B2B Integration : A Practical Guide to Collaborative E-commerce

218 B2B Integration — A Practical Guide to Collaborative E-commerce
• Resource Managers — the component which manages shared
resources. They are responsible for ensuring that changes to the
datastore are executed in a consistent, isolated and durable manner.
• Transaction Managers — the component which is responsible for
managing and coordinating resource managers and coordinating a
transaction with other transaction managers.
• Application Programs — the application which uses the resource
manager to coordinate and manage its transactional needs.
8.2.2. Benefits of TP monitors
The benefits of the TP monitors include:
Three-tier architecture
TP monitors support the concept of n-tier architectures by decoupling
the client application from the underlying datastore. They promote the
use of reusable, encapsulated components and enforce the ACID
properties of each transaction.
Prioritization
Each application can have one or more classes belonging to it. Each
class can also be prioritized. Typically, short-running, high-priority
processes are assigned a high priority status while batch and lowpriority
processes are assigned a lower priority status on the server.
Load balancing
One of the biggest benefits of TP monitors is the ability to provide both
static and dynamic load balancing. If the load on the server becomes
too great, a TP monitor can dynamically create new processes or
distribute the load to other servers. TP monitors can also make effective
use of a multi-processor (SMP) machine.
All major database vendors provide some TP monitor capabilities
within their flagship databases, but these transaction monitors generally