Synchronization Dependencies
Synchronization values can be automatically determined or constrained by the configuration of other properties, such as transactional requirements and just-in-time (JIT) activation. For example, COM+ enforces synchronization both for transactional and for JIT-activated components.
These dependencies exist because components that are JIT-activated or participating in transactions must have proper isolation and concurrency behavior. Therefore, COM+ requires that access to these components be serialized by enforcing synchronization. (For details on these dependencies, see COM+ Just-in-Time Activation.)
The following tables show the characteristics of the COM+ synchronization attribute values.
Transactional requirement
| When transactions are set to | Synchronization can be set to |
|---|---|
| Disabled |
Anything, depending on JIT activation |
| Not Supported |
Anything, depending on JIT activation |
| Supported |
Required |
| Required |
Required |
| Requires New |
Required or Requires New |
JIT Activation
| When JIT Activation is set to | Synchronization can be set to |
|---|---|
| Enabled |
Required or Requires New |
| Disabled |
Anything |
For more detail about how transaction, JIT Activation, and Synchronization attributes behave together, see Configuring Transactions.