Simulation.Aivika.Trans.Queue.Infinite

Tested with: GHC 7.10.1

This module defines an infinite queue that can use the specified strategies.

Queue Types

type FCFSQueue m a = Queue m FCFS FCFS a

A type synonym for the ordinary FIFO queue also known as the FCFS (First Come - First Serviced) queue.

type LCFSQueue m a = Queue m LCFS FCFS a

A type synonym for the ordinary LIFO queue also known as the LCFS (Last Come - First Serviced) queue.

type SIROQueue m a = Queue m SIRO FCFS a

A type synonym for the SIRO (Serviced in Random Order) queue.

type PriorityQueue m a = Queue m StaticPriorities FCFS a

A type synonym for the queue with static priorities applied when storing the elements in the queue.

data Queue m sm so a

Represents an infinite queue using the specified strategies for internal storing (in memory), sm, and dequeueing (output), so, where a denotes the type of items stored in the queue. As usual, type m denotes the underlying computation within which the simulation executes.

Instances

(MonadDES m, Show sm, Show so, ResultItemable (ResultValue sm), ResultItemable (ResultValue so)) => ResultProvider (Queue m sm so a) m

Creating Queue

newFCFSQueue :: MonadDES m => Event m (FCFSQueue m a)

Create a new infinite FCFS queue.

newLCFSQueue :: MonadDES m => Event m (LCFSQueue m a)

Create a new infinite LCFS queue.

newSIROQueue :: (MonadDES m, QueueStrategy m SIRO) => Event m (SIROQueue m a)

Create a new infinite SIRO queue.

newPriorityQueue :: (MonadDES m, QueueStrategy m StaticPriorities) => Event m (PriorityQueue m a)

Create a new infinite priority queue.

newQueue

Arguments

:: (MonadDES m, QueueStrategy m sm, QueueStrategy m so)

=> sm

the strategy applied when storing items in the queue

-> so

the strategy applied to the dequeueing (output) processes when the queue is empty

-> Event m (Queue m sm so a)

Create a new infinite queue with the specified strategies.

Queue Properties and Activities

enqueueStoringStrategy :: Queue m sm so a -> sm

The strategy applied when storing (in memory) items in the queue.

dequeueStrategy :: Queue m sm so a -> so

The strategy applied to the dequeueing (output) processes.

queueNull :: MonadDES m => Queue m sm so a -> Event m Bool

Test whether the queue is empty.

See also queueNullChanged and queueNullChanged_.

queueCount :: MonadDES m => Queue m sm so a -> Event m Int

Return the current queue size.

See also queueCountStats, queueCountChanged and queueCountChanged_.

queueCountStats :: MonadDES m => Queue m sm so a -> Event m (TimingStats Int)

Return the queue size statistics.

enqueueStoreCount :: MonadDES m => Queue m sm so a -> Event m Int

Return the total number of input items that were stored.

See also enqueueStoreCountChanged and enqueueStoreCountChanged_.

dequeueCount :: MonadDES m => Queue m sm so a -> Event m Int

Return the total number of requests for dequeueing the items, not taking into account the failed attempts to dequeue immediately without suspension.

See also dequeueCountChanged and dequeueCountChanged_.

dequeueExtractCount :: MonadDES m => Queue m sm so a -> Event m Int

Return the total number of output items that were actually dequeued.

See also dequeueExtractCountChanged and dequeueExtractCountChanged_.

enqueueStoreRate :: MonadDES m => Queue m sm so a -> Event m Double

Return the rate of the items that were stored: how many items per time.

dequeueRate :: MonadDES m => Queue m sm so a -> Event m Double

Return the rate of the requests for dequeueing the items: how many requests per time. It does not include the failed attempts to dequeue immediately without suspension.

dequeueExtractRate :: MonadDES m => Queue m sm so a -> Event m Double

Return the rate of the output items that were dequeued: how many items per time.

queueWaitTime :: MonadDES m => Queue m sm so a -> Event m (SamplingStats Double)

Return the wait time from the time at which the item was stored in the queue to the time at which it was dequeued.

See also queueWaitTimeChanged and queueWaitTimeChanged_.

dequeueWaitTime :: MonadDES m => Queue m sm so a -> Event m (SamplingStats Double)

Return the dequeue wait time from the time at which the item was requested for dequeueing to the time at which it was actually dequeued.

See also dequeueWaitTimeChanged and dequeueWaitTimeChanged_.

queueRate :: MonadDES m => Queue m sm so a -> Event m Double

Return a long-term average queue rate calculated as the average queue size divided by the average wait time.

It should conform with Little's rule.

See also queueRateChanged and queueRateChanged_.

Dequeuing and Enqueuing

dequeue

Arguments

:: (MonadDES m, DequeueStrategy m sm, EnqueueStrategy m so)

=> Queue m sm so a

the queue

-> Process m a

the dequeued value

Dequeue suspending the process if the queue is empty.

dequeueWithOutputPriority

Arguments

:: (MonadDES m, DequeueStrategy m sm, PriorityQueueStrategy m so po)

=> Queue m sm so a

the queue

-> po

the priority for output

-> Process m a

the dequeued value

Dequeue with the output priority suspending the process if the queue is empty.

tryDequeue

Arguments

:: (MonadDES m, DequeueStrategy m sm)

=> Queue m sm so a

the queue

-> Event m (Maybe a)

the dequeued value of Nothing

Try to dequeue immediately.

enqueue

Arguments

:: (MonadDES m, EnqueueStrategy m sm, DequeueStrategy m so)

=> Queue m sm so a

the queue

-> a

the item to enqueue

-> Event m ()

Enqueue the item.

enqueueWithStoringPriority

Arguments

:: (MonadDES m, PriorityQueueStrategy m sm pm, DequeueStrategy m so)

=> Queue m sm so a

the queue

-> pm

the priority for storing

-> a

the item to enqueue

-> Event m ()

Enqueue with the storing priority the item.

queueDelete

Arguments

:: (MonadDES m, Eq a, DeletingQueueStrategy m sm, DequeueStrategy m so)

=> Queue m sm so a

the queue

-> a

the item to remove from the queue

-> Event m Bool

whether the item was found and removed

Remove the item from the queue and return a flag indicating whether the item was found and actually removed.

queueDelete_

Arguments

:: (MonadDES m, Eq a, DeletingQueueStrategy m sm, DequeueStrategy m so)

=> Queue m sm so a

the queue

-> a

the item to remove from the queue

-> Event m ()

Remove the specified item from the queue.

queueDeleteBy

Arguments

:: (MonadDES m, DeletingQueueStrategy m sm, DequeueStrategy m so)

=> Queue m sm so a

the queue

-> (a -> Bool)

the predicate

-> Event m (Maybe a)

Remove an item satisfying the specified predicate and return the item if found.

queueDeleteBy_

Arguments

:: (MonadDES m, DeletingQueueStrategy m sm, DequeueStrategy m so)

=> Queue m sm so a

the queue

-> (a -> Bool)

the predicate

-> Event m ()

Remove an item satisfying the specified predicate.

queueContains

Arguments

:: (MonadDES m, Eq a, DeletingQueueStrategy m sm)

=> Queue m sm so a

the queue

-> a

the item to search the queue for

-> Event m Bool

whether the item was found

Detect whether the item is contained in the queue.

queueContainsBy

Arguments

:: (MonadDES m, DeletingQueueStrategy m sm)

=> Queue m sm so a

the queue

-> (a -> Bool)

the predicate

-> Event m (Maybe a)

the item if it was found

Detect whether an item satisfying the specified predicate is contained in the queue.

clearQueue

Arguments

:: (MonadDES m, DequeueStrategy m sm)

=> Queue m sm so a

the queue

-> Event m ()

Clear the queue immediately.

Summary

queueSummary :: (MonadDES m, Show sm, Show so) => Queue m sm so a -> Int -> Event m ShowS

Return the summary for the queue with desciption of its properties and activities using the specified indent.

Derived Signals for Properties

queueNullChanged :: MonadDES m => Queue m sm so a -> Signal m Bool

Signal when the queueNull property value has changed.

queueNullChanged_ :: MonadDES m => Queue m sm so a -> Signal m ()

Signal when the queueNull property value has changed.

queueCountChanged :: MonadDES m => Queue m sm so a -> Signal m Int

Signal when the queueCount property value has changed.

queueCountChanged_ :: MonadDES m => Queue m sm so a -> Signal m ()

Signal when the queueCount property value has changed.

enqueueStoreCountChanged :: MonadDES m => Queue m sm so a -> Signal m Int

Signal when the enqueueStoreCount property value has changed.

enqueueStoreCountChanged_ :: MonadDES m => Queue m sm so a -> Signal m ()

Signal when the enqueueStoreCount property value has changed.

dequeueCountChanged :: MonadDES m => Queue m sm so a -> Signal m Int

Signal when the dequeueCount property value has changed.

dequeueCountChanged_ :: MonadDES m => Queue m sm so a -> Signal m ()

Signal when the dequeueCount property value has changed.

dequeueExtractCountChanged :: MonadDES m => Queue m sm so a -> Signal m Int

Signal when the dequeueExtractCount property value has changed.

dequeueExtractCountChanged_ :: MonadDES m => Queue m sm so a -> Signal m ()

Signal when the dequeueExtractCount property value has changed.

queueWaitTimeChanged :: MonadDES m => Queue m sm so a -> Signal m (SamplingStats Double)

Signal when the queueWaitTime property value has changed.

queueWaitTimeChanged_ :: MonadDES m => Queue m sm so a -> Signal m ()

Signal when the queueWaitTime property value has changed.

dequeueWaitTimeChanged :: MonadDES m => Queue m sm so a -> Signal m (SamplingStats Double)

Signal when the dequeueWaitTime property value has changed.

dequeueWaitTimeChanged_ :: MonadDES m => Queue m sm so a -> Signal m ()

Signal when the dequeueWaitTime property value has changed.

queueRateChanged :: MonadDES m => Queue m sm so a -> Signal m Double

Signal when the queueRate property value has changed.

queueRateChanged_ :: MonadDES m => Queue m sm so a -> Signal m ()

Signal when the queueRate property value has changed.

Basic Signals

enqueueStored :: MonadDES m => Queue m sm so a -> Signal m a

Return a signal that notifies when the enqueued item is stored in the internal memory of the queue.

dequeueRequested :: MonadDES m => Queue m sm so a -> Signal m ()

Return a signal that notifies when the dequeuing operation was requested.

dequeueExtracted :: MonadDES m => Queue m sm so a -> Signal m a

Return a signal that notifies when the item was extracted from the internal storage of the queue and prepared for immediate receiving by the dequeuing process.

Overall Signal

queueChanged_ :: MonadDES m => Queue m sm so a -> Signal m ()

Signal whenever any property of the queue changes.

The property must have the corresponded signal. There are also characteristics similar to the properties but that have no signals. As a rule, such characteristics already depend on the simulation time and therefore they may change at any time point.