Gary Kumfert & Scott Kohn Tammy Dahlgren, Tom Epperly, Steve Smith, and Bill Bosl
description
Transcript of Gary Kumfert & Scott Kohn Tammy Dahlgren, Tom Epperly, Steve Smith, and Bill Bosl
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Gary Kumfert & Scott KohnTammy Dahlgren, Tom Epperly,
Steve Smith, and Bill Bosl
Introducing...
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GKK 2CASC
What is Decaf?
A CCA framework. 100% v-0.5 compliant Supports “Hello World!” components
Not a competitor with CCAT or CCAFFIENE
Also thought of calling it “mouse” Implemented using Babel
Proof of Babel’s applicability in CCA research vehicle for us to grok CCA distributed as example in 0.6.0 release
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GKK 3CASC
Outline
High Level Discussioncca.sidl & decaf.sidl in detailImplementing the frameworkImplementing “Hello World”Feedback into the CCA
Highlight Babel’s strengths and weaknesses
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GKK 4CASC
High Level Discussion
cca.sidl from cca-forum.orgdecaf.sidl by handFramework in C++“Hello World” component in F77Printf component in CDrivers in F77, Python & Java
Gary didin 2 days
Scott did in 3 days
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GKK 5CASC
Lines of Code (Decaf only)
cca.sidl (excl. comments) 28
decaf.sidl (excl. comments) 12
Generated C/C++ code (wc –l *) 22,067
Hand added Implementation 96
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GKK 6CASC
Biggest Time Consumers
Some Babel Bugfixes new tests added to regression suite Babel 0.6.0 or better required
Demystifying CCA Spec Lots of missing details How to create a component instance? How to bind a “uses port” to a
“provides port”? No main()! Due to GUI heritage?
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GKK 7CASC
HelloDriver.java (1/2)public class HelloDriver { public static void main(String args[]) {
decaf.Framework decaf = new decaf.Framework();
cca.ComponentID server = decaf.createInstance(
“HelloServer.Component”,“HelloServerInstance”);
cca.ComponentID client = decaf.createInstance(
“HelloClient.Component”,“HelloClientInstance”);
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GKK 8CASC
HelloDriver.java (2/2) decaf.connect( client, “HelloServer”,
server, “HelloServer”);
cca.Port port = decaf.lookupPort(client, “GoPort”);
cca.ports.GoPort go = (cca.ports.GoPort)port._cast(“cca.ports.GoPort”);
go.go();
decaf.destroyInstance( server ); decaf.destroyInstance( client ); } // end main} // end class
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GKK 9CASC
Outline
High Level Discussioncca.sidl & decaf.sidl in detailImplementing the frameworkImplementing “Hello World”Feedback into the CCA spec
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GKK 10CASC
Port – Key CCA Abstraction
// cca.sidlversion cca 0.5;package cca { interface Port { }
…
cca.s
idl
// decaf.sidlversion decaf 0.5;package decaf {
… decaf.
sid
l
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GKK 11CASC
PortInfo – Port MetaData
interface PortInfo { string getType();string getName();string getProperty( in string name );
}cca.s
idl
class PortInfo implements-all cca.PortInfo { void initialize(
in string name, in string type, in array<string> properties);
}decaf.
sid
l
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GKK 12CASC
Discussion
Is array<string> appropriate for properties??
Can implement richer data structures.Should Babel have a standard library?
class PortInfo implements-all cca.PortInfo { void initialize(
in string name, in string type, in array<string> properties);
}decaf.
sid
l
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GKK 13CASC
Component – Base Class for all CCA components
interface Component { void setServices(
in Services svcs);
}
cca.s
idl
decaf.
sid
l
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GKK 14CASC
ComponentID – handle to a component
interface ComponentID { string toString();}
cca.s
idl
class ComponentID implements-all cca.ComponentID {
void initialize( in string name );
}decaf.
sid
l
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GKK 15CASC
Services – component’s view of the world (1/3)
interface Services {
Port getPort( in string name );
Port getPortNonblocking( in string name );
void releasePort( in string name );
PortInfo createPortInfo(
in string name,
in string type,
in array<string> properties );
ComponentID getComponentID();
// …
cca.s
idl
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GKK 16CASC
Services – component’s view of the world (2/3)
interface Services {
// … continued
void registerUsesPort( in PortInfo pinfo );
void unregisterUsesPort( in string name );
void addProvidesPort( in Port inPort,
in PortInfo pinfo );
void removeProvidesPort( in string name );
}
cca.s
idl
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GKK 17CASC
Services – component’s view of the world (3/3)class Services implements-all cca.Services {
void bindPort( in string name, in cca.Port port );
cca.Port getProvidesPort( in string name );
void setComponentID( in cca.ComponentID cid );
}
decaf.
sid
l
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GKK 18CASC
Discussion
Components can only access cca.Services, BuildServices needs decaf.Services
If downcasting from cca.Services to decaf.Services, then the components are framework specific.
Evidence of underspecification? CCA spec needs to enumerate those
special components that are not portable and must be implemented by each framework.
!
?
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GKK 19CASC
Indispensable Ports (1/2)package ports { interface GoPort extends Port { int go (); } interface BuilderService extends Port { ComponentID createInstance(
in string className, in string requestedInstanceName );
void destroyInstance( in ComponentID toDie ); void connect( in ComponentID user,
in string usingPortName, in ComponentID provider, in string providingPortName);
}}
cca.s
idl
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GKK 20CASC
Indispensable Ports (2/2)
class Framework implements-all cca.ports.BuilderService {
cca.Port lookupPort( in cca.ComponentID id, in string portName );
}
decaf.
sid
l
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GKK 21CASC
Discussion
BuilderService is still under discussion and not formally addopted into the spec!
How did anyone build anything without create/connect/destroy functionality?
!
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GKK 22CASC
Outline
High Level Discussioncca.sidl & decaf.sidl in detailImplementing the frameworkImplementing “Hello World”Feedback into the CCA spec
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GKK 23CASC
Decaf Implementation Details
Used Babel’s C++ Bindings generated 22K lines of code
Hand edited 8 files added 96 lines of code by hand
PortInfo ComponentID
ServicesFramework
decaf_ _Impl.hhcc
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GKK 24CASC
decaf_PortInfo_Impl.hh
// DO-NOT-DELETE splicer.begin(decaf.PortInfo._includes)#include <map>// DO-NOT-DELETE splicer.end(decaf.PortInfo._includes)
namespace decaf { class PortInfo_Impl { private: //... // DO-NOT-DELETE splicer.begin(decaf.PortInfo._data) std::string d_name; std::string d_type; std::map<std::string, std::string> d_propertyMap; // DO-NOT-DELETE splicer.end(decaf.PortInfo._data)
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GKK 25CASC
decaf_PortInfo_Impl.cc
stringdecaf::PortInfo_impl::getProperty( /*in*/ string name ) throw (){// DO-NOT-DELETE splicer.begin(decaf.PortInfo.getProperty) return d_propertyMap[ name ];// DO-NOT-DELETE splicer.end(decaf.PortInfo.getProperty)}
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GKK 26CASC
cca::ComponentIDdecaf::Framework_impl::createInstance( /*in*/ string className, /*in*/ string requestedInstanceName )throw(){ // DO-NOT-DELETE splicer.begin(decaf.Framework.createInstance) SIDL::BaseClass sidl_class =
SIDL::Loader::createClass( className ); cca::Component component = sidl_class; decaf::ComponentID cid; if ( component._not_nil() ) { string uniqueName = getUniqueName( requestedInstanceName ); cid = decaf::ComponentID::_create(); cid.initialize( uniqueName ); decaf::Services svc = decaf::Services::_create(); svc.setComponentID( cid ); d_instance[ uniqueName ] = std::make_pair( component, svc ); component.setServices( svc ); } return cid; // DO-NOT-DELETE splicer.end(decaf.Framework.createInstance)}
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GKK 27CASC
Outline
High Level Discussioncca.sidl & decaf.sidl in detailImplementing the frameworkImplementing “Hello World”Feedback into the CCA spec
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GKK 28CASC
HelloWorld SIDL Files
version HelloServer 0.5;package HelloServer { interface HelloPort extends cca.Port { string sayHello(); } class Component implements-all
HelloPort, cca.Component {}}
serv
er.
sid
l
version HelloClient 0.5;package HelloClient { class Component implements-all cca.ports.GoPort, cca.Component {}}clien
t.sid
l
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GKK 29CASC
HelloServer_Component_Impl.f
subroutine HelloServer_Component_setServices_impl( & self, services) C ... call SIDL_string__array_create_f(1, 0, 0, properties) call cca_Services_createPortInfo_f( & services, & 'HelloServer', & 'HelloServer.HelloPort', & properties, & portinfo) call HelloServer_Component__cast_f(self, 'cca.Port', & port) call cca_Services_addProvidesPort_f(services, port, & portinfo) call cca_PortInfo_deleteReference_f(portinfo) call SIDL_string__array_destroy_f(properties)
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GKK 30CASC
HelloDriver.py (1/2)import decaf.Frameworkimport cca.ports.GoPort
if __name__ == ‘__main__’: decaf = decaf.Framework.Framework()
server = decaf.createInstance(“HelloServer.Component”,“HelloServerInstance”);
client = decaf.createInstance( “HelloClient.Component”,“HelloClientInstance”);
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GKK 31CASC
HelloDriver.py (2/2) decaf.connect(client,”HelloServer”,
server,”HelloServer”)
port = decaf.lookupPort(client, “GoPort”) go = cca.ports.GoPort.GoPort(port)
go.go()
decaf.destroyInstance(server) decaf.destroyInstance(client)
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GKK 32CASC
HelloDriver.py (1/2)import decaf.Frameworkimport cca.ports.GoPort
if __name__ == ‘__main__’: decaf = decaf.Framework.Framework()
server = decaf.createInstance(“HelloServer.Component”,“HelloServerInstance”);
client = decaf.createInstance( “HelloClient.Component”,“HelloClientInstance”);
What’s non-standard?
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GKK 33CASC
HelloDriver.py (2/2)
decaf.connect(client,”HelloServer”, server,”HelloServer”)
port = decaf.lookupPort(client, “GoPort”) go = cca.ports.GoPort.GoPort(port)
go.go()
decaf.destroyInstance(server) decaf.destroyInstance(client)
What’s non-standard?
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GKK 34CASC
Outline
High Level Discussioncca.sidl & decaf.sidl in detailImplementing the frameworkImplementing “Hello World”Feedback into the CCA spec
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GKK 35CASC
Feedback about CCA Spec
minimal to the point of being unusable cannot implement “Hello World! as is
doesn’t standardize driving from main() More people probably care about scripted
assembly than GUIs… and it scales better!
no create/bind/go/destroy in core spec Recommend a cca.Framework interface Recommend looking at Babel’s
SIDL::Loader
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GKK 36CASC
Babel is Ready for CCA
Demonstrated language independent CCA components.
Not necessarily Bug Free.Babel’s firewall between interface
and implementation forces better software design
Is CCA ready for Babel?
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GKK 37CASC
The End
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GKK 38CASC
Work performed under the auspices of the U. S. Department of Energy by the University of California, Lawrence Livermore National Laboratory under Contract W-7405-Eng-48
UCRL-PRES-145982 7 Nov 2001