// attempt to issue 100 concurrent requests to myservice
for (int i=0; i<100; i++)
{
req=context.createSubRequest("active:throttle");
req.addArgument("id","throttle:my_throttle");
req.addArgument("uri","ffcpl:/myservice");
context.issueAsyncSubRequest(req);
}
Purpose
The throttle accessor can act as a
wrapper around other services and will limit the number of concurrent requests
those services will receive simultaneously.
The
throttle will queue requests when the number of concurrent requests
exceeds the limit
specified by the concurrency parameter.
When the service finishes processing a request, the throttle will
send a queued request to the service.
If the configurable queue size limit is exceeded then
an "Throttle Overload" exception is thrown
and the service will never be invoked for that request.
Throttle ID
A globally unique throttle ID must be assigned to each unique instance of a
logical throttle.
If multiple clients
use the same throttle id then their requests will share the same throttle
even if their requests are targeted at different services - this may
sometimes be desirable.
Configuration
The following configuration parameters must be supplied to the throttle
in the form of an XML document:
Preface
Accessor Listing
ASpell Spell Checker
