kafka LogReplayTracker 源码
kafka LogReplayTracker 代码
文件路径：/metadata/src/main/java/org/apache/kafka/controller/LogReplayTracker.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.controller;
import org.apache.kafka.common.protocol.ApiMessage;
import org.apache.kafka.common.utils.LogContext;
import org.slf4j.Logger;
/**
* The LogReplayTracker manages state associated with replaying the metadata log, such as whether
* we have seen any records and whether we have seen any metadata version records. It is accessed
* solely from the quorum controller thread.
*/
public class LogReplayTracker {
public static class Builder {
private LogContext logContext = null;
Builder setLogContext(LogContext logContext) {
this.logContext = logContext;
return this;
}
public LogReplayTracker build() {
if (logContext == null) logContext = new LogContext();
return new LogReplayTracker(logContext);
}
}
/**
* The slf4j logger.
*/
private final Logger log;
/**
* True if we haven't replayed any records yet.
*/
private boolean empty;
private LogReplayTracker(
LogContext logContext
) {
this.log = logContext.logger(LogReplayTracker.class);
resetToEmpty();
}
void resetToEmpty() {
this.empty = true;
}
boolean empty() {
return empty;
}
void replay(ApiMessage message) {
empty = false;
}
}
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