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A.3.1 Communication Server
Sentinel 6.1 Rapid Deployment's Apache ActiveMQ is an open source message broker. The
architecture is built around the Java Message Oriented Middleware (JMOM), which supports
asynchronous calls between the client and server applications. Message queues provide temporary
storage when the destination program is busy or not connected. MOM reduces the complexity of the
master-slave nature of the client/server mechanism.
ActiveMQ Message Bus
The ActiveMQ message bus allows for independent scaling of individual components while also
allowing for standards-based integration with external applications. The key to scalability is that,
unlike other distributed software, no two peer components communicate with each other directly.
All components communicate through the message bus, which is capable of moving thousands of
message packets per second.
Leveraging the unique features of the message bus, the high-throughput communication channel can
maximize and sustain a high data throughput rate across the independent components of the system.
Events are compressed and encrypted on the wire for secure and efficient delivery from the edge of
the network or collection points to the hub of the system, where real-time analytics are performed.
The ActiveMQ message bus employs a variety of queuing services that improve the reliability of the
communication beyond the security and performance aspects of the platform. Using a variety of
transient and durable queues, the system offers unparalleled reliability and fault tolerance. For
instance, important messages in transit are saved (by being queued) in case of a failure in the
communication path. The queued message is delivered to the destination after the system recovers
from the failure state.
Message Bus
Figure A-2
388 Sentinel 6.1 Rapid Deployment User Guide
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