[grid] Add Node removed event

Author: pujagani

java/src/org/openqa/selenium/grid/data/NodeRemovedEvent.java

@@ -0,0 +1,40 @@
+// Licensed to the Software Freedom Conservancy (SFC) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The SFC licenses this file
+// to you 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.
+
+package org.openqa.selenium.grid.data;
+
+import org.openqa.selenium.events.Event;
+import org.openqa.selenium.events.EventListener;
+import org.openqa.selenium.events.EventName;
+import org.openqa.selenium.internal.Require;
+
+import java.util.function.Consumer;
+
+public class NodeRemovedEvent extends Event {
+
+  private static final EventName NODE_REMOVED_EVENT = new EventName("node-removed");
+
+  public NodeRemovedEvent(NodeStatus nodes) {
+    super(NODE_REMOVED_EVENT, nodes);
+  }
+
+  public static EventListener<NodeStatus> listener(Consumer<NodeStatus> handler) {
+    Require.nonNull("Handler", handler);
+
+    return new EventListener<>(NODE_REMOVED_EVENT, NodeStatus.class , handler);
+  }
+}