Whats about cache memories within the RfcAdapter?
The RfcAdapter has a cache for the metadata of function modules. This means it caches the definition of function modules, structures and other datatypes. A separate cache is used for each communication channel. When the particular data is needed during runtime, the cache is filled from the configured RFC metadata repository. Once if a particular metadata has entered the cache, only this one is used and no lookups to the RFC metadata repository are made for this type of metadata. If the communication channel is changed within the Integration Directory and gets replicated to the appropriate Adapter Engine (see Environment -> Cache Notifications…), this metadata cache is cleared. The caches for all communication channels are cleared when the J2EE Engine is restarted, the RfcAdapter J2EE Service ‘SAP XI Adapter: RFC’ is restarted or a dependend J2EE Service is restarted (‘SAP XI AF CPA Cache’, ‘SAP XI AF Messaging’)See also Q27.