Coherence Web Service cache

Question

Hi all,
I want to cache an web service with coherence and I have no idea where to start, here is my problem :
    I have a database, an web service that queries and modifies the data and an OSB that uses this service and also makes some transformations.
    I want to cache the OSB result, how do I do that ? I suppose the only thing I will have will be the WSDL for the service ... do I have to generate my classes with jax-ws ? any links will be helpful.
Thank you,
Marius

Answer 1

Your outline is correct.
The simplest thing to do in the web service machines is to create storage disabled Coherence nodes and use the NamedCache API to put data into the cache. The storage disabled node participates in the cluster but does not hold any data so its JVM shouldn't run out of memory. These are configured just like every other node except storage is disabled. A storage disabled node is effectively a client.
If you want a true client, you can use Extend (http://coherence.oracle.com/display/COH35UG/Coherence+Extend).
In step 5, you can execute business logic in Coherence using entry processors. The advantage is that the processing will run on the machine with the data so the work is distributed. The work can be triggered by events as you pointed out.
The number of JVMs running Coherence depends on the memory and number of cores available for each physical machine. As a rule of thumb, you can use 1 JVM per 2 cores for best latency. In your case, the main determinant will be the amount of processing of the messages you want to do in a Coherence node. If you're just storing and extracting cache data, you can probably have a JVM per core.
Regards,
David