Refactor broadcating message to threads

PR-URL: #1920

impress.js

@@ -52,6 +52,12 @@ const logError = (type) => (err) => {
   if (impress.initialization) exit('Can not start Application server', 1);
 };
 
+const broadcast = (app, data) => {
+  for (const thread of app.threads.values()) {
+    thread.postMessage(data);
+  }
+};
+
 const startWorker = async (app, kind, port, id = ++impress.lastWorkerId) => {
   const workerData = { id, kind, root: app.root, path: app.path, port };
   const execArgv = [...process.execArgv, `--test-reporter=${REPORTER_PATH}`];
@@ -178,13 +184,6 @@ const loadApplications = async () => {
   }
 };
 
-const stopApplication = (dir) => {
-  const app = impress.applications.get(dir);
-  for (const thread of app.threads.values()) {
-    thread.postMessage({ name: 'stop' });
-  }
-};
-
 const stop = async (code = 0) => {
   const portsClosed = new Promise((resolve) => {
     impress.console.info('Graceful shutdown in worker 0');
@@ -198,7 +197,7 @@ const stop = async (code = 0) => {
     };
   });
   for (const app of impress.applications.values()) {
-    stopApplication(app.path);
+    broadcast(app, { name: 'stop' });
   }
   await portsClosed;
   exit('Application server stopped', code);