Class Finalizer
- All Implemented Interfaces:
Runnable
com.google.common.base.FinalizableReference
.
While this class is public, we consider it to be *internal* and not part of our published API. It is public so we can access it reflectively across class loaders in secure environments.
This class can't depend on other Google Collections code. If we were to load this class in the same class loader as the rest of Google Collections, this thread would keep an indirect strong reference to the class loader and prevent it from being garbage collected. This poses a problem for environments where you want to throw away the class loader. For example, dynamically reloading a web application or unloading an OSGi bundle.
com.google.common.base.FinalizableReferenceQueue
loads this class
in its own class loader. That way, this class doesn't prevent the main
class loader from getting garbage collected, and this class can detect when
the main class loader has been garbage collected and stop itself.
-
Field Summary
FieldsModifier and TypeFieldDescriptionprivate static final String
Name of FinalizableReference.class.private final WeakReference<Class<?>>
private final PhantomReference<Object>
private static final Field
private static final Constructor<Thread>
private static final Logger
private final ReferenceQueue<Object>
private Thread
-
Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionprivate boolean
Cleans up a single reference.private Method
Looks up FinalizableReference.finalizeReferent() method.static Constructor<Thread>
static Field
void
run()
Loops continuously, pulling references off the queue and cleaning them up.void
start()
static ReferenceQueue<Object>
startFinalizer
(Class<?> finalizableReferenceClass, Object frq) Starts the Finalizer thread.
-
Field Details
-
logger
-
FINALIZABLE_REFERENCE
Name of FinalizableReference.class.- See Also:
-
thread
-
finalizableReferenceClassReference
-
frqReference
-
queue
-
inheritableThreadLocals
-
inheritableThreadlocalsConstructor
-
-
Constructor Details
-
Finalizer
Constructs a new finalizer thread.
-
-
Method Details
-
startFinalizer
Starts the Finalizer thread. FinalizableReferenceQueue calls this method reflectively.- Parameters:
finalizableReferenceClass
- FinalizableReference.classfrq
- reference to instance of FinalizableReferenceQueue that started this thread- Returns:
- ReferenceQueue which Finalizer will poll
-
start
public void start() -
run
public void run()Loops continuously, pulling references off the queue and cleaning them up. -
cleanUp
Cleans up a single reference. Catches and logs all throwables. -
getFinalizeReferentMethod
Looks up FinalizableReference.finalizeReferent() method. -
getInheritableThreadLocalsField
-
getInheritableThreadLocalsConstructor
-