Remove StatWatcher's dep on C++ EventEmitter

lib/fs.js

@@ -25,6 +25,7 @@ var binding = process.binding('fs');
 var constants = process.binding('constants');
 var fs = exports;
 var Stream = require('stream').Stream;
+var EventEmitter = require('events').EventEmitter;
 
 var kMinPoolSpace = 128;
 var kPoolSize = 40 * 1024;
@@ -587,8 +588,34 @@ fs.writeFileSync = function(path, data, encoding) {
 
 // Stat Change Watchers
 
+function StatWatcher() {
+  var self = this;
+  this._handle = new binding.StatWatcher();
+
+  this._handle.onchange = function(current, previous) {
+    self.emit('change', current, previous);   
+  };
+
+  this._handle.onstop = function() {
+    self.emit('stop');   
+  };
+}
+util.inherits(StatWatcher, EventEmitter);
+
+
+StatWatcher.prototype.start = function(filename, persistent, interval) {
+  this._handle.start(filename, persistent, interval);
+};
+
+
+StatWatcher.prototype.stop = function() {
+  this._handle.stop();
+};
+
+
 var statWatchers = {};
 
+
 fs.watchFile = function(filename) {
   var stat;
   var options;
@@ -608,7 +635,7 @@ fs.watchFile = function(filename) {
   if (statWatchers[filename]) {
     stat = statWatchers[filename];
   } else {
-    statWatchers[filename] = new binding.StatWatcher();
+    statWatchers[filename] = new StatWatcher();
     stat = statWatchers[filename];
     stat.start(filename, options.persistent, options.interval);
   }

src/node_stat_watcher.cc

@@ -31,21 +31,14 @@ using namespace v8;
 
 Persistent<FunctionTemplate> StatWatcher::constructor_template;
 
-static Persistent<String> change_symbol;
-static Persistent<String> stop_symbol;
-
 void StatWatcher::Initialize(Handle<Object> target) {
   HandleScope scope;
 
   Local<FunctionTemplate> t = FunctionTemplate::New(StatWatcher::New);
   constructor_template = Persistent<FunctionTemplate>::New(t);
-  constructor_template->Inherit(EventEmitter::constructor_template);
   constructor_template->InstanceTemplate()->SetInternalFieldCount(1);
   constructor_template->SetClassName(String::NewSymbol("StatWatcher"));
 
-  change_symbol = NODE_PSYMBOL("change");
-  stop_symbol = NODE_PSYMBOL("stop");
-
   NODE_SET_PROTOTYPE_METHOD(constructor_template, "start", StatWatcher::Start);
   NODE_SET_PROTOTYPE_METHOD(constructor_template, "stop", StatWatcher::Stop);
 
@@ -61,7 +54,7 @@ void StatWatcher::Callback(EV_P_ ev_stat *watcher, int revents) {
   Handle<Value> argv[2];
   argv[0] = Handle<Value>(BuildStatsObject(&watcher->attr));
   argv[1] = Handle<Value>(BuildStatsObject(&watcher->prev));
-  handler->Emit(change_symbol, 2, argv);
+  MakeCallback(handler->handle_, "onchange", 2, argv);
 }
 
 
@@ -113,7 +106,7 @@ Handle<Value> StatWatcher::Start(const Arguments& args) {
 Handle<Value> StatWatcher::Stop(const Arguments& args) {
   HandleScope scope;
   StatWatcher *handler = ObjectWrap::Unwrap<StatWatcher>(args.Holder());
-  handler->Emit(stop_symbol, 0, NULL);
+  MakeCallback(handler->handle_, "onstop", 0, NULL);
   handler->Stop();
   return Undefined();
 }

src/node_stat_watcher.h

@@ -28,14 +28,14 @@
 
 namespace node {
 
-class StatWatcher : EventEmitter {
+class StatWatcher : ObjectWrap {
  public:
   static void Initialize(v8::Handle<v8::Object> target);
 
  protected:
   static v8::Persistent<v8::FunctionTemplate> constructor_template;
 
-  StatWatcher() : EventEmitter() {
+  StatWatcher() : ObjectWrap() {
     persistent_ = false;
     path_ = NULL;
     ev_init(&watcher_, StatWatcher::Callback);