how-to-use-getOrSetCache

function getIdentityById (identityId) {
	var key = 'identity' + identityId;
	var fnSearch = function () {
		var fetchXml = '<?xml version="1.0"?>' +
			'<fetch distinct="false" mapping="logical" output-format="xml-platform" version="1.0">' +
			'<entity name="new_identity">' +
			'<attribute name="new_identityid"/>' +
			'<attribute name="new_name"/>' +
			'<attribute name="new_profile" />' +
			'<attribute name="new_membership" />' +
			'<filter type="and">' +
			'<condition attribute="new_identityid" operator="eq" value="' + identityId + '" />' +
			'</filter>' +
			'</entity>' +
			'</fetch>';
		new_XrmSvcToolkit.fetch({
			fetchXml: fetchXml,
			async: false,
			successCallback: function (retrieved) {
				cache[key] = retrieved.entities.length > 0 ? retrieved.entities[0] : null;
			},
			errorCallback: function (error) {
				throw error;
			}
		});
	};
	return function () {
	   return getOrSetCache(key, fnSearch);
	}();
}