de.uka.ipd.sdq.scheduler.strategy
Interface IScheduler

All Known Implementing Classes:

AbstractScheduler, PreemptiveScheduler

public interface IScheduler

Scheduling strategy for an active resource. Called by each of its instances to schedule the next processes.

Author:

jens

Method Summary

void	forkNewProcess(IActiveProcess process, IResourceInstance current) Registers a new process and adds it to the scheduler's runqueue(s).
void	fromRunningToWaiting(WaitingProcess waiting_process, Deque<WaitingProcess> waiting_queue, boolean in_front) Notifies the scheduler, that a running process has to change its state to waiting.
void	fromWaitingToReady(WaitingProcess waiting_process, Deque<WaitingProcess> waiting_queue, IResourceInstance current) Notifies the scheduler, that a process finished its waiting period and becomes ready for execution.
double	getInterval()
boolean	isIdle(IResourceInstance instance) True, if the given resource has no running or pending jobs, otherwise false.
void	registerProcess(IActiveProcess p, IResourceInstance instance)
void	schedule(IResourceInstance instance) Executes the next processes on the given resource instances.
void	scheduleNextEvent(IResourceInstance instance) Schedules the next event for the specified resource instance.
void	terminateProcess(IActiveProcess lookUp, IResourceInstance current)

Method Detail

schedule

void schedule(IResourceInstance instance)

Executes the next processes on the given resource instances.

Parameters:

instance - Resource instance requesting scheduling.

forkNewProcess

void forkNewProcess(IActiveProcess process,
                    IResourceInstance current)

Registers a new process and adds it to the scheduler's runqueue(s).

Parameters:

process -

fromWaitingToReady

void fromWaitingToReady(WaitingProcess waiting_process,
                        Deque<WaitingProcess> waiting_queue,
                        IResourceInstance current)

Notifies the scheduler, that a process finished its waiting period and becomes ready for execution. It takes care of the complete state change including the removal of the process from its waiting queue.

Parameters:

waiting_process - Wrapper for the waiting process.

waiting_queue - Queue where the process is waiting.

fromRunningToWaiting

void fromRunningToWaiting(WaitingProcess waiting_process,
                          Deque<WaitingProcess> waiting_queue,
                          boolean in_front)

Notifies the scheduler, that a running process has to change its state to waiting. Takes care of the complete state change, including the insertion of the process into the waiting queue.

Parameters:

waiting_process - Wrapper for the waiting process. Includes additional information about the waiting state.

waiting_queue - The queue where the process has to wait.

in_front - If true, the process is inserted at the front of the queue, otherwise it is inserted at the end.

scheduleNextEvent

void scheduleNextEvent(IResourceInstance instance)

Schedules the next event for the specified resource instance. Assumes that the running process of the instance is set correctly.

Parameters:

instance - Instance a new event is needed for.

isIdle

boolean isIdle(IResourceInstance instance)

True, if the given resource has no running or pending jobs, otherwise false.

Parameters:

instance -

Returns:

getInterval

double getInterval()

terminateProcess

void terminateProcess(IActiveProcess lookUp,
                      IResourceInstance current)

registerProcess

void registerProcess(IActiveProcess p,
                     IResourceInstance instance)