Class TableSerialExpirationBacklog

java.lang.Object

org.tentackle.dbms.TableSerialExpirationBacklog

public class TableSerialExpirationBacklog
extends Object

Keeps a backlog of expiration sets.

Author:

harald

See Also:

• ModificationTally

Constructor Summary

Constructors

Constructor	Description
TableSerialExpirationBacklog(String name)	Creates a backlog with a default size.
TableSerialExpirationBacklog(String name, int size)	Creates a backlog.

Method Summary

Modifier and Type	Method	Description
void	addExpiration(long minSerial, long maxSerial, Collection<IdSerialTuple> tuples, boolean mergeHistory)	Adds an expiration set to the backlog.
protected int	enlargeSize(int size)	Computes the enlarged size. Invoked when there is an outdated query.
TreeSet<IdSerialTuple>	getExpiration(long minSerial, long maxSerial)	Gets the expiration backlog for a given range of table-serials. An id of 0 indicates a rolled back insert or update. A negative tableserial indicates a deletion.
String	toString()

Methods inherited from class Object

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

Constructor Details

TableSerialExpirationBacklog

public TableSerialExpirationBacklog(String name,
 int size)

Creates a backlog.

Parameters:

name - the name of the backlog

size - the size of the backlog

TableSerialExpirationBacklog

public TableSerialExpirationBacklog(String name)

Creates a backlog with a default size.

Parameters:

name - the name of the backlog

Method Details

toString

public String toString()

Overrides:

toString in class Object

addExpiration

public void addExpiration(long minSerial,
 long maxSerial,
 Collection<IdSerialTuple> tuples,
 boolean mergeHistory)

Adds an expiration set to the backlog.

Parameters:

minSerial - the lower serial bound of the query (minSerial < tableSerial)

maxSerial - the upper serial bound of the query (tableSerial ≤ maxSerial)

tuples - the expiration info as pairs of id/tableserial.

mergeHistory - true to merge the TableSerialHistory

getExpiration

public TreeSet<IdSerialTuple> getExpiration(long minSerial,
 long maxSerial)

Gets the expiration backlog for a given range of table-serials.
An id of 0 indicates a rolled back insert or update.
A negative tableserial indicates a deletion.

Parameters:

minSerial - the lower serial bound of the query (minSerial < tableSerial)

maxSerial - the upper serial bound of the query (tableSerial ≤ maxSerial)

Returns:

the expiration set as tuples of id/tableserial, ordered by abs(tableserial), null if the given range was not found in the backlog

enlargeSize

protected int enlargeSize(int size)

Computes the enlarged size.
Invoked when there is an outdated query.

Parameters:

size - the current size

Returns:

the enlarged size, same if no more enlargement possible