record_detail autoupdate

hydro/service/bus.js

@@ -0,0 +1,15 @@
+const EventEmitter = require('events').EventEmitter;
+const bus = new EventEmitter();
+module.exports = {
+    subscribe(events, handler) {
+        for (let event of events)
+            bus.on(event, handler);
+    },
+    unsubscribe(events, handler) {
+        for (let event of events)
+            bus.off(event, handler);
+    },
+    publish(event, data) {
+        bus.emit(event, { value: data, event });
+    }
+};