExprSet HNil
instance (CommonExpr e, CommonExprSet es) => CommonExprSet (HCons e es)
-- Constants and variable names
data Constant
= Const !Double
- | Var !String
deriving (Show, Eq, Ord)
instance Expr Constant
instance CommonExpr Constant
+class (Show a, Eq a) => Variable a where
+ varName :: a -> String
+
+instance Variable a => Expr a
+instance Variable a => CommonExpr a
+
-- Common operators
data CommonUnaryOp a
= IsUnknown !a
-- multiple values onto the stack...
data CommonSetOp es
- = Average !es
+ = AverageOf !es
deriving (Show, Eq, Ord)
instance ExprSet es => Expr (CommonSetOp es)
instance CommonExprSet es => CommonExpr (CommonSetOp es)
+data TrendOp v a
+ = Trend !v !a
+ | TrendNan !v !a
+ deriving (Show, Eq, Ord)
+instance (Variable v, Expr a) => Expr (TrendOp v a)
+instance (Variable v, CommonExpr a) => CommonExpr (TrendOp v a)
+
+data VariableShiftPredictOp ss w v
+ = VariableShiftPredictAverage !ss !w !v
+ | VariableShiftPredictSigma !ss !w !v
+ deriving (Show, Eq, Ord)
+instance (ExprSet ss, Expr w, Variable v)
+ => Expr (VariableShiftPredictOp ss w v)
+instance (CommonExprSet ss, CommonExpr w, Variable v)
+ => CommonExpr (VariableShiftPredictOp ss w v)
+
+data FixedShiftPredictOp sm w v
+ = FixedShiftPredictAverage !sm !w !v
+ | FixedShiftPredictSigma !sm !w !v
+ deriving (Show, Eq, Ord)
+instance (Expr sm, Expr w, Variable v)
+ => Expr (FixedShiftPredictOp sm w v)
+instance (CommonExpr sm, CommonExpr w, Variable v)
+ => CommonExpr (FixedShiftPredictOp sm w v)
+
+-- Common special values
+data CommonValue
+ = Unknown
+ | Infinity
+ | NegativeInfinity
+ | Now
+ deriving (Show, Eq, Ord)
+instance Expr CommonValue
+instance CommonExpr CommonValue
+
-- Iterative special values
data IterativeValue
= Previous
+ | Count
+ | TakenTime
+ | TakenLocalTime
deriving (Show, Eq, Ord)
instance Expr IterativeValue
instance IterativeExpr IterativeValue
--- Aggregative operators
-data AggregativeUnaryOp a
- = Maximum !a
+data IterativeValueOf v
+ = PreviousOf !v
+ deriving (Show, Eq, Ord)
+instance Variable v => Expr (IterativeValueOf v)
+instance Variable v => IterativeExpr (IterativeValueOf v)
+
+-- Aggregative operators (fairly restricted due to rrdtool's
+-- restriction)
+data AggregativeUnaryOp v
+ = Maximum !v
+ | Minimum !v
+ | Average !v
+ | StandardDeviation !v
+ | First !v
+ | Last !v
+ | Total !v
+ | Percent !v !Constant
+ | PercentNan !v !Constant
+ | LSLSlope !v
+ | LSLInt !v
+ | LSLCorrel !v
deriving (Show, Eq, Ord)
-instance Expr a => Expr (AggregativeUnaryOp a)
-instance AggregativeExpr a => AggregativeExpr (AggregativeUnaryOp a)
+instance Variable v => Expr (AggregativeUnaryOp v)
+instance Variable v => AggregativeExpr (AggregativeUnaryOp v)
-- |The 'createRRD' function lets you set up new Round Robin Database
-- (RRD) files. The file is created at its final, full size and filled