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Jakarta WebSocket - Server API
/*
* Copyright (c) 2018 Oracle and/or its affiliates and others.
* All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
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.
*
*
*
* ClientEndpointConfig customCec = ClientEndpointConfig.Builder.create()
* .preferredSubprotocols(mySubprotocols)
* .configurator(new MyClientConfigurator())
* .build();
*
*
*
*
* @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(this.preferredSubprotocols, this.extensions, this.encoders,
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;
}
}
}
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