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java/javax/websocket/Endpoint.java

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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF 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 javax.websocket;
+
+public abstract class Endpoint {
+
+    /**
+     * Event that is triggered when a new session starts.
+     *
+     * @param session   The new session.
+     * @param config    The configuration with which the Endpoint was
+     *                  configured.
+     */
+    public abstract void onOpen(Session session, EndpointConfig config);
+
+    /**
+     * Event that is triggered when a session has closed.
+     *
+     * @param session       The session
+     * @param closeReason   Why the session was closed
+     */
+    public void onClose(Session session, CloseReason closeReason) {
+        // NO-OP by default
+    }
+
+    /**
+     * Event that is triggered when a protocol error occurs.
+     *
+     * @param session   The session.
+     * @param throwable The exception.
+     */
+    public void onError(Session session, Throwable throwable) {
+        // NO-OP by default
+    }
+}