Example #1
0
  /**
   * "pop" operation ends if destPage is found, if destPage is not found, the method call is a no-op
   *
   * @param destPage page as the destination for this pop operation
   * @param animated true to animate the transition
   */
  public void popToPage(
      Page destPage, boolean animated, PageAnimator.AnimationDirection animationDirection) {
    if (mAnimating) {
      return;
    }
    if (destPage == null) {
      throw new IllegalArgumentException("cannot call popToPage() with null destPage.");
    }

    if (mPageStack.size() <= 0
        || mPageStack.lastIndexOf(destPage) == -1
        || mPageStack.peekLast() == destPage) {
      return;
    }

    Page oldPage = mPageStack.removeLast();

    if (mEnableDebug) {
      Log.d(TAG, String.format(">>>> popPage, pagestack=%d, %s", mPageStack.size(), oldPage));
    }

    while (mPageStack.size() > 1) {
      if (mPageStack.peekLast() == destPage) {
        break;
      }

      Page page = mPageStack.removeLast();
      page.onHide();
      mContainerView.removeView(page.getView());
      page.onDetached();
      page.onHidden();
    }

    popPageInternal(oldPage, animated, animationDirection);
  }
  /**
   * Reports true if the path in question violates the happens before relation of pickups and drop
   * offs.
   *
   * @param path
   * @param pairs
   * @return
   */
  private boolean happensBeforeViolation(
      LinkedList<Vertex> path, ArrayList<ArrayList<Vertex>> pairs) {

    for (int i = 0; i < pairs.size(); i++) {

      Vertex pickup = pairs.get(i).get(0);
      Vertex dropoff = pairs.get(i).get(1);

      int pickupIndex = path.indexOf(pickup);
      int dropoffIndex = path.lastIndexOf(dropoff);

      if (dropoffIndex < pickupIndex) {

        return true;
      }
    }

    return false;
  }
 public int lastIndexOf(Object o) { //  Specified by: lastIndexOf in interface java.util.List
   return (linkedlist.lastIndexOf(o));
 }
Example #4
0
  /**
   * Releases the read lock held by the provided transaction. If it is null then an attempt to
   * acquire the current transaction will be made. This is to make safe calling the method from the
   * context of an <code>afterCompletion()</code> hook where the tx is locally stored and not
   * necessarily available through the tm. If there are waiting transactions in the queue they will
   * be interrupted if they can acquire the lock.
   */
  synchronized void releaseReadLock(Object tx) throws LockNotFoundException {
    TxLockElement tle = getLockElement(tx);

    if (tle.readCount == 0) {
      throw new LockNotFoundException("" + tx + " don't have readLock");
    }

    totalReadCount--;
    tle.readCount--;
    if (tle.isFree()) {
      txLockElementMap.remove(tx);
      ragManager.lockReleased(this, tx);
    }
    if (waitingThreadList.size() > 0) {
      WaitElement we = waitingThreadList.getLast();

      if (we.lockType == LockType.WRITE) {
        // this one is tricky...
        // if readCount > 0 we either have to find a waiting read lock
        // in the queue or a waiting write lock that has all read
        // locks, if none of these are found it means that there
        // is a (are) thread(s) that will release read lock(s) in the
        // near future...
        if (totalReadCount == we.element.readCount) {
          // found a write lock with all read locks
          waitingThreadList.removeLast();
          if (!we.element.movedOn) {
            we.waitingThread.interrupt();
          }
        } else {
          ListIterator<WaitElement> listItr =
              waitingThreadList.listIterator(waitingThreadList.lastIndexOf(we));
          // hm am I doing the first all over again?
          // think I am if cursor is at lastIndex + 0.5 oh well...
          while (listItr.hasPrevious()) {
            we = listItr.previous();
            if (we.lockType == LockType.WRITE && totalReadCount == we.element.readCount) {
              // found a write lock with all read locks
              listItr.remove();
              if (!we.element.movedOn) {
                we.waitingThread.interrupt();
                // ----
                break;
              }
            } else if (we.lockType == LockType.READ) {
              // found a read lock, let it do the job...
              listItr.remove();
              if (!we.element.movedOn) {
                we.waitingThread.interrupt();
              }
            }
          }
        }
      } else {
        // some thread may have the write lock and released a read lock
        // if writeCount is down to zero we can interrupt the waiting
        // read lock
        if (totalWriteCount == 0) {
          waitingThreadList.removeLast();
          if (!we.element.movedOn) {
            we.waitingThread.interrupt();
          }
        }
      }
    }
  }