[GEODE-8592] Hang in SetCacheListener

• Type: Bug
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Component/s: native client
• Assignee: Unassigned
• Reporter: Michael Martell
• Created: 09/Oct/20 17:27
• Updated: 09/Oct/20 17:52

Description

As reported on StackOverflow (https://stackoverflow.com/questions/64045931/repeated-ui-calls-to-geode-native-client-attributesmutator-setcachelistener), this looks like a bug with AttributesMutator when setting multiple CacheListeners.

 

Direct from SO:

If I have a button on a UI that registers a listener, sync not async, and click it several times, then repeatedly setting listeners on a region hangs:

A Cache c is already initialized. This is using the C# Geode Native Client.

IRegion<string, Object> d = c.GetRegion<string, Object>("deal");

try
{
     Logs.Trace("Registering key"); d.GetSubscriptionService().RegisterKeys(s); 
     d.AttributesMutator.SetCacheListener(new LDeal<string, Object>(c, AddDeal));
}

catch (Exception ex)
{
     new ApplicationException("Can't register key: " + clOrdId, ex);
}

Is this an optimal way to set a listener on a region? If it's going to hang how can I have a timeout so that setting a listener is better managed?

UPDATE: using async / await appears to resolve this issue, so that the SetCacheListener becomes

 await Task.Run(() => d.AttributesMutator.SetCacheListener(
     new LDeal<string, Object>(c, AddDeal)));
 

except that later unregistering a listener

await Task.Run(() => r.GetSubscriptionService().UnregisterKeys(s));

always gives a silent error (with apparently no impact)

Apache.Geode.Client.IllegalStateException: : illegal State --->
Apache.Geode.Client.GeodeException: 0# 0x00007FF844136B85 in Apache_Geode
1# 0x00007FF844136C5D in Apache_Geode
2# 0x00007FF8441CCC1E in Apache_Geode
3# 0x00007FF84424EB41 in Apache_Geode
4# 0x00007FF8441E5557 in Apache_Geode
5# 0x00007FF85FCA87E