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HowItWorks.md

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How this extension works

This extension is composed of a set of C++ classes and a ROOT plugin for the TFile class.

The compilation and link process of the C++ classes composing this extension produces a shared object library. This library is dynamically loaded by ROOT at runtime when it needs to open a file which name matches one of the schemes handled by this extension (e.g s3:// or swift://). The plugin file tells the ROOT runtime what schemes are handled by this extension and what dynamic libraries it needs to load read the specified remote file.

See How to Use section provide details on what file naming schemes are supported by this extension.

Supported versions of ROOT

We have tested this extension with several versions of ROOT since v5.24/00 (released on October 2009) up to version 5.34/23. ROOT versions prior to v5.24.00 may work as well but we have not tested. This extension also works with ROOT v6 master.

Supported cloud storage service providers

The service providers we tested this extension against are:

  • Amazon S3
  • Google Storage
  • Rackspace
  • Self-hosted OpenStack Swift
  • Plain HTTP(S) server

Supported operating systems

We have tested this extension with the operating systems below:

  • MacOS X v10.7, v10.8, v10.9
  • Scientific Linux v5 and v6
  • Ubuntu Linux v14.04

It is very likely that this extension also works on other operating systems where ROOT itself and the dependencies of this package (see below) are supported.