kafka RaftMessageQueue 源码
kafka RaftMessageQueue 代码
文件路径：/raft/src/main/java/org/apache/kafka/raft/RaftMessageQueue.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.raft;
/**
* This class is used to serialize inbound requests or responses to outbound requests.
* It basically just allows us to wrap a blocking queue so that we can have a mocked
* implementation which does not depend on system time.
*
* See {@link org.apache.kafka.raft.internals.BlockingMessageQueue}.
*/
public interface RaftMessageQueue {
/**
* Block for the arrival of a new message.
*
* @param timeoutMs timeout in milliseconds to wait for a new event
* @return the event or null if either the timeout was reached or there was
* a call to {@link #wakeup()} before any events became available
*/
RaftMessage poll(long timeoutMs);
/**
* Add a new message to the queue.
*
* @param message the message to deliver
* @throws IllegalStateException if the queue cannot accept the message
*/
void add(RaftMessage message);
/**
* Check whether there are pending messages awaiting delivery.
*
* @return if there are no pending messages to deliver
*/
boolean isEmpty();
/**
* Wakeup the thread blocking in {@link #poll(long)}. This will cause
* {@link #poll(long)} to return null if no messages are available.
*/
void wakeup();
}
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