HTML_AJAX_Client_Pool = function(maxClients, startingClients)
{
	this.maxClients = maxClients;
	this._clients = [];
	this._len = 0;
	while (--startingClients > 0) {
		this.addClient();
	}
}

HTML_AJAX_Client_Pool.prototype = {
	isEmpty: function()
	{
		return this._len == 0;
	},
	addClient: function()
	{
		if (this.maxClients != 0 && this._len > this.maxClients) {
			return false;
		}
		var key = this._len++;
		this._clients[key] = new HTML_AJAX_HttpClient();
		return this._clients[key];
	},
	getClient: function ()
	{
		for (var i = 0; i < this._len; i++) {
			if (!this._clients[i].callInProgress() && this._clients[i].callbackComplete) {
				return this._clients[i];
			}
		}
		var client = this.addClient();
		if (client) {
			return client;
		}
		return false;
	},
	removeClient: function (client)
	{
		for (var i = 0; i < this._len; i++) {
			if (!this._clients[i] == client) {
				this._clients.splice(i, 1);
				return true;
			}
		}
		return false;
	},
	clear: function ()
	{
		this._clients = [];
		this._len = 0;
	}
};

// create a default client pool with unlimited clients
HTML_AJAX.clientPools['default'] = new HTML_AJAX_Client_Pool(0);