Method startFinalizer

output/java_guava/1.4.16/Finalizer.java:61–92

Starts the Finalizer thread. FinalizableReferenceQueue calls this method reflectively. @param finalizableReferenceClass FinalizableReference.class. @param queue a reference queue that the thread will poll. @param frqReference a phantom reference to the FinalizableReferenceQueue, which will be queue

(
    Class<?> finalizableReferenceClass,
    ReferenceQueue<Object> queue,
    PhantomReference<Object> frqReference)

   *     close() method is called.
   */
  public static void startFinalizer(
    Class<?> finalizableReferenceClass,
    ReferenceQueue<Object> queue,
    PhantomReference<Object> frqReference) {
    /*
     * We use FinalizableReference.class for two things:
     *
     * 1) To invoke FinalizableReference.finalizeReferent()
     *
     * 2) To detect when FinalizableReference's class loader has to be garbage collected, at which
     * point, Finalizer can stop running
     */
    if (!finalizableReferenceClass.getName().equals(FINALIZABLE_REFERENCE)) {
      throw new IllegalArgumentException("Expected " + FINALIZABLE_REFERENCE + ".");
    }

    Finalizer finalizer = new Finalizer(finalizableReferenceClass, queue, frqReference);
    Thread thread = new Thread(finalizer);
    thread.setName(Finalizer.class.getName());
    thread.setDaemon(true);
    try {
      if (inheritableThreadLocals != null) {
        inheritableThreadLocals.set(thread, null);
      }
    } catch (Throwable t) {
      logger.log(
          Level.INFO,
          "Failed to clear thread local values inherited by reference finalizer thread.",
          t);
    }
    thread.start();
  }

  private final WeakReference<Class<?>> finalizableReferenceClassReference;
  private final PhantomReference<Object> frqReference;