Hello, Igniters! I'd like to discuss java thin client Continuous Queries public API.
Currently, the thin client is not JCache compatible and without JCache compatible cache instance we can't use classes and API which already used by the thick client for cache entry events listening. In my first attempt to implement thin client CQ I've tried to create own CQ classes and interfaces for thin client, but such API looks weird. On the one hand, we should use CacheEntryEventFilter (JCache interface) since it's required by the server-side, on the other hand, we can't use CacheEntryUpdatedListener since it requires CacheEntryEvent which requires an instance of Cache (JCache interface), which doesn't exist on the thin-client side. We've already discussed this problem with Pavel Tupitsyn in ticket [1] and come to an agreement that the most suitable solution is to implement some private thin-client cache to JCache adapter, but not expose it to public API and don't provide full JCache support by the thin client (see comments in the ticket for more details). In this case, we can reuse CQ classes and interfaces and make the API similar to thick-client. Another problem: for the thin client we should be able to inform the user about channel failure. I propose to introduce some interface ClientChannelDisconnectListener and notify about channel failure if provided CacheEntryListener implements this interface. Unfortunately, if we want to keep thin client API similar to the thick client we can't explicitly use this interface in methods parameters, so the knowledge that user can use this interface for cache entry listener can be obtained only from JavaDoc or Ignite documentation. Igniters, WDYT? Here is PR with implemented proposals [2]. [1]: https://issues.apache.org/jira/browse/IGNITE-14402 [2]: https://github.com/apache/ignite/pull/8960
