Class Finalizer

  extended by java.lang.Thread
      extended by
All Implemented Interfaces:

public class Finalizer
extends Thread

Thread that finalizes referents. All references should implement

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. 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.

Nested Class Summary
Nested classes/interfaces inherited from class java.lang.Thread
Thread.State, Thread.UncaughtExceptionHandler
Field Summary
Fields inherited from class java.lang.Thread
Method Summary
static Field getInheritableThreadLocalsField()
 void run()
          Loops continuously, pulling references off the queue and cleaning them up.
static ReferenceQueue<Object> startFinalizer(Class<?> finalizableReferenceClass, Object frq)
          Starts the Finalizer thread.
Methods inherited from class java.lang.Thread
activeCount, checkAccess, clone, countStackFrames, currentThread, destroy, dumpStack, enumerate, getAllStackTraces, getContextClassLoader, getDefaultUncaughtExceptionHandler, getId, getName, getPriority, getStackTrace, getState, getThreadGroup, getUncaughtExceptionHandler, googleGetContext0, googleSetContext0, holdsLock, interrupt, interrupted, isAlive, isDaemon, isInterrupted, join, join, join, resume, setContextClassLoader, setDaemon, setDefaultUncaughtExceptionHandler, setName, setPriority, setUncaughtExceptionHandler, sleep, sleep, start, stop, stop, suspend, toString, yield
Methods inherited from class java.lang.Object
equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Method Detail


public static ReferenceQueue<Object> startFinalizer(Class<?> finalizableReferenceClass,
                                                    Object frq)
Starts the Finalizer thread. FinalizableReferenceQueue calls this method reflectively.

finalizableReferenceClass - FinalizableReference.class
frq - reference to instance of FinalizableReferenceQueue that started this thread
ReferenceQueue which Finalizer will poll


public void run()
Loops continuously, pulling references off the queue and cleaning them up.

Specified by:
run in interface Runnable
run in class Thread
See Also:
Thread.start(), Thread.stop(), Thread.Thread(ThreadGroup, Runnable, String)


public static Field getInheritableThreadLocalsField()