Package org.apache.flink.queryablestate.server

Class KvStateServerHandler

java.lang.Object
org.apache.flink.shaded.netty4.io.netty.channel.ChannelHandlerAdapter
org.apache.flink.shaded.netty4.io.netty.channel.ChannelInboundHandlerAdapter
org.apache.flink.queryablestate.network.AbstractServerHandler<KvStateInternalRequest,org.apache.flink.queryablestate.messages.KvStateResponse>
org.apache.flink.queryablestate.server.KvStateServerHandler
All Implemented Interfaces:
org.apache.flink.shaded.netty4.io.netty.channel.ChannelHandler, org.apache.flink.shaded.netty4.io.netty.channel.ChannelInboundHandler
@Internal @Sharable public class KvStateServerHandler extends org.apache.flink.queryablestate.network.AbstractServerHandler<KvStateInternalRequest,org.apache.flink.queryablestate.messages.KvStateResponse>
This handler dispatches asynchronous tasks, which query InternalKvState instances and write the result to the channel.

The network threads receive the message, deserialize it and dispatch the query task. The actual query is handled in a separate thread as it might otherwise block the network threads (file I/O etc.).

  • Nested Class Summary

    Nested classes/interfaces inherited from interface org.apache.flink.shaded.netty4.io.netty.channel.ChannelHandler

    org.apache.flink.shaded.netty4.io.netty.channel.ChannelHandler.Sharable

  • Field Summary

    Fields inherited from class org.apache.flink.queryablestate.network.AbstractServerHandler

    queryExecutor

  • Constructor Summary

    Constructors
    Constructor
    Description
    KvStateServerHandler(KvStateServerImpl server, org.apache.flink.runtime.query.KvStateRegistry kvStateRegistry, org.apache.flink.queryablestate.network.messages.MessageSerializer<KvStateInternalRequest,org.apache.flink.queryablestate.messages.KvStateResponse> serializer, org.apache.flink.queryablestate.network.stats.KvStateRequestStats stats)
    Create the handler used by the KvStateServerImpl.

  • Method Summary

    Modifier and Type
    Method
    Description
    CompletableFuture<org.apache.flink.queryablestate.messages.KvStateResponse>
    handleRequest(long requestId, KvStateInternalRequest request)
     
    CompletableFuture<Void>
    shutdown()
     

    Methods inherited from class org.apache.flink.queryablestate.network.AbstractServerHandler

    channelActive, channelInactive, channelRead, exceptionCaught, getServerName

    Methods inherited from class org.apache.flink.shaded.netty4.io.netty.channel.ChannelInboundHandlerAdapter

    channelReadComplete, channelRegistered, channelUnregistered, channelWritabilityChanged, userEventTriggered

    Methods inherited from class org.apache.flink.shaded.netty4.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 org.apache.flink.shaded.netty4.io.netty.channel.ChannelHandler

    handlerAdded, handlerRemoved

  • Constructor Details

    • KvStateServerHandler

      public KvStateServerHandler(KvStateServerImpl server, org.apache.flink.runtime.query.KvStateRegistry kvStateRegistry, org.apache.flink.queryablestate.network.messages.MessageSerializer<KvStateInternalRequest,org.apache.flink.queryablestate.messages.KvStateResponse> serializer, org.apache.flink.queryablestate.network.stats.KvStateRequestStats stats)
      Create the handler used by the KvStateServerImpl.
      Parameters:
      server - the KvStateServerImpl using the handler.
      kvStateRegistry - registry to query.
      serializer - the MessageSerializer used to (de-) serialize the different messages.
      stats - server statistics collector.

  • Method Details

    • handleRequest

      public CompletableFuture<org.apache.flink.queryablestate.messages.KvStateResponse> handleRequest(long requestId, KvStateInternalRequest request)
      Specified by:
      handleRequest in class org.apache.flink.queryablestate.network.AbstractServerHandler<KvStateInternalRequest,org.apache.flink.queryablestate.messages.KvStateResponse>

    • shutdown

      public CompletableFuture<Void> shutdown()
      Specified by:
      shutdown in class org.apache.flink.queryablestate.network.AbstractServerHandler<KvStateInternalRequest,org.apache.flink.queryablestate.messages.KvStateResponse>