Lookahead
A Lookahead contains information about the order in which tasks run.
The structure is immutable. It is built by the simulation and passed to the scheduler where it is used for scheduling by revealing information about future tasks so that look-ahead can be achieved.
Value members
Abstract methods
Adds an entry to the structure
Adds an entry to the structure
An entry is comprised of a function that describes the prerequisites and resultant starting
time of a set of tasks, and a list of Tasks that should start if this function returns
Some(value).
The function has type Map[UUID,Long]=>Option[Long]. It should take a map that contains the
IDs of completed/scheduled tasks and their respective finishing times, and it should return
None if the prerequisites of this entry are not met, and Some(value) if the prerequisites
are met, where value should be the starting time of the tasks contained in this entry. This
allows us to express a complex relationship whereby the starting time of the tasks in this
lookahead entry can be an intricate function of the finishing times of the prerequisites.
- Value Params
- function
The function that describes the prerequisites of this entry. Should return
Noneif the prerequisites are not met, orSome(value)if the prerequistes are met, where the value is the starting time of the tasks in this entry.- generators
A list of Tasks that describes the tasks that should start if the prerequistes are met.
- Returns
A Lookahead with the specified entry added to it.
Removes a task with the corresponding ID from the structure
Removes a task with the corresponding ID from the structure
Once removed, the task with this ID will no longer be returned.
- Value Params
- id
The id of the task
- Returns
A Lookahead with the specified task removed.
Retrieves all tasks that can start given the list of scheduled/completed tasks
Retrieves all tasks that can start given the list of scheduled/completed tasks
- Value Params
- scheduled
The list of tasks that have been scheduled/completed, described with an (ID,time) tuple
- Returns
The list of tasks that can start, described by (Task,starting_time) tuples
Concrete methods
Provides a nicer interface for adding elements to the lookeahead structure.
Provides a nicer interface for adding elements to the lookeahead structure.
Allows adding a single generator instead of a list of generators.
- Value Params
- function
The function describing the conditions of starting the correspoinding task.
- generator
The task that will start when the conditions are met.
- See also
Provides a nicer interface for adding elements to the lookeahead structure.
Provides a nicer interface for adding elements to the lookeahead structure.
Allows adding a simple one-to-one relationship, where the generator task starts right after the sourceID task finishes.
- Value Params
- generator
The generator fo the task that will start when the prior task finishes.
- sourceID
The id of the task that will finish.
- See also