001/*
002 * Copyright 2022-2026 Revetware LLC.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package com.soklet;
018
019/**
020 * Reasons a connection attempt was rejected by a transport server before request handling could begin.
021 * <p>
022 * This type is currently used by both Soklet's regular {@link HttpServer} transport and its {@link SseServer}
023 * transport via lifecycle and metrics callbacks such as
024 * {@link LifecycleObserver#didFailToAcceptConnection(ServerType, java.net.InetSocketAddress, ConnectionRejectionReason, Throwable)}
025 * and
026 * {@link MetricsCollector#didFailToAcceptConnection(ServerType, java.net.InetSocketAddress, ConnectionRejectionReason, Throwable)}.
027 *
028 * @author <a href="https://www.revetkn.com">Mark Allen</a>
029 */
030public enum ConnectionRejectionReason {
031        /**
032         * The server rejected the connection because a connection limit was reached.
033         */
034        MAX_CONNECTIONS,
035        /**
036         * The initial request read timed out before a full request could be parsed.
037         */
038        REQUEST_READ_TIMEOUT,
039        /**
040         * The incoming request could not be parsed into a valid HTTP request.
041         */
042        UNPARSEABLE_REQUEST,
043        /**
044         * An unexpected internal error occurred while handling the connection.
045         */
046        INTERNAL_ERROR
047}