Simulation.Aivika.Activity

Tested with: GHC 7.8.3

It models an activity that can be utilised. The activity is similar to a Server but destined for simulation within Net computation.

Activity

data Activity s a b

Like Server it models an activity that takes a and provides b having state s. But unlike the former the activity is destined for simulation within Net computation.

Instances

(Show s, ResultItemable (ResultValue s)) => ResultProvider (Activity s a b)

data ActivityInterruption a

Contains data about the interrupted task.

Constructors

ActivityInterruption

Fields

activityInterruptedInput :: a

The input task that was interrupted.

activityStartProcessingTime :: Double

The start time of processing the task.

activityInterruptionTime :: Double

The time of interrupting the task.

newActivity

Arguments

:: (a -> Process b)

provide an output by the specified input

-> Simulation (Activity () a b)

Create a new activity that can provide output b by input a.

By default, it is assumed that the activity utilisation cannot be interrupted, because the handling of possible task interruption is rather costly operation.

newStateActivity

Arguments

:: (s -> a -> Process (s, b))

provide a new state and output by the specified old state and input

-> s

the initial state

-> Simulation (Activity s a b)

Create a new activity that can provide output b by input a starting from state s.

By default, it is assumed that the activity utilisation cannot be interrupted, because the handling of possible task interruption is rather costly operation.

newInterruptibleActivity

Arguments

:: Bool

whether the activity can be interrupted

-> (a -> Process b)

provide an output by the specified input

-> Simulation (Activity () a b)

Create a new interruptible activity that can provide output b by input a.

newInterruptibleStateActivity

Arguments

:: Bool

whether the activity can be interrupted

-> (s -> a -> Process (s, b))

provide a new state and output by the specified old state and input

-> s

the initial state

-> Simulation (Activity s a b)

Create a new activity that can provide output b by input a starting from state s.

Processing

activityNet :: Activity s a b -> Net a b

Return a network computation for the specified activity.

The computation updates the internal state of the activity. The usual case is when the computation is applied only once in a chain of data processing. Otherwise; every time the computation is used, the state of the activity changes. Sometimes it can be indeed useful if you want to aggregate the statistics for different activities simultaneously, but it would be more preferable to avoid this.

If you connect different activity computations returned by this function in a chain with help of >>> or other category combinator then this chain will act as one whole, where the first activity will take a new task only after the last activity finishes its current task and requests for the next one from the previous activity in the chain. This is not always that thing you might need.

Activity Properties

activityInitState :: Activity s a b -> s

The initial state of the activity.

activityState :: Activity s a b -> Event s

Return the current state of the activity.

See also activityStateChanged and activityStateChanged_.

activityTotalUtilisationTime :: Activity s a b -> Event Double

Return the counted total time when the activity was utilised.

The value returned changes discretely and it is usually delayed relative to the current simulation time.

See also activityTotalUtilisationTimeChanged and activityTotalUtilisationTimeChanged_.

activityTotalIdleTime :: Activity s a b -> Event Double

Return the counted total time when the activity was idle.

The value returned changes discretely and it is usually delayed relative to the current simulation time.

See also activityTotalIdleTimeChanged and activityTotalIdleTimeChanged_.

activityUtilisationTime :: Activity s a b -> Event (SamplingStats Double)

Return the statistics for the time when the activity was utilised.

The value returned changes discretely and it is usually delayed relative to the current simulation time.

See also activityUtilisationTimeChanged and activityUtilisationTimeChanged_.

activityIdleTime :: Activity s a b -> Event (SamplingStats Double)

Return the statistics for the time when the activity was idle.

The value returned changes discretely and it is usually delayed relative to the current simulation time.

See also activityIdleTimeChanged and activityIdleTimeChanged_.

activityUtilisationFactor :: Activity s a b -> Event Double

It returns the factor changing from 0 to 1, which estimates how often the activity was utilised.

This factor is calculated as

  totalUtilisationTime / (totalUtilisationTime + totalIdleTime)

As before in this module, the value returned changes discretely and it is usually delayed relative to the current simulation time.

See also activityUtilisationFactorChanged and activityUtilisationFactorChanged_.

activityIdleFactor :: Activity s a b -> Event Double

It returns the factor changing from 0 to 1, which estimates how often the activity was idle.

This factor is calculated as

  totalIdleTime / (totalUtilisationTime + totalIdleTime)

As before in this module, the value returned changes discretely and it is usually delayed relative to the current simulation time.

See also activityIdleFactorChanged and activityIdleFactorChanged_.

Summary

activitySummary :: Activity s a b -> Int -> Event ShowS

Return the summary for the activity with desciption of its properties using the specified indent.

Derived Signals for Properties

activityStateChanged :: Activity s a b -> Signal s

Signal when the activityState property value has changed.

activityStateChanged_ :: Activity s a b -> Signal ()

Signal when the activityState property value has changed.

activityTotalUtilisationTimeChanged :: Activity s a b -> Signal Double

Signal when the activityTotalUtilisationTime property value has changed.

activityTotalUtilisationTimeChanged_ :: Activity s a b -> Signal ()

Signal when the activityTotalUtilisationTime property value has changed.

activityTotalIdleTimeChanged :: Activity s a b -> Signal Double

Signal when the activityTotalIdleTime property value has changed.

activityTotalIdleTimeChanged_ :: Activity s a b -> Signal ()

Signal when the activityTotalIdleTime property value has changed.

activityUtilisationTimeChanged :: Activity s a b -> Signal (SamplingStats Double)

Signal when the activityUtilisationTime property value has changed.

activityUtilisationTimeChanged_ :: Activity s a b -> Signal ()

Signal when the activityUtilisationTime property value has changed.

activityIdleTimeChanged :: Activity s a b -> Signal (SamplingStats Double)

Signal when the activityIdleTime property value has changed.

activityIdleTimeChanged_ :: Activity s a b -> Signal ()

Signal when the activityIdleTime property value has changed.

activityUtilisationFactorChanged :: Activity s a b -> Signal Double

Signal when the activityUtilisationFactor property value has changed.

activityUtilisationFactorChanged_ :: Activity s a b -> Signal ()

Signal when the activityUtilisationFactor property value has changed.

activityIdleFactorChanged :: Activity s a b -> Signal Double

Signal when the activityIdleFactor property value has changed.

activityIdleFactorChanged_ :: Activity s a b -> Signal ()

Signal when the activityIdleFactor property value has changed.

Basic Signals

activityUtilising :: Activity s a b -> Signal a

Raised when starting to utilise the activity after a new input task is received.

activityUtilised :: Activity s a b -> Signal (a, b)

Raised when the activity has been utilised after the current task is processed.

activityInterrupted :: Activity s a b -> Signal (ActivityInterruption a)

Raised when the task utilisation by the activity was interrupted.

Overall Signal

activityChanged_ :: Activity s a b -> Signal ()

Signal whenever any property of the activity changes.