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Diffstat (limited to 'lib/utils.coffee')
| -rw-r--r-- | lib/utils.coffee | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/lib/utils.coffee b/lib/utils.coffee index 4c2a7a14..51b16351 100644 --- a/lib/utils.coffee +++ b/lib/utils.coffee @@ -260,6 +260,22 @@ class SimpleCache delete @previous[key] value +# This is a simple class for the common case where we want to use some data value which may be immediately +# available, or we may have to wait. It implements the use-immediately-or-wait queue, and calls the function +# to fetch the data asynchronously. +class AsyncDataFetcher + constructor: (fetch) -> + @data = null + @queue = [] + fetch (@data) => + Utils.nextTick => + callback @data for callback in @queue + @queue = null + + use: (callback) -> + if @data? then callback @data else @queue.push callback + root = exports ? window root.Utils = Utils root.SimpleCache = SimpleCache +root.AsyncDataFetcher = AsyncDataFetcher |