persistent mediators

[Khurram Masood]

Hi
 
Are mediators in Synapse (custom or default) persistent or do they get
called by synapse and then die. How can I attach a data structure with a
mediator that is persistent all the time. Because I want the data-structure
to be constructed once and be alive all the time with the mediator
 
 
Regards
 
Khurram.