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Deferred: Make jQuery.when synchronous when possible

Closes gh-3102
Fixes gh-3100
Closes gh-3105
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gibson042 committed May 4, 2016
1 parent e8825a5 commit de71e9755fc0b5d45ee3fa1bac5481c2466dad6e
Showing with 47 additions and 8 deletions.
  1. +7 −2 src/deferred.js
  2. +40 −6 test/unit/deferred.js
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@@ -366,16 +366,21 @@ jQuery.extend( {
// Single- and empty arguments are adopted like Promise.resolve
if ( remaining <= 1 ) {
adoptValue( singleValue, master.resolve, master.reject );
adoptValue( singleValue, master.done( updateFunc( i ) ).resolve, master.reject );
// Use .then() to unwrap secondary thenables (cf. gh-3000)
return master.then();
if ( master.state() === "pending" ||
jQuery.isFunction( resolveValues[ i ] && resolveValues[ i ].then ) ) {
return master.then();
}
}
// Multiple arguments are aggregated like Promise.all array elements
while ( i-- ) {
adoptValue( resolveValues[ i ], updateFunc( i ), master.reject );
}
return master.promise();
}
} );
View
@@ -824,24 +824,27 @@ QUnit.test( "jQuery.when(nonThenable) - like Promise.resolve", function( assert
QUnit.test( "jQuery.when(thenable) - like Promise.resolve", function( assert ) {
"use strict";
assert.expect( 56 );
var slice = [].slice,
var CASES = 16,
slice = [].slice,
sentinel = { context: "explicit" },
eventuallyFulfilled = jQuery.Deferred().notify( true ),
eventuallyRejected = jQuery.Deferred().notify( true ),
secondaryFulfilled = jQuery.Deferred().resolve( eventuallyFulfilled ),
secondaryRejected = jQuery.Deferred().resolve( eventuallyRejected ),
inputs = {
promise: Promise.resolve( true ),
rejectedPromise: Promise.reject( false ),
deferred: jQuery.Deferred().resolve( true ),
eventuallyFulfilled: eventuallyFulfilled,
secondaryFulfilled: jQuery.Deferred().resolve( eventuallyFulfilled ),
secondaryFulfilled: secondaryFulfilled,
eventuallySecondaryFulfilled: jQuery.Deferred().notify( true ),
multiDeferred: jQuery.Deferred().resolve( "foo", "bar" ),
deferredWith: jQuery.Deferred().resolveWith( sentinel, [ true ] ),
multiDeferredWith: jQuery.Deferred().resolveWith( sentinel, [ "foo", "bar" ] ),
rejectedDeferred: jQuery.Deferred().reject( false ),
eventuallyRejected: eventuallyRejected,
secondaryRejected: jQuery.Deferred().resolve( eventuallyRejected ),
secondaryRejected: secondaryRejected,
eventuallySecondaryRejected: jQuery.Deferred().notify( true ),
multiRejectedDeferred: jQuery.Deferred().reject( "baz", "quux" ),
rejectedDeferredWith: jQuery.Deferred().rejectWith( sentinel, [ false ] ),
multiRejectedDeferredWith: jQuery.Deferred().rejectWith( sentinel, [ "baz", "quux" ] )
@@ -857,6 +860,7 @@ QUnit.test( "jQuery.when(thenable) - like Promise.resolve", function( assert ) {
deferred: [ true ],
eventuallyFulfilled: [ true ],
secondaryFulfilled: [ true ],
eventuallySecondaryFulfilled: [ true ],
multiDeferred: [ "foo", "bar" ],
deferredWith: [ true ],
multiDeferredWith: [ "foo", "bar" ]
@@ -866,6 +870,7 @@ QUnit.test( "jQuery.when(thenable) - like Promise.resolve", function( assert ) {
rejectedDeferred: [ false ],
eventuallyRejected: [ false ],
secondaryRejected: [ false ],
eventuallySecondaryRejected: [ false ],
multiRejectedDeferred: [ "baz", "quux" ],
rejectedDeferredWith: [ false ],
multiRejectedDeferredWith: [ "baz", "quux" ]
@@ -875,7 +880,9 @@ QUnit.test( "jQuery.when(thenable) - like Promise.resolve", function( assert ) {
// Strict mode functions invoked without .call/.apply get global-object context
defaultContext = (function getDefaultContext() { return this; }).call(),
done = assert.async( 28 );
done = assert.async( CASES * 2 );
assert.expect( CASES * 4 );
jQuery.each( inputs, function( message, value ) {
var code = "jQuery.when( " + message + " )",
@@ -917,6 +924,8 @@ QUnit.test( "jQuery.when(thenable) - like Promise.resolve", function( assert ) {
setTimeout( function() {
eventuallyFulfilled.resolve( true );
eventuallyRejected.reject( false );
inputs.eventuallySecondaryFulfilled.resolve( secondaryFulfilled );
inputs.eventuallySecondaryRejected.resolve( secondaryRejected );
}, 50 );
} );
@@ -1049,3 +1058,28 @@ QUnit.test( "jQuery.when - notify does not affect resolved", function( assert )
assert.ok( false, "Error on resolve" );
} );
} );
QUnit.test( "jQuery.when(...) - opportunistically synchronous", function( assert ) {
assert.expect( 5 );
var when = "before",
resolved = jQuery.Deferred().resolve( true ),
rejected = jQuery.Deferred().reject( false ),
validate = function( label ) {
return function() {
assert.equal( when, "before", label );
};
},
done = assert.async( 5 );
jQuery.when().done( validate( "jQuery.when()" ) ).always( done );
jQuery.when( when ).done( validate( "jQuery.when(nonThenable)" ) ).always( done );
jQuery.when( resolved ).done( validate( "jQuery.when(alreadyFulfilled)" ) ).always( done );
jQuery.when( rejected ).fail( validate( "jQuery.when(alreadyRejected)" ) ).always( done );
jQuery.when( resolved, rejected )
.always( validate( "jQuery.when(alreadyFulfilled, alreadyRejected)" ) )
.always( done );
when = "after";
} );

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