|
||||||||||
| PREV CLASS NEXT CLASS | FRAMES NO FRAMES | |||||||||
| SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD | |||||||||
java.lang.Objectorg.apache.camel.impl.ServiceSupport
org.apache.camel.processor.StreamResequencer
public class StreamResequencer
A resequencer that re-orders a (continuous) stream of Exchanges. The
algorithm implemented by ResequencerEngine is based on the detection
of gaps in a message stream rather than on a fixed batch size. Gap detection
in combination with timeouts removes the constraint of having to know the
number of messages of a sequence (i.e. the batch size) in advance.
Messages must contain a unique sequence number for which a predecessor and a successor is known. For example a message with the sequence number 3 has a predecessor message with the sequence number 2 and a successor message with the sequence number 4. The message sequence 2,3,5 has a gap because the sucessor of 3 is missing. The resequencer therefore has to retain message 5 until message 4 arrives (or a timeout occurs).
Instances of this class poll for Exchanges from a given
endpoint. Resequencing work and the delivery of messages to
the next processor is done within the single polling thread.
ResequencerEngine| Constructor Summary | |
|---|---|
StreamResequencer(Processor processor,
SequenceElementComparator<Exchange> comparator)
Creates a new StreamResequencer instance. |
|
| Method Summary | |
|---|---|
protected void |
doStart()
|
protected void |
doStop()
|
int |
getCapacity()
Returns this resequencer's capacity. |
ExceptionHandler |
getExceptionHandler()
Returns this resequencer's exception handler. |
Processor |
getProcessor()
Returns the next processor. |
long |
getTimeout()
Returns this resequencer's timeout. |
void |
process(Exchange exchange)
Processes the message exchange |
void |
sendElement(Exchange exchange)
Sends the exchange to the next processor. |
void |
setCapacity(int capacity)
|
void |
setTimeout(long timeout)
|
String |
toString()
|
| Methods inherited from class org.apache.camel.impl.ServiceSupport |
|---|
addChildService, getStatus, getThreadName, getVersion, isRunAllowed, isStarted, isStarting, isStopped, isStopping, nextThreadCounter, notStarting, removeChildService, start, stop |
| Methods inherited from class java.lang.Object |
|---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
| Constructor Detail |
|---|
public StreamResequencer(Processor processor,
SequenceElementComparator<Exchange> comparator)
StreamResequencer instance.
processor - next processor that processes re-ordered exchanges.comparator - a sequence element comparator for exchanges.| Method Detail |
|---|
public ExceptionHandler getExceptionHandler()
public Processor getProcessor()
public int getCapacity()
timeout milliseconds giving exchanges the
possibility to time out and to be delivered after the waiting period.
public long getTimeout()
ResequencerEngine.setTimeout(long). This value is
also used to define the polling timeout from the endpoint.
ResequencerEngine.setTimeout(long)public void setCapacity(int capacity)
public void setTimeout(long timeout)
public String toString()
toString in class Object
protected void doStart()
throws Exception
doStart in class ServiceSupportException
protected void doStop()
throws Exception
doStop in class ServiceSupportException
public void sendElement(Exchange exchange)
throws Exception
exchange to the next processor.
sendElement in interface SequenceSender<Exchange>exchange - exchange to send.
Exception - if delivery fails.
public void process(Exchange exchange)
throws Exception
Processor
process in interface ProcessorException - if an internal processing error has occurred.
|
||||||||||
| PREV CLASS NEXT CLASS | FRAMES NO FRAMES | |||||||||
| SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD | |||||||||