1 files changed, 67 insertions, 0 deletions
diff --git a/www/wiki/extensions/Translate/resources/js/jquery.ajaxdispatcher.js b/www/wiki/extensions/Translate/resources/js/jquery.ajaxdispatcher.js
new file mode 100644
index 00000000..68d48e74
--- /dev/null
+++ b/www/wiki/extensions/Translate/resources/js/jquery.ajaxdispatcher.js
@@ -0,0 +1,67 @@
+( 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 } );
+
+}() );