--- 
extends:
  http://vwf.example.com/node2.vwf
properties:
  logger_logs:
    set: |
      //this.logger_logs = ( this.logger_logs === undefined ) ? value : this.logger_logs;
      this.logger_logs = value;
    value: []
  logger_maxLogs: 10
  logger_lifeTime:
    set: |
      if ( this.logger_lifeTime !== value ) {
        if ( value !== -1 ) {
          this.future( 0 ).updateLogs();
        }
        this.logger_lifeTime = value;
      }
    value: -1
  logger_frequency: 1  
  logger_logFormat: undefined
events:
  logRemoved:
  logAdded:
methods:
  addLog:
  removeLog:
  updateLogs:
scripts:
- |
    this.initialize = function() {
      if ( this.logger_lifeTime !== -1 ) {
        this.future( 0 ).updateLogs();
      }
    }

    this.addLog = function( msg ){
      var logCopy = this.logger_logs.slice( 0 );
      while ( logCopy.length >= this.logger_maxLogs ) {
        logCopy.shift();
        this.logRemoved( 0 );
      }
      var newMsg = { "log": msg, "time": this.time };
      if ( this.logger_logFormat ) {
        var index = this.logger_logFormat.indexOf( '%s' );
        if ( index !== -1 ) {
          var str = this.logger_logFormat;
          newMsg.log = str.substr( 0, index ) + newMsg.log + str.substr( index + 2 );
        }
      }
      logCopy.push( newMsg );
      this.logger_logs = logCopy;
      this.logAdded( newMsg );
    }

    this.updateLogs = function() {

      if ( this.logger_lifeTime !== -1 ) {
        var logCopy = this.logger_logs.slice(0);
        var timeOk = false;
        var log;
        var logsToDelete = 0;
        for ( var i = 0; i < logCopy.length && !timeOk; i++ ) {
          log = logCopy[ i ];
          if ( this.time - log.time >= this.logger_lifeTime ) {
            logsToDelete++;
          } else {
            timeOk = true;
          }
        }
        if ( logsToDelete > 0 ) {
          for ( var i = 0; i <= logsToDelete; i++ ) {
            logCopy.shift();
            this.logRemoved( 0 );            
          }
          this.logger_logs = logCopy;
        }
        this.future( this.logger_frequency ).updateLogs();
      }

    }
    //@ sourceURL=logger.vwf