.

qwen/nodejs/node_modules/nodemon/lib/utils/bus.js

@@ -0,0 +1,44 @@
+var events = require('events');
+var debug = require('debug')('nodemon');
+var util = require('util');
+
+var Bus = function () {
+  events.EventEmitter.call(this);
+};
+
+util.inherits(Bus, events.EventEmitter);
+
+var bus = new Bus();
+
+// /*
+var collected = {};
+bus.on('newListener', function (event) {
+  debug('bus new listener: %s (%s)', event, bus.listeners(event).length);
+  if (!collected[event]) {
+    collected[event] = true;
+    bus.on(event, function () {
+      debug('bus emit: %s', event);
+    });
+  }
+});
+
+// */
+
+// proxy process messages (if forked) to the bus
+process.on('message', function (event) {
+  debug('process.message(%s)', event);
+  bus.emit(event);
+});
+
+var emit = bus.emit;
+
+// if nodemon was spawned via a fork, allow upstream communication
+// via process.send
+if (process.send) {
+  bus.emit = function (event, data) {
+    process.send({ type: event, data: data });
+    emit.apply(bus, arguments);
+  };
+}
+
+module.exports = bus;