Factory Production Line Exercise

Usage

Just:

python production-line.py

Will output a log of the production line activity to stdout in the form of a list of events.

Each event corresponds to the time of completion of one of more robot tasks

Each event starts with a --- line, and outputs

current event time
number of resources available to the production line (foo, bar, foobar, money and robots)
list of ongoing robot tasks with their current timeout
list of robots who completed their tasks during this event, and which new task they have been assigned to next

Sample event:

---
time = 664.2953750876165,
foo = 3, bar = 3, foobar = 3, money = 2, robots = 29
        -> buy robot (timeout 0.45079961324662854)
        -> buy robot (timeout 10.12365989839571)
        -> assemble foobar (timeout 9.988049260943589)
        -> assemble foobar (timeout 5.701984232964747)
        -> assemble foobar (timeout 3.4225624714551035)
        -> assemble foobar (timeout 10.223090968089837)
        -> assemble foobar (timeout 3.2982013540256485)
        -> buy robot (timeout 1.1888534054865563)
        -> assemble foobar (timeout 3.441316441095987)
        -> assemble foobar (timeout 7.95204148618909)
        -> assemble foobar (timeout 3.2820471140257386)
        -> assemble foobar (timeout 9.441316441095983)
        -> mining bar (timeout 1.1556967168451762)
        -> assemble foobar (timeout 3.3152091647374267)
        -> assemble foobar (timeout 4.1728258007983055)
        -> assemble foobar (timeout 3.7088993843576485)
        -> assemble foobar (timeout 3.422975996010754)
        -> assemble foobar (timeout 9.952041486189094)
        -> assemble foobar (timeout 3.9939096476893403)
        -> buy robot (timeout 1.3165147439626868)
        -> assemble foobar (timeout 3.441316441095987)
        -> assemble foobar (timeout 3.8813383944762854)
        -> assemble foobar (timeout 4.005674230980377)
        -> assemble foobar (timeout 3.738698573596052)
        -> sell 5 foobar(s) (timeout 0.47900642924703796)
        -> assemble foobar (timeout 3.9520414861890933)
        -> assemble foobar (timeout 3.3031204534837055)
        -> assemble foobar (timeout 4.223090968089837)
        -> mining bar (timeout 1.0052341122803732)
robot #0
        ending: buy robot (timeout 0.0)
        new task: mining bar (timeout 1.1250158297220478)

Eventually, the script should output finished generating 30 robots ! and exit.

Notes

The script mainly instantiates a ProductionLine, with:

min_robots=2: number of robots at beginning
max_robots=30: number of robots to reach the end

ProductionLine.tasks represents the Production Line robots, and is just a list of ongoing tasks.

When calling ProductionLine.start(), the initial robots will be created (i.e. their tasks selected and started) and ProductionLine.next_tick() will be called until the expected number of robots is reached

Within ProductionLine.next_tick(), we will:

find the next ending task (the one with the lowest timeout)
increment internal time to reach this ending, and update all tasks timeout accordingly
end tasks that were completed, and select new tasks to start

ProductionLine.select_next_task() is the method that implements the business algorithm, i.e. the method responsible for selecting the next task for a new robot, or for a robot who completed its task.

Each robot task is implemented by extending the Task class, overriding:

timeout: the task duration; can be computed/overwritten during start()
start(): start the task, typically by consuming resources from the state (i.e. production line) if required
end(): end the task, typically by adding resources to the state

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