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// Copyright 2006 The Closure Library Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS-IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/**
* @fileoverview Creates a pool of XhrIo objects to use. This allows multiple
* XhrIo objects to be grouped together and requests will use next available
* XhrIo object.
*
*/
goog.provide('goog.net.XhrIoPool');
goog.require('goog.net.XhrIo');
goog.require('goog.structs');
goog.require('goog.structs.PriorityPool');
/**
* A pool of XhrIo objects.
* @param {goog.structs.Map=} opt_headers Map of default headers to add to every
* request.
* @param {number=} opt_minCount Minimum number of objects (Default: 1).
* @param {number=} opt_maxCount Maximum number of objects (Default: 10).
* @constructor
* @extends {goog.structs.PriorityPool}
*/
goog.net.XhrIoPool = function(opt_headers, opt_minCount, opt_maxCount) {
goog.structs.PriorityPool.call(this, opt_minCount, opt_maxCount);
/**
* Map of default headers to add to every request.
* @type {goog.structs.Map|undefined}
* @private
*/
this.headers_ = opt_headers;
};
goog.inherits(goog.net.XhrIoPool, goog.structs.PriorityPool);
/**
* Creates an instance of an XhrIo object to use in the pool.
* @return {goog.net.XhrIo} The created object.
* @override
*/
goog.net.XhrIoPool.prototype.createObject = function() {
var xhrIo = new goog.net.XhrIo();
var headers = this.headers_;
if (headers) {
goog.structs.forEach(headers, function(value, key) {
xhrIo.headers.set(key, value);
});
}
return xhrIo;
};
/**
* Determine if an object has become unusable and should not be used.
* @param {Object} obj The object to test.
* @return {boolean} Whether the object can be reused, which is true if the
* object is not disposed and not active.
* @override
*/
goog.net.XhrIoPool.prototype.objectCanBeReused = function(obj) {
// An active XhrIo object should never be used.
var xhr = /** @type {goog.net.XhrIo} */ (obj);
return !xhr.isDisposed() && !xhr.isActive();
};
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