RuntimeContext (ray streaming api 1.9.2 API)

```
public interface RuntimeContext
```
Encapsulate the runtime information of a streaming task.

所有方法实例方法抽象方法
限定符和类型	方法和说明
`Long`	`getCheckpointId()`
`Map<String,String>`	`getConfig()` Returns config of current function
`Map<String,String>`	`getJobConfig()` Returns config of the job
`KeyStateBackend`	`getKeyStateBackend()`
`<T> ListState<T>`	`getListState(ListStateDescriptor<T> stateDescriptor)`
`<S,T> MapState<S,T>`	`getMapState(MapStateDescriptor<S,T> stateDescriptor)`
`int`	`getParallelism()`
`int`	`getTaskId()`
`int`	`getTaskIndex()`
`<T> ValueState<T>`	`getValueState(ValueStateDescriptor<T> stateDescriptor)`
`void`	`setCheckpointId(long checkpointId)`
`void`	`setCurrentKey(Object key)`
`void`	`setKeyStateBackend(KeyStateBackend keyStateBackend)`

getConfig
```
Map<String,String> getConfig()
```
Returns config of current function

getJobConfig
```
Map<String,String> getJobConfig()
```
Returns config of the job

void setCheckpointId(long checkpointId)

void setKeyStateBackend(KeyStateBackend keyStateBackend)

<T> ValueState<T> getValueState(ValueStateDescriptor<T> stateDescriptor)

<T> ListState<T> getListState(ListStateDescriptor<T> stateDescriptor)

<S,T> MapState<S,T> getMapState(MapStateDescriptor<S,T> stateDescriptor)

接口 RuntimeContext