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package javax.websocket;
import java.util.
ArrayList;
import java.util.
Collections;
import java.util.
List;
import java.util.
Map;
/**
* The ClientEndpointConfig is a special kind of endpoint configuration object that contains
* web socket configuration information specific only to client endpoints. Developers deploying
* programmatic client endpoints can create instances of this configuration by
* using a {@link ClientEndpointConfig.Builder}. Developers can override some
* of the configuration operations by providing an implementation of
* {@link ClientEndpointConfig.Configurator}.
*
* @author dannycoward
*/
public interface
ClientEndpointConfig extends
EndpointConfig {
/**
* Return the ordered list of sub protocols a client endpoint would like to use,
* in order of preference, favorite first that this client would
* like to use for its sessions.
* This list is used to generate the Sec-WebSocket-Protocol header in the opening
* handshake for clients using this configuration. The first protocol name is the most preferred.
* See <a href="http://tools.ietf.org/html/rfc6455#section-4.1">Client Opening Handshake</a>.
*
* @return the list of the preferred subprotocols, the empty list if there are none
*/
List<
String>
getPreferredSubprotocols();
/**
* Return the extensions, in order of preference, favorite first, that this client would
* like to use for its sessions. These are the extensions that will
* be used to populate the Sec-WebSocket-Extensions header in the opening handshake for clients
* using this configuration. The first extension in the list is the most preferred extension.
* See <a href="http://tools.ietf.org/html/rfc6455#section-9.1">Negotiating Extensions</a>.
*
* @return the list of extensions, the empty list if there are none.
*/
List<
Extension>
getExtensions();
/**
* Return the custom configurator for this configuration. If the developer
* did not provide one, the platform default configurator is returned.
*
* @return the configurator in use with this configuration.
*/
public
ClientEndpointConfig.
Configurator getConfigurator();
/**
* The 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.
*/
public class
Configurator {
/**
* This method is called by the implementation after it has formulated the handshake
* request that will be used to initiate the connection to the server, but before it has
* sent any part of the request. This allows the developer to inspect and modify the
* handshake request headers prior to the start of the handshake interaction.
*
* @param headers the mutable map of handshake request headers the implementation is about to send to
* start the handshake interaction.
*/
public void
beforeRequest(
Map<
String,
List<
String>>
headers) {
}
/**
* This method is called by the implementation after it has received a handshake response
* from the server as a result of a handshake interaction it initiated. The developer may implement
* this method in order to inspect the returning handshake response.
*
* @param hr the handshake response sent by the server.
*/
public void
afterResponse(
HandshakeResponse hr) {
}
}
/**
* The ClientEndpointConfig.Builder is a class used for creating
* {@link ClientEndpointConfig} objects for the purposes of
* deploying a client endpoint.
* Here are some examples:
* Building a plain configuration with no encoders, decoders, subprotocols or extensions.
* <code>
* ClientEndpointConfig cec = ClientEndpointConfig.Builder.create().build();
* </code>
*
* Building a configuration with no subprotocols and a custom configurator.
* <pre><code>
* ClientEndpointConfig customCec = ClientEndpointConfig.Builder.create()
* .preferredSubprotocols(mySubprotocols)
* .configurator(new MyClientConfigurator())
* .build();
* </code></pre>
*
*
* @author dannycoward
*/
public final class
Builder {
private
List<
String>
preferredSubprotocols =
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
ClientEndpointConfig.
Configurator clientEndpointConfigurator = new
ClientEndpointConfig.
Configurator() {
};
// use create()
private
Builder() {
}
/**
* Creates a new builder object with no subprotocols, extensions, encoders,
* decoders and a {@code null} configurator.
*
* @return a new builder object.
*/
public static
ClientEndpointConfig.
Builder create() {
return new
ClientEndpointConfig.
Builder();
}
/**
* Builds a configuration object using the attributes set
* on this builder.
*
* @return a new configuration object.
*/
public
ClientEndpointConfig build() {
return new
DefaultClientEndpointConfig(
Collections.
unmodifiableList(this.
preferredSubprotocols),
Collections.
unmodifiableList(this.
extensions),
Collections.
unmodifiableList(this.
encoders),
Collections.
unmodifiableList(this.
decoders),
this.
clientEndpointConfigurator);
}
/**
* Sets the configurator object for the configuration this builder will build.
*
* @param clientEndpointConfigurator the configurator
* @return the builder instance
*/
public
ClientEndpointConfig.
Builder configurator(
ClientEndpointConfig.
Configurator clientEndpointConfigurator) {
this.
clientEndpointConfigurator =
clientEndpointConfigurator;
return this;
}
/**
* Set the preferred sub protocols for the configuration this builder will build. The
* list is treated in order of preference, favorite first, that this client would
* like to use for its sessions.
*
* @param preferredSubprotocols the preferred subprotocol names.
* @return the builder instance
*/
public
ClientEndpointConfig.
Builder preferredSubprotocols(
List<
String>
preferredSubprotocols) {
this.
preferredSubprotocols = (
preferredSubprotocols == null) ? new
ArrayList<
String>() :
preferredSubprotocols;
return this;
}
/**
* Set the extensions for the configuration this builder will build. The
* list is treated in order of preference, favorite first, that the
* client would like to use for its sessions.
*
* @param extensions the extensions
* @return the builder instance
*/
public
ClientEndpointConfig.
Builder extensions(
List<
Extension>
extensions) {
this.
extensions = (
extensions == null) ? new
ArrayList<
Extension>() :
extensions;
return this;
}
/**
* Assign the list of encoder implementation classes the client will use.
*
* @param encoders the encoder implementation classes
* @return the builder instance
*/
public
ClientEndpointConfig.
Builder encoders(
List<
Class<? extends
Encoder>>
encoders) {
this.
encoders = (
encoders == null) ? new
ArrayList<
Class<? extends
Encoder>>() :
encoders;
return this;
}
/**
* Assign the list of decoder implementation classes the client will use.
*
* @param decoders the decoder implementation classes
* @return this builder instance
*/
public
ClientEndpointConfig.
Builder decoders(
List<
Class<? extends
Decoder>>
decoders) {
this.
decoders = (
decoders == null) ? new
ArrayList<
Class<? extends
Decoder>>() :
decoders;
return this;
}
}
}