public static synchronized int getOpenFileCount(RepositoryHandleImpl owner) {
		List<RemoteBufferFileImpl> list = instanceOwnerMap.get(owner);
		if (list != null) {
			return list.size();
		}
		return 0;
	}
Get the number of open RemoteBufferFileHandle's associated with the 
specified owner repository handle. 
@param owner owner's repository handle
@return number of open remote buffer file handles associated with owner
Ghidra/Features/GhidraServer/src/main/java/db/buffers/RemoteBufferFileImpl.java