Liferay Portlet可以侦听数据库事件吗？

Question

My current setup :

• Multiple nodes share the same database updating the values.
• The cache is NOT shared among them

Requirement :

• The liferay cache needs to be updated when any one node does a DB update.

Question

• Is there a way portlets can listen to my database and update its cache .
• Is cache independency a correct approach ? (I dont have control over this decision)
• If we do proper clustering, can we shut down a node independent of the other. Will liferay handle this automatically ?

Thanks in advance

Answer 1

I would cluster Liferay and enable propagation of cache invalidation. Then when something changes the data would be automatically updated.

If you by cache independency mean that the cache is not replicated then I would say yes. Replication is costly and propagation of cache invalidation should suffice.

If you have clustering you have to have node balancing in front of Liferay (apache ...). Then when you kill one Liferay the balancer should detect it and ignore the killed node until it goes up again.