org.apache.cassandra.net

Class MessagingService

java.lang.Object

org.apache.cassandra.net.MessagingService

All Implemented Interfaces:

MessagingServiceMBean

public final class MessagingService
extends java.lang.Object
implements MessagingServiceMBean

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	MessagingService.Verb

Field Summary

Fields

Modifier and Type	Field and Description
static java.util.EnumMap<MessagingService.Verb,IVersionedSerializer<?>>	callbackDeserializers A Map of what kind of serializer to wire up to a REQUEST_RESPONSE callback, based on outbound Verb.
static int	current_version
static java.util.EnumSet<MessagingService.Verb>	DROPPABLE_VERBS Verbs it's okay to drop if the request has been queued longer than the request timeout.
static java.lang.String	MBEAN_NAME
static int	PROTOCOL_MAGIC we preface every message with this number so the recipient can validate the sender is sane
static java.util.EnumMap<MessagingService.Verb,IVersionedSerializer<?>>	verbSerializers Messages we receive in IncomingTcpConnection have a Verb that tells us what kind of message it is.
static java.util.EnumMap<MessagingService.Verb,Stage>	verbStages
static int	VERSION_12
static int	VERSION_20

Method Summary

Methods

Modifier and Type	Method and Description
int	addCallback(IAsyncCallback cb, MessageOut message, java.net.InetAddress to, long timeout)
void	addLatency(java.net.InetAddress address, long latency)
void	clearCallbacksUnsafe()
void	convict(java.net.InetAddress ep) called from gossiper when it notices a node is not responding.
void	destroyConnectionPool(java.net.InetAddress to)
static int	getBits(int packed, int start, int count)
java.util.Map<java.lang.String,java.lang.Long>	getCommandCompletedTasks() Completed tasks for Command(Mutations, Read etc) TCP Connections
java.util.Map<java.lang.String,java.lang.Long>	getCommandDroppedTasks() Dropped tasks for Command(Mutations, Read etc) TCP Connections
java.util.Map<java.lang.String,java.lang.Integer>	getCommandPendingTasks() Pending tasks for Command(Mutations, Read etc) TCP Connections
int	getCommandPendingTasks(java.net.InetAddress address)
OutboundTcpConnection	getConnection(java.net.InetAddress to, MessageOut msg)
OutboundTcpConnectionPool	getConnectionPool(java.net.InetAddress to)
java.util.Map<java.lang.String,java.lang.Integer>	getDroppedMessages() dropped message counts for server lifetime
java.util.Map<java.lang.String,java.lang.Integer>	getRecentlyDroppedMessages() dropped message counts since last called
java.util.Map<java.lang.String,java.lang.Long>	getRecentTimeoutsPerHost() Number of timeouts since last check per host.
long	getRecentTotalTimouts() Number of timeouts since last check.
CallbackInfo	getRegisteredCallback(int messageId)
long	getRegisteredCallbackAge(int messageId)
java.util.Map<java.lang.String,java.lang.Long>	getResponseCompletedTasks() Completed tasks for Response(GOSSIP & RESPONSE) TCP Connections
java.util.Map<java.lang.String,java.lang.Integer>	getResponsePendingTasks() Pending tasks for Response(GOSSIP & RESPONSE) TCP Connections
java.util.Map<java.lang.String,java.lang.Long>	getTimeoutsPerHost() Number of timeouts per host
long	getTotalTimeouts() Total number of timeouts happened on this node
IVerbHandler	getVerbHandler(MessagingService.Verb type) This method returns the verb handler associated with the registered verb.
java.lang.Integer	getVersion(java.net.InetAddress address)
int	getVersion(java.lang.String address)
void	incrementDroppedMessages(MessagingService.Verb verb)
static MessagingService	instance()
boolean	knowsVersion(java.net.InetAddress endpoint)
void	listen(java.net.InetAddress localEp) Listen on the specified port.
void	maybeAddLatency(IAsyncCallback cb, java.net.InetAddress address, long latency) Track latency information for the dynamic snitch
void	receive(MessageIn message, int id, long timestamp)
void	register(ILatencySubscriber subcriber)
void	registerVerbHandlers(MessagingService.Verb verb, IVerbHandler verbHandler) Register a verb and the corresponding verb handler with the Messaging Service.
CallbackInfo	removeRegisteredCallback(int messageId)
void	resetVersion(java.net.InetAddress endpoint)
void	sendOneWay(MessageOut message, java.net.InetAddress to)
void	sendOneWay(MessageOut message, int id, java.net.InetAddress to) Send a message to a given endpoint.
void	sendReply(MessageOut message, int id, java.net.InetAddress to)
<T> AsyncOneResponse<T>	sendRR(MessageOut message, java.net.InetAddress to)
int	sendRR(MessageOut message, java.net.InetAddress to, IAsyncCallback cb)
int	sendRR(MessageOut message, java.net.InetAddress to, IAsyncCallback cb, long timeout) Send a message to a given endpoint.
void	setCallbackForTests(int messageId, CallbackInfo callback)
int	setVersion(java.net.InetAddress address, int version)
void	shutdown() Wait for callbacks and don't allow any more to be created (since they could require writing hints)
static void	validateMagic(int magic)
void	waitForStreaming()
void	waitUntilListening()

Methods inherited from class java.lang.Object

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

Field Detail

MBEAN_NAME

public static final java.lang.String MBEAN_NAME

See Also:

Constant Field Values

VERSION_12

public static final int VERSION_12

See Also:

Constant Field Values

VERSION_20

public static final int VERSION_20

See Also:

Constant Field Values

current_version

public static final int current_version

See Also:

Constant Field Values

PROTOCOL_MAGIC

public static final int PROTOCOL_MAGIC

we preface every message with this number so the recipient can validate the sender is sane

See Also:

Constant Field Values

verbStages

public static final java.util.EnumMap<MessagingService.Verb,Stage> verbStages

verbSerializers

public static final java.util.EnumMap<MessagingService.Verb,IVersionedSerializer<?>> verbSerializers

Messages we receive in IncomingTcpConnection have a Verb that tells us what kind of message it is. Most of the time, this is enough to determine how to deserialize the message payload. The exception is the REQUEST_RESPONSE verb, which just means "a reply to something you told me to do." Traditionally, this was fine since each VerbHandler knew what type of payload it expected, and handled the deserialization itself. Now that we do that in ITC, to avoid the extra copy to an intermediary byte[] (See CASSANDRA-3716), we need to wire that up to the CallbackInfo object (see below).

callbackDeserializers

public static final java.util.EnumMap<MessagingService.Verb,IVersionedSerializer<?>> callbackDeserializers

A Map of what kind of serializer to wire up to a REQUEST_RESPONSE callback, based on outbound Verb.

DROPPABLE_VERBS

public static final java.util.EnumSet<MessagingService.Verb> DROPPABLE_VERBS

Verbs it's okay to drop if the request has been queued longer than the request timeout. These all correspond to client requests or something triggered by them; we don't want to drop internal messages like bootstrap or repair notifications.

Method Detail

instance

public static MessagingService instance()

maybeAddLatency

public void maybeAddLatency(IAsyncCallback cb,
                   java.net.InetAddress address,
                   long latency)

Track latency information for the dynamic snitch

Parameters:

cb - the callback associated with this message -- this lets us know if it's a message type we're interested in

address - the host that replied to the message

latency -

addLatency

public void addLatency(java.net.InetAddress address,
              long latency)

convict

public void convict(java.net.InetAddress ep)

called from gossiper when it notices a node is not responding.

listen

public void listen(java.net.InetAddress localEp)
            throws ConfigurationException

Listen on the specified port.

Parameters:

localEp - InetAddress whose port to listen on.

Throws:

ConfigurationException

waitUntilListening

public void waitUntilListening()

destroyConnectionPool

public void destroyConnectionPool(java.net.InetAddress to)

getConnectionPool

public OutboundTcpConnectionPool getConnectionPool(java.net.InetAddress to)

getConnection

public OutboundTcpConnection getConnection(java.net.InetAddress to,
                                  MessageOut msg)

registerVerbHandlers

public void registerVerbHandlers(MessagingService.Verb verb,
                        IVerbHandler verbHandler)

Register a verb and the corresponding verb handler with the Messaging Service.

Parameters:

verb -

verbHandler - handler for the specified verb

getVerbHandler

public IVerbHandler getVerbHandler(MessagingService.Verb type)

This method returns the verb handler associated with the registered verb. If no handler has been registered then null is returned.

Parameters:

type - for which the verb handler is sought

Returns:

a reference to IVerbHandler which is the handler for the specified verb

addCallback

public int addCallback(IAsyncCallback cb,
              MessageOut message,
              java.net.InetAddress to,
              long timeout)

sendRR

public int sendRR(MessageOut message,
         java.net.InetAddress to,
         IAsyncCallback cb)

sendRR

public int sendRR(MessageOut message,
         java.net.InetAddress to,
         IAsyncCallback cb,
         long timeout)

Send a message to a given endpoint. This method specifies a callback which is invoked with the actual response. Also holds the message (only mutation messages) to determine if it needs to trigger a hint (uses StorageProxy for that).

Parameters:

message - message to be sent.

to - endpoint to which the message needs to be sent

cb - callback interface which is used to pass the responses or suggest that a timeout occurred to the invoker of the send(). suggest that a timeout occurred to the invoker of the send().

timeout - the timeout used for expiration

Returns:

an reference to message id used to match with the result

sendOneWay

public void sendOneWay(MessageOut message,
              java.net.InetAddress to)

sendReply

public void sendReply(MessageOut message,
             int id,
             java.net.InetAddress to)

sendOneWay

public void sendOneWay(MessageOut message,
              int id,
              java.net.InetAddress to)

Send a message to a given endpoint. This method adheres to the fire and forget style messaging.

Parameters:

message - messages to be sent.

to - endpoint to which the message needs to be sent

sendRR

public <T> AsyncOneResponse<T> sendRR(MessageOut message,
                             java.net.InetAddress to)

register

public void register(ILatencySubscriber subcriber)

clearCallbacksUnsafe

public void clearCallbacksUnsafe()

waitForStreaming

public void waitForStreaming()
                      throws java.lang.InterruptedException

Throws:

java.lang.InterruptedException

shutdown

public void shutdown()

Wait for callbacks and don't allow any more to be created (since they could require writing hints)

receive

public void receive(MessageIn message,
           int id,
           long timestamp)

setCallbackForTests

public void setCallbackForTests(int messageId,
                       CallbackInfo callback)

getRegisteredCallback

public CallbackInfo getRegisteredCallback(int messageId)

removeRegisteredCallback

public CallbackInfo removeRegisteredCallback(int messageId)

getRegisteredCallbackAge

public long getRegisteredCallbackAge(int messageId)

Returns:

System.nanoTime() when callback was created.

validateMagic

public static void validateMagic(int magic)
                          throws java.io.IOException

Throws:

java.io.IOException

getBits

public static int getBits(int packed,
          int start,
          int count)

setVersion

public int setVersion(java.net.InetAddress address,
             int version)

Returns:

the last version associated with address, or @param version if this is the first such version

resetVersion

public void resetVersion(java.net.InetAddress endpoint)

getVersion

public java.lang.Integer getVersion(java.net.InetAddress address)

getVersion

public int getVersion(java.lang.String address)
               throws java.net.UnknownHostException

Specified by:

getVersion in interface MessagingServiceMBean

Throws:

java.net.UnknownHostException

knowsVersion

public boolean knowsVersion(java.net.InetAddress endpoint)

incrementDroppedMessages

public void incrementDroppedMessages(MessagingService.Verb verb)

getCommandPendingTasks

public java.util.Map<java.lang.String,java.lang.Integer> getCommandPendingTasks()

Description copied from interface: MessagingServiceMBean

Pending tasks for Command(Mutations, Read etc) TCP Connections

Specified by:

getCommandPendingTasks in interface MessagingServiceMBean

getCommandPendingTasks

public int getCommandPendingTasks(java.net.InetAddress address)

getCommandCompletedTasks

public java.util.Map<java.lang.String,java.lang.Long> getCommandCompletedTasks()

Description copied from interface: MessagingServiceMBean

Completed tasks for Command(Mutations, Read etc) TCP Connections

Specified by:

getCommandCompletedTasks in interface MessagingServiceMBean

getCommandDroppedTasks

public java.util.Map<java.lang.String,java.lang.Long> getCommandDroppedTasks()

Description copied from interface: MessagingServiceMBean

Dropped tasks for Command(Mutations, Read etc) TCP Connections

Specified by:

getCommandDroppedTasks in interface MessagingServiceMBean

getResponsePendingTasks

public java.util.Map<java.lang.String,java.lang.Integer> getResponsePendingTasks()

Description copied from interface: MessagingServiceMBean

Pending tasks for Response(GOSSIP & RESPONSE) TCP Connections

Specified by:

getResponsePendingTasks in interface MessagingServiceMBean

getResponseCompletedTasks

public java.util.Map<java.lang.String,java.lang.Long> getResponseCompletedTasks()

Description copied from interface: MessagingServiceMBean

Completed tasks for Response(GOSSIP & RESPONSE) TCP Connections

Specified by:

getResponseCompletedTasks in interface MessagingServiceMBean

getDroppedMessages

public java.util.Map<java.lang.String,java.lang.Integer> getDroppedMessages()

Description copied from interface: MessagingServiceMBean

dropped message counts for server lifetime

Specified by:

getDroppedMessages in interface MessagingServiceMBean

getRecentlyDroppedMessages

public java.util.Map<java.lang.String,java.lang.Integer> getRecentlyDroppedMessages()

Description copied from interface: MessagingServiceMBean

dropped message counts since last called

Specified by:

getRecentlyDroppedMessages in interface MessagingServiceMBean

getTotalTimeouts

public long getTotalTimeouts()

Description copied from interface: MessagingServiceMBean

Total number of timeouts happened on this node

Specified by:

getTotalTimeouts in interface MessagingServiceMBean

getRecentTotalTimouts

public long getRecentTotalTimouts()

Description copied from interface: MessagingServiceMBean

Number of timeouts since last check.

Specified by:

getRecentTotalTimouts in interface MessagingServiceMBean

getTimeoutsPerHost

public java.util.Map<java.lang.String,java.lang.Long> getTimeoutsPerHost()

Description copied from interface: MessagingServiceMBean

Number of timeouts per host

Specified by:

getTimeoutsPerHost in interface MessagingServiceMBean

getRecentTimeoutsPerHost

public java.util.Map<java.lang.String,java.lang.Long> getRecentTimeoutsPerHost()

Description copied from interface: MessagingServiceMBean

Number of timeouts since last check per host.

Specified by:

getRecentTimeoutsPerHost in interface MessagingServiceMBean