org.openspaces.memcached.protocol

Class MemcachedCommandHandler

java.lang.Object

org.jboss.netty.channel.SimpleChannelUpstreamHandler

org.openspaces.memcached.protocol.MemcachedCommandHandler

All Implemented Interfaces:

org.jboss.netty.channel.ChannelHandler, org.jboss.netty.channel.ChannelUpstreamHandler

@ChannelHandler.Sharable
public final class MemcachedCommandHandler
extends org.jboss.netty.channel.SimpleChannelUpstreamHandler

The actual command handler, which is responsible for processing the CommandMessage instances that are inbound from the protocol decoders.

One instance is shared among the entire pipeline, since this handler is stateless, apart from some globals for the entire daemon.

The command handler produces ResponseMessages which are destined for the response encoder.

Nested Class Summary

Nested classes/interfaces inherited from interface org.jboss.netty.channel.ChannelHandler

org.jboss.netty.channel.ChannelHandler.Sharable

Field Summary

Fields

Modifier and Type	Field and Description
AtomicInteger	curr_conns
int	idle_limit
protected static Log	logger
AtomicInteger	total_conns
boolean	verbose
String	version The following state variables are universal for the entire daemon.

Constructor Summary

Constructors

Constructor and Description
MemcachedCommandHandler(SpaceCache cache, String memcachedVersion, boolean verbosity, int idle, org.jboss.netty.channel.group.DefaultChannelGroup channelGroup) Construct the server session handler

Method Summary

Modifier and Type	Method and Description
void	channelClosed(org.jboss.netty.channel.ChannelHandlerContext channelHandlerContext, org.jboss.netty.channel.ChannelStateEvent channelStateEvent) On close we manage some statistics, and remove this connection from the channel group.
void	channelOpen(org.jboss.netty.channel.ChannelHandlerContext channelHandlerContext, org.jboss.netty.channel.ChannelStateEvent channelStateEvent) On open we manage some statistics, and add this connection to the channel group.
protected void	handleAdd(org.jboss.netty.channel.ChannelHandlerContext channelHandlerContext, CommandMessage command, org.jboss.netty.channel.Channel channel)
protected void	handleAppend(org.jboss.netty.channel.ChannelHandlerContext channelHandlerContext, CommandMessage command, org.jboss.netty.channel.Channel channel)
protected void	handleCas(org.jboss.netty.channel.ChannelHandlerContext channelHandlerContext, CommandMessage command, org.jboss.netty.channel.Channel channel)
protected void	handleDecr(org.jboss.netty.channel.ChannelHandlerContext channelHandlerContext, CommandMessage command, org.jboss.netty.channel.Channel channel)
protected void	handleDelete(org.jboss.netty.channel.ChannelHandlerContext channelHandlerContext, CommandMessage command, org.jboss.netty.channel.Channel channel)
protected void	handleFlush(org.jboss.netty.channel.ChannelHandlerContext channelHandlerContext, CommandMessage command, org.jboss.netty.channel.Channel channel)
protected void	handleGets(org.jboss.netty.channel.ChannelHandlerContext channelHandlerContext, CommandMessage command, org.jboss.netty.channel.Channel channel)
protected void	handleIncr(org.jboss.netty.channel.ChannelHandlerContext channelHandlerContext, CommandMessage command, org.jboss.netty.channel.Channel channel)
protected void	handleNoOp(org.jboss.netty.channel.ChannelHandlerContext channelHandlerContext, CommandMessage command)
protected void	handlePrepend(org.jboss.netty.channel.ChannelHandlerContext channelHandlerContext, CommandMessage command, org.jboss.netty.channel.Channel channel)
protected void	handleQuit(org.jboss.netty.channel.Channel channel)
protected void	handleReplace(org.jboss.netty.channel.ChannelHandlerContext channelHandlerContext, CommandMessage command, org.jboss.netty.channel.Channel channel)
protected void	handleSet(org.jboss.netty.channel.ChannelHandlerContext channelHandlerContext, CommandMessage command, org.jboss.netty.channel.Channel channel)
protected void	handleStats(org.jboss.netty.channel.ChannelHandlerContext channelHandlerContext, CommandMessage command, int cmdKeysSize, org.jboss.netty.channel.Channel channel)
protected void	handleVerbosity(org.jboss.netty.channel.ChannelHandlerContext channelHandlerContext, CommandMessage command, org.jboss.netty.channel.Channel channel)
protected void	handleVersion(org.jboss.netty.channel.ChannelHandlerContext channelHandlerContext, CommandMessage command, org.jboss.netty.channel.Channel channel)
void	messageReceived(org.jboss.netty.channel.ChannelHandlerContext channelHandlerContext, org.jboss.netty.channel.MessageEvent messageEvent) The actual meat of the matter.

Methods inherited from class org.jboss.netty.channel.SimpleChannelUpstreamHandler

channelBound, channelConnected, channelDisconnected, channelInterestChanged, channelUnbound, childChannelClosed, childChannelOpen, exceptionCaught, handleUpstream, writeComplete

Methods inherited from class java.lang.Object

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

Field Detail

logger

protected static final Log logger

curr_conns

public final AtomicInteger curr_conns

total_conns

public final AtomicInteger total_conns

version

public final String version

The following state variables are universal for the entire daemon. These are used for statistics gathering. In order for these values to work properly, the handler _must_ be declared with a ChannelPipelineCoverage of "all".

idle_limit

public final int idle_limit

verbose

public final boolean verbose

Constructor Detail

MemcachedCommandHandler

public MemcachedCommandHandler(SpaceCache cache,
                               String memcachedVersion,
                               boolean verbosity,
                               int idle,
                               org.jboss.netty.channel.group.DefaultChannelGroup channelGroup)

Construct the server session handler

Parameters:

cache - the cache to use

memcachedVersion - the version string to return to clients

verbosity - verbosity level for debugging

idle - how long sessions can be idle for

channelGroup -

Method Detail

channelOpen

public void channelOpen(org.jboss.netty.channel.ChannelHandlerContext channelHandlerContext,
                        org.jboss.netty.channel.ChannelStateEvent channelStateEvent)
                 throws Exception

On open we manage some statistics, and add this connection to the channel group.

Overrides:

channelOpen in class org.jboss.netty.channel.SimpleChannelUpstreamHandler

Parameters:

channelHandlerContext -

channelStateEvent -

Throws:

Exception

channelClosed

public void channelClosed(org.jboss.netty.channel.ChannelHandlerContext channelHandlerContext,
                          org.jboss.netty.channel.ChannelStateEvent channelStateEvent)
                   throws Exception

On close we manage some statistics, and remove this connection from the channel group.

Overrides:

channelClosed in class org.jboss.netty.channel.SimpleChannelUpstreamHandler

Parameters:

channelHandlerContext -

channelStateEvent -

Throws:

Exception

messageReceived

public void messageReceived(org.jboss.netty.channel.ChannelHandlerContext channelHandlerContext,
                            org.jboss.netty.channel.MessageEvent messageEvent)
                     throws Exception

The actual meat of the matter. Turn CommandMessages into executions against the physical cache, and then pass on the downstream messages.

Overrides:

messageReceived in class org.jboss.netty.channel.SimpleChannelUpstreamHandler

Parameters:

channelHandlerContext -

messageEvent -

Throws:

Exception

handleNoOp

protected void handleNoOp(org.jboss.netty.channel.ChannelHandlerContext channelHandlerContext,
                          CommandMessage command)

handleFlush

protected void handleFlush(org.jboss.netty.channel.ChannelHandlerContext channelHandlerContext,
                           CommandMessage command,
                           org.jboss.netty.channel.Channel channel)

handleVerbosity

protected void handleVerbosity(org.jboss.netty.channel.ChannelHandlerContext channelHandlerContext,
                               CommandMessage command,
                               org.jboss.netty.channel.Channel channel)

handleQuit

protected void handleQuit(org.jboss.netty.channel.Channel channel)

handleVersion

protected void handleVersion(org.jboss.netty.channel.ChannelHandlerContext channelHandlerContext,
                             CommandMessage command,
                             org.jboss.netty.channel.Channel channel)

handleStats

protected void handleStats(org.jboss.netty.channel.ChannelHandlerContext channelHandlerContext,
                           CommandMessage command,
                           int cmdKeysSize,
                           org.jboss.netty.channel.Channel channel)

handleDelete

protected void handleDelete(org.jboss.netty.channel.ChannelHandlerContext channelHandlerContext,
                            CommandMessage command,
                            org.jboss.netty.channel.Channel channel)

handleDecr

protected void handleDecr(org.jboss.netty.channel.ChannelHandlerContext channelHandlerContext,
                          CommandMessage command,
                          org.jboss.netty.channel.Channel channel)

handleIncr

protected void handleIncr(org.jboss.netty.channel.ChannelHandlerContext channelHandlerContext,
                          CommandMessage command,
                          org.jboss.netty.channel.Channel channel)

handlePrepend

protected void handlePrepend(org.jboss.netty.channel.ChannelHandlerContext channelHandlerContext,
                             CommandMessage command,
                             org.jboss.netty.channel.Channel channel)

handleAppend

protected void handleAppend(org.jboss.netty.channel.ChannelHandlerContext channelHandlerContext,
                            CommandMessage command,
                            org.jboss.netty.channel.Channel channel)

handleReplace

protected void handleReplace(org.jboss.netty.channel.ChannelHandlerContext channelHandlerContext,
                             CommandMessage command,
                             org.jboss.netty.channel.Channel channel)

handleAdd

protected void handleAdd(org.jboss.netty.channel.ChannelHandlerContext channelHandlerContext,
                         CommandMessage command,
                         org.jboss.netty.channel.Channel channel)

handleCas

protected void handleCas(org.jboss.netty.channel.ChannelHandlerContext channelHandlerContext,
                         CommandMessage command,
                         org.jboss.netty.channel.Channel channel)

handleSet

protected void handleSet(org.jboss.netty.channel.ChannelHandlerContext channelHandlerContext,
                         CommandMessage command,
                         org.jboss.netty.channel.Channel channel)

handleGets

protected void handleGets(org.jboss.netty.channel.ChannelHandlerContext channelHandlerContext,
                          CommandMessage command,
                          org.jboss.netty.channel.Channel channel)