Implemented WebSockets for GUI2

Change-Id: I4776ce392b1e8e94ebee938cf7df22791a1e0b8f
diff --git a/web/gui2/src/main/webapp/app/fw/layer/veil/veil.component.ts b/web/gui2/src/main/webapp/app/fw/layer/veil/veil.component.ts
new file mode 100644
index 0000000..cea6bed
--- /dev/null
+++ b/web/gui2/src/main/webapp/app/fw/layer/veil/veil.component.ts
@@ -0,0 +1,86 @@
+/*
+ * Copyright 2015-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import { Component, OnInit } from '@angular/core';
+import { FnService } from '../../util/fn.service';
+import { GlyphService } from '../../svg/glyph.service';
+import { KeyService } from '../../util/key.service';
+import { LogService } from '../../../log.service';
+import { SvgUtilService } from '../../svg/svgutil.service';
+import { WebSocketService } from '../../remote/websocket.service';
+
+const BIRD = 'bird';
+
+/**
+ * ONOS GUI -- Layer -- Veil Component
+ *
+ * Provides a mechanism to display an overlaying div with information.
+ * Used mainly for web socket connection interruption.
+ *
+ * It can be added to an component's template as follows:
+ *     <onos-veil #veil></onos-veil>
+ *     <p (click)="veil.show(['t1','t2','t3'])">Test Veil</p>
+ */
+@Component({
+  selector: 'onos-veil',
+  templateUrl: './veil.component.html',
+  styleUrls: ['./veil.component.css', './veil.component.theme.css']
+})
+export class VeilComponent implements OnInit {
+    ww: number;
+    wh: number;
+    birdSvg: string;
+    birdDim: number;
+    enabled: boolean = false;
+    trans: string;
+    messages: string[] = [];
+    veilStyle: string;
+
+    constructor(
+        private fs: FnService,
+        private gs: GlyphService,
+        private ks: KeyService,
+        private log: LogService,
+        private sus: SvgUtilService,
+        private wss: WebSocketService
+    ) {
+        const wSize = this.fs.windowSize();
+        this.ww = wSize.width;
+        this.wh = wSize.height;
+        const shrink = this.wh * 0.3;
+        this.birdDim = this.wh - shrink;
+        const birdCenter = (this.ww - this.birdDim) / 2;
+        this.trans = this.sus.translate([birdCenter, shrink / 2]);
+
+        this.log.debug('VeilComponent with ' + BIRD + ' constructed');
+    }
+
+    ngOnInit() {
+    }
+
+    // msg should be an array of strings
+    show(msgs: string[]): void {
+        this.messages = msgs;
+        this.enabled = true;
+//        this.ks.enableKeys(false);
+    }
+
+    hide(): void {
+        this.veilStyle = 'display: none';
+//        this.ks.enableKeys(true);
+    }
+
+
+}