net.sf.hajdbc.balancer.random

Class RandomBalancer<P,D extends Database<P>>

java.lang.Object

net.sf.hajdbc.balancer.AbstractBalancer<Z,D>

net.sf.hajdbc.balancer.AbstractSetBalancer<P,D>

net.sf.hajdbc.balancer.random.RandomBalancer<P,D>

Type Parameters:

D - either java.sql.Driver or javax.sql.DataSource

All Implemented Interfaces:

Iterable<D>, Collection<D>, Set<D>, Balancer<P,D>

public class RandomBalancer<P,D extends Database<P>>
extends AbstractSetBalancer<P,D>

Balancer implementation whose next() implementation returns a random database. The probability that a given database will be returned is: weight / total-weight.

Author:

Paul Ferraro

Constructor Summary

Constructors

Constructor and Description
RandomBalancer(Set<D> databases) Constructs a new RandomBalancer

Method Summary

Methods

Modifier and Type	Method and Description
protected void	added(D database) Called when a database was added to the set.
protected void	cleared() Called when the set was cleared.
D	next() Returns the next database from this balancer
protected void	removed(D database) Called when a database was removed from the set.

Methods inherited from class net.sf.hajdbc.balancer.AbstractSetBalancer

add, addAll, clear, getDatabases, getLock, invoke, primary, remove, removeAll, retainAll

Methods inherited from class net.sf.hajdbc.balancer.AbstractBalancer

backups, contains, containsAll, equals, hashCode, isEmpty, iterator, size, toArray, toArray, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

RandomBalancer

public RandomBalancer(Set<D> databases)

Constructs a new RandomBalancer

Parameters:

databases -

Method Detail

next

public D next()

Returns the next database from this balancer

Returns:

the next database from this balancer

See Also:

Balancer.next()

added

protected void added(D database)

Called when a database was added to the set.

Specified by:

added in class AbstractSetBalancer<P,D extends Database<P>>

Parameters:

database - a database descriptor

See Also:

AbstractSetBalancer.added(net.sf.hajdbc.Database)

removed

protected void removed(D database)

Called when a database was removed from the set.

Specified by:

removed in class AbstractSetBalancer<P,D extends Database<P>>

Parameters:

database - a database descriptor

See Also:

AbstractSetBalancer.removed(net.sf.hajdbc.Database)

cleared

protected void cleared()

Called when the set was cleared.

Specified by:

cleared in class AbstractSetBalancer<P,D extends Database<P>>

See Also:

AbstractSetBalancer.cleared()