forked from apache/pulsar
/
ProtocolHandlerWithClassLoader.java
116 lines (102 loc) · 3.8 KB
/
ProtocolHandlerWithClassLoader.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
/**
* 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 org.apache.pulsar.broker.protocol;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.socket.SocketChannel;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.util.Map;
import lombok.Data;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.apache.pulsar.broker.ServiceConfiguration;
import org.apache.pulsar.broker.service.BrokerService;
import org.apache.pulsar.common.nar.NarClassLoader;
/**
* A protocol handler with its classloader.
*/
@Slf4j
@Data
@RequiredArgsConstructor
class ProtocolHandlerWithClassLoader implements ProtocolHandler {
private final ProtocolHandler handler;
private final NarClassLoader classLoader;
@Override
public String protocolName() {
try (ClassLoaderSwitcher ignored = new ClassLoaderSwitcher(classLoader)) {
return handler.protocolName();
}
}
@Override
public boolean accept(String protocol) {
try (ClassLoaderSwitcher ignored = new ClassLoaderSwitcher(classLoader)) {
return handler.accept(protocol);
}
}
@Override
public void initialize(ServiceConfiguration conf) throws Exception {
try (ClassLoaderSwitcher ignored = new ClassLoaderSwitcher(classLoader)) {
handler.initialize(conf);
}
}
@Override
public String getProtocolDataToAdvertise() {
try (ClassLoaderSwitcher ignored = new ClassLoaderSwitcher(classLoader)) {
return handler.getProtocolDataToAdvertise();
}
}
@Override
public void start(BrokerService service) {
try (ClassLoaderSwitcher ignored = new ClassLoaderSwitcher(classLoader)) {
handler.start(service);
}
}
@Override
public Map<InetSocketAddress, ChannelInitializer<SocketChannel>> newChannelInitializers() {
try (ClassLoaderSwitcher ignored = new ClassLoaderSwitcher(classLoader)) {
return handler.newChannelInitializers();
}
}
@Override
public void close() {
try (ClassLoaderSwitcher ignored = new ClassLoaderSwitcher(classLoader)) {
handler.close();
}
try {
classLoader.close();
} catch (IOException e) {
log.warn("Failed to close the protocol handler class loader", e);
}
}
/**
* Help to switch the class loader of current thread to the NarClassLoader, and change it back when it's done.
* With the help of try-with-resources statement, the code would be cleaner than using try finally every time.
*/
private static class ClassLoaderSwitcher implements AutoCloseable {
private final ClassLoader prevClassLoader;
ClassLoaderSwitcher(ClassLoader classLoader) {
prevClassLoader = Thread.currentThread().getContextClassLoader();
Thread.currentThread().setContextClassLoader(classLoader);
}
@Override
public void close() {
Thread.currentThread().setContextClassLoader(prevClassLoader);
}
}
}