Exploiting Multi-Tier Commodity Software Model
Essential idea is consider a three tier model
- Top tier is the client (in “Network Computer” based 4 tier architectures this becomes 2 tiers)
- Second tier are servers coordinated by commodity technologies such as the Web and CORBA and communicating via HTTP(Web), IIOP(CORBA), RMI or custom Java sockets.
- Use middle tier component/container model -- Enterprise Javabeans
- Third tier are services such as databases, MPP’s
Preserve the first two tiers as a high functionality commodity information processing system and confine HPCC to the third (lowest) tier.
- MPI becomes the high performance “machine code” for message passing which you use if HTTP, IIOP or RMI have insufficient performance