// =====================================================================//
// Author: Mark Qian <markqian@hotmail.com>                             //
// WWW: http://www.coolshare.com/                                       //
// Copyright (c) 2006, Mark Qian                                        //
//                                                                      //
// You must contact Mark Qian to get a permission of use                //
// in case you want to make any use of the codes except viewing it     //
// on Mark's site.                                                      //
//======================================================================//

var idCount = 0;

///////////////////////////////////////////////////////////////////
// 
// I simply create a concrete Communicator
// Manager, IframeCManager.
//
//////////////////////////////////////////////////////////////////

function CManager(a, max, timeout) {
  this.a = a;
  
  if (!timeout) {
    timeout = 30000;
  }
  this.commList = new Array();


  this.getCommunicator = function (enforce) {
    var st = this.getMSeconds();
    var i=0;
    while (true) {
      for (var i=0; i<this.commList.length; i++) {
       if (this.commList[i].state==0 && this.match()) {
          return this.commList[i];
       }
      }
      if (enforce) {
        //enforce to get a Commnicator outside of pool
        var comm = new DSCommunicator();
        comm.init(w, url, params, handler);
        return comm;
      } 
      var et = this.getMSeconds();
      if ((et-st)>timeout) {
        alert("Timeout when waiting for available Communicator");
        break;
      }
      //loop until find vacancy: block the current thread
    }
  }
  
  this.findCommunicator = function (id) {
    for (var i=0; i<this.commList.length; i++) {
       if (this.commList[i].id==id) { 
          return this.commList[i];
       }
    }
    return null;
  }
  
 this.getMSeconds = function() 
 { 
  var dt = new Date();
  var res = 0;
  res += dt.getMilliseconds();
  res += 1000*dt.getSeconds();
  res += 1000*60*dt.getMinutes();
  res += 1000*3600*dt.getHours();
  return 0+res/1000;
 }
 
   this.init = function(a) {
      if (!a) {
	    //Create a variety of Communicators here
	  } else {
	      //create one type of Communicator
		  for (var i=0; i<max; i++) {
		       this.commList[this.commList.length] = eval("new "+a+"Communicator()"); 
		  }
	  }
  }
  this.init(this.a);
  
  this.match = function(create) {
    //the logic to determent which type of Communicator is the 
    //best for this request. Add a new one of the best type to 
    //the commList if create is true
    //....
    return true;
  }
}