[DB] Catch exception thrown by purge policy to prevent timer thread to

stop

Author: alexrobin

sensorhub-core/src/main/java/org/sensorhub/impl/database/system/SystemDriverDatabase.java

@@ -94,8 +94,15 @@ protected void doStart() throws SensorHubException
                 TimerTask task = new TimerTask() {
                     public void run()
                     {
-                        if (!db.isReadOnly())
-                            policy.trimStorage(db, logger, uids);
+                        try
+                        {
+                            if (!db.isReadOnly())
+                                policy.trimStorage(db, logger, uids);
+                        }
+                        catch (Exception e)
+                        {
+                            getLogger().error("Error while executing purge policy", e);
+                        }
                     }
                 };