1 /*
2  * Licensed to the Apache Software Foundation (ASF) under one or more
3  * contributor license agreements.  See the NOTICE file distributed with
4  * this work for additional information regarding copyright ownership.
5  * The ASF licenses this file to You under the Apache License, Version 2.0
6  * (the "License"); you may not use this file except in compliance with
7  * the License.  You may obtain a copy of the License at
8  *
9  *     http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17 package nginx.unit.websocket.pojo;
18 
19 import java.lang.reflect.InvocationTargetException;
20 import java.lang.reflect.Method;
21 import java.nio.ByteBuffer;
22 
23 import javax.websocket.DecodeException;
24 import javax.websocket.MessageHandler;
25 import javax.websocket.Session;
26 
27 import nginx.unit.websocket.WsSession;
28 
29 /**
30  * Common implementation code for the POJO partial message handlers. All
31  * the real work is done in this class and in the superclass.
32  *
33  * @param <T>   The type of message to handle
34  */
35 public abstract class PojoMessageHandlerPartialBase<T>
36         extends PojoMessageHandlerBase<T> implements MessageHandler.Partial<T> {
37 
38     private final int indexBoolean;
39 
PojoMessageHandlerPartialBase(Object pojo, Method method, Session session, Object[] params, int indexPayload, boolean convert, int indexBoolean, int indexSession, long maxMessageSize)40     public PojoMessageHandlerPartialBase(Object pojo, Method method,
41             Session session, Object[] params, int indexPayload,
42             boolean convert, int indexBoolean, int indexSession,
43             long maxMessageSize) {
44         super(pojo, method, session, params, indexPayload, convert,
45                 indexSession, maxMessageSize);
46         this.indexBoolean = indexBoolean;
47     }
48 
49 
50     @Override
onMessage(T message, boolean last)51     public final void onMessage(T message, boolean last) {
52         if (params.length == 1 && params[0] instanceof DecodeException) {
53             ((WsSession) session).getLocal().onError(session,
54                     (DecodeException) params[0]);
55             return;
56         }
57         Object[] parameters = params.clone();
58         if (indexBoolean != -1) {
59             parameters[indexBoolean] = Boolean.valueOf(last);
60         }
61         if (indexSession != -1) {
62             parameters[indexSession] = session;
63         }
64         if (convert) {
65             parameters[indexPayload] = ((ByteBuffer) message).array();
66         } else {
67             parameters[indexPayload] = message;
68         }
69         Object result = null;
70         try {
71             result = method.invoke(pojo, parameters);
72         } catch (IllegalAccessException | InvocationTargetException e) {
73             handlePojoMethodException(e);
74         }
75         processResult(result);
76     }
77 }
78