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Current Path : /opt/cpanel/ea-php54/root/usr/share/pear-data/HTML_AJAX/js/
Current File : //opt/cpanel/ea-php54/root/usr/share/pear-data/HTML_AJAX/js/Queue.js
/**
 * Various processing queues, use when you want to control how multiple requests are made
 * @category	HTML
 * @package	AJAX
 * @author	Joshua Eichorn <josh@bluga.net>
 * @copyright	2005 Joshua Eichorn
 * @license	http://www.opensource.org/licenses/lgpl-license.php  LGPL
 */

// Single Buffer queue with interval
// works by attempting to send a request every x miliseconds
// if an item is currently in the queue when a new item is added it will be replaced
// simple queue, just processes the request immediately
// the first request starts the interval timer
function HTML_AJAX_Queue_Interval_SingleBuffer(interval,singleOutstandingRequest) {
	this.interval = interval;
	if (singleOutstandingRequest) {
		this.singleOutstandingRequest = true;
	}
}
HTML_AJAX_Queue_Interval_SingleBuffer.prototype = {
	request: false,
	_intervalId: false,
	singleOutstandingRequest: false,
	client: false,
	addRequest: function(request) {
		this.request = request;
	},
	processRequest: function() {
		if (!this._intervalId) {
			this.runInterval();
			this.start();
		}
	}, 
	start: function() {
		var self = this;
		this._intervalId = setInterval(function() { self.runInterval() },this.interval);
	},
	stop: function() {
		clearInterval(this._intervalId);
	},
	runInterval: function() {
		if (this.request) {
			if (this.singleOutstandingRequest && this.client) {
				this.client.abort();
			}
			this.client = HTML_AJAX.httpClient();
			this.client.request = this.request;
			this.request = false;
			this.client.makeRequest();
		}
	}
}

// Requests return in the same order they were called
// this helps handle high latency situations
function HTML_AJAX_Queue_Ordered() { }
HTML_AJAX_Queue_Ordered.prototype = {
	request: false,
	order: 0,
	current: 0,
	callbacks: {},
	interned: {},
	addRequest: function(request) {
		request.order = this.order;
		this.request = request;
		this.callbacks[this.order] = this.request.callback;
		var self = this;
		this.request.callback = function(result) {
			self.processCallback(result,request.order);
		} 
	},
	processRequest: function() {
		var client = HTML_AJAX.httpClient();
		client.request = this.request;
		client.makeRequest();
		this.order++;
	},
	requestComplete: function(request,e) {
		// something when wrong with the request lets stop waiting for it
		if (e) {
			this.current++;
		}
	},
	processCallback: function(result,order) {
		if (order == this.current) {
			this.callbacks[order](result);
			this.current++;
		}
		else {
			this.interned[order] = result;
		}
		while (this.interned[this.current]) {
			this.callbacks[this.current](this.interned[this.current]);
			this.current++;
		}
}
}

// Make a single request at once, canceling and currently outstanding requests when a new one is made
function HTML_AJAX_Queue_Single() {
}
HTML_AJAX_Queue_Single.prototype = {
	request: false,
	client: false,
	addRequest: function(request) {
		this.request = request;
	},
	processRequest: function() {
		if (this.request) {
			if (this.client) {
				this.client.abort();
			}
			this.client = HTML_AJAX.httpClient();
			this.client.request = this.request;
			this.request = false;
			this.client.makeRequest();
		}
	}
}

/**
 * Priority queue
 *
 * @author	 Arpad Ray <arpad@php.net>
 */
function HTML_AJAX_Queue_Priority_Item(item, time) {
	this.item = item;
	this.time = time;
}
HTML_AJAX_Queue_Priority_Item.prototype = {
	compareTo: function (other) {
		var ret = this.item.compareTo(other.item);
		if (ret == 0) {
			ret = this.time - other.time;
		}
		return ret;
	}
}

function HTML_AJAX_Queue_Priority_Simple(interval) {
	this.interval = interval;   
	this.idleMax = 10;			// keep the interval going with an empty queue for 10 intervals
	this.requestTimeout = 5;	  // retry uncompleted requests after 5 seconds
	this.checkRetryChance = 0.1;  // check for uncompleted requests to retry on 10% of intervals
	this._intervalId = 0;
	this._requests = [];
	this._removed = [];
	this._len = 0;
	this._removedLen = 0;
	this._idle = 0;
}
HTML_AJAX_Queue_Priority_Simple.prototype = {
	isEmpty: function () {
		return this._len == 0;
	},
	addRequest: function (request) {
		request = new HTML_AJAX_Queue_Priority_Item(request, new Date().getTime());
		++this._len;
		if (this.isEmpty()) {
			this._requests[0] = request;
			return;
		}
		for (i = 0; i < this._len - 1; i++) {
			if (request.compareTo(this._requests[i]) < 0) {
				this._requests.splice(i, 1, request, this._requests[i]);
				return;
			}
		}
		this._requests.push(request);
	},
	peek: function () {
		return (this.isEmpty() ? false : this._requests[0]);
	},
	requestComplete: function (request) {
		for (i = 0; i < this._removedLen; i++) {
			if (this._removed[i].item == request) {
				this._removed.splice(i, 1);
				--this._removedLen;
				out('removed from _removed');
				return true;
			}
		}
		return false;
	},
	processRequest: function() {
		if (!this._intervalId) {
			this._runInterval();
			this._start();
		}
		this._idle = 0;
	},
	_runInterval: function() {
		if (Math.random() < this.checkRetryChance) {
			this._doRetries();
		}
		if (this.isEmpty()) {
			if (++this._idle > this.idleMax) {
				this._stop();
			}
			return;
		}
		var client = HTML_AJAX.httpClient();
		if (!client) {
			return;
		}
		var request = this.peek();
		if (!request) {
			this._requests.splice(0, 1);
			return;
		}
		client.request = request.item;
		client.makeRequest();
		this._requests.splice(0, 1);
		--this._len;
		this._removed[this._removedLen++] = new HTML_AJAX_Queue_Priority_Item(request, new Date().getTime());
	},
	_doRetries: function () {
		for (i = 0; i < this._removedLen; i++) {
			if (this._removed[i].time + this._requestTimeout < new Date().getTime()) {
				this.addRequest(request.item);
				this._removed.splice(i, 1);
				--this._removedLen;
				return true;
			}
		}
	},
	_start: function() {
		var self = this;
		this._intervalId = setInterval(function() { self._runInterval() }, this.interval);
	},
	_stop: function() {
		clearInterval(this._intervalId);
		this._intervalId = 0;
	}
};
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