橋本商会

参考

• Events Node.js v0.8.3 Manual & Documentation
• util Node.js v0.8.3 Manual & Documentation
• Cleaning Up Deep Callback Nesting With Node's EventEmitter

普通に使う

var events = require('events');



var foo = new events.EventEmitter();



foo.on('bar', function(data){

  console.log(data.message + ' - ' + data.date);

});



foo.emit('bar', {message : 'hello', date : new Date()});

foo.emit('bar', {message : 'helloooooo', date : new Date()});

hello - Tue Jul 24 2012 18:01:48 GMT+0900 (JST)

helloooooo - Tue Jul 24 2012 18:01:48 GMT+0900 (JST)

クラスに組み込む

クラスにevents.EventEmitter.callとutil.inheritsすると、インスタンスにon/emitが追加される

var events = require('events');

var util = require('util');



var User = function(name){

  events.EventEmitter.call(this);

  this.name = name;

}

util.inherits(User, events.EventEmitter);



var shokai = new User('shokai');

var ahokai = new User('ahokai');



var callback = function(data){

  console.log(this.name+' => '+data);

};



shokai.on('hungry', callback);

ahokai.on('hungry', callback);



shokai.emit('hungry', 'kazusuke');

ahokai.emit('hungry', 'zanmai');

shokai => kazusuke

ahokai => zanmai