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
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
|
/*
* 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.tomcat.websocket.server;
import java.lang.reflect.Modifier;
import java.util.HashSet;
import java.util.Set;
import javax.servlet.ServletContainerInitializer;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.HandlesTypes;
import javax.websocket.ContainerProvider;
import javax.websocket.DeploymentException;
import javax.websocket.Endpoint;
import javax.websocket.server.ServerApplicationConfig;
import javax.websocket.server.ServerEndpoint;
import javax.websocket.server.ServerEndpointConfig;
import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;
import org.apache.tomcat.util.res.StringManager;
/**
* Registers an interest in any class that is annotated with
* {@link ServerEndpoint} so that Endpoint can be published via the WebSocket
* server.
*/
@HandlesTypes({ServerEndpoint.class, ServerApplicationConfig.class,
Endpoint.class})
public class WsSci implements ServletContainerInitializer {
private static boolean logMessageWritten = false;
private static final Log log =
LogFactory.getLog(WsSci.class);
private static final StringManager sm =
StringManager.getManager(Constants.PACKAGE_NAME);
@Override
public void onStartup(Set<Class<?>> clazzes, ServletContext ctx)
throws ServletException {
if (!isJava7OrLater()) {
// The WebSocket implementation requires Java 7 so don't initialise
// it if Java 7 is not available.
if (!logMessageWritten) {
logMessageWritten = true;
log.info(sm.getString("sci.noWebSocketSupport"));
}
return;
}
WsServerContainer sc = init(ctx, true);
if (clazzes == null || clazzes.size() == 0) {
return;
}
// Group the discovered classes by type
Set<ServerApplicationConfig> serverApplicationConfigs = new HashSet<ServerApplicationConfig>();
Set<Class<? extends Endpoint>> scannedEndpointClazzes = new HashSet<Class<? extends Endpoint>>();
Set<Class<?>> scannedPojoEndpoints = new HashSet<Class<?>>();
try {
// wsPackage is "javax.websocket."
String wsPackage = ContainerProvider.class.getName();
wsPackage = wsPackage.substring(0, wsPackage.lastIndexOf('.') + 1);
for (Class<?> clazz : clazzes) {
int modifiers = clazz.getModifiers();
if (!Modifier.isPublic(modifiers) ||
Modifier.isAbstract(modifiers)) {
// Non-public or abstract - skip it.
continue;
}
// Protect against scanning the WebSocket API JARs
if (clazz.getName().startsWith(wsPackage)) {
continue;
}
if (ServerApplicationConfig.class.isAssignableFrom(clazz)) {
serverApplicationConfigs.add(
(ServerApplicationConfig) clazz.newInstance());
}
if (Endpoint.class.isAssignableFrom(clazz)) {
@SuppressWarnings("unchecked")
Class<? extends Endpoint> endpoint =
(Class<? extends Endpoint>) clazz;
scannedEndpointClazzes.add(endpoint);
}
if (clazz.isAnnotationPresent(ServerEndpoint.class)) {
scannedPojoEndpoints.add(clazz);
}
}
} catch (InstantiationException e) {
throw new ServletException(e);
} catch (IllegalAccessException e) {
throw new ServletException(e);
}
// Filter the results
Set<ServerEndpointConfig> filteredEndpointConfigs = new HashSet<ServerEndpointConfig>();
Set<Class<?>> filteredPojoEndpoints = new HashSet<Class<?>>();
if (serverApplicationConfigs.isEmpty()) {
filteredPojoEndpoints.addAll(scannedPojoEndpoints);
} else {
for (ServerApplicationConfig config : serverApplicationConfigs) {
Set<ServerEndpointConfig> configFilteredEndpoints =
config.getEndpointConfigs(scannedEndpointClazzes);
if (configFilteredEndpoints != null) {
filteredEndpointConfigs.addAll(configFilteredEndpoints);
}
Set<Class<?>> configFilteredPojos =
config.getAnnotatedEndpointClasses(
scannedPojoEndpoints);
if (configFilteredPojos != null) {
filteredPojoEndpoints.addAll(configFilteredPojos);
}
}
}
try {
// Deploy endpoints
for (ServerEndpointConfig config : filteredEndpointConfigs) {
sc.addEndpoint(config);
}
// Deploy POJOs
for (Class<?> clazz : filteredPojoEndpoints) {
sc.addEndpoint(clazz);
}
} catch (DeploymentException e) {
throw new ServletException(e);
}
}
static WsServerContainer init(ServletContext servletContext,
boolean initBySciMechanism) {
WsServerContainer sc = new WsServerContainer(servletContext);
servletContext.setAttribute(
Constants.SERVER_CONTAINER_SERVLET_CONTEXT_ATTRIBUTE, sc);
servletContext.addListener(new WsSessionListener(sc));
// Can't register the ContextListener again if the ContextListener is
// calling this method
if (initBySciMechanism) {
servletContext.addListener(new WsContextListener());
}
return sc;
}
private static boolean isJava7OrLater() {
try {
Class.forName("java.nio.channels.AsynchronousSocketChannel");
} catch (ClassNotFoundException e) {
return false;
}
return true;
}
}
|
