Imagine being able to call wait() on a Java object in one JVM, and imagine that later a thread in another JVM on another computer calls notify() on that same object and that notify() call penetrates the impermeable process boundary between the two JVMs to wake your thread from its slumber. Further imagine that all of the changes to that object made in the other JVM while you were waiting are now visible to your thread. Imagine now that the code you wrote to make this happen looked no different than code you would have written were this program to run only on a single JVM—no concessions to special frameworks, no callouts to special APIs, no stubs, no skeletons, no copies, no put-backs, and no magic beans.
What would it be like if you could automatically share Java heap between virtual machines so that threads running in different JVMs could interact with each other exactly as if they were running in the same JVM? Imagine what you could do with that kind of power -— the power to express a computing problem in the simplest possible terms that stay true to the problem at hand yet be able to run that program on multiple computers at once while the program thinks it’s running on one big computer. What would such a thing be? And wouldn’t you really, really want it if you could have it?
Terracotta was born out of just such imaginings.
Terracotta is Java infrastructure software that allows you to scale your application to as many computers as needed, without expensive custom code or databases. Throughout this book, it is referred to as JVM-level clustering or network-attached memory. The question you now face is how to understand and leverage this technology best.
Doesn't that sound cool? Its an excerpt from the introduction in
The Definitive Guide to Terracotta about
Terracotta from the same people who made all this imaginations a reality.
I am working for
Terracotta these days, and since joining had been doing real cool stuff.
We are developing a reference app these days on the
sessions-clustering use case. Its not only about developing a web-app and clustering a web application with Terracotta, but get out the best practices and design patterns and best ways to solve problems for similar use cases, to say the least. We had focussed down on the
technology stack and almost done developing the app.
In the process, I learnt a lot personally and got exposed to cool new technologies and how to leverage Terracotta. I plan to share my experience and hope that it helps others out there.
More posts coming up on Spring, Spring MVC, Spring Web-flow, Spring security, JPA, hibernate, maven... and other cool stuffs!!
Stay tuned... ;-)
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