/*    Copyright 2006 Christian Gross http://www.devspace.com    From the book Ajax Patterns and Best Practices   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.*/function CounterHack() {    this.counter = 0;}function ClientCommunicator() {    //this.server2Client = new Asynchronous();    this.baseURL = null;    this._delegated = null;    this.username = null;    this.password = null;    this.listen = null;    this.doLoop = false;    this.callDelay = 500;    this.preferredTypes = "text/xml";    this.index = this.instanceCount.counter;    this.instances[ this.index] = this;    this.instanceCount.counter ++;    this.versionTracker = 0;    this.doLoop = false;    this.waitingForAnswer = false;}function PrivateLoop( index) {    var thisRef = ClientCommunicator.prototype.instances[ index];    var thisIndex = index;        var server2Client = new Asynchronous();    server2Client.openCallback = function( xmlhttp) {        xmlhttp.setRequestHeader( "Accept", thisRef.preferredTypes);        xmlhttp.setRequestHeader( "X-Last-State", thisRef.versionTracker);    }    server2Client.complete = function( status, statusText, responseText, responseXML) {        if( status == 200) {            try {                thisRef.versionTracker = server2Client._xmlhttp.getResponseHeader( "X-Last-State");            }            catch( e) {                 //             }        }        if( thisRef.listen != null) {            thisRef.listen( status, statusText, responseText, responseXML);        }        thisRef.waitingForAnswer = false;    }    server2Client.username = thisRef.username;    server2Client.password = thisRef.password;    try {        server2Client.get( thisRef.baseURL);        thisRef.waitingForAnswer = true;    }    catch( e) {        debugger;    }}function RepeatingLoop() {    var timeout = ClientCommunicator.prototype.waitTime;    var didAtLeastOne = false;    for( var c1 = 0; c1 < ClientCommunicator.prototype.instanceCount.counter; c1 ++) {        if( ClientCommunicator.prototype.instances[ c1].waitingForAnswer == false) {            PrivateLoop( c1);            didAtLeastOne = true;        }    }    if( didAtLeastOne == true) {        timeout = 500;    }    window.setTimeout( "RepeatingLoop()", timeout);}// Start the repeating loop right awaywindow.setTimeout( "RepeatingLoop()", ClientCommunicator.prototype.waitTime);function ClientCommunicator_start() {    if( this.baseURL != null) {        this.doLoop = true;                /*if( this.doLoop != true) {            this.doLoop = true;            window.setTimeout( "PrivateLoop(" + this.index + ")", this.callDelay);        }*/    }    else {        throw new Error( "Must specify baseURL before starting communications");    }}function ClientCommunicator_send( mimetype, contentLength, content) {    var client2Server = new Asynchronous    client2Server.username = this.username;    client2Server.password = this.password;    var thisReference = this;    client2Server.complete = function( status, statusText, responseText, responseXML) {        if( status == 201) {            try {                thisReference.baseURL = this._xmlhttp.getResponseHeader( "Location");            }            catch( e) {            }        }        else if( status != 200) {            throw new Error( "Post resulted in error (" + status + ") error text (" + statusText + ")");        }    }    client2Server.post( this.baseURL, mimetype, contentLength, content);}function ClientCommunicator_doRedirection() {    var client2Server = new Asynchronous    client2Server.username = this.username;    client2Server.password = this.password;    var thisReference = this;    client2Server.complete = function( status, statusText, responseText, responseXML) {        if( status == 201) {            try {                thisReference.baseURL = this._xmlhttp.getResponseHeader( "Location");            }            catch( e) {            }        }        else if( status != 200) {            throw new Error( "Post resulted in error (" + status + ") error text (" + statusText + ")");        }    }    client2Server.get( this.baseURL);}function ClientCommunicator_end() {    this.doLoop = false;}ClientCommunicator.prototype.start = ClientCommunicator_start;ClientCommunicator.prototype.end = ClientCommunicator_end;ClientCommunicator.prototype.send = ClientCommunicator_send;ClientCommunicator.prototype.doRedirection = ClientCommunicator_doRedirection;ClientCommunicator.prototype.instances = new Array();ClientCommunicator.prototype.instanceCount = new CounterHack();ClientCommunicator.prototype.waitTime = 1000;