Implement WebSocketServer Adapter (#5866)

* Implement WebSocketServerAdapter

* lint

* clean up

src/Adapters/WebSocketServer/WSAdapter.js

@@ -0,0 +1,22 @@
+/*eslint no-unused-vars: "off"*/
+import { WSSAdapter } from './WSSAdapter';
+const WebSocketServer = require('ws').Server;
+
+/**
+ * Wrapper for ws node module
+ */
+export class WSAdapter extends WSSAdapter {
+  constructor(options: any) {
+    super(options);
+    const wss = new WebSocketServer({ server: options.server });
+    wss.on('listening', this.onListen);
+    wss.on('connection', this.onConnection);
+  }
+
+  onListen() {}
+  onConnection(ws) {}
+  start() {}
+  close() {}
+}
+
+export default WSAdapter;

src/Adapters/WebSocketServer/WSSAdapter.js

@@ -0,0 +1,52 @@
+/*eslint no-unused-vars: "off"*/
+// WebSocketServer Adapter
+//
+// Adapter classes must implement the following functions:
+// * onListen()
+// * onConnection(ws)
+// * start()
+// * close()
+//
+// Default is WSAdapter. The above functions will be binded.
+
+/**
+ * @module Adapters
+ */
+/**
+ * @interface WSSAdapter
+ */
+export class WSSAdapter {
+  /**
+   * @param {Object} options - {http.Server|https.Server} server
+   */
+  constructor(options) {
+    this.onListen = () => {}
+    this.onConnection = () => {}
+  }
+
+  // /**
+  //  * Emitted when the underlying server has been bound.
+  //  */
+  // onListen() {}
+
+  // /**
+  //  * Emitted when the handshake is complete.
+  //  *
+  //  * @param {WebSocket} ws - RFC 6455 WebSocket.
+  //  */
+  // onConnection(ws) {}
+
+  /**
+   * Initialize Connection.
+   *
+   * @param {Object} options
+   */
+  start(options) {}
+
+  /**
+   * Closes server.
+   */
+  close() {}
+}
+
+export default WSSAdapter;