Create a WCF service hosted in IIS7 alive between request?

Question

How can I keep a WCF service alive between requests? The service is creating a simple cache in memory on initialisation and I dont want the service to have to re-initialise between requests. The cache is built up using data extracted from a database and so for efficiency i only need this to be done rarely.
The database is not going to be updated often and so recycling the app pool every night will suffice in terms of updating the cache.

Answer 1

You are asking two questions. If you need service instance alive between requests you should check InstanceContextMode set to PerSession or Single. If you need application initialization to prepare your shared cache you should check IIS 7.5 Warm-up module and place your initialization to Application_Start in Global.asax. For older versions of IIS you have to write some application (console is enough) which will be scheduled to call your web application / service and warm it up.