alluxio.worker.netty

Class BlockReadHandler

java.lang.Object

io.netty.channel.ChannelHandlerAdapter

io.netty.channel.ChannelInboundHandlerAdapter

alluxio.worker.netty.BlockReadHandler

All Implemented Interfaces:

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

@NotThreadSafe
public final class BlockReadHandler
extends io.netty.channel.ChannelInboundHandlerAdapter

This handler handles block read request. Check more information in AbstractReadHandler.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
class	BlockReadHandler.BlockPacketReader The packet reader to read from a local block worker.

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

io.netty.channel.ChannelHandler.Sharable

Constructor Summary

Constructors

Constructor and Description
BlockReadHandler(ExecutorService executorService, BlockWorker blockWorker, alluxio.worker.netty.FileTransferType fileTransferType) Creates an instance of AbstractReadHandler.

Method Summary

Modifier and Type	Method and Description
protected boolean	acceptMessage(Object object) Checks whether this object should be processed by this handler.
void	channelRead(io.netty.channel.ChannelHandlerContext ctx, Object object)
void	channelUnregistered(io.netty.channel.ChannelHandlerContext ctx)
protected alluxio.worker.netty.AbstractReadHandler.PacketReader	createPacketReader(BlockReadRequestContext context, io.netty.channel.Channel channel) Creates a read reader.
protected BlockReadRequestContext	createRequestContext(Protocol.ReadRequest request)
void	exceptionCaught(io.netty.channel.ChannelHandlerContext ctx, Throwable cause)
boolean	tooManyPendingPackets()

Methods inherited from class io.netty.channel.ChannelInboundHandlerAdapter

channelActive, channelInactive, channelReadComplete, 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

Constructor Detail

BlockReadHandler

public BlockReadHandler(ExecutorService executorService,
                        BlockWorker blockWorker,
                        alluxio.worker.netty.FileTransferType fileTransferType)

Creates an instance of AbstractReadHandler.

Parameters:

executorService - the executor service to run PacketReaders

blockWorker - the block worker

fileTransferType - the file transfer type

Method Detail

createRequestContext

protected BlockReadRequestContext createRequestContext(Protocol.ReadRequest request)

Parameters:

request - the block read request

Returns:

an instance of read request based on the request read from channel

createPacketReader

protected alluxio.worker.netty.AbstractReadHandler.PacketReader createPacketReader(BlockReadRequestContext context,
                                                                                   io.netty.channel.Channel channel)

Creates a read reader.

Parameters:

context - read request context

channel - channel

Returns:

the packet reader for this handler

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

channelRead

public void channelRead(io.netty.channel.ChannelHandlerContext ctx,
                        Object object)
                 throws Exception

Specified by:

channelRead in interface io.netty.channel.ChannelInboundHandler

Overrides:

channelRead in class io.netty.channel.ChannelInboundHandlerAdapter

Throws:

Exception

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

tooManyPendingPackets

public boolean tooManyPendingPackets()

Returns:

true if there are too many packets in-flight

acceptMessage

protected boolean acceptMessage(Object object)

Checks whether this object should be processed by this handler.

Parameters:

object - the object

Returns:

true if this object should be processed