Process output using tick function rather than clock message

src/nodeClass.js

@@ -21,6 +21,8 @@ class nodeClass {
 
         this._attachInputHandler();
         this._registerChild();
+        this._startTickLoop();
+        this._attachCloseHandler();
     }
 
     /**
@@ -32,7 +34,6 @@ class nodeClass {
             switch (msg.topic) {
                 case "clock":
                     this.source.updateState(msg.timestamp);
-                    send([this.source.getEffluent, null, null]);
                     send([msg, null, null]);
                     break;
                 case "Fluent":
@@ -137,6 +138,22 @@ class nodeClass {
         this.node.source = this.source;
     }
 
+    _startTickLoop() {
+        setTimeout(() => {
+            this._tickInterval = setInterval(() => this._tick(), 1000);
+        }, 1000);
+    }
+
+    _tick(){
+        this.node.send([this.source.getEffluent, null, null]);
+    }
+
+    _attachCloseHandler() {
+        this.node.on('close', (done) => {
+            clearInterval(this._tickInterval);
+            done();
+        });
+    }
 }
 
 module.exports = nodeClass;