小编use*_*845的帖子

什么是ByteBuf中的Pooled vs Unpooled和Direct vs Heap之间的区别？

就像,pooled在接收到的消息的上下文中意味着什么,因为像HttpRequest这样的对象是从HttpRequestDecoder之一的ByteBuf创建的,然后在管道的最后一个处理程序中释放？在这种情况下,汇集内存是什么？对于池化和未池化,内存管理将如何不同？

如果通道在超时毫秒内没有收到读/响应,SO_TIMEOUT是否会使非阻塞通道失效？

bootstrap.group(workerGroup).channel(NioSocketChannel.class).
.handler(channelInitializer).option(ChannelOption.SO_TIMEOUT, 100);

此外,该选项是否也适用于服务器频道？喜欢:

serverBootstrap.group(bossGroup, workerGroup).channel(NioServerSocketChannel.class).
localAddress(new InetSocketAddress(8800)).childHandler(serverChannelInitializer).
option(ChannelOption.SO_TIMEOUT, 100).bind().sync();

我想NOW()从另一个表中减去分钟和“多少分钟”的值：

SELECT * FROM A, B 
WHERE 
   A.entity_type_id = B.entity_type_id  
   AND A.status = 'PENDING'  
   AND A.request_time < (NOW() - INTERVAL B.retry_interval MINUTE) 
   AND A.retry_count >= B.retry_allowed_count

这里的问题是B.retry_interval从另一个表中获取的，而通常这样的查询是A.request_time < (NOW() - INTERVAL '10 MINUTE')

我如何实现这一目标？

使用lombok 1.16.6版本的lombok。从命令行构建（MVN全新安装）时，出现此错误：

java.lang.ClassNotFoundException: lombok.javac.handlers.HandleHelper
[ERROR] at lombok.core.SpiLoadUtil$1$1.next(SpiLoadUtil.java:114)
[ERROR] at     lombok.javac.HandlerLibrary.loadAnnotationHandlers(HandlerLibrary.java:170)
[ERROR] at lombok.javac.HandlerLibrary.load(HandlerLibrary.java:155)
[ERROR] at lombok.javac.JavacTransformer.<init>(JavacTransformer.java:43)
[ERROR] at lombok.javac.apt.Processor.init(Processor.java:86)
[ERROR] at lombok.core.AnnotationProcessor$JavacDescriptor.want(AnnotationProcessor.java:87)
[ERROR] at lombok.core.AnnotationProcessor.init(AnnotationProcessor.java:141)
[ERROR] at lombok.launch.AnnotationProcessorHider$AnnotationProcessor.init(AnnotationProcessor.java:53)
[ERROR] at com.sun.tools.javac.processing.JavacProcessingEnvironment$ProcessorState.<init>(JavacProcessingEnvironment.java:500)
[ERROR] at com.sun.tools.javac.processing.JavacProcessingEnvironment$DiscoveredProcessors$ProcessorStateIterator.next(JavacProcessingEnvironment.java:597)
[ERROR] at com.sun.tools.javac.processing.JavacProcessingEnvironment.discoverAndRunProcs(JavacProcessingEnvironment.java:690)
[ERROR] at com.sun.tools.javac.processing.JavacProcessingEnvironment.access$1800(JavacProcessingEnvironment.java:91)
[ERROR] at com.sun.tools.javac.processing.JavacProcessingEnvironment$Round.run(JavacProcessingEnvironment.java:1035)
[ERROR] at com.sun.tools.javac.processing.JavacProcessingEnvironment.doProcessing(JavacProcessingEnvironment.java:1176)
[ERROR] at com.sun.tools.javac.main.JavaCompiler.processAnnotations(JavaCompiler.java:1170)
[ERROR] at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:856)
[ERROR] at com.sun.tools.javac.main.Main.compile(Main.java:523)
[ERROR] at com.sun.tools.javac.main.Main.compile(Main.java:381)
[ERROR] at com.sun.tools.javac.main.Main.compile(Main.java:370)
[ERROR] at com.sun.tools.javac.main.Main.compile(Main.java:361)
[ERROR] at com.sun.tools.javac.Main.compile(Main.java:56)
[ERROR] at com.sun.tools.javac.Main.main(Main.java:42)
[ERROR] Caused by: java.lang.ClassNotFoundException: lombok.javac.handlers.HandleHelper
[ERROR] at java.lang.ClassLoader.findClass(ClassLoader.java:530)
[ERROR] at …