kafka ChannelState 源码

  • 2022-10-20
  • 浏览 (520)

kafka ChannelState 代码

文件路径:/clients/src/main/java/org/apache/kafka/common/network/ChannelState.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.kafka.common.network;

import org.apache.kafka.common.errors.AuthenticationException;

/**
 * States for KafkaChannel:
 * <ul>
 *   <li>NOT_CONNECTED: Connections are created in NOT_CONNECTED state. State is updated
 *       on {@link TransportLayer#finishConnect()} when socket connection is established.
 *       PLAINTEXT channels transition from NOT_CONNECTED to READY, others transition
 *       to AUTHENTICATE. Failures in NOT_CONNECTED state typically indicate that the
 *       remote endpoint is unavailable, which may be due to misconfigured endpoints.</li>
 *   <li>AUTHENTICATE: SSL, SASL_SSL and SASL_PLAINTEXT channels are in AUTHENTICATE state during SSL and
 *       SASL handshake. Disconnections in AUTHENTICATE state may indicate that authentication failed with
 *       SSL or SASL (broker version < 1.0.0). Channels transition to READY state when authentication completes
 *       successfully.</li>
 *   <li>READY: Connected, authenticated channels are in READY state. Channels may transition from
 *       READY to EXPIRED, FAILED_SEND or LOCAL_CLOSE.</li>
 *   <li>EXPIRED: Idle connections are moved to EXPIRED state on idle timeout and the channel is closed.</li>
 *   <li>FAILED_SEND: Channels transition from READY to FAILED_SEND state if the channel is closed due
 *       to a send failure.</li>
 *   <li>AUTHENTICATION_FAILED: Channels are moved to this state if the requested SASL mechanism is not
 *       enabled in the broker or when brokers with versions 1.0.0 and above provide an error response
 *       during SASL authentication. {@link #exception()} gives the reason provided by the broker for
 *       authentication failure.</li>
 *   <li>LOCAL_CLOSE: Channels are moved to LOCAL_CLOSE state if close() is initiated locally.</li>
 * </ul>
 * If the remote endpoint closes a channel, the state of the channel reflects the state the channel
 * was in at the time of disconnection. This state may be useful to identify the reason for disconnection.
 * <p>
 * Typical transitions:
 * <ul>
 *   <li>PLAINTEXT Good path: NOT_CONNECTED => READY => LOCAL_CLOSE</li>
 *   <li>SASL/SSL Good path: NOT_CONNECTED => AUTHENTICATE => READY => LOCAL_CLOSE</li>
 *   <li>Bootstrap server misconfiguration: NOT_CONNECTED, disconnected in NOT_CONNECTED state</li>
 *   <li>Security misconfiguration: NOT_CONNECTED => AUTHENTICATE => AUTHENTICATION_FAILED, disconnected in AUTHENTICATION_FAILED state</li>
 *   <li>Security misconfiguration with older broker: NOT_CONNECTED => AUTHENTICATE, disconnected in AUTHENTICATE state</li>
 * </ul>
 */
public class ChannelState {
    public enum State {
        NOT_CONNECTED,
        AUTHENTICATE,
        READY,
        EXPIRED,
        FAILED_SEND,
        AUTHENTICATION_FAILED,
        LOCAL_CLOSE
    }

    // AUTHENTICATION_FAILED has a custom exception. For other states,
    // create a reusable `ChannelState` instance per-state.
    public static final ChannelState NOT_CONNECTED = new ChannelState(State.NOT_CONNECTED);
    public static final ChannelState AUTHENTICATE = new ChannelState(State.AUTHENTICATE);
    public static final ChannelState READY = new ChannelState(State.READY);
    public static final ChannelState EXPIRED = new ChannelState(State.EXPIRED);
    public static final ChannelState FAILED_SEND = new ChannelState(State.FAILED_SEND);
    public static final ChannelState LOCAL_CLOSE = new ChannelState(State.LOCAL_CLOSE);

    private final State state;
    private final AuthenticationException exception;
    private final String remoteAddress;

    public ChannelState(State state) {
        this(state, null, null);
    }

    public ChannelState(State state, String remoteAddress) {
        this(state, null, remoteAddress);
    }
    
    public ChannelState(State state, AuthenticationException exception, String remoteAddress) {
        this.state = state;
        this.exception = exception;
        this.remoteAddress = remoteAddress;
    }

    public State state() {
        return state;
    }

    public AuthenticationException exception() {
        return exception;
    }

    public String remoteAddress() {
        return remoteAddress;
    }
}

相关信息

kafka 源码目录

相关文章

kafka Authenticator 源码

kafka ByteBufferSend 源码

kafka ChannelBuilder 源码

kafka ChannelBuilders 源码

kafka ChannelMetadataRegistry 源码

kafka CipherInformation 源码

kafka ClientInformation 源码

kafka DefaultChannelMetadataRegistry 源码

kafka DelayedResponseAuthenticationException 源码

kafka InvalidReceiveException 源码

0  赞