// that to be increased. Set to zero for unlimited.
EventEmitter.prototype.setMaxListeners = function setMaxListeners(n) {
if (typeof n !== 'number' || n < 0 || isNaN(n))
- throw TypeError('n must be a positive number');
+ throw new TypeError('n must be a positive number');
this._maxListeners = n;
return this;
};
return $getMaxListeners(this);
};
+// These standalone emit* functions are used to optimize calling of event
+// handlers for fast cases because emit() itself often has a variable number of
+// arguments and can be deoptimized because of that. These functions always have
+// the same number of arguments and thus do not get deoptimized, so the code
+// inside them can execute faster.
+function emitNone(handler, isFn, self) {
+ if (isFn)
+ handler.call(self);
+ else {
+ var len = handler.length;
+ var listeners = arrayClone(handler, len);
+ for (var i = 0; i < len; ++i)
+ listeners[i].call(self);
+ }
+}
+function emitOne(handler, isFn, self, arg1) {
+ if (isFn)
+ handler.call(self, arg1);
+ else {
+ var len = handler.length;
+ var listeners = arrayClone(handler, len);
+ for (var i = 0; i < len; ++i)
+ listeners[i].call(self, arg1);
+ }
+}
+function emitTwo(handler, isFn, self, arg1, arg2) {
+ if (isFn)
+ handler.call(self, arg1, arg2);
+ else {
+ var len = handler.length;
+ var listeners = arrayClone(handler, len);
+ for (var i = 0; i < len; ++i)
+ listeners[i].call(self, arg1, arg2);
+ }
+}
+function emitThree(handler, isFn, self, arg1, arg2, arg3) {
+ if (isFn)
+ handler.call(self, arg1, arg2, arg3);
+ else {
+ var len = handler.length;
+ var listeners = arrayClone(handler, len);
+ for (var i = 0; i < len; ++i)
+ listeners[i].call(self, arg1, arg2, arg3);
+ }
+}
+
EventEmitter.prototype.emit = function emit(type) {
- var er, handler, len, args, i, listeners;
+ var er, handler, len, args, i, listeners, events, domain;
+ var needDomainExit = false;
- if (!this._events)
- this._events = {};
+ events = this._events;
+ if (!events)
+ events = this._events = {};
+
+ domain = this.domain;
// If there is no 'error' event listener then throw.
- if (type === 'error' && !this._events.error) {
+ if (type === 'error' && !events.error) {
er = arguments[1];
- if (this.domain) {
+ if (domain) {
if (!er)
er = new Error('Uncaught, unspecified "error" event.');
er.domainEmitter = this;
- er.domain = this.domain;
+ er.domain = domain;
er.domainThrown = false;
- this.domain.emit('error', er);
+ domain.emit('error', er);
} else if (er instanceof Error) {
throw er; // Unhandled 'error' event
} else {
return false;
}
- handler = this._events[type];
+ handler = events[type];
- if (handler === undefined)
+ if (!handler)
return false;
- if (this.domain && this !== process)
- this.domain.enter();
-
- if (typeof handler === 'function') {
- switch (arguments.length) {
- // fast cases
- case 1:
- handler.call(this);
- break;
- case 2:
- handler.call(this, arguments[1]);
- break;
- case 3:
- handler.call(this, arguments[1], arguments[2]);
- break;
- // slower
- default:
- len = arguments.length;
- args = new Array(len - 1);
- for (i = 1; i < len; i++)
- args[i - 1] = arguments[i];
+ if (domain && this !== process) {
+ domain.enter();
+ needDomainExit = true;
+ }
+
+ var isFn = typeof handler === 'function';
+ len = arguments.length;
+ switch (len) {
+ // fast cases
+ case 1:
+ emitNone(handler, isFn, this);
+ break;
+ case 2:
+ emitOne(handler, isFn, this, arguments[1]);
+ break;
+ case 3:
+ emitTwo(handler, isFn, this, arguments[1], arguments[2]);
+ break;
+ case 4:
+ emitThree(handler, isFn, this, arguments[1], arguments[2], arguments[3]);
+ break;
+ // slower
+ default:
+ args = new Array(len - 1);
+ for (i = 1; i < len; i++)
+ args[i - 1] = arguments[i];
+ if (isFn)
handler.apply(this, args);
- }
- } else if (handler !== null && typeof handler === 'object') {
- len = arguments.length;
- args = new Array(len - 1);
- for (i = 1; i < len; i++)
- args[i - 1] = arguments[i];
-
- listeners = handler.slice();
- len = listeners.length;
- for (i = 0; i < len; i++)
- listeners[i].apply(this, args);
+ else {
+ len = handler.length;
+ listeners = arrayClone(handler, len);
+ for (i = 0; i < len; ++i)
+ listeners[i].apply(this, args);
+ }
}
- if (this.domain && this !== process)
- this.domain.exit();
+ if (needDomainExit)
+ domain.exit();
return true;
};
EventEmitter.prototype.addListener = function addListener(type, listener) {
var m;
+ var events;
+ var existing;
if (typeof listener !== 'function')
- throw TypeError('listener must be a function');
-
- if (!this._events)
- this._events = {};
-
- // To avoid recursion in the case that type === "newListener"! Before
- // adding it to the listeners, first emit "newListener".
- if (this._events.newListener)
- this.emit('newListener', type,
- typeof listener.listener === 'function' ?
- listener.listener : listener);
+ throw new TypeError('listener must be a function');
+
+ events = this._events;
+ if (!events)
+ events = this._events = {};
+ else {
+ // To avoid recursion in the case that type === "newListener"! Before
+ // adding it to the listeners, first emit "newListener".
+ if (events.newListener) {
+ this.emit('newListener', type,
+ typeof listener.listener === 'function' ?
+ listener.listener : listener);
+ }
+ existing = events[type];
+ }
- if (!this._events[type])
+ if (!existing)
// Optimize the case of one listener. Don't need the extra array object.
- this._events[type] = listener;
- else if (typeof this._events[type] === 'object')
+ existing = events[type] = listener;
+ else if (typeof existing !== 'function')
// If we've already got an array, just append.
- this._events[type].push(listener);
+ existing.push(listener);
else
// Adding the second element, need to change to array.
- this._events[type] = [this._events[type], listener];
+ existing = events[type] = [existing, listener];
// Check for listener leak
- if (this._events[type] !== null && typeof this._events[type] === 'object' &&
- !this._events[type].warned) {
- var m = $getMaxListeners(this);
- if (m && m > 0 && this._events[type].length > m) {
- this._events[type].warned = true;
+ if (typeof existing !== 'function' && !existing.warned) {
+ m = $getMaxListeners(this);
+ if (m && m > 0 && existing.length > m) {
+ existing.warned = true;
console.error('(node) warning: possible EventEmitter memory ' +
'leak detected. %d %s listeners added. ' +
'Use emitter.setMaxListeners() to increase limit.',
- this._events[type].length, type);
+ existing.length, type);
console.trace();
}
}
EventEmitter.prototype.once = function once(type, listener) {
if (typeof listener !== 'function')
- throw TypeError('listener must be a function');
+ throw new TypeError('listener must be a function');
var fired = false;
// emits a 'removeListener' event iff the listener was removed
EventEmitter.prototype.removeListener =
function removeListener(type, listener) {
- var list, position, length, i;
+ var list, events, position, length, i;
if (typeof listener !== 'function')
- throw TypeError('listener must be a function');
+ throw new TypeError('listener must be a function');
- if (!this._events || !this._events[type])
+ events = this._events;
+ if (!events)
+ return this;
+
+ list = events[type];
+ if (!list)
return this;
- list = this._events[type];
length = list.length;
position = -1;
if (list === listener ||
- (typeof list.listener === 'function' &&
- list.listener === listener)) {
- delete this._events[type];
- if (this._events.removeListener)
+ (typeof list.listener === 'function' && list.listener === listener)) {
+ delete events[type];
+ if (events.removeListener)
this.emit('removeListener', type, listener);
- } else if (list !== null && typeof list === 'object') {
+ } else if (typeof list !== 'function') {
for (i = length; i-- > 0;) {
if (list[i] === listener ||
(list[i].listener && list[i].listener === listener)) {
if (list.length === 1) {
list.length = 0;
- delete this._events[type];
+ delete events[type];
} else {
spliceOne(list, position);
}
- if (this._events.removeListener)
+ if (events.removeListener)
this.emit('removeListener', type, listener);
}
EventEmitter.prototype.removeAllListeners =
function removeAllListeners(type) {
- var key, listeners;
+ var listeners, events;
- if (!this._events)
+ events = this._events;
+ if (!events)
return this;
// not listening for removeListener, no need to emit
- if (!this._events.removeListener) {
+ if (!events.removeListener) {
if (arguments.length === 0)
this._events = {};
- else if (this._events[type])
- delete this._events[type];
+ else if (events[type])
+ delete events[type];
return this;
}
// emit removeListener for all listeners on all events
if (arguments.length === 0) {
- for (key in this._events) {
+ var keys = Object.keys(events);
+ for (var i = 0, key; i < keys.length; ++i) {
+ key = keys[i];
if (key === 'removeListener') continue;
this.removeAllListeners(key);
}
return this;
}
- listeners = this._events[type];
+ listeners = events[type];
if (typeof listeners === 'function') {
this.removeListener(type, listeners);
while (listeners.length)
this.removeListener(type, listeners[listeners.length - 1]);
}
- delete this._events[type];
+ delete events[type];
return this;
};
EventEmitter.prototype.listeners = function listeners(type) {
+ var evlistener;
var ret;
- if (!this._events || !this._events[type])
+ var events = this._events;
+
+ if (!events)
ret = [];
- else if (typeof this._events[type] === 'function')
- ret = [this._events[type]];
- else
- ret = this._events[type].slice();
+ else {
+ evlistener = events[type];
+ if (!evlistener)
+ ret = [];
+ else if (typeof evlistener === 'function')
+ ret = [evlistener];
+ else
+ ret = arrayClone(evlistener);
+ }
+
return ret;
};
EventEmitter.listenerCount = function(emitter, type) {
- var ret;
- if (!emitter._events || !emitter._events[type])
- ret = 0;
- else if (typeof emitter._events[type] === 'function')
- ret = 1;
- else
- ret = emitter._events[type].length;
+ var evlistener;
+ var ret = 0;
+ var events = emitter._events;
+
+ if (events) {
+ evlistener = events[type];
+ if (typeof evlistener === 'function')
+ ret = 1;
+ else if (evlistener)
+ ret = evlistener.length;
+ }
+
return ret;
};
list[i] = list[k];
list.pop();
}
+
+function arrayClone(arr, len) {
+ var ret;
+ if (len === undefined)
+ len = arr.length;
+ if (len >= 50)
+ ret = arr.slice();
+ else {
+ ret = new Array(len);
+ for (var i = 0; i < len; i += 1)
+ ret[i] = arr[i];
+ }
+ return ret;
+}