Remote Storage Resource Management in WS-PGRADE/gUSE - Science Gateways for Distributed Computing Infrastructures - page 69

1. Data Avenue @SZTAKI is a public deployment of Data Avenue UI, hosted at
MTA SZTAKI, available as a public web page, where users can freely try out
Data Avenue services.
2. As of release 3.6.0, Data Avenue UI is part of the WS-PGRADE/gUSE portlet set;
this way, remote resources can also be managed from within the WS-PGRADE/
gUSE environment.
3. Data Avenue UI can be deployed in any portlet container and exploit Data
Avenue services through the Blacktop.
4. Using the Java API library provided for Data Avenue, Java applications can
easily use Data Avenue services.
5. Finally, applications written in programming languages other than Java can also
access Data Avenue services via standard web service calls, using the appro-
priate web service API library available in that environment.

first the user interface is presented, and then design
concepts of the Blacktop are described in more detail.

In the following sections,

5.2.1 Data Avenue User Interface

The graphical user interface of Data Avenue is implemented as a portlet, which can
be deployed in any portlet container (such as Liferay). It provides a web-based
interface for the users; in this way, the usage of Data Avenue services requires no
software installation other than a web-browser.
Data Avenue performs a uniform rendering of the

files and directory structure
regardless of the particular technology used by the remote storage resource we
browse. The interface layout (Fig. 5.2 ) is divided into two panels.
To access a storage, the user is only required to select the storage resource type
(protocol), specify its host (URL), and if necessary,

fill the authentication data,
called credentials , e.g., username-password, proxy, access key secret key.

(Optionally, the host name may be followed by an initial working path.) At the time
of this writing, storages accessible over HTTP, HTTPS, SFTP, GSIFTP, SRM, and
S3 are supported.
Once authenticated, the list of

-

files and subdirectory entries are listed on the
active panel (indicated by a lighter border line) along with details showing size and
last modi cation date information. The actual working path (URL) can be changed

by navigating into a subdirectory (double clicking on it), or to parent directory
(

files or
directories can be renamed ( Rename ) or deleted ( Delete ). Files can be uploaded
from the local disk ( Upload ), or downloaded to it ( Download ), respectively. The list
of directory contents can also be updated ( Refresh ).
To transfer

“ .. ” ), respectively. New subdirectories can be created ( Mkdir ), and any

files or directories from a source storage resource to a target storage
resource, one panel should be connected to the source storage, and the other to the
target one. After selecting a file or a directory on the source panel, it can be copied