|
||||||||||
PREV CLASS NEXT CLASS | FRAMES NO FRAMES | |||||||||
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |
java.lang.Objectorg.apache.mahout.cf.taste.impl.common.RefreshHelper
public final class RefreshHelper
A helper class for implementing Refreshable
. This object is typically included in an implementation
Refreshable
to implement Refreshable.refresh(Collection)
. It execute the class's own
supplied update logic, after updating all the object's dependencies. This also ensures that dependencies
are not updated multiple times.
Constructor Summary | |
---|---|
RefreshHelper(Callable<?> refreshRunnable)
|
Method Summary | |
---|---|
void |
addDependency(Refreshable refreshable)
Add a dependency to be refreshed first when the encapsulating object does. |
static Collection<Refreshable> |
buildRefreshed(Collection<Refreshable> currentAlreadyRefreshed)
Creates a new and empty Collection if the method parameter is null . |
static void |
maybeRefresh(Collection<Refreshable> alreadyRefreshed,
Refreshable refreshable)
Adds the specified Refreshable to the given collection of Refreshable s if it is not
already there and immediately refreshes it. |
void |
refresh(Collection<Refreshable> alreadyRefreshed)
Typically this is called in Refreshable.refresh(java.util.Collection) and is the entire body of
that method. |
void |
removeDependency(Refreshable refreshable)
|
Methods inherited from class java.lang.Object |
---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
---|
public RefreshHelper(Callable<?> refreshRunnable)
refreshRunnable
- encapsulates the containing object's own refresh logicMethod Detail |
---|
public void addDependency(Refreshable refreshable)
public void removeDependency(Refreshable refreshable)
public void refresh(Collection<Refreshable> alreadyRefreshed)
Refreshable.refresh(java.util.Collection)
and is the entire body of
that method.
refresh
in interface Refreshable
alreadyRefreshed
- Refreshable
s that are known to have already been
refreshed as a result of an initial call to a Refreshable.refresh(Collection)
method on some
object. This ensure that objects in a refresh dependency graph aren't refreshed twice
needlessly.public static Collection<Refreshable> buildRefreshed(Collection<Refreshable> currentAlreadyRefreshed)
Collection
if the method parameter is null
.
currentAlreadyRefreshed
- Refreshable
s to refresh later on
Collection
if the method param was null
or the unmodified method
param.public static void maybeRefresh(Collection<Refreshable> alreadyRefreshed, Refreshable refreshable)
Refreshable
to the given collection of Refreshable
s if it is not
already there and immediately refreshes it.
alreadyRefreshed
- the collection of Refreshable
srefreshable
- the Refreshable
to potentially add and refresh
|
||||||||||
PREV CLASS NEXT CLASS | FRAMES NO FRAMES | |||||||||
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |