application.js

var posix = require('posix'), 
debug = require("./debug"), 
sys = require('sys');

var application = {};

//location to application state data
application.dataPath = '/var/www/foobar.com/server/data.json';

application.data = {};

// helper function for lazy initing objects
function jset( o,d,t ){
  if(typeof eval(o) == 'undefined'){ eval( o + ' = ' + d + ';' ); }	  
  return true;
}

process.addListener("SIGINT", function(){
  application.end();
});

application.start = function(){
  //load data.json into application state
  var x = posix.open(application.dataPath,process.O_CREAT|process.O_WRONLY|process.O_EXCL,0444).addCallback(function(fd){
	sys.puts('new datastore created');																						
  });

  var boot = posix.cat( application.dataPath ).addCallback(function (applicationState) {
    //sys.puts(JSON.stringify(applicationState));

    /* try to evaluate application state into memory */
	try {
      eval( applicationState )
	}
	catch(err){
      debug.log( 'applicationState failed to evaluate : ' + JSON.stringify(err) )  
	}
	// application options
    jset( 'application.data.totalRequests' , 0 );    
	jset( 'application.data.activeRequests' , 0 );
	jset( 'application.data.openRequests' , 0 );	

    application.data.startTime = new Date();
	application.data.currentTime = new Date();
	application.data.endTime = null; // halting problem >.<
	
  
  });
  
};

application.end = function(){
  sys.puts('application end');
  application.saveState(true);
};

application.saveState = function(shutdown){
  sys.puts('application saveState');
  //dump data.json into application state
  var mode = 0444;
  var x = posix.open(application.dataPath ,process.O_RDWR|process.O_TRUNC,0444).addCallback(function(fd){
   sys.puts('opening : ' + application.dataPath);
    /* open and write */																					
    posix.write( fd, 'application.data = ' + JSON.stringify( application.data ) + ';' ).addCallback(function(){
      sys.puts('application state serialized and stored in : ' + application.dataPath);
      if(shutdown){process.exit();}
    });
  });
 
};



exports.application=application;