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package javax.websocket.server;
import java.util.
ArrayList;
import java.util.
Collections;
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;
/**
* The ServerEndpointConfig is a special kind of endpoint configuration object that contains
* web socket configuration information specific only to server endpoints. For developers
* deploying programmatic endpoints, ServerEndpointConfig objects
* can be created using a {@link ServerEndpointConfig.Builder}. Certain configuration
* operations can be customized by providing a {@link ServerEndpointConfig.Configurator}
*
* @author dannycoward
*/
public interface
ServerEndpointConfig extends
EndpointConfig {
/**
* Returns the Class of the endpoint this configuration is configuring. If
* the endpoint is an annotated endpoint, the value is the class of the Java class
* annotated with @ServerEndpoint. if the endpoint is a programmatic, the value
* is the class of the subclass of Endpoint.
*
* @return the class of the endpoint, annotated or programmatic.
*/
Class<?>
getEndpointClass();
/**
* Return the path for this endpoint configuration. The path is the URI or
* URI-template (level 1) relative to the websocket root of the server to which the
* endpoint using this configuration will be mapped. The path is always non-null
* and always begins with a leading "/".
*
* @return the relative path for this configuration.
*/
String getPath();
/**
* Return the websocket subprotocols configured.
*
* @return the list of subprotocols, the empty list if none
*/
List<
String>
getSubprotocols();
/**
* Return the websocket extensions configured.
*
* @return the list of extensions, the empty list if none.
*/
List<
Extension>
getExtensions();
/**
* Return the {@link ServerEndpointConfig.Configurator} this configuration
* is using. If none was set by calling
* {@link ServerEndpointConfig.Builder#configurator(javax.websocket.server.ServerEndpointConfig.Configurator) }
* this methods returns the platform default configurator.
*
* @return the configurator in use.
*/
ServerEndpointConfig.
Configurator getConfigurator();
/**
* The ServerEndpointConfig.Configurator class may be extended by developers who want to
* provide custom configuration algorithms, such as intercepting the opening handshake, or
* providing arbitrary methods and algorithms that can be accessed from each endpoint
* instance configured with this configurator.
*
* The implementation must provide a platform default configurator loading using the service
* loader.
*/
public class
Configurator {
private
ServerEndpointConfig.
Configurator containerDefaultConfigurator;
static
ServerEndpointConfig.
Configurator fetchContainerDefaultConfigurator() {
for (
ServerEndpointConfig.
Configurator impl :
ServiceLoader.
load(javax.websocket.server.
ServerEndpointConfig.
Configurator.class)) {
return
impl;
}
throw new
RuntimeException("Cannot load platform configurator");
}
ServerEndpointConfig.
Configurator getContainerDefaultConfigurator() {
if (this.
containerDefaultConfigurator == null) {
this.
containerDefaultConfigurator =
fetchContainerDefaultConfigurator();
}
return this.
containerDefaultConfigurator;
}
/**
* Return the subprotocol the server endpoint has chosen from the requested
* list supplied by a client who wishes to connect, or none if there wasn't one
* this server endpoint liked. See
* <a href="http://tools.ietf.org/html/rfc6455#section-4.2.2">Sending the
* Server's Opening Handshake</a>. Subclasses may provide custom algorithms
* based on other factors.
*
* <p>The default platform implementation of this method returns the first
* subprotocol in the list sent by the client that the server supports,
* or the empty string if there isn't one.
*
* @param requested the requested subprotocols from the client endpoint
* @param supported the subprotocols supported by the server endpoint
* @return the negotiated subprotocol or the empty string if there isn't one.
*/
public
String getNegotiatedSubprotocol(
List<
String>
supported,
List<
String>
requested) {
return this.
getContainerDefaultConfigurator().
getNegotiatedSubprotocol(
supported,
requested);
}
/**
* Return the ordered list of extensions that t server endpoint will support
* given the requested extension list passed in, the empty list if none. See
* <a href="http://tools.ietf.org/html/rfc6455#section-9.1">Negotiating Extensions</a>
*
* <p>The default platform implementation of this method returns a list
* containing all of the requested extensions passed to this method that
* it supports, using the order in the requested extensions, the empty
* list if none.
*
* @param installed the installed extensions on the implementation.
* @param requested the requested extensions, in the order they were
* requested by the client
* @return the list of extensions negotiated, the empty list if none.
*/
public
List<
Extension>
getNegotiatedExtensions(
List<
Extension>
installed,
List<
Extension>
requested) {
return this.
getContainerDefaultConfigurator().
getNegotiatedExtensions(
installed,
requested);
}
/**
* Check the value of the Origin header (<a href="http://tools.ietf.org/html/rfc6454">See Origin Header</a>) the client passed during the opening
* handshake.
*
* <p>The platform default implementation of this method makes a check of the
* validity of the Origin header sent along with
* the opening handshake following the recommendation at:
* <a href="http://tools.ietf.org/html/rfc6455#section-4.2">Sending
* the Server's Opening Handshake</a>.
*
* @param originHeaderValue the value of the origin header passed
* by the client.
* @return whether the check passed or not
*/
public boolean
checkOrigin(
String originHeaderValue) {
return this.
getContainerDefaultConfigurator().
checkOrigin(
originHeaderValue);
}
/**
* Called by the container after it has formulated a handshake response resulting from
* a well-formed handshake request. The container has already
* checked that this configuration has a matching URI, determined the
* validity of the origin using the checkOrigin method, and filled
* out the negotiated subprotocols and extensions based on this configuration.
* Custom configurations may override this method in order to inspect
* the request parameters and modify the handshake response that the server has formulated.
* and the URI checking also.
*
* <p>If the developer does not override this method, no further
* modification of the request and response are made by the implementation.
*
* @param sec the configuration object involved in the handshake
* @param request the opening handshake request.
* @param response the proposed opening handshake response
*/
public void
modifyHandshake(
ServerEndpointConfig sec,
HandshakeRequest request,
HandshakeResponse response) {
// nothing.
}
/**
* This method is called by the container each time a new client
* connects to the logical endpoint this configurator configures.
* Developers may override this method to control instantiation of
* endpoint instances in order to customize the initialization
* of the endpoint instance, or manage them in some other way.
* If the developer overrides this method, services like
* dependency injection that are otherwise supported, for example, when
* the implementation is part of the Java EE platform
* may not be available.
* The platform default implementation of this method returns a new
* endpoint instance per call, thereby ensuring that there is one
* endpoint instance per client, the default deployment cardinality.
*
* @param endpointClass the class of the endpoint
* @param <T> the type of the endpoint
* @return an instance of the endpoint that will handle all
* interactions from a new client.
* @throws InstantiationException if there was an error producing the
* endpoint instance.
*/
public <T> T
getEndpointInstance(
Class<T>
endpointClass) throws
InstantiationException {
return this.
getContainerDefaultConfigurator().
getEndpointInstance(
endpointClass);
}
}
/**
* The ServerEndpointConfig.Builder is a class used for creating
* {@link ServerEndpointConfig.Builder} objects for the purposes of
* deploying a server endpoint.
*
* <p>Here are some examples:
*
* <p>Building a plain configuration for an endpoint with just a path.
* <pre><code>
* ServerEndpointConfig config = ServerEndpointConfig.Builder.create(ProgrammaticEndpoint.class, "/foo").build();
* </code></pre>
*
* <p>Building a configuration with no subprotocols and a custom configurator.
* <pre><code>
* ServerEndpointConfig config = ServerEndpointConfig.Builder.create(ProgrammaticEndpoint.class, "/bar")
* .subprotocols(subprotocols)
* .configurator(new MyServerConfigurator())
* .build();
* </code></pre>
*
* @author dannycoward
*/
public final class
Builder {
private
String path;
private
Class<?>
endpointClass;
private
List<
String>
subprotocols =
Collections.
emptyList();
private
List<
Extension>
extensions =
Collections.
emptyList();
private
List<
Class<? extends
Encoder>>
encoders =
Collections.
emptyList();
private
List<
Class<? extends
Decoder>>
decoders =
Collections.
emptyList();
private
ServerEndpointConfig.
Configurator serverEndpointConfigurator;
/**
* Creates the builder with the mandatory information of the endpoint class
* (programmatic or annotated), the relative URI or URI-template to use,
* and with no subprotocols, extensions, encoders, decoders or custom
* configurator.
* @param endpointClass the class of the endpoint to configure
* @param path The URI or URI template where the endpoint will be deployed.
* A trailing "/" will be ignored and the path must begin with /.
* @return a new instance of ServerEndpointConfig.Builder
*/
public static
Builder create(
Class<?>
endpointClass,
String path) {
return new
Builder(
endpointClass,
path);
}
// only one way to build them
private
Builder() {
}
/**
* Builds the configuration object using the current attributes
* that have been set on this builder object.
*
* @return a new ServerEndpointConfig object.
*/
public
ServerEndpointConfig build() {
return new
DefaultServerEndpointConfig(
this.
endpointClass,
this.
path,
Collections.
unmodifiableList(this.
subprotocols),
Collections.
unmodifiableList(this.
extensions),
Collections.
unmodifiableList(this.
encoders),
Collections.
unmodifiableList(this.
decoders),
this.
serverEndpointConfigurator
);
}
private
Builder(
Class endpointClass,
String path) {
if (
endpointClass == null) {
throw new
IllegalArgumentException("endpointClass cannot be null");
}
this.
endpointClass =
endpointClass;
if (
path == null || !
path.
startsWith("/")) {
throw new
IllegalStateException("Path cannot be null and must begin with /");
}
this.
path =
path;
}
/**
* Sets the list of encoder implementation classes for this builder.
*
* @param encoders the encoders
* @return this builder instance
*/
public
ServerEndpointConfig.
Builder encoders(
List<
Class<? extends
Encoder>>
encoders) {
this.
encoders = (
encoders == null) ? new
ArrayList<
Class<? extends
Encoder>>() :
encoders;
return this;
}
/**
* Sets the decoder implementation classes to use in the configuration.
*
* @param decoders the decoders
* @return this builder instance.
*/
public
ServerEndpointConfig.
Builder decoders(
List<
Class<? extends
Decoder>>
decoders) {
this.
decoders = (
decoders == null) ? new
ArrayList<
Class<? extends
Decoder>>() :
decoders;
return this;
}
/**
* Sets the subprotocols to use in the configuration.
*
* @param subprotocols the subprotocols.
* @return this builder instance
*/
public
ServerEndpointConfig.
Builder subprotocols(
List<
String>
subprotocols) {
this.
subprotocols = (
subprotocols == null) ? new
ArrayList<
String>() :
subprotocols;
return this;
}
/**
* Sets the extensions to use in the configuration.
*
* @param extensions the extensions to use.
* @return this builder instance.
*/
public
ServerEndpointConfig.
Builder extensions(
List<
Extension>
extensions) {
this.
extensions = (
extensions == null) ? new
ArrayList<
Extension>() :
extensions;
return this;
}
/**
* Sets the custom configurator to use on the configuration
* object built by this builder.
*
* @param serverEndpointConfigurator the configurator
* @return this builder instance
*/
public
ServerEndpointConfig.
Builder configurator(
ServerEndpointConfig.
Configurator serverEndpointConfigurator) {
this.
serverEndpointConfigurator =
serverEndpointConfigurator;
return this;
}
}
}