Rendezvous: Difference between revisions

=={{header|Nim}}==

{{trans|Python}}

<lang nim>import asyncdispatch, options, strutils

type

Printer = ref object

inkLevel, id: int

backup: Option[Printer]

OutOfInkException = object of IOError

proc print(p: Printer, line: string){.async.} =

if p.inkLevel <= 0:

if p.backup.isNone():

raise newException(OutOfInkException, "out of ink")

else:

await p.backup.get().print(line)

else:

p.inkLevel-=1

stdout.writeLine("$1:$2".format(p.id, line))

await sleepAsync(100)

proc newPrinter(inkLevel, id: int, backup: Option[Printer]): Printer =

new(result)

result.inkLevel = inkLevel

result.id = id

result.backup = backup

proc print(p: Printer, msg: seq[string]){.async.} =

for line in msg:

try:

await p.print(line)

except OutOfInkException as e:

echo("out of ink")

break

const

humptyLines = @[

"Humpty Dumpty sat on a wall.",

"Humpty Dumpty had a great fall.",

"All the king's horses and all the king's men,",

"Couldn't put Humpty together again.",

]

gooseLines = @[

"Old Mother Goose,",

"When she wanted to wander,",

"Would ride through the air,",

"On a very fine gander.",

"Jack's mother came in,",

"And caught the goose soon,",

"And mounting its back,",

"Flew up to the moon.",

]

proc main(){.async.} =

var

reservePrinter = newPrinter(5, 2, none(Printer))

mainPrinter = newPrinter(5, 1, some(reservePrinter))

await mainPrinter.print(gooseLines) and mainPrinter.print(humptyLines)

waitFor main()</lang>

{{output}}

<pre>1:Old Mother Goose,

1:Humpty Dumpty sat on a wall.

1:When she wanted to wander,

1:Humpty Dumpty had a great fall.

1:Would ride through the air,

2:All the king's horses and all the king's men,

2:On a very fine gander.

2:Couldn't put Humpty together again.

2:Jack's mother came in,

2:And caught the goose soon,

out of ink</pre>