Configuration Database CDB - 6th ACS Workshop at UTFSM 2009
Configuration Database CDB - 6th ACS Workshop at UTFSM 2009
Configuration Database CDB - 6th ACS Workshop at UTFSM 2009
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<strong>Configur<strong>at</strong>ion</strong><br />
<strong>D<strong>at</strong>abase</strong><br />
<strong>CDB</strong><br />
Bogdan Jeram<br />
(bjeram@eso.org)<br />
European Southern Observ<strong>at</strong>ory
ALMA Project<br />
<strong>CDB</strong>: the purpose<br />
• configuring of a system:<br />
– deployment info of the system (where, wh<strong>at</strong>)<br />
– <strong>Configur<strong>at</strong>ion</strong> for manager(s) and containers (how)<br />
– Component specific d<strong>at</strong>a - characteristic<br />
• each Component in the system might have (quasi)<br />
st<strong>at</strong>ic configur<strong>at</strong>ion parameters th<strong>at</strong> have to be<br />
configured in a persistent store and read when the<br />
Component is started up or re-initialized.<br />
• CharacteristicComponents MUST have<br />
configur<strong>at</strong>ion inform<strong>at</strong>ion in the <strong>CDB</strong><br />
Garching, January 2007 ALMA Common Software course<br />
2
ALMA Project<br />
Configurable deployment<br />
• “structure” of the system, i.e. which st<strong>at</strong>ically<br />
deployed Components are part of the system and<br />
their inter-rel<strong>at</strong>ionships.<br />
– looking <strong>at</strong> the <strong>CDB</strong> only, you should be able to see how<br />
the Components are distributed among the Containers<br />
and on wh<strong>at</strong> hosts the Containers are running.<br />
– Changing the <strong>CDB</strong> you can move Components around<br />
and distribute them in a different way in the system.<br />
• dynamic components can be partially deployed in<br />
the <strong>CDB</strong> – the missing info gets added <strong>at</strong> runtime.<br />
Garching, January 2007 ALMA Common Software course<br />
3
ALMA Project<br />
• XSD schemas<br />
<strong>CDB</strong> organiz<strong>at</strong>ion<br />
• current: XML files organized in directory<br />
hierarchy<br />
• future: TM<strong>CDB</strong><br />
Garching, January <strong>2009</strong> ALMA Common Software course<br />
4
ALMA Project<br />
• <strong>CDB</strong> (root)<br />
D<strong>at</strong>a organiz<strong>at</strong>ion<br />
(directory hierarchy)<br />
– MACI (system deployment d<strong>at</strong>a)<br />
• Managers<br />
• Containers<br />
• Components (just component deployment d<strong>at</strong>a)<br />
• Channels<br />
– alma (characteristic component specific d<strong>at</strong>a)<br />
– alarm (optional for alarms)<br />
Garching, January 2007 ALMA Common Software course<br />
5
<strong>CDB</strong><br />
ALMA Project<br />
<strong>CDB</strong>/MACI structure<br />
MACI Managers<br />
alma<br />
schemas<br />
Components<br />
Garching, January 2007 ALMA Common Software course<br />
Manager<br />
Containers myCont1<br />
myComp<br />
yourComp<br />
anotherComp<br />
yourCont<br />
6
ALMA Project<br />
Structure of Components<br />
deployment d<strong>at</strong>a (Components.xsd)<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
Garching, January 2007 ALMA Common Software course<br />
7
ALMA Project<br />
Loc<strong>at</strong>ion of components deployment<br />
info (Components.xml)<br />
• $<strong>ACS</strong>_<strong>CDB</strong><br />
• <strong>CDB</strong>/MACI/Components/Components.xml<br />
Garching, January 2007 ALMA Common Software course<br />
8
ALMA Project<br />
MACI/Components/Components.xml<br />
List of component instances<br />
<br />
ALMA Project<br />
Altern<strong>at</strong>ives to a single large<br />
Components.xml file<br />
• Several such files (same structure each) can be included in the master file<br />
Components.xml using an XML include mechanism as in<br />
ALMA Project<br />
Structure of Manager d<strong>at</strong>a<br />
(Manager.xsd)<br />
<br />
<br />
<br />
ALMA Project<br />
• $<strong>ACS</strong>_<strong>CDB</strong><br />
Manager instance file loc<strong>at</strong>ion<br />
• <strong>CDB</strong>/MACI/Managers/Manager/Manager.xml<br />
Garching, January 2007 ALMA Common Software course<br />
12
ALMA Project<br />
Manager instance example<br />
(Manager.xml)<br />
ALMA Project<br />
Structure of Container d<strong>at</strong>a<br />
(Container.xsd)<br />
DALtype<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
Garching, January 2007 ALMA Common Software course<br />
14
ALMA Project<br />
• $<strong>ACS</strong>_<strong>CDB</strong><br />
Container instance file loc<strong>at</strong>ion<br />
• <strong>CDB</strong>/MACI/Containers/<br />
/.xml<br />
• Example:<br />
<strong>CDB</strong>/MACI/Containers/myContainer/myCo<br />
ntainer.xml<br />
Garching, January 2007 ALMA Common Software course<br />
15
ALMA Project<br />
Container Instance<br />
(XML file)<br />
Loading Steps<br />
ALMA Project<br />
Client<br />
Manager<br />
Manager.xml<br />
Components.xml<br />
Container(C++)<br />
“bilboContainer”<br />
Manager.xml bilboContainer.xml<br />
Garching, January 2007 ALMA Common Software course<br />
X<br />
Container(java)<br />
“frodoContainer”<br />
Y frodoContainer.xml<br />
17
ALMA Project<br />
parent directory<br />
File1.xml<br />
<strong>CDB</strong> D<strong>at</strong>a Retrieval<br />
XML d<strong>at</strong>a mapped to D<strong>at</strong>a Access Objects (DAOs)<br />
FILES NODES<br />
child directory1<br />
File2.xml<br />
child directory2<br />
File3.xml<br />
File4.xml<br />
<strong>CDB</strong> D<strong>at</strong>a Access<br />
Layer (DAL) Server<br />
get “parent”<br />
DAO<br />
“File1”,<br />
“File2”,<br />
“File3”,<br />
“File4”<br />
Garching, January 2007 ALMA Common Software course<br />
Client (Container<br />
or Component)<br />
get “parent/child1”<br />
DAO<br />
“File2”<br />
18
Remote<br />
object<br />
for d<strong>at</strong>a<br />
field<br />
retrieval<br />
ALMA Project<br />
DAL server implements DAL IDL:<br />
DAL Server<br />
interface DAL {<br />
string get_DAO( in string curl )<br />
raises (RecordDoesNotExist,XMLerror);<br />
};<br />
DAO get_DAO_Servant( in string curl )<br />
XML string for<br />
local processing<br />
raises (RecordDoesNotExist,XMLerror);<br />
oneway void shutdown();<br />
//d<strong>at</strong>a change handling<br />
long add_change_listener( in DALChangeListener listener );<br />
void listen_for_changes( in string curl, in long listenerID );<br />
void remove_change_listener( in long listenerID );<br />
// listing<br />
string list_nodes( in string name );<br />
Garching, January 2007 ALMA Common Software course<br />
19
ALMA Project<br />
DAO IDL<br />
interface DAO {<br />
long get_long( in string propertyName )<br />
raises (WrongD<strong>at</strong>aType, FieldDoesNotExist);<br />
double get_double( in string propertyName )<br />
raises (WrongD<strong>at</strong>aType, FieldDoesNotExist);<br />
string get_string( in string propertyName )<br />
};<br />
raises (WrongD<strong>at</strong>aType, FieldDoesNotExist);<br />
string get_field_d<strong>at</strong>a( in string propertyName )<br />
raises (WrongD<strong>at</strong>aType, FieldDoesNotExist);<br />
stringSeq get_string_seq( in string propertyName )<br />
raises (WrongD<strong>at</strong>aType, FieldDoesNotExist);<br />
longSeq get_long_seq( in string propertyName )<br />
raises (WrongD<strong>at</strong>aType, FieldDoesNotExist);<br />
doubleSeq get_double_seq( in string propertyName)<br />
raises (WrongD<strong>at</strong>aType, FieldDoesNotExist);<br />
Garching, January 2007 ALMA Common Software course<br />
20
ALMA Project<br />
Component retrieves d<strong>at</strong>a from<br />
C++<br />
MyComponent::mymethod(….)<br />
{<br />
try {<br />
<strong>CDB</strong>::DAL_ptr dal_p = getContainerServices()->get<strong>CDB</strong>();<br />
<strong>CDB</strong>::DAO_ptr dao_p = dal_p->get_DAO_Servant(curl);<br />
description = dao_p->get_string( "description" );<br />
m_units = dao_p->get_string( "units" );<br />
m_min_step = dao_p->get_double( "minStep" );<br />
}<br />
c<strong>at</strong>ch( <strong>ACS</strong>ERR::<strong>ACS</strong>baseExImpl &ex ) {<br />
ReportError( m_name, "Unable to read configur<strong>at</strong>ion!"<br />
);<br />
return false;<br />
}<br />
}<br />
Garching, January 2007 ALMA Common Software course<br />
21
ALMA Project<br />
DAL navig<strong>at</strong>ion interface<br />
• Retrieve the list of all children of the given node to allow<br />
navig<strong>at</strong>ion of the <strong>CDB</strong> hierarchical structure:<br />
interface DAL {<br />
};<br />
string list_nodes( in string name );<br />
• This allows an applic<strong>at</strong>ion to discover the <strong>CDB</strong> structure.<br />
Is essential to build a <strong>CDB</strong> generic browser<br />
Garching, January 2007 ALMA Common Software course<br />
22
ALMA Project<br />
Default <strong>CDB</strong><br />
• jDAL (Java implement<strong>at</strong>ion of <strong>CDB</strong>)<br />
started as part of acsStartORBSRVC<br />
• $<strong>ACS</strong>_<strong>CDB</strong> points to <strong>CDB</strong> entry point<br />
• Default file loc<strong>at</strong>ion:<br />
$<strong>ACS</strong>DATA/config/default<strong>CDB</strong><br />
• Test configur<strong>at</strong>ion d<strong>at</strong>a:<br />
test/<strong>CDB</strong><br />
Garching, January 2007 ALMA Common Software course<br />
23
ALMA Project<br />
<strong>CDB</strong> Browser<br />
Garching, January 2007 ALMA Common Software course<br />
24
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