Package org.apache.catalina.tribes.group.interceptors

Class FragmentationInterceptor

java.lang.Object

org.apache.catalina.tribes.group.ChannelInterceptorBase

org.apache.catalina.tribes.group.interceptors.FragmentationInterceptor

All Implemented Interfaces:

ChannelInterceptor, FragmentationInterceptorMBean, Heartbeat, MembershipListener

public class FragmentationInterceptor
extends ChannelInterceptorBase
implements FragmentationInterceptorMBean

The fragmentation interceptor splits up large messages into smaller messages and assembles them on the other end. This is very useful when you don't want large messages hogging the sending sockets and smaller messages can make it through.
Configuration Options
FragmentationInterceptor.expire=<milliseconds> - how long do we keep the fragments in memory and wait for the rest to arrive default=60,000ms -> 60seconds This setting is useful to avoid OutOfMemoryErrors
FragmentationInterceptor.maxSize=<max message size> - message size in bytes default=1024*100 (around a tenth of a MB)

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	FragmentationInterceptor.FragCollection
static class	FragmentationInterceptor.FragKey

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

ChannelInterceptor.InterceptorEvent

Field Summary

Fields

Modifier and Type	Field	Description
protected final boolean	deepclone
protected final HashMap<FragmentationInterceptor.FragKey,FragmentationInterceptor.FragCollection>	fragpieces
protected static final StringManager	sm

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

optionFlag

Constructor Summary

Constructors

Constructor	Description
FragmentationInterceptor()

Method Summary

Modifier and Type	Method	Description
void	defrag(ChannelMessage msg)
void	frag(Member[] destination, ChannelMessage msg, InterceptorPayload payload)
long	getExpire()
FragmentationInterceptor.FragCollection	getFragCollection(FragmentationInterceptor.FragKey key, ChannelMessage msg)
int	getMaxSize()
void	heartbeat()	The heartbeat() method gets invoked periodically to allow interceptors to clean up resources, time out object and perform actions that are unrelated to sending/receiving data.
void	messageReceived(ChannelMessage msg)	The messageReceived is invoked when a message is received.
void	removeFragCollection(FragmentationInterceptor.FragKey key)
void	sendMessage(Member[] destination, ChannelMessage msg, InterceptorPayload payload)	The sendMessage method is called when a message is being sent to one more destinations.
void	setExpire(long expire)
void	setMaxSize(int maxSize)

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

fireInterceptorEvent, getChannel, getLocalMember, getMember, getMembers, getNext, getOptionFlag, getPrevious, hasMembers, memberAdded, memberDisappeared, okToProcess, setChannel, setNext, setOptionFlag, setPrevious, start, stop

Methods inherited from class java.lang.Object

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

Field Details

sm

protected static final StringManager sm

fragpieces

protected final HashMap<FragmentationInterceptor.FragKey,FragmentationInterceptor.FragCollection> fragpieces

deepclone

protected final boolean deepclone

See Also:

• Constant Field Values

Constructor Details

FragmentationInterceptor

public FragmentationInterceptor()

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

messageReceived

public void messageReceived(ChannelMessage msg)

Description copied from interface: ChannelInterceptor

The messageReceived is invoked when a message is received. ChannelMessage.getAddress() is the sender, or the reply-to address if it has been overwritten.

Specified by:

messageReceived in interface ChannelInterceptor

Overrides:

messageReceived in class ChannelInterceptorBase

Parameters:

msg - ChannelMessage

getFragCollection

public FragmentationInterceptor.FragCollection getFragCollection(FragmentationInterceptor.FragKey key,
 ChannelMessage msg)

removeFragCollection

public void removeFragCollection(FragmentationInterceptor.FragKey key)

defrag

public void defrag(ChannelMessage msg)

frag

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

Throws:

ChannelException

heartbeat

public void heartbeat()

Description copied from interface: ChannelInterceptor

The heartbeat() method gets invoked periodically to allow interceptors to clean up resources, time out object and perform actions that are unrelated to sending/receiving data.

Specified by:

heartbeat in interface ChannelInterceptor

Specified by:

heartbeat in interface Heartbeat

Overrides:

heartbeat in class ChannelInterceptorBase

getMaxSize

public int getMaxSize()

Specified by:

getMaxSize in interface FragmentationInterceptorMBean

getExpire

public long getExpire()

Specified by:

getExpire in interface FragmentationInterceptorMBean

setMaxSize

public void setMaxSize(int maxSize)

Specified by:

setMaxSize in interface FragmentationInterceptorMBean

setExpire

public void setExpire(long expire)

Specified by:

setExpire in interface FragmentationInterceptorMBean