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深入浅出Disruptor3.x:高效Java队列使用详解

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Disruptor是LMAX公司开发的一款高性能的事件队列库,它是为了解决在高并发环境下,数据在不同组件之间高速、安全地传递问题而设计的。在金融行业等需要极低延迟的场景下,Disruptor得到了广泛的应用。Disruptor的实现基于无锁、环形缓冲区的设计理念,这使得它在性能上相比传统的阻塞队列有极大的优势。 ### Disruptor核心概念 #### RingBuffer(环形缓冲区) RingBuffer是Disruptor的核心数据结构,它是事件生产者发布事件的地点,也是消费者消费事件的地方。RingBuffer可以看作是一个固定大小的数组,其内部通过序列号来追踪下一个可用的插槽位置。生产者和消费者之间的交互无需等待或锁机制,大大提升了效率。 #### Sequence(序列) 序列是Disruptor中用于追踪事件位置的简单计数器。在Disruptor中,每个生产者和消费者都有自己的序列,用于跟踪它们在RingBuffer中的位置。序列号的类型通常是`long`,因为它能够提供足够的范围来表示大量事件。 #### Sequencer(序列器) Sequencer是Disruptor的主要接口,负责处理RingBuffer中的序列号的分配和管理。Disruptor提供了两种类型的Sequencer实现:单生产者Sequencer和多生产者Sequencer。它们分别用于处理只有一个生产者和有多个生产者的情况。 #### Event 在Disruptor中,事件是被传递的数据单位,它被发布到RingBuffer中供消费者处理。你可以将Event理解为消息或者业务数据的封装。 #### EventHandler(事件处理器) EventHandler接口定义了事件的处理逻辑,消费者需要实现这个接口来接收和处理事件。Disruptor允许你将多个EventHandler组合在一起,形成一个事件处理链。 #### Producer(生产者) 生产者是将数据放入RingBuffer的组件。它们通常会通过事件发布API来发布事件,可以有单个生产者或多生产者。 ### Disruptor3.x 使用方式 在Disruptor3.x版本中,使用方式相较于早期版本有所变化,以下是一些关键步骤: 1. **定义事件(Event)类**: - 首先需要定义一个Event类,它将被放入RingBuffer。这个类可以根据你的业务需求来设计。 2. **创建事件工厂(EventFactory)**: - EventFactory负责创建RingBuffer中事件的实例。它必须实现EventFactory接口。 3. **构建Disruptor实例**: - 使用Disruptor的Builder模式来配置和创建Disruptor实例。这包括指定RingBuffer的大小、事件工厂以及消费者。 4. **定义事件处理器(EventHandler)**: - 实现EventHandler接口来定义事件的处理逻辑。 5. **启动Disruptor**: - 在所有配置完成后,通过Disruptor实例的start方法来启动Disruptor。 6. **发布事件**: - 生产者通过Disruptor实例的publish方法来发布事件到RingBuffer。 ### 示例代码解析 在给出的示例代码中,首先创建了一个EventHandler数组,然后实例化了DisruptorPublisher,并将事件处理器作为参数传递给它。DisruptorPublisher是一个包装了Disruptor实例的类,它提供了start方法来启动Disruptor和publish方法来发布事件。 代码中的for循环是一个生产者发布事件的逻辑,它无限循环地创建CDO对象,并将其包装在EventData中,然后通过DisruptorPublisher发布到RingBuffer。 ### 注意事项 - 在使用Disruptor时,通常推荐预先分配固定大小的RingBuffer,这样可以避免运行时动态扩容的开销。 - RingBuffer的大小最好是2的幂次方,这样序列号的计算可以利用位运算来加快速度。 - Disruptor能够支持高并发的关键在于无锁设计,因此在编写事件处理器的逻辑时应避免使用锁。 ### 结语 Disruptor作为一个高性能的序列化事件处理框架,通过无锁设计、环形缓冲区等创新技术,大幅提升了数据处理速度,特别适合于需要极高性能和确定性的场合。掌握Disruptor的使用对于进行高性能数据处理的开发者来说,是非常有价值的一项技能。

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repository\org\apache\hadoop\hadoop-distcp\2.8.5\hadoop-distcp-2.8.5.jar;D:\maven\local repository\org\apache\hbase\hbase-replication\2.2.4\hbase-replication-2.2.4.jar;D:\maven\local repository\org\apache\hadoop\hadoop-hdfs\2.8.5\hadoop-hdfs-2.8.5.jar;D:\maven\local repository\org\apache\hadoop\hadoop-hdfs-client\2.8.5\hadoop-hdfs-client-2.8.5.jar;D:\maven\local repository\com\squareup\okhttp\okhttp\2.4.0\okhttp-2.4.0.jar;D:\maven\local repository\com\squareup\okio\okio\1.4.0\okio-1.4.0.jar;D:\maven\local repository\commons-daemon\commons-daemon\1.0.13\commons-daemon-1.0.13.jar;D:\maven\local repository\io\netty\netty-all\4.0.23.Final\netty-all-4.0.23.Final.jar;D:\maven\local repository\org\fusesource\leveldbjni\leveldbjni-all\1.8\leveldbjni-all-1.8.jar;D:\maven\local repository\org\apache\hadoop\hadoop-mapreduce-client-core\2.8.5\hadoop-mapreduce-client-core-2.8.5.jar;D:\maven\local repository\org\apache\hadoop\hadoop-yarn-common\2.8.5\hadoop-yarn-common-2.8.5.jar;D:\maven\local repository\org\apache\hadoop\hadoop-yarn-api\2.8.5\hadoop-yarn-api-2.8.5.jar;D:\maven\local repository\com\sun\jersey\jersey-client\1.9\jersey-client-1.9.jar;D:\maven\local repository\com\google\inject\guice\3.0\guice-3.0.jar;D:\maven\local repository\javax\inject\javax.inject\1\javax.inject-1.jar;D:\maven\local repository\aopalliance\aopalliance\1.0\aopalliance-1.0.jar;D:\maven\local repository\com\sun\jersey\contribs\jersey-guice\1.9\jersey-guice-1.9.jar;D:\maven\local repository\com\google\inject\extensions\guice-servlet\3.0\guice-servlet-3.0.jar;D:\maven\local repository\io\netty\netty\3.6.2.Final\netty-3.6.2.Final.jar" org.example.Mapreduce.BrandAmount log4j:WARN No appenders could be found for logger (org.apache.hadoop.metrics2.lib.MutableMetricsFactory). log4j:WARN Please initialize the log4j system properly. log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info. Exception in thread "main" java.io.IOException: Cannot initialize Cluster. Please check your configuration for mapreduce.framework.name and the correspond server addresses. at org.apache.hadoop.mapreduce.Cluster.initialize(Cluster.java:143) at org.apache.hadoop.mapreduce.Cluster.<init>(Cluster.java:108) at org.apache.hadoop.mapreduce.Cluster.<init>(Cluster.java:101) at org.apache.hadoop.mapreduce.Job$10.run(Job.java:1311) at org.apache.hadoop.mapreduce.Job$10.run(Job.java:1307) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAs(Subject.java:422) at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1844) at org.apache.hadoop.mapreduce.Job.connect(Job.java:1306) at org.apache.hadoop.mapreduce.Job.submit(Job.java:1335) at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:1359) at org.example.Mapreduce.BrandAmount.main(BrandAmount.java:68) Process finished with exit code 1

资源评论
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覃宇辉
2025.08.18
对于初学者来说,是理解Disruptor队列概念的良好起点。
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稚气筱筱
2025.06.16
这篇文档是关于Disruptor 3.x版本的使用方法,介绍了如何创建事件处理器、发布者,并通过一个循环例子展示数据发布过程。适合对Disruptor和Java高性能队列感兴趣的开发者阅读。
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XiZi
2025.03.06
文档内容简洁,通过实例代码快速展示了Disruptor的基本用法。
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