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# Namespace Apache.Ignite.Core.Cache.Query.Continuous

### Classes

#### ContinuousQuery

Continuous query base class, see ContinuousQuery<TK, TV>.

#### ContinuousQuery<TK, TV>

API for configuring continuous cache queries.

Continuous queries allow to register a remote and a listener for cache update events. If an update event passes the filter, it will be sent to the node that executed the query and listener will be notified on that node.

Continuous query can either be executed on the whole topology or only on local node.

In case query is distributed and a new node joins, it will get the filter for the query during discovery process before it actually joins topology, so no updates will be missed.

To execute the query use method QueryContinuous(ContinuousQuery<TK, TV>).

#### ContinuousQueryExtensions

Extensions for continuous queries.

### Interfaces

#### IContinuousQueryHandle

Represents a continuous query handle.

#### IContinuousQueryHandle<T>

Represents a continuous query handle.

#### IContinuousQueryHandleFields

Represents a continuous query handle for SqlFieldsQuery used as initial query.