javax.websocket.server.ServerEndpointConfig 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 javax.websocket.server;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.ServiceLoader;
import javax.websocket.Decoder;
import javax.websocket.Encoder;
import javax.websocket.EndpointConfig;
import javax.websocket.Extension;
import javax.websocket.HandshakeResponse;
/**
* Provides configuration information for WebSocket endpoints published to a server. Applications may provide their own
* implementation or use {@link Builder}.
*/
public interface ServerEndpointConfig extends EndpointConfig {
Class getEndpointClass();
/**
* Returns the path at which this WebSocket server endpoint has been registered. It may be a path or a level 0 URI
* template.
*
* @return The registered path
*/
String getPath();
List getSubprotocols();
List getExtensions();
Configurator getConfigurator();
final class Builder {
public static Builder create(Class endpointClass, String path) {
return new Builder(endpointClass, path);
}
private final Class endpointClass;
private final String path;
private List> encoders = Collections.emptyList();
private List> decoders = Collections.emptyList();
private List subprotocols = Collections.emptyList();
private List extensions = Collections.emptyList();
private Configurator configurator = Configurator.fetchContainerDefaultConfigurator();
private Builder(Class endpointClass, String path) {
if (endpointClass == null) {
throw new IllegalArgumentException("Endpoint class may not be null");
}
if (path == null) {
throw new IllegalArgumentException("Path may not be null");
}
if (path.isEmpty()) {
throw new IllegalArgumentException("Path may not be empty");
}
if (path.charAt(0) != '/') {
throw new IllegalArgumentException("Path must start with '/'");
}
this.endpointClass = endpointClass;
this.path = path;
}
public ServerEndpointConfig build() {
return new DefaultServerEndpointConfig(endpointClass, path, subprotocols, extensions, encoders, decoders,
configurator);
}
public Builder encoders(List> encoders) {
if (encoders == null || encoders.size() == 0) {
this.encoders = Collections.emptyList();
} else {
this.encoders = Collections.unmodifiableList(encoders);
}
return this;
}
public Builder decoders(List> decoders) {
if (decoders == null || decoders.size() == 0) {
this.decoders = Collections.emptyList();
} else {
this.decoders = Collections.unmodifiableList(decoders);
}
return this;
}
public Builder subprotocols(List subprotocols) {
if (subprotocols == null || subprotocols.size() == 0) {
this.subprotocols = Collections.emptyList();
} else {
this.subprotocols = Collections.unmodifiableList(subprotocols);
}
return this;
}
public Builder extensions(List extensions) {
if (extensions == null || extensions.size() == 0) {
this.extensions = Collections.emptyList();
} else {
this.extensions = Collections.unmodifiableList(extensions);
}
return this;
}
public Builder configurator(Configurator serverEndpointConfigurator) {
if (serverEndpointConfigurator == null) {
this.configurator = Configurator.fetchContainerDefaultConfigurator();
} else {
this.configurator = serverEndpointConfigurator;
}
return this;
}
}
class Configurator {
private static volatile Configurator defaultImpl = null;
private static final Object defaultImplLock = new Object();
private static final String DEFAULT_IMPL_CLASSNAME =
"org.apache.tomcat.websocket.server.DefaultServerEndpointConfigurator";
static Configurator fetchContainerDefaultConfigurator() {
if (defaultImpl == null) {
synchronized (defaultImplLock) {
if (defaultImpl == null) {
if (System.getSecurityManager() == null) {
defaultImpl = loadDefault();
} else {
defaultImpl = AccessController.doPrivileged(new PrivilegedLoadDefault());
}
}
}
}
return defaultImpl;
}
private static Configurator loadDefault() {
Configurator result = null;
ServiceLoader serviceLoader = ServiceLoader.load(Configurator.class);
Iterator iter = serviceLoader.iterator();
while (result == null && iter.hasNext()) {
result = iter.next();
}
// Fall-back. Also used by unit tests
if (result == null) {
try {
@SuppressWarnings("unchecked")
Class clazz = (Class) Class.forName(DEFAULT_IMPL_CLASSNAME);
result = clazz.getConstructor().newInstance();
} catch (ReflectiveOperationException | IllegalArgumentException | SecurityException e) {
// No options left. Just return null.
}
}
return result;
}
private static class PrivilegedLoadDefault implements PrivilegedAction {
@Override
public Configurator run() {
return Configurator.loadDefault();
}
}
public String getNegotiatedSubprotocol(List supported, List requested) {
return fetchContainerDefaultConfigurator().getNegotiatedSubprotocol(supported, requested);
}
public List getNegotiatedExtensions(List installed, List requested) {
return fetchContainerDefaultConfigurator().getNegotiatedExtensions(installed, requested);
}
public boolean checkOrigin(String originHeaderValue) {
return fetchContainerDefaultConfigurator().checkOrigin(originHeaderValue);
}
public void modifyHandshake(ServerEndpointConfig sec, HandshakeRequest request, HandshakeResponse response) {
fetchContainerDefaultConfigurator().modifyHandshake(sec, request, response);
}
public T getEndpointInstance(Class clazz) throws InstantiationException {
return fetchContainerDefaultConfigurator().getEndpointInstance(clazz);
}
}
}