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/*
Copyright (c) 2004-2011, The Dojo Foundation All Rights Reserved.
Available via Academic Free License >= 2.1 OR the modified BSD license.
see: http://dojotoolkit.org/license for details
*/
if(!dojo._hasResource["dojox.lang.async.topic"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
dojo._hasResource["dojox.lang.async.topic"] = true;
dojo.provide("dojox.lang.async.topic");
// Source of Deferred for topics
(function(){
var d = dojo, topic = dojox.lang.async.topic;
topic.from = function(topic){
return function(){
var h, cancel = function(){
if(h){
d.unsubscribe(h);
h = null;
}
},
x = new d.Deferred(cancel);
h = d.subscribe(topic, function(){
cancel();
x.callback(arguments);
});
return x;
};
};
topic.failOn = function(topic){
return function(){
var h, cancel = function(){
if(h){
d.unsubscribe(h);
h = null;
}
},
x = new d.Deferred(cancel);
h = d.subscribe(topic, function(evt){
cancel();
x.errback(new Error(arguments));
});
return x;
};
};
})();
}
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