MongoDB as a virtual file resource?

Robert_Munn · April 16, 2015, 3:32am

Is it possible to use a MongoDB store as a virtual file resource in Lucee? I read a note on this page:

with this info:

Since Railo 2.0, it is possible to use all different kinds of virtual file systems with all different kind of file related tags. Railo supports the following virtual file systems:

file (file:// or c:\ or /var/…)
ram (ram://)
Note that you can store the location for the RAM resource to any external cache or NoSQL key value store)
ftp (ftp://username:password@ftpserver/)
db (db://datasourcename:/)
http (http://fileLocation)
ZIP (zip://pathToFile!directory/file)
TAR (tar://pathToFile!directory/file)
TGZ (tgz://pathToFile!directory/file)
S3 (s3://secret:access@amazonaws.com/bucket)
I can’t find very much useful information about virtual file systems in Lucee or Railo. I’ve reviewed some posts about the s3 support, and here is some barebones information about two interfaces required to support a cfml-based virtual file system:

gist.github.com

https://gist.github.com/dajester2013/e22eb4044ed1af149741

RailoCFMLFileSystems.md

The following are the two interfaces needed to implement a cfml-based filesystem in Railo.

Steps:

1. Build implementations of the ResourceProvider and Resource interfaces
2. Add your ResourceProvider to the Railo config for the application you are working on:
  - `<resource-provider arguments="arg1:value1;arg2:value2" component="path.to.YourResourceProvider" scheme="yourscheme"/>`
  - Note: the arguments set in the above configuration are passed as a struct to the "args" argument in the ResourceProvider's constructor.

Resource.cfc

interface {

	public boolean function isReadable();
	
	public boolean function isWriteable();

	public void function remove(boolean force);

	public boolean function exists();

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ResourceProvider.cfc

interface {
	
	public ResourceProvider function init(String scheme, Struct args);

	public Resource function getResource(String path);

	public boolean function isCaseSensitive();

	public boolean function isModeSupported();

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I have done a cursory review of the Lucee Java source code for virtual file systems. It looks like more than a couple of days worth of work to implement a new ResourceProvider. Are other devs interested in this feature? I think it would be very useful as a way to work with binary files in MongoDB.

Robert