its a server side Javascript (rhino engine), so setTimeout is not available. how to run a function asynchronously?
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3 Answers
You can use java.util.Timer and java.util.TimerTask to roll your own set/clear Timeout and set/clear Interval functions:
var setTimeout, clearTimeout, setInterval, clearInterval; (function () { var timer = new java.util.Timer(); var counter = 1; var ids = {}; setTimeout = function (fn,delay) { var id = counter++; ids[id] = new JavaAdapter(java.util.TimerTask,{run: fn}); timer.schedule(ids[id],delay); return id; } clearTimeout = function (id) { ids[id].cancel(); timer.purge(); delete ids[id]; } setInterval = function (fn,delay) { var id = counter++; ids[id] = new JavaAdapter(java.util.TimerTask,{run: fn}); timer.schedule(ids[id],delay,delay); return id; } clearInterval = clearTimeout; })() 
6 Comments
Gian Marco
Whit your code snippet, i was able to run Jasmine tests inside Rhino without the need of EnvJS. Thanks!
Upgradingdave
I wish I could give you 100 upvotes, very awesome. Thanks so much.
Brandon Bloom
Awesome. Thanks! To be fully compatibile with browsers, you need to handle omission of delay as well. MDN says that the minium delay as per the HTML5 spec is 4ms, so add the following: if (delay == null) { delay = 4; }
Stephan
NOTA: Rhino 1.7R4 has a bug that prevents the code in this answer to run. Either downgrade to 1.7R3 or use a newer version. (Check this discussion for details on newer versions: groups.google.com/d/msg/mozilla-rhino/6vvcjg_7NNU/XnWEPEyfcfwJ)
Mikita Belahlazau
@Alex, I created version that uses
ScheduledThreadPoolExecutor instead of Timer and works in 1.7R4: gist.github.com/nbeloglazov/9633318 |
Have a look at the Multithreaded Script Execution example on the Rhino Examples page. Basically, JavaScript does not support threading directly, but you may be able to use a Java thread to achieve what you are looking for.
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Another version using ScheduledThreadPoolExecutor, compatible with Rhino 1.7R4 and proposed by @Nikita-Beloglazov:
var setTimeout, clearTimeout, setInterval, clearInterval; (function () { var executor = new java.util.concurrent.Executors.newScheduledThreadPool(1); var counter = 1; var ids = {}; setTimeout = function (fn,delay) { var id = counter++; var runnable = new JavaAdapter(java.lang.Runnable, {run: fn}); ids[id] = executor.schedule(runnable, delay, java.util.concurrent.TimeUnit.MILLISECONDS); return id; } clearTimeout = function (id) { ids[id].cancel(false); executor.purge(); delete ids[id]; } setInterval = function (fn,delay) { var id = counter++; var runnable = new JavaAdapter(java.lang.Runnable, {run: fn}); ids[id] = executor.scheduleAtFixedRate(runnable, delay, delay, java.util.concurrent.TimeUnit.MILLISECONDS); return id; } clearInterval = clearTimeout; })() Reference: https://gist.github.com/nbeloglazov/9633318
