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Provide a way to defer execution of functions #5691

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justinfagnani opened this Issue · 7 comments

5 participants

@justinfagnani
Collaborator

It's often a requirement to defer a function: in order to complete a Future asynchronously, or to wait for the browser to paint.

Issues 3356 and 2705 can be resolved with an ability to defer a function.

window.setInterval(0, f) (and therefore new Timer(f, 0)) isn't sufficient because it does not invoke the callback on the current or next event loop, but waits at least 4ms (html5 spec) or longer depending on the browser.

IE 10 is adding setImmediate() to handler this and it can be emulated with postMessage.

GWT allows a command to be deferred either till the end of the current event loop, or to the beginning of the next, which follows layout/paint.

This function should live in the same library as Future so that Future can automatically defer Future.complete()

@justinfagnani
Collaborator

Marked this as blocking #3356.

@lrhn
Collaborator

Added Library-Isolates label.

@DartBot
Collaborator

This comment was originally written by ross.m....@gmail.com


One thing I always liked in GWT was the Scheduler for this:

http://google-web-toolkit.googlecode.com/svn/javadoc/2.0/com/google/gwt/core/client/Scheduler.html

I'm not saying to take that Java class 'as is' - but the functionality / granularity is great.

@DartBot
Collaborator

This comment was originally written by ladicek@gmail.com


I think this is actually a duplicate of issue #3260.

@dgrove
Owner

Added Library-Isolate label.

@dgrove
Owner

Removed Library-Isolates label.

@skabet
Collaborator

We've added 'scheduleMicrotask' to dart:async to do exactly this. See http://api.dartlang.org/docs/bleeding_edge/dart_async.html#scheduleMicrotask.

Note that some implementations still use Timer.run(...) to implement this, thus still delaying the execution unnecessarily long. This is currently being worked on (there are individual bugs for that).


Added Fixed label.

This issue was closed.
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