Package com.linkedin.alpini.netty4.handlers

Class ElideDuplicateHeadersHandler

  • All Implemented Interfaces:
    io.netty.channel.ChannelHandler, io.netty.channel.ChannelInboundHandler, io.netty.channel.ChannelOutboundHandler
    @Sharable
public class ElideDuplicateHeadersHandler
extends io.netty.channel.ChannelDuplexHandler
    A simple cache to reduce the number of duplicate CharSequences held by the HttpHeaders instances. The reason is that the HttpObjectDecoder will instantiate a new String for every part of the header that it encountered we want to facilitate the garbage collector in reaping short life objects. The implementation uses a queue of maps per thread instead of maintaining a LRU structure where initially two maps are added to the queue and at each expire interval, a new empty map is added at the start and an old map is removed from the end. This effectively makes the lifetime of every map to be 2x the expire interval and entries referenced would be inserted into only the map at the head of the queue.

    • Nested Class Summary

      • Nested classes/interfaces inherited from interface io.netty.channel.ChannelHandler

        io.netty.channel.ChannelHandler.Sharable

    • Field Summary

      Fields 
      Modifier and Type Field Description
      static io.netty.channel.ChannelDuplexHandler INSTANCE  

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      void channelRead​(io.netty.channel.ChannelHandlerContext ctx, java.lang.Object msg)  
      void write​(io.netty.channel.ChannelHandlerContext ctx, java.lang.Object msg, io.netty.channel.ChannelPromise promise)  

      • Methods inherited from class io.netty.channel.ChannelDuplexHandler

        bind, close, connect, deregister, disconnect, flush, read

      • Methods inherited from class io.netty.channel.ChannelInboundHandlerAdapter

        channelActive, channelInactive, channelReadComplete, channelRegistered, channelUnregistered, channelWritabilityChanged, exceptionCaught, userEventTriggered

      • Methods inherited from class io.netty.channel.ChannelHandlerAdapter

        ensureNotSharable, handlerAdded, handlerRemoved, isSharable

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

      • Methods inherited from interface io.netty.channel.ChannelHandler

        handlerAdded, handlerRemoved

    • Field Detail

      • INSTANCE

        public static final io.netty.channel.ChannelDuplexHandler INSTANCE

    • Method Detail

      • write

        public void write​(io.netty.channel.ChannelHandlerContext ctx,
                  java.lang.Object msg,
                  io.netty.channel.ChannelPromise promise)
           throws java.lang.Exception
        Specified by:
        write in interface io.netty.channel.ChannelOutboundHandler
        Overrides:
        write in class io.netty.channel.ChannelDuplexHandler
        Throws:
        java.lang.Exception

      • channelRead

        public void channelRead​(io.netty.channel.ChannelHandlerContext ctx,
                        java.lang.Object msg)
                 throws java.lang.Exception
        Specified by:
        channelRead in interface io.netty.channel.ChannelInboundHandler
        Overrides:
        channelRead in class io.netty.channel.ChannelInboundHandlerAdapter
        Throws:
        java.lang.Exception