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( function () {
'use strict';
/**
* Call list of callbacks returning promises in serial order and returns a list of promises.
*
* @author Niklas Laxström
*
* @param {callable[]} list List of callbacks returning promises.
* @param {number} maxRetries Maximum number of times a failed promise is retried.
* @return {jQuery.Promise}
*/
function ajaxDispatcher( list, maxRetries ) {
var deferred = $.Deferred();
maxRetries = maxRetries || 0;
return $.when( helper( list, maxRetries ) )
.then( function ( promises ) {
return deferred.resolve( promises );
} ).fail( function ( errmsg ) {
return deferred.reject( errmsg );
} );
}
function helper( list, maxRetries ) {
var first, rest, retries, retrier,
deferred = $.Deferred();
if ( list.length === 0 ) {
deferred.resolve( [] );
return deferred;
}
first = list.slice( 0, 1 )[ 0 ];
rest = list.slice( 1 );
retries = 0;
retrier = function ( result, promise ) {
if ( !promise.state ) {
return;
}
if ( promise.state() === 'rejected' ) {
if ( retries < maxRetries ) {
retries += 1;
return first.call().always( retrier );
}
}
if ( promise.state() !== 'pending' ) {
helper( rest, maxRetries ).always( function ( promises ) {
deferred.resolve( [].concat( promise, promises ) );
} );
}
};
first.call().always( retrier ).catch( function ( errmsg ) {
return deferred.reject( errmsg );
} );
return deferred;
}
$.extend( $, { ajaxDispatcher: ajaxDispatcher } );
}() );
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