| Class and Description | 
|---|
| Command | 
| CommandDispatcher a CommandDispatcher receives  Commandfrom upstream
 and performs corresponding operations | 
| DataChannel | 
| DataReceiver a DataReceiver pulls in arriving data, an example
 is  BufferPuller | 
| INativeHandler A Handler accept input, and give output can be used to transfer command and data | 
| NativeDataSource NativeDataSource loads data from upstream | 
| NativeDataTarget NativeDataTarge sends data to downstream | 
| Platform Base class for platforms. | 
| TaskContext | 
| Class and Description | 
|---|
| NativeDataTarget NativeDataTarge sends data to downstream | 
| Class and Description | 
|---|
| Command | 
| CommandDispatcher a CommandDispatcher receives  Commandfrom upstream
 and performs corresponding operations | 
| DataReceiver a DataReceiver pulls in arriving data, an example
 is  BufferPuller | 
| ICombineHandler interacts with native side to support Java Combiner | 
| INativeHandler A Handler accept input, and give output can be used to transfer command and data | 
| NativeDataSource NativeDataSource loads data from upstream | 
| NativeDataTarget NativeDataTarge sends data to downstream | 
| TaskContext | 
| Class and Description | 
|---|
| INativeComparable Any key type that is comparable at native side must implement this interface. | 
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