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//  Copyright (c) 1995-2019 Mort Bay Consulting Pty. Ltd.
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package org.eclipse.jetty.server;

import java.util.List;

import org.eclipse.jetty.http.BadMessageException;
import org.eclipse.jetty.http.HttpFields;
import org.eclipse.jetty.http.MetaData;
import org.eclipse.jetty.io.Connection;
import org.eclipse.jetty.io.EndPoint;

A Factory to create Connection instances for Connectors. 
 A Connection factory is responsible for instantiating and configuring a Connection instance to handle an EndPoint accepted by a Connector. 

A ConnectionFactory has a protocol name that represents the protocol of the Connections
created.  Example of protocol names include:

http
Creates a HTTP connection that can handle multiple versions of HTTP from 0.9 to 1.1
h2
Creates a HTTP/2 connection that handles the HTTP/2 protocol
SSL-XYZ
Create an SSL connection chained to a connection obtained from a connection factory
with a protocol "XYZ".
SSL-http
Create an SSL connection chained to a HTTP connection (aka https)
SSL-ALPN
Create an SSL connection chained to a ALPN connection, that uses a negotiation with
the client to determine the next protocol.

/**
 * A Factory to create {@link Connection} instances for {@link Connector}s.
 * <p>
 * A Connection factory is responsible for instantiating and configuring a {@link Connection} instance
 * to handle an {@link EndPoint} accepted by a {@link Connector}.
 * <p>
 * A ConnectionFactory has a protocol name that represents the protocol of the Connections
 * created.  Example of protocol names include:
 * <dl>
 * <dt>http</dt><dd>Creates a HTTP connection that can handle multiple versions of HTTP from 0.9 to 1.1</dd>
 * <dt>h2</dt><dd>Creates a HTTP/2 connection that handles the HTTP/2 protocol</dd>
 * <dt>SSL-XYZ</dt><dd>Create an SSL connection chained to a connection obtained from a connection factory
 * with a protocol "XYZ".</dd>
 * <dt>SSL-http</dt><dd>Create an SSL connection chained to a HTTP connection (aka https)</dd>
 * <dt>SSL-ALPN</dt><dd>Create an SSL connection chained to a ALPN connection, that uses a negotiation with
 * the client to determine the next protocol.</dd>
 * </dl>
 */
public interface ConnectionFactory
{

    
Returns:
A string representing the primary protocol name./**
     * @return A string representing the primary protocol name.
     */
    public String getProtocol();

    
Returns:
A list of alternative protocol names/versions including the primary protocol./**
     * @return A list of alternative protocol names/versions including the primary protocol.
     */
    public List<String> getProtocols();

    
Creates a new Connection with the given parameters
Params:
connector – The Connector creating this connection
endPoint – the EndPoint associated with the connection
Returns:
a new Connection/**
     * <p>Creates a new {@link Connection} with the given parameters</p>
     *
     * @param connector The {@link Connector} creating this connection
     * @param endPoint the {@link EndPoint} associated with the connection
     * @return a new {@link Connection}
     */
    public Connection newConnection(Connector connector, EndPoint endPoint);

    public interface Upgrading extends ConnectionFactory
    {

        
Create a connection for an upgrade request.
This is a variation of ConnectionFactory.newConnection(Connector, EndPoint) that can create (and/or customise) a connection for an upgrade request. Implementations may call ConnectionFactory.newConnection(Connector, EndPoint) or may construct the connection instance themselves.
Params:
connector – The connector to upgrade for.
endPoint – The endpoint of the connection.
upgradeRequest – The meta data of the upgrade request.
responseFields – The fields to be sent with the 101 response
Throws:
BadMessageException – Thrown to indicate the upgrade attempt was illegal and that a bad message response should be sent.
Returns:
Null to indicate that request processing should continue normally without upgrading. A new connection instance to
indicate that the upgrade should proceed./**
         * Create a connection for an upgrade request.
         * <p>This is a variation of {@link #newConnection(Connector, EndPoint)} that can create (and/or customise)
         * a connection for an upgrade request.  Implementations may call {@link #newConnection(Connector, EndPoint)} or
         * may construct the connection instance themselves.</p>
         *
         * @param connector The connector to upgrade for.
         * @param endPoint The endpoint of the connection.
         * @param upgradeRequest The meta data of the upgrade request.
         * @param responseFields The fields to be sent with the 101 response
         * @return Null to indicate that request processing should continue normally without upgrading. A new connection instance to
         * indicate that the upgrade should proceed.
         * @throws BadMessageException Thrown to indicate the upgrade attempt was illegal and that a bad message response should be sent.
         */
        public Connection upgradeConnection(Connector connector, EndPoint endPoint, MetaData.Request upgradeRequest, HttpFields responseFields) throws BadMessageException;
    }
}