Adapter-Logic Application: a JGroups based integration framework

for heterogeneous environments

Flavio Bertini

Distributed Systems Seminars

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Roadmap1) Introduction to group communication

2) Group communication issues3) The JGroups solution

4) A case study: Adapter-Logic Application✔ Why introduce an adapter?✔ How A.L.A. works✔ Operational modes✔ The clustering subsystem✔ How JGroups helped A.L.A.

5) Other application areas of JGroups

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Group communication

Every Distributed Systems need to communicate through a reliable layer.

All nodes cooperating for a unique target may have the necessity to rely on a complex communication architecture to merge/compare data (e.g. SETI@home, Clustering, etc.)

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Group Communication issuesThe most common problems in group communication are:✔ Keep consistence between replicas✔ Prevent data corruptions✔ Ensure a message is delivered to recipients✔ many more...

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Group Communication issuesThe most common problems in group communication are:✔ Keep consistence between replicas✔ Prevent data corruptions✔ Ensure a message is delivered to recipients✔ many more...

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Group Communication issuesThe most common problems in group communication are:✔ Keep consistence between replicas✔ Prevent data corruptions✔ Ensure a message is delivered to recipients✔ many more...

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The JGroups solution

JGroups is a multi platform toolkit for a reliable group communication

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The JGroups solution

JGroups is a multi platform toolkit for a reliable group communication

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A case study:Adapter-Logic Application

A.L.A. is:✔ a JGroups success story✔ an integration framework (adapter) for heterogeneous environments and architectures.✔ a solution to integrate legacy systems in SOA flows

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A case study:Adapter-Logic Application

A.L.A. is:✔ a JGroups success story✔ an integration framework (adapter) for heterogeneous environments and architectures.✔ a solution to integrate legacy systems in SOA flows

Only one platform to manage several architectures!

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Why introduce an adapter?

Overcome the barriers due to the lack of a common language between heterogeneous systems

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How A.L.A. works

A.L.A. works through a very scalable plugins system called Controllers and Connectors

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How A.L.A. works

A.L.A. works through a very scalable plugins system called Controllers and Connectors

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A.L.A. operational modes

Two operational modes:✔ Active/Active

hot standby sparing: two or more A.L.A. instances run in parallel.

→ High Availability and Load Balancing✔ Active/Passive

cold standby sparing: two or more A.L.A. instances but only one is running.

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High Availability and Load BalancingActive/Active:

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High Availability onlyActive/Passive:

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The Clustering subsystem (internals)

A single point of failure

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The Clustering subsystem (internals)

The fault tolerant adapter model

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The Activation Queue

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The Activation Queue

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The Activation Queue

The Activation Queue is reorganized

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How JGroups helped A.L.A.

The Cluster events propagate through the Network thanks to the JGroups API

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Another JGroups utilization example

JBoss Clustering modular stack

24All A.L.A. related images are property of Sunnyvale. I wish to thank Denis Maggiorotto,who is the CEO and founder. All rights reserved.