b01c028673
As per OpenStack licensing guide lines [1]: [H102 H103] Newly contributed Source Code should be licensed under the Apache 2.0 license. [1] http://docs.openstack.org/developer/hacking/#openstack-licensing Change-Id: If9ae2195d23ee8ed4bfe3da136e647f4e291a415
67 lines
2.2 KiB
JavaScript
67 lines
2.2 KiB
JavaScript
/**
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License. You may obtain
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* a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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/* Queued ajax handling for Horizon.
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*
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* Note: The number of concurrent AJAX connections hanlded in the queue
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* can be configured by setting an "ajax_queue_limit" key in
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* HORIZON_CONFIG to the desired number (or None to disable queue
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* limiting).
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*/
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horizon.ajax = {
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// This will be our jQuery queue container.
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_queue: [],
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_active: [],
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get_messages: function (request) {
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return request.getResponseHeader("X-Horizon-Messages");
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},
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// Function to add a new call to the queue.
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queue: function(opts) {
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var def = $.Deferred();
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horizon.ajax._queue.push({opts: opts, deferred: def});
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// Start up the queue handler in case it's stopped.
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horizon.ajax.next();
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return def.promise();
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},
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next: function () {
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var queue = horizon.ajax._queue;
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var limit = horizon.conf.ajax.queue_limit;
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function process_queue(request) {
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return function() {
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// TODO(sambetts) Add some processing for error cases
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// such as unauthorised etc.
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var active = horizon.ajax._active;
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var index = $.inArray(request, active);
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if (index > -1) {
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active.splice(index, 1);
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}
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horizon.ajax.next();
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};
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}
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if (queue.length && (!limit || horizon.ajax._active.length < limit)) {
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var item = queue.shift();
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var request = $.ajax(item.opts);
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horizon.ajax._active.push(request);
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// Add an always callback that processes the next part of the queue,
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// as well as success and fail callbacks that resolved/rejects
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// the deferred.
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request.always(process_queue(request));
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request.then(item.deferred.resolve, item.deferred.reject);
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}
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}
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};
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