1 /*
2 * Copyright 2008-2019 by Emeric Vernat
3 *
4 * This file is part of Java Melody.
5 *
6 * Licensed under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 */
18 package net.bull.javamelody.internal.web;
19
20 import java.io.IOException;
21
22 import javax.servlet.ServletOutputStream;
23 import javax.servlet.http.HttpServletResponse;
24
25 /**
26 * Implémentation de {@link FilterServletResponseWrapper} qui fonctionne avec le {@link CounterResponseStream},
27 * pour calculer la taille du flux de réponse.
28 * @author Emeric Vernat
29 */
30 public class CounterServletResponseWrapper extends FilterServletResponseWrapper {
31 /**
32 * Constructeur qui crée un adapteur de HttpServletResponse wrappant la response spécifiée.
33 * @param response HttpServletResponse
34 */
35 public CounterServletResponseWrapper(HttpServletResponse response) {
36 super(response);
37 assert response != null;
38 }
39
40 /**
41 * Retourne la taille en octets du flux écrit dans la réponse.
42 * @return long
43 */
44 public long getDataLength() {
45 return getCounterResponseStream() == null ? 0 : getCounterResponseStream().getDataLength();
46 }
47
48 /** {@inheritDoc} */
49 @Override
50 public void reset() {
51 super.reset();
52 resetStream();
53 }
54
55 /** {@inheritDoc} */
56 @Override
57 public void resetBuffer() {
58 super.resetBuffer();
59 resetStream();
60 }
61
62 private void resetStream() {
63 if (getCounterResponseStream() != null) {
64 getCounterResponseStream().reset();
65 }
66 }
67
68 private CounterResponseStream getCounterResponseStream() {
69 return (CounterResponseStream) getStream();
70 }
71
72 /** {@inheritDoc} */
73 @Override
74 public ServletOutputStream createOutputStream() throws IOException {
75 return new CounterResponseStream(getHttpServletResponse());
76 }
77 }
78