com.latencybusters.umds.UMDSReceiverRecoveryInfo Class Reference

Class to give applications access to persistence-related information, and to allow limited control over persistent recovery. More...

Public Member Functions
	UMDSReceiverRecoveryInfo (int flags, int lowSequenceNumber, int highSequenceNumber, long srcSessionId, String topic, Object receiverRecoveryInfoCbArg) throws UMDSException
	Constructor, initializes fields to the given values. Not for application use. More...
int	getFlags ()
	Get "flags" field. For future expansion, not currently used. More...
int	getLowSequenceNumber ()
	Get sequence number for oldest message in UMDS server's message cache for this session ID (persistent source). More...
void	setLowSequenceNumber (int startSeqNum)
	Set sequence number for starting point for persistent message recovery. More...
int	getHighSequenceNumber ()
	Get "highSequenceNumber" field. For future expansion, not currently used. More...
long	getSrcSessionId ()
	Get persistent source's session id. More...
Object	getReceiverRecoveryInfoCbArg ()
	Get the arbitrary application object passed to UMDSReceiverRecoveryInfoCallback::setReceiverRecoverySequenceNumber(). More...
String	getTopic ()
	Get Topic string. More...
String	toString ()
	Create a human-readable string containing the internal state of this object. More...

Detailed Description

Class to give applications access to persistence-related information, and to allow limited control over persistent recovery.

An object derived from this class is passed to UMDSPersistentReceiver::UMDSReceiverRecoveryInfoCallback(). That object is used to call back to the application when a persistent registration with the UMDS server is completed.

Methods of interest to applications are:

• getLowSequenceNumber() - oldest persisted message number available in the UMDS server. Unless overridden by the application, this will typically be the first message recovered.
• getSrcSessionId() - UM Persistence session ID for this source.
• getTopic() - Topic string for this source.
• getReceiverRecoveryInfoCbArg() - Optional arbitrary application object supplied to the UMDSPersistentReceiver() constructor.
• toString() - creates a printable string with Persistence information.
• setLowSequenceNumber() - override UMDS's oldest message number with a desired startring point for recovery.

Other methods and internal fields ("flags", "highSequenceNumber") are defined for future expansion but are not currently used.

Because of race conditions, it is possible that the first recovery message delivered to the application will be a later message than the one specified by the lowSequenceNumber.

Constructor & Destructor Documentation

com.latencybusters.umds.UMDSReceiverRecoveryInfo.UMDSReceiverRecoveryInfo	(	int	flags,
		int	lowSequenceNumber,
		int	highSequenceNumber,
		long	srcSessionId,
		String	topic,
		Object	receiverRecoveryInfoCbArg
	)		throws UMDSException

Constructor, initializes fields to the given values. Not for application use.

Applications do not normally create this object. UMDS creates it internally and passes it to UMDSReceiverRecoveryInfoCallback::setReceiverRecoverySequenceNumber().

Parameters

flags	Informational flags.
lowSequenceNumber	Low sequence number (can be changed by the application, must be >= 0).
highSequenceNumber	High sequence number (can be changed by the application, must be >= 0).
srcSessionId	The session ID for the source
topic	Topic string
receiverRecoveryInfoCbArg	Optional arbitrary application object passed to UMDSReceiverRecoveryInfoCallback::setReceiverRecoverySequenceNumber().

Exceptions

UMDSException

Member Function Documentation

int com.latencybusters.umds.UMDSReceiverRecoveryInfo.getFlags

(

)

Get "flags" field. For future expansion, not currently used.

Returns

Informational flags.

int com.latencybusters.umds.UMDSReceiverRecoveryInfo.getHighSequenceNumber

(

)

Get "highSequenceNumber" field. For future expansion, not currently used.

Returns

high sequence number.

Referenced by com.latencybusters.umds.UMDSServerConnection.send().

int com.latencybusters.umds.UMDSReceiverRecoveryInfo.getLowSequenceNumber

(

)

Get sequence number for oldest message in UMDS server's message cache for this session ID (persistent source).

This is the intended starting point for persistent message recovery. The application can override this by calling getLowSequenceNumber().

Returns

low sequence number.

Referenced by com.latencybusters.umds.UMDSServerConnection.send().

Object com.latencybusters.umds.UMDSReceiverRecoveryInfo.getReceiverRecoveryInfoCbArg

(

)

Get the arbitrary application object passed to UMDSReceiverRecoveryInfoCallback::setReceiverRecoverySequenceNumber().

Returns

application object.

long com.latencybusters.umds.UMDSReceiverRecoveryInfo.getSrcSessionId

(

)

Get persistent source's session id.

Note that the session id is an unsigned 64 bit value, represented here as a signed long.

Returns

The source's session ID

Referenced by com.latencybusters.umds.UMDSServerConnection.send().

String com.latencybusters.umds.UMDSReceiverRecoveryInfo.getTopic

(

)

Get Topic string.

Returns

topic string.

Referenced by com.latencybusters.umds.UMDSServerConnection.send().

void com.latencybusters.umds.UMDSReceiverRecoveryInfo.setLowSequenceNumber

(

int

startSeqNum

)

Set sequence number for starting point for persistent message recovery.

Overrides the low sequence number supplied by the UMDS server.

Parameters

startSeqNum

Desired starting sequence number for recovery (must be >= 0).

String com.latencybusters.umds.UMDSReceiverRecoveryInfo.toString

(

)

Create a human-readable string containing the internal state of this object.

Returns

printable string.

---

The documentation for this class was generated from the following file:

• UMDSReceiverRecoveryInfo.java