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# Namespace Apache.Ignite.Core.Messaging

### Interfaces

#### IMessageListener<T>

Represents messaging filter predicate.

#### IMessaging

Provides functionality for topic-based message exchange among nodes defined by IClusterGroup. Users can send ordered and unordered messages to various topics. Note that same topic name cannot be reused between ordered and unordered messages.

All members are thread-safe and may be used concurrently from multiple threads.