Storm OutputFieldsDeclarer

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于 2017-09-28 16:53:34 发布

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分类专栏： Storm

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本文介绍了Apache Storm中OutputFieldsDeclarer接口的功能与用法，包括如何声明默认流及指定流的输出字段，适用于需要了解Storm数据处理流程的开发者。

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All Known Implementing Classes:
OutputFieldsGetter
```
public interface OutputFieldsDeclarer
```

All Methods Instance Methods Abstract Methods
Modifier and Type	Method and Description
`void`	`declare(boolean direct, Fields fields)`
`void`	`declare(Fields fields)` Uses default stream id.
`void`	`declareStream(String streamId, boolean direct, Fields fields)`
`void`	`declareStream(String streamId, Fields fields)`

void declare(boolean direct,
             Fields fields)

void declareStream(String streamId,
                   Fields fields)

void declareStream(String streamId,
                   boolean direct,
                   Fields fields)