ninja.activeproxy.path
Class PathInstantiator
java.lang.Object
|
+--ninja.activeproxy.path.PathInstantiator
- public class PathInstantiator
- extends java.lang.Object
The PathInstantiator is responsible for taking a logical path (operators
without specific machines to run on) and converting it to a physical path by
choosing specific machines for the operators to run on.
To do (11.19.99)
- No failure recovery built in -- if an operator which the SDS say is available doesn't
respond to rmi calls, we don't do anything. We should try to reinstantiate this operator, perhaps
Update 1.17.00 SRM
- Failure detection is handled by the io/PathInputStream and PathOutputStream stream wrappers.
Failures at the instantiation level simply throw exceptions which the caller is expected to
handle.
| Methods inherited from class java.lang.Object |
,
clone,
equals,
finalize,
getClass,
hashCode,
notify,
notifyAll,
registerNatives,
toString,
wait,
wait,
wait |
PathInstantiator
public PathInstantiator()
instantiatePath
public static PathDescription instantiatePath(PathDescription path)
- Instantiate the specified PathDescription with running instances
of operators found via SDS.
We will preserve the runtime object of any already instantiated operators
For now, just use SDS directory to find operators -- eventually,
maybe we want to switch to a Xset based system?
Limitations:
- We don't notify Xset/SDS when an operator which was registered doesn't respond
- We don't rebuild the path if a registered operator doesn't respond
- Parameters:
path - The logical path to be instantiated- Returns:
- The instantiated path, returns null if the path can't be instantiated
instantiateOperator
public static OperatorDescription instantiateOperator(OperatorDescription op)
- Instantiate one operator
Finds available operators via SDS, not Xset (should be changed?)
Overwrites any currently installed runtime structure in op.
This can be used to reinstantiate a single element of a path.
- Parameters:
op - The operator to instantiate- Returns:
- The instantiated operator, or null if instantiation failed
instantiateOpRandom
private static boolean instantiateOpRandom(OperatorDescription op,
java.util.Random r)