org.apache.tomcat.websocket.server.WsSci Maven / Gradle / Ivy
/*
* 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 final Log log = LogFactory.getLog(WsSci.class); // must not be static
private static final StringManager sm =
StringManager.getManager(Constants.PACKAGE_NAME);
@Override
public void onStartup(Set> 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 serverApplicationConfigs = new HashSet();
Set> scannedEndpointClazzes = new HashSet>();
Set> scannedPojoEndpoints = new HashSet>();
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 endpoint =
(Class) 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 filteredEndpointConfigs = new HashSet();
Set> filteredPojoEndpoints = new HashSet>();
if (serverApplicationConfigs.isEmpty()) {
filteredPojoEndpoints.addAll(scannedPojoEndpoints);
} else {
for (ServerApplicationConfig config : serverApplicationConfigs) {
Set configFilteredEndpoints =
config.getEndpointConfigs(scannedEndpointClazzes);
if (configFilteredEndpoints != null) {
filteredEndpointConfigs.addAll(configFilteredEndpoints);
}
Set> 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;
}
}