org.apache.nifi.distributed.cache.client

Class CacheClientRequestHandler

java.lang.Object

io.netty.channel.ChannelHandlerAdapter

io.netty.channel.ChannelInboundHandlerAdapter

org.apache.nifi.distributed.cache.client.CacheClientRequestHandler

All Implemented Interfaces:

io.netty.channel.ChannelHandler, io.netty.channel.ChannelInboundHandler

public class CacheClientRequestHandler
extends io.netty.channel.ChannelInboundHandlerAdapter

The ChannelHandler responsible for sending client requests and receiving server responses in the context of a distributed cache server.

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 and Description
private io.netty.channel.ChannelPromise	channelPromise The synchronization construct used to signal the client application that the server response has been received.
private InboundAdapter	inboundAdapter The object used to buffer and interpret the service response byte stream.

Constructor Summary

Constructors

Constructor and Description
CacheClientRequestHandler()

Method Summary

Modifier and Type	Method and Description
void	channelRead(io.netty.channel.ChannelHandlerContext ctx, Object msg)
void	channelReadComplete(io.netty.channel.ChannelHandlerContext ctx)
void	channelUnregistered(io.netty.channel.ChannelHandlerContext ctx)
void	exceptionCaught(io.netty.channel.ChannelHandlerContext ctx, Throwable cause)
void	invoke(io.netty.channel.Channel channel, OutboundAdapter outboundAdapter, InboundAdapter inboundAdapter) Perform a synchronous method call to the server.

Methods inherited from class io.netty.channel.ChannelInboundHandlerAdapter

channelActive, channelInactive, channelRegistered, channelWritabilityChanged, 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

inboundAdapter

private InboundAdapter inboundAdapter

The object used to buffer and interpret the service response byte stream.

channelPromise

private io.netty.channel.ChannelPromise channelPromise

The synchronization construct used to signal the client application that the server response has been received.

Constructor Detail

CacheClientRequestHandler

public CacheClientRequestHandler()

Method Detail

channelRead

public void channelRead(io.netty.channel.ChannelHandlerContext ctx,
                        Object msg)

Specified by:

channelRead in interface io.netty.channel.ChannelInboundHandler

Overrides:

channelRead in class io.netty.channel.ChannelInboundHandlerAdapter

channelReadComplete

public void channelReadComplete(io.netty.channel.ChannelHandlerContext ctx)
                         throws IOException

Specified by:

channelReadComplete in interface io.netty.channel.ChannelInboundHandler

Overrides:

channelReadComplete in class io.netty.channel.ChannelInboundHandlerAdapter

Throws:

IOException

channelUnregistered

public void channelUnregistered(io.netty.channel.ChannelHandlerContext ctx)

Specified by:

channelUnregistered in interface io.netty.channel.ChannelInboundHandler

Overrides:

channelUnregistered in class io.netty.channel.ChannelInboundHandlerAdapter

exceptionCaught

public void exceptionCaught(io.netty.channel.ChannelHandlerContext ctx,
                            Throwable cause)

Specified by:

exceptionCaught in interface io.netty.channel.ChannelHandler

Specified by:

exceptionCaught in interface io.netty.channel.ChannelInboundHandler

Overrides:

exceptionCaught in class io.netty.channel.ChannelInboundHandlerAdapter

invoke

public void invoke(io.netty.channel.Channel channel,
                   OutboundAdapter outboundAdapter,
                   InboundAdapter inboundAdapter)
            throws IOException

Perform a synchronous method call to the server. The server is expected to write a byte stream response to the channel, which may be deserialized into a Java object by the caller. The receipt of data outside the context of a call to this method is unexpected; the data is dropped.

Parameters:

channel - the network channel used to make the request

outboundAdapter - the request payload, which might be a method name, and [0..n] concatenated arguments

inboundAdapter - the business logic to deserialize the server response

Throws:

IOException