1 /*
2 * ====================================================================
3 * Licensed to the Apache Software Foundation (ASF) under one
4 * or more contributor license agreements. See the NOTICE file
5 * distributed with this work for additional information
6 * regarding copyright ownership. The ASF licenses this file
7 * to you under the Apache License, Version 2.0 (the
8 * "License"); you may not use this file except in compliance
9 * with the License. You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing,
14 * software distributed under the License is distributed on an
15 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
16 * KIND, either express or implied. See the License for the
17 * specific language governing permissions and limitations
18 * under the License.
19 * ====================================================================
20 *
21 * This software consists of voluntary contributions made by many
22 * individuals on behalf of the Apache Software Foundation. For more
23 * information on the Apache Software Foundation, please see
24 * <http://www.apache.org/>.
25 *
26 */
27 package org.apache.hc.core5.http2.nio.support;
28
29 import java.io.IOException;
30 import java.nio.ByteBuffer;
31
32 import org.apache.hc.core5.function.Callback;
33 import org.apache.hc.core5.http.HttpException;
34 import org.apache.hc.core5.http2.nio.AsyncPingHandler;
35 import org.apache.hc.core5.util.Args;
36
37 /**
38 * Basic {@link AsyncPingHandler} implementation.
39 *
40 * @since 5.0
41 */
42 public class BasicPingHandler implements AsyncPingHandler {
43
44 private static final byte[] PING_MESSAGE = new byte[] {'*', '*', 'p', 'i', 'n', 'g', '*', '*'};
45
46 private final Callback<Boolean> callback;
47
48 public BasicPingHandler(final Callback<Boolean> callback) {
49 this.callback = Args.notNull(callback, "Callback");
50 }
51
52 @Override
53 public ByteBuffer getData() {
54 return ByteBuffer.wrap(PING_MESSAGE);
55 }
56
57 @Override
58 public void consumeResponse(final ByteBuffer feedback) throws HttpException, IOException {
59 boolean result = true;
60 for (int i = 0; i < PING_MESSAGE.length; i++) {
61 if (!feedback.hasRemaining() || PING_MESSAGE[i] != feedback.get()) {
62 result = false;
63 break;
64 }
65 }
66 callback.execute(result);
67 }
68
69 @Override
70 public void failed(final Exception cause) {
71 callback.execute(Boolean.FALSE);
72 }
73
74 @Override
75 public void cancel() {
76 callback.execute(Boolean.FALSE);
77 }
78
79 }