@Override public void clear() throws StorageException { final StubIndexImpl stubIndex = StubIndexImpl.getInstanceOrInvalidate(); final Collection<StubIndexKey> allStubIndexKeys = stubIndex != null ? stubIndex.getAllStubIndexKeys() : Collections.<StubIndexKey>emptyList(); try { for (StubIndexKey key : allStubIndexKeys) { //noinspection ConstantConditions stubIndex.getWriteLock(key).lock(); } getWriteLock().lock(); if (stubIndex != null) { stubIndex.clearAllIndices(); } super.clear(); } finally { getWriteLock().unlock(); for (StubIndexKey key : allStubIndexKeys) { //noinspection ConstantConditions stubIndex.getWriteLock(key).unlock(); } } }