Package io.pravega.shared.protocol.netty

Class AppendDecoder

java.lang.Object

io.netty.channel.ChannelHandlerAdapter

io.netty.channel.ChannelInboundHandlerAdapter

io.netty.handler.codec.MessageToMessageDecoder<WireCommand>

io.pravega.shared.protocol.netty.AppendDecoder

All Implemented Interfaces:

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

public class AppendDecoder
extends io.netty.handler.codec.MessageToMessageDecoder<WireCommand>

AppendBlocks are decoded specially to avoid having to parse every append individually. This is done by holding onto the AppendBlock command and waiting for the following command which must be an AppendBlockEnd. The AppendBlockEnd command should have all of the information need to construct a single Append object with all of the Events in the block.

The decode(io.netty.channel.ChannelHandlerContext, io.pravega.shared.protocol.netty.WireCommand, java.util.List<java.lang.Object>) method invokes processCommand(WireCommand) to generate Request instances. Please refer to processCommand(WireCommand) Javadoc for important information about returned objects.

See Also:

For details about handling of PartialEvents

Nested Class Summary

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

io.netty.channel.ChannelHandler.Sharable

Constructor Summary

Constructors

Constructor	Description
AppendDecoder()

Method Summary

Modifier and Type	Method	Description
boolean	acceptInboundMessage(java.lang.Object msg)
protected void	decode(io.netty.channel.ChannelHandlerContext ctx, WireCommand command, java.util.List<java.lang.Object> out)

Methods inherited from class io.netty.handler.codec.MessageToMessageDecoder

channelRead

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

Constructor Detail

AppendDecoder

public AppendDecoder()

Method Detail

acceptInboundMessage

public boolean acceptInboundMessage(java.lang.Object msg)
                             throws java.lang.Exception

Overrides:

acceptInboundMessage in class io.netty.handler.codec.MessageToMessageDecoder<WireCommand>

Throws:

java.lang.Exception

decode

protected void decode(io.netty.channel.ChannelHandlerContext ctx,
                      WireCommand command,
                      java.util.List<java.lang.Object> out)
               throws java.lang.Exception

Specified by:

decode in class io.netty.handler.codec.MessageToMessageDecoder<WireCommand>

Throws:

java.lang.Exception