Multiple-Tier Architecture
The multiple-tier architecture is a true enterprise-caliber solution (Figure 4-3). By breaking out the EJBs onto their own dedicated servers, you incrementally increase the availability and performance of the cluster as a whole. The architecture is reliable, scalable, and complicated to administer.
In order to take advantage of multiple-tier architecture, your EJB application must be designed with replica-aware stubs. The actual implementation of these stubs is outside the scope of this book. However, for purposes of this discussion, it's worth providing a brief background description. (Also see the discussion on EJBs in the Introduction.)
Replica-Aware Stubs
To the caller, a replica-aware stub appears to be a normal ...
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