51 lines
1.5 KiB
JavaScript
51 lines
1.5 KiB
JavaScript
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dojo.provide("dojox.cometd.ack");
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dojo.require("dojox.cometd._base");
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/*
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* This file provides the dojox cometd ack extension which
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* acknowledges the messages received in /meta/connect responses.
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* Each meta/connect is sent with the id of the last successful meta/connect
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* received. The server uses this information to manage a queue of unacknowleged
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* messages.
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*
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* To use, add dojo.require("dojox.cometd.ack"); and if the handshake will be sent
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* with ext:{ack:true}. If the server supports the same extension, then the
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* mechanism will be initialized. The dojox.cometd.ackEnabled field may also be
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* used to optionally enable/disable the extension before init of cometd.
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*
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*/
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dojox.cometd._ack = new function(){
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var supportAcks = false;
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var lastAck = -1;
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this._in = function(msg){
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if (msg.channel == "/meta/handshake") {
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supportAcks = msg.ext && msg.ext.ack;
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} else if (supportAcks && msg.channel == "/meta/connect" && msg.ext && msg.ext.ack && msg.successful) {
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var ackId = parseInt(msg.ext.ack);
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lastAck = ackId;
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}
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return msg;
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}
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this._out = function(msg){
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if (msg.channel == "/meta/handshake") {
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if (!msg.ext)
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msg.ext = {};
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msg.ext.ack = dojox.cometd.ackEnabled;
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lastAck = -1;
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}
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if (supportAcks && msg.channel == "/meta/connect") {
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if (!msg.ext)
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msg.ext = {};
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msg.ext.ack = lastAck;
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}
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return msg;
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}
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};
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dojox.cometd._extendInList.push(dojo.hitch(dojox.cometd._ack, "_in"));
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dojox.cometd._extendOutList.push(dojo.hitch(dojox.cometd._ack, "_out"));
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dojox.cometd.ackEnabled = true;
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