Building Modular Java Applications in the Cloud Age vJUG, March 2015
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Building Modular Java Applications in the Cloud Age
vJUG, March 2015
Bert Ertman Fellow at Luminis (Netherlands) former JUG Leader for NLJUG Java Champion
@BertErtman
About me
Observations
Extremely agile (first mover advantage)
Architecture (and code base)
should be able to cope with change
The case for modularity
Modularity is the ultimate agile tool!
Small, disposable, components
Prevents code rot on the architectural level
Isolate problems, focus work
Prevent (tight)
coupling
What we learned about OO design in university :
Promote cohesion
coupling
cohesion
Modules Service Lookups
Wha
t do
we
need
design
consequences
High-level enterprise APIs
Architectural focus on
modularity
Runtime dynamic module
framework
Right now, OSGi is the only option
let’s not reinvent the
wheel
for
mod
ular
ity?
Auth Blob stores MongoDB JPA Multi-tenancy OpenSocial Search Remote Services REST Template Web ...
Components
Stop talking… and show me code!
Products Rest
Products API
Products Service
MongoDB
Orders Rest
Orders API
Orders Service
MongoDB
Customers API
Customers Service
MongoDB
... Rest
... API
... Service
modularity
in action...
What about deployment?
Provisioning Server
Provisioning servers
Node
AWS Auto Scaling
1. Start Load Balancer
Apache ACE
2. register
3. register
4. provision deployment
package
Provisioning servers
Nodes are completely disposable
Automated cluster recovery
Nodes do not require maintenance
No “big” container
Wrap up
TakkGrazie
Thank you
Obrigado
MahaloDanke
Dank UMerci
Gracias
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