/*

 * Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 */

package jdk.incubator.http;

import java.io.IOException;

import java.net.InetSocketAddress;

import java.nio.ByteBuffer;

import java.util.concurrent.CompletableFuture;

import javax.net.ssl.SSLEngine;

import jdk.incubator.http.internal.common.ExceptionallyCloseable;

/**

 * Asynchronous version of SSLConnection.

 *

 * There are two concrete implementations of this class: AsyncSSLConnection

 * and AsyncSSLTunnelConnection.

 * This abstraction is useful when downgrading from HTTP/2 to HTTP/1.1 over

 * an SSL connection. See ExchangeImpl::get in the case where an ALPNException

 * is thrown.

 *

 * Note: An AsyncSSLConnection wraps a PlainHttpConnection, while an

 *       AsyncSSLTunnelConnection wraps a PlainTunnelingConnection.

 *       If both these wrapped classes where made to inherit from a

 *       common abstraction then it might be possible to merge

 *       AsyncSSLConnection and AsyncSSLTunnelConnection back into

 *       a single class - and simply use different factory methods to

 *       create different wrappees, but this is left up for further cleanup.

 *

 */

abstract class AbstractAsyncSSLConnection extends HttpConnection

               implements AsyncConnection, ExceptionallyCloseable {

    AbstractAsyncSSLConnection(InetSocketAddress addr, HttpClientImpl client) {

        super(addr, client);

    }

    abstract SSLEngine getEngine();

    abstract AsyncSSLDelegate sslDelegate();

    abstract HttpConnection plainConnection();

    abstract HttpConnection downgrade();

    @Override

    final boolean isSecure() {

        return true;

    }

    // Blocking read functions not used here

    @Override

    protected final ByteBuffer readImpl() throws IOException {

        throw new UnsupportedOperationException("Not supported.");

    }

    // whenReceivedResponse only used in HTTP/1.1 (Http1Exchange)

    // AbstractAsyncSSLConnection is only used with HTTP/2

    @Override

    final CompletableFuture<Void> whenReceivingResponse() {

        throw new UnsupportedOperationException("Not supported.");

    }

}