Class MessageDispatchInterceptor

java.lang.Object

org.apache.catalina.tribes.group.ChannelInterceptorBase

org.apache.catalina.tribes.group.interceptors.MessageDispatchInterceptor

All Implemented Interfaces:

ChannelInterceptor, MessageDispatchInterceptorMBean, Heartbeat, MembershipListener

public class MessageDispatchInterceptor
extends ChannelInterceptorBase
implements MessageDispatchInterceptorMBean

The message dispatcher is a way to enable asynchronous communication through a channel. The dispatcher will look for the Channel.SEND_OPTIONS_ASYNCHRONOUS flag to be set, if it is, it will queue the message for delivery and immediately return to the sender.

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.catalina.tribes.ChannelInterceptor

ChannelInterceptor.InterceptorEvent

Field Summary

Fields

Modifier and Type	Field	Description
protected boolean	alwaysSend
protected final AtomicLong	currentSize
protected ExecutorService	executor
protected long	keepAliveTime
protected long	maxQueueSize
protected int	maxSpareThreads
protected int	maxThreads
protected boolean	run
protected static final StringManager	sm
protected boolean	useDeepClone

Fields inherited from class org.apache.catalina.tribes.group.ChannelInterceptorBase

optionFlag

Constructor Summary

Constructors

Constructor	Description
MessageDispatchInterceptor()

Method Summary

Modifier and Type	Method	Description
long	addAndGetCurrentSize(long inc)
boolean	addToQueue(ChannelMessage msg, Member[] destination, InterceptorPayload payload)
int	getActiveCount()	Return the current number of threads that are in use.
long	getCompletedTaskCount()	Return the total number of tasks that have completed execution by the pool.
long	getCurrentSize()
long	getKeepAliveTime()
long	getMaxQueueSize()
int	getMaxSpareThreads()
int	getMaxThreads()
int	getPoolSize()	Return the current number of threads that are managed by the pool.
long	getTaskCount()	Return the total number of tasks that have ever been scheduled for execution by the pool.
boolean	getUseDeepClone()
boolean	isAlwaysSend()
protected void	sendAsyncData(ChannelMessage msg, Member[] destination, InterceptorPayload payload)
void	sendMessage(Member[] destination, ChannelMessage msg, InterceptorPayload payload)	The sendMessage method is called when a message is being sent to one more destinations.
void	setAlwaysSend(boolean alwaysSend)
long	setAndGetCurrentSize(long value)
void	setKeepAliveTime(long keepAliveTime)
void	setMaxQueueSize(long maxQueueSize)
void	setMaxSpareThreads(int maxSpareThreads)
void	setMaxThreads(int maxThreads)
void	setOptionFlag(int flag)	Sets the option flag
void	setUseDeepClone(boolean useDeepClone)
void	start(int svc)	Starts up the channel.
void	startQueue()
void	stop(int svc)	Shuts down the channel.
void	stopQueue()

Methods inherited from class org.apache.catalina.tribes.group.ChannelInterceptorBase

fireInterceptorEvent, getChannel, getLocalMember, getMember, getMembers, getNext, getOptionFlag, getPrevious, hasMembers, heartbeat, memberAdded, memberDisappeared, messageReceived, okToProcess, setChannel, setNext, setPrevious

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.catalina.tribes.group.interceptors.MessageDispatchInterceptorMBean

getOptionFlag

Field Details

sm

protected static final StringManager sm

maxQueueSize

protected long maxQueueSize

run

protected volatile boolean run

useDeepClone

protected boolean useDeepClone

alwaysSend

protected boolean alwaysSend

currentSize

protected final AtomicLong currentSize

executor

protected ExecutorService executor

maxThreads

protected int maxThreads

maxSpareThreads

protected int maxSpareThreads

keepAliveTime

protected long keepAliveTime

Constructor Details

MessageDispatchInterceptor

public MessageDispatchInterceptor()

Method Details

sendMessage

public void sendMessage(Member[] destination,
 ChannelMessage msg,
 InterceptorPayload payload)
                 throws ChannelException

Description copied from interface: ChannelInterceptor

The sendMessage method is called when a message is being sent to one more destinations. The interceptor can modify any of the parameters and then pass on the message down the stack by invoking getNext().sendMessage(destination,msg,payload).

Alternatively the interceptor can stop the message from being sent by not invoking getNext().sendMessage(destination,msg,payload).

If the message is to be sent asynchronous the application can be notified of completion and errors by passing in an error handler attached to a payload object.

The ChannelMessage.getAddress contains Channel.getLocalMember, and can be overwritten to simulate a message sent from another node.

Specified by:

sendMessage in interface ChannelInterceptor

Overrides:

sendMessage in class ChannelInterceptorBase

Parameters:

destination - Member[] - the destination for this message

msg - ChannelMessage - the message to be sent

payload - InterceptorPayload - the payload, carrying an error handler and future useful data, can be null

Throws:

ChannelException - if a serialization error happens.

See Also:

• ErrorHandler
• InterceptorPayload

addToQueue

public boolean addToQueue(ChannelMessage msg,
 Member[] destination,
 InterceptorPayload payload)

startQueue

public void startQueue()

stopQueue

public void stopQueue()

setOptionFlag

public void setOptionFlag(int flag)

Description copied from interface: ChannelInterceptor

Sets the option flag

Specified by:

setOptionFlag in interface ChannelInterceptor

Overrides:

setOptionFlag in class ChannelInterceptorBase

Parameters:

flag - int

See Also:

• ChannelInterceptor.getOptionFlag()

setMaxQueueSize

public void setMaxQueueSize(long maxQueueSize)

setUseDeepClone

public void setUseDeepClone(boolean useDeepClone)

getMaxQueueSize

public long getMaxQueueSize()

Specified by:

getMaxQueueSize in interface MessageDispatchInterceptorMBean

getUseDeepClone

public boolean getUseDeepClone()

getCurrentSize

public long getCurrentSize()

Specified by:

getCurrentSize in interface MessageDispatchInterceptorMBean

addAndGetCurrentSize

public long addAndGetCurrentSize(long inc)

setAndGetCurrentSize

public long setAndGetCurrentSize(long value)

getKeepAliveTime

public long getKeepAliveTime()

Specified by:

getKeepAliveTime in interface MessageDispatchInterceptorMBean

getMaxSpareThreads

public int getMaxSpareThreads()

Specified by:

getMaxSpareThreads in interface MessageDispatchInterceptorMBean

getMaxThreads

public int getMaxThreads()

Specified by:

getMaxThreads in interface MessageDispatchInterceptorMBean

setKeepAliveTime

public void setKeepAliveTime(long keepAliveTime)

setMaxSpareThreads

public void setMaxSpareThreads(int maxSpareThreads)

setMaxThreads

public void setMaxThreads(int maxThreads)

isAlwaysSend

public boolean isAlwaysSend()

Specified by:

isAlwaysSend in interface MessageDispatchInterceptorMBean

setAlwaysSend

public void setAlwaysSend(boolean alwaysSend)

Specified by:

setAlwaysSend in interface MessageDispatchInterceptorMBean

start

public void start(int svc)
           throws ChannelException

Description copied from interface: ChannelInterceptor

Starts up the channel. This can be called multiple times for individual services to start The svc parameter can be the logical or value of any constants

Specified by:

start in interface ChannelInterceptor

Overrides:

start in class ChannelInterceptorBase

Parameters:

svc - one of:

• Channel.DEFAULT - will start all services
• Channel.MBR_RX_SEQ - starts the membership receiver
• Channel.MBR_TX_SEQ - starts the membership broadcaster
• Channel.SND_TX_SEQ - starts the replication transmitter
• Channel.SND_RX_SEQ - starts the replication receiver

Throws:

ChannelException - if a startup error occurs or the service is already started.

See Also:

• Channel

stop

public void stop(int svc)
          throws ChannelException

Description copied from interface: ChannelInterceptor

Shuts down the channel. This can be called multiple times for individual services to shut down. The svc parameter can be the logical or value of any constants

Specified by:

stop in interface ChannelInterceptor

Overrides:

stop in class ChannelInterceptorBase

Parameters:

svc - one of:

• Channel.DEFAULT - will shut down all services
• Channel.MBR_RX_SEQ - stops the membership receiver
• Channel.MBR_TX_SEQ - stops the membership broadcaster
• Channel.SND_TX_SEQ - stops the replication transmitter
• Channel.SND_RX_SEQ - stops the replication receiver

Throws:

ChannelException - if a startup error occurs or the service is already started.

See Also:

• Channel

sendAsyncData

protected void sendAsyncData(ChannelMessage msg,
 Member[] destination,
 InterceptorPayload payload)

getPoolSize

public int getPoolSize()

Return the current number of threads that are managed by the pool.

Specified by:

getPoolSize in interface MessageDispatchInterceptorMBean

Returns:

the current number of threads that are managed by the pool

getActiveCount

public int getActiveCount()

Return the current number of threads that are in use.

Specified by:

getActiveCount in interface MessageDispatchInterceptorMBean

Returns:

the current number of threads that are in use

getTaskCount

public long getTaskCount()

Return the total number of tasks that have ever been scheduled for execution by the pool.

Specified by:

getTaskCount in interface MessageDispatchInterceptorMBean

Returns:

the total number of tasks that have ever been scheduled for execution by the pool

getCompletedTaskCount

public long getCompletedTaskCount()

Return the total number of tasks that have completed execution by the pool.

Specified by:

getCompletedTaskCount in interface MessageDispatchInterceptorMBean

Returns:

the total number of tasks that have completed execution by the pool