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-#!/usr/bin/env kal
-
-# This demo executes GET requests in parallel and in series
-# using `for` loops and `wait for` statements.
-
-# Notice how the serial GET requests always return in order
-# and take longer in total. Parallel requests come back in
-# order of receipt.
-
-http = require 'http'
-
-urls = ['http://www.google.com'
- 'http://www.apple.com'
- 'http://www.microsoft.com'
- 'http://www.nodejs.org'
- 'http://www.yahoo.com']
-
-# This function does a GET request for each URL in series
-# It will wait for a response from each request before moving on
-# to the next request. Notice the output will be in the same order as the
-# urls variable every time regardless of response time.
-# It is a task rather than a function because it is called asynchronously
-# This allows us to use `return` to implicitly call back
-task series_demo()
- # The `series` keyword is optional here (for loops are serial by default)
- total_time = 0
-
- for series url in urls
- timer = new Date
-
- # we use the `safe` keyword because get is a "nonstandard" task
- # that does not call back with an error argument
- safe wait for response from http.get url
-
- delay = new Date() - timer
- total_time += delay
-
- print "GET #{url} - #{response.statusCode} - #{response.connection.bytesRead} bytes - #{delay} ms"
-
- # because we are in a task rather than a function, this actually exectutes a callback
- return total_time
-
-# This function does a GET request for each URL in parallel
-# It will NOT wait for a response from each request before moving on
-# to the next request. Notice the output will be determined by the order in which
-# the requests complete!
-task parallel_demo()
- total_time = 0
-
- # The `parallel` keyword is only meaningful here because the loop contains
- # a `wait for` statement (meaning callbacks are used)
- for parallel url in urls
- timer = new Date
-
- # we use the `safe` keyword because get is a "nonstandard" task
- # that does not call back with an error argument
- safe wait for response from http.get url
-
- delay = new Date() - timer
- total_time += delay
-
- print "GET #{url} - #{response.statusCode} - #{response.connection.bytesRead} bytes - #{delay}ms"
-
- # because we are in a task rather than a function, this actually exectutes a callback
- return total_time
-
-print 'Series Requests...'
-wait for time1 from series_demo()
-print "Total duration #{time1}ms"
-
-print ''
-
-print 'Parallel Requests...'
-wait for time2 from parallel_demo()
-print "Total duration #{time2}ms"