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discard.go
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/
discard.go
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// Licensed to the Apache Software Foundation (ASF) under one or more
// contributor license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright ownership.
// The ASF licenses this file to You under the Apache License, Version 2.0
// (the "License"); you may not use this file except in compliance with
// the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package exec
import "context"
// Discard silently discard all elements. It is implicitly inserted for any
// loose ends in the pipeline.
type Discard struct {
// UID is the unit identifier.
UID UnitID
}
func (d *Discard) ID() UnitID {
return d.UID
}
func (d *Discard) Up(ctx context.Context) error {
return nil
}
func (d *Discard) StartBundle(ctx context.Context, id string, data DataContext) error {
return nil
}
func (d *Discard) ProcessElement(ctx context.Context, value *FullValue, values ...ReStream) error {
return nil
}
func (d *Discard) FinishBundle(ctx context.Context) error {
return nil
}
func (d *Discard) Down(ctx context.Context) error {
return nil
}
func (d *Discard) String() string {
return "Discard"
}