org.apache.storm.trident.operation

Interface Filter

All Superinterfaces:

EachOperation, Operation, Serializable

All Known Implementing Classes:

BaseFilter, Debug, Equals, FilterNull, Negate, TrueFilter, TrueFilter

public interface Filter
extends EachOperation

Filters take in a tuple as input and decide whether or not to keep that tuple or not.

If the `isKeep()` method of a Filter returns `false` for a tuple, that tuple will be filtered out of the Stream

### Configuration If your `Filter` implementation has configuration requirements, you will typically want to extend BaseFilter and override the Operation.prepare(Map, TridentOperationContext) method to perform your custom initialization.

See Also:

Stream

Method Summary

Modifier and Type	Method and Description
boolean	isKeep(TridentTuple tuple) Determines if a tuple should be filtered out of a stream.

Methods inherited from interface org.apache.storm.trident.operation.Operation

cleanup, prepare

Method Detail

isKeep

boolean isKeep(TridentTuple tuple)

Determines if a tuple should be filtered out of a stream.

Parameters:

tuple - the tuple being evaluated

Returns:

`false` to drop the tuple, `true` to keep the tuple