| Interface | Description | 
|---|---|
| KeyExtractor | 
 Extracts a key from an element. 
 | 
| Class | Description | 
|---|---|
| ArgBuilder | 
 Argument builder. 
 | 
| ContextImpl | 
 Transform Context Implementation. 
 | 
| DirectByteArrayOutputStream | 
 This class represents a custom implementation of  
ByteArrayOutputStream,
 which enables to get bytes buffer directly (without memory copy). | 
| Pair<A,B> | 
 Pair class. 
 | 
| StateMachine | 
 A finite state machine that can be created with user defined states and transitions. 
 | 
| StateMachine.Builder | 
 Builder that builds a StateMachine. 
 | 
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