Optimize: Use callbacks instead of events in net2

lib/http2.js

@@ -387,12 +387,11 @@ function connectionListener (socket) {
   // we need to keep track of the order they were sent.
   var responses = [];
 
-  socket.addListener('dataLite', function (d, start, end) {
+  socket.ondata = function (d, start, end) {
     parser.execute(d, start, end - start);
-  });
+  };
 
-  // is this really needed?
-  socket.addListener('end', function () {
+  socket.onend = function () {
     parser.finish();
     // unref the parser for easy gc
     freeParser(parser);
@@ -402,7 +401,7 @@ function connectionListener (socket) {
     } else {
       responses[responses.length-1].closeOnFinish = true;
     }
-  });
+  };
 
   parser.socket = socket;
   // The following callback is issued after the headers have been read on a

lib/net.js

@@ -1,3 +1,4 @@
+var sys = require("./sys");
 var debugLevel = 0;
 if ('NODE_DEBUG' in process.ENV) debugLevel = 1;
 function debug (x) {
@@ -118,19 +119,23 @@ function Socket (peerInfo) {
     if (!recvMsg.fd && bytesRead == 0) {
       self.readable = false;
       self._readWatcher.stop();
-      self.emit('end');
+
+      if (self._events && self._events['end']) self.emit('end');
+      if (self.onend) self.onend();
+
       if (!self.writable) self.forceClose();
     } else if (bytesRead > 0) {
       var start = recvBuffer.used;
       var end = recvBuffer.used + bytesRead;
-      if (self.listeners('data').length) {
+      
+      if (self._events && self._events['data']) {
         // emit a slice
         self.emit('data', recvBuffer.slice(start, end));
       }
-      if (self.listeners('dataLite').length) {
-        // emit the original buffer with end points.
-        self.emit('dataLite', recvBuffer, start, end);
-      }
+
+      // Optimization: emit the original buffer with end points
+      if (self.ondata) self.ondata(recvBuffer, start, end);
+
       recvBuffer.used += bytesRead;
     }
   };
@@ -141,15 +146,17 @@ function Socket (peerInfo) {
   self.sendQueueSize = 0; // in bytes, not to be confused with sendQueue.length!
   self.sendMessageQueueSize = 0; // number of messages remaining to be sent
   self._doFlush = function () {
-    /* Socket becomes writeable on connect() but don't flush if there's
-     * nothing actually to write */
+    // Socket becomes writeable on connect() but don't flush if there's
+    // nothing actually to write
     if ((self.sendQueueSize == 0) && (self.sendMessageQueueSize == 0)) {
         return;
     }
     if (self.flush()) {
       assert(self.sendQueueSize == 0);
       assert(self.sendMessageQueueSize == 0);
-      self.emit("drain");
+
+      if (self._events && self._events['drain']) self.emit("drain");
+      if (self.ondrain) self.ondrain(); // Optimization
     }
   };
   self._writeWatcher = ioWatchers.alloc();
@@ -302,7 +309,8 @@ Socket.prototype.sendFD = function(socketToPass) {
 };
 
 
-// Flushes the write buffer out. Emits "drain" if the buffer is empty.
+// Flushes the write buffer out.
+// Returns true if the entire buffer was flushed.
 Socket.prototype.flush = function () {
   var self = this;
 
@@ -314,7 +322,7 @@ Socket.prototype.flush = function () {
 
     if (b == END_OF_FILE) {
       self._shutdown();
-      break;
+      return false;
     }
 
     if (b.sent == b.used) {
@@ -338,7 +346,7 @@ Socket.prototype.flush = function () {
       }
     } catch (e) {
       self.forceClose(e);
-      return;
+      return false;
     }
 
     if (bytesWritten === null) {