<s>
The	O
3G	B-Device
Bridge	I-Device
used	O
within	O
the	O
EDGeS	O
project	O
that	O
provides	O
the	O
core	O
component	O
of	O
the	O
Service	O
Grid	O
-	O
Desktop	O
Grid	O
interoperability	O
solution	O
.	O
</s>
<s>
3G	B-Device
Bridge	I-Device
helps	O
to	O
connect	O
user	O
communities	O
of	O
different	O
grid	O
systems	O
.	O
</s>
<s>
For	O
example	O
,	O
communities	O
working	O
on	O
parameter	O
sweep	O
problems	O
(	O
physics	O
,	O
biologists	O
,	O
...	O
)	O
and	O
using	O
service	O
grid	O
infrastructures	O
can	O
migrate	O
their	O
applications	O
to	O
the	O
more	O
adequate	O
desktop	O
grid	O
platform	O
using	O
the	O
3G	B-Device
Bridge	I-Device
technology	O
,	O
resulting	O
in	O
an	O
accelerated	O
research	O
.	O
</s>
<s>
Zoltan	O
Farkas	O
,	O
research	O
leader	O
of	O
LPDS	B-Operating_System
at	O
MTA-SZTAKI	O
,	O
Hungary	O
.	O
</s>
<s>
3G	B-Device
Bridge	I-Device
is	O
currently	O
actively	O
used	O
in	O
the	O
EDGI	O
and	O
DEGSICO	O
projects	O
as	O
the	O
job	O
bridging	O
technology	O
between	O
service	O
and	O
desktop	O
grids	O
.	O
</s>
<s>
3G	B-Device
Bridge	I-Device
enables	O
interconnecting	O
different	O
grid	O
technologies	O
by	O
migrating	O
jobs	O
between	O
them	O
.	O
</s>
<s>
The	O
3G	B-Device
Bridge	I-Device
has	O
the	O
following	O
main	O
components	O
:	O
</s>
<s>
•	O
Job	O
Handler	O
Interface	O
:	O
this	O
is	O
a	O
very	O
simple	O
MySQL	B-Application
interface	O
for	O
handling	O
jobs	O
in	O
the	O
3G	B-Device
Bridge	I-Device
Job	O
Database	O
.	O
</s>
<s>
Can	O
be	O
used	O
by	O
local	O
MySQL	B-Application
clients	O
,	O
or	O
a	O
very	O
simple	O
application	O
shipped	O
with	O
the	O
3G	B-Device
Bridge	I-Device
called	O
'	O
injector	O
 '	O
.	O
</s>
<s>
•	O
WSSubmitter	O
:	O
this	O
is	O
a	O
Web	O
Service	O
interface	O
above	O
the	O
3G	B-Device
Bridge	I-Device
Job	O
Database	O
.	O
</s>
<s>
Using	O
this	O
interface	O
,	O
remote	O
clients	O
can	O
add	O
jobs	O
to	O
the	O
3G	B-Device
Bridge	I-Device
for	O
execution	O
,	O
or	O
check	O
the	O
status	O
of	O
already	O
submitted	O
ones	O
.	O
</s>
<s>
•	O
3G	B-Device
Bridge	I-Device
Job	O
Database	O
:	O
this	O
is	O
a	O
MySQL	B-Application
database	O
that	O
contains	O
the	O
set	O
of	O
jobs	O
the	O
3G	B-Device
Bridge	I-Device
should	O
handle	O
.	O
</s>
<s>
•	O
Queue	O
Manager	O
:	O
this	O
component	O
arranges	O
the	O
execution	O
and	O
management	O
of	O
3G	B-Device
Bridge	I-Device
jobs	O
,	O
periodically	O
calls	O
the	O
different	O
grid	O
plugins	O
in	O
order	O
to	O
manage	O
jobs	O
assigned	O
to	O
them	O
.	O
</s>
<s>
By	O
using	O
this	O
generic	O
layer	O
,	O
no	O
3G	B-Device
Bridge	I-Device
components	O
other	O
than	O
the	O
grid	O
plugins	O
must	O
contain	O
grid-specific	O
code	O
.	O
</s>
<s>
The	O
3G	B-Device
Bridge	I-Device
supports	O
the	O
following	O
grids	O
:	O
EGEE	O
,	O
BOINC	B-Operating_System
,	O
XtremWeb-HEP	O
,	O
and	O
OurGrid	O
.	O
</s>
<s>
•	O
HTTPD	O
:	O
is	O
a	O
web	O
server	O
so	O
remote	O
clients	O
can	O
fetch	O
output	O
files	O
of	O
finished	O
jobs	O
from	O
the	O
3G	B-Device
Bridge	I-Device
server	O
.	O
</s>
<s>
The	O
main	O
programming	O
language	O
is	O
C++	O
,	O
however	O
3G	B-Device
Bridge	I-Device
supports	O
implementing	O
grid	O
plugins	O
in	O
Java	O
.	O
</s>
<s>
DC-API-Single	O
:	O
this	O
plugin	O
can	O
be	O
used	O
to	O
submit	O
individual	O
jobs	O
to	O
a	O
BOINC-based	O
desktop	O
grid	O
.	O
</s>
<s>
DC-API	O
:	O
this	O
plugin	O
is	O
an	O
enhanced	O
version	O
of	O
the	O
DC-API-Single	O
plugin	O
,	O
capable	O
of	O
submitting	O
job	O
batches	O
to	O
the	O
BOINC	B-Operating_System
server	O
.	O
</s>
<s>
EGEE	O
:	O
the	O
EGEE	O
plugin	O
can	O
be	O
used	O
to	O
submit	O
jobs	O
to	O
gLite-based	O
service	O
grids	O
.	O
</s>
<s>
This	O
plugin	O
is	O
extensively	O
used	O
within	O
the	O
DEGISCO	O
project	O
,	O
solving	O
bridging	O
BOINC	B-Operating_System
workunits	O
to	O
gLite	B-Operating_System
.	O
</s>
<s>
BES	O
:	O
the	O
BES	O
plugin	O
can	O
be	O
used	O
to	O
submit	O
jobs	O
to	O
OGSA	O
BES	O
resources	O
,	O
like	O
ARC	B-Operating_System
or	O
UNICORE	B-General_Concept
.	O
</s>
