lizhiboo opened a new issue #47:
URL: https://github.com/apache/rocketmq-streams/issues/47
AFAIK, FilterFunction return true indicate this message will be conducted in
flink.
```java
public <O> DataStream filter(final FilterFunction<O> filterFunction) {
StageBuilder mapUDFOperator = new StageBuilder() {
@Override
protected <T> T operate(IMessage message, AbstractContext
context) {
try {
boolean isFilter =
filterFunction.filter((O)message.getMessageValue());
if (isFilter) {
context.breakExecute();
}
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
};
ChainStage stage =
this.mainPipelineBuilder.createStage(mapUDFOperator);
this.mainPipelineBuilder.setTopologyStages(currentChainStage, stage);
return new DataStream(this.mainPipelineBuilder,
this.otherPipelineBuilders, stage);
}
```
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