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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 Client Opening Handshake.
*
* @return the list of the preferred subprotocols, the empty list if there are none
*/
List 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 Negotiating Extensions.
*
* @return the list of extensions, the empty list if there are none.
*/
List 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> 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.
*
* ClientEndpointConfig cec = ClientEndpointConfig.Builder.create().build();
*
*
* Building a configuration with no subprotocols and a custom configurator.
*
*
*
* @author dannycoward
*/
public final class Builder {
private List preferredSubprotocols = Collections.emptyList();
private List extensions = Collections.emptyList();
private List> encoders = Collections.emptyList();
private List> 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 preferredSubprotocols) {
this.preferredSubprotocols = (preferredSubprotocols == null) ? new ArrayList() : 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 extensions) {
this.extensions = (extensions == null) ? new ArrayList() : 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> encoders) {
this.encoders = (encoders == null) ? new ArrayList>() : 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> decoders) {
this.decoders = (decoders == null) ? new ArrayList>() : decoders;
return this;
}
}
}
