forked from apache/beam
/
multiplex.go
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/
multiplex.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"
"fmt"
)
// Multiplex is a fan-out node. It simply forwards any call to all downstream nodes.
type Multiplex struct {
// UID is the unit identifier.
UID UnitID
// Out is a list of output nodes.
Out []Node
}
func (m *Multiplex) ID() UnitID {
return m.UID
}
func (m *Multiplex) Up(ctx context.Context) error {
return nil
}
func (m *Multiplex) StartBundle(ctx context.Context, id string, data DataManager) error {
return MultiStartBundle(ctx, id, data, m.Out...)
}
func (m *Multiplex) ProcessElement(ctx context.Context, elm FullValue, values ...ReStream) error {
for _, out := range m.Out {
if err := out.ProcessElement(ctx, elm, values...); err != nil {
return err
}
}
return nil
}
func (m *Multiplex) FinishBundle(ctx context.Context) error {
return MultiFinishBundle(ctx, m.Out...)
}
func (m *Multiplex) Down(ctx context.Context) error {
return nil
}
func (m *Multiplex) String() string {
return fmt.Sprintf("Multiplex. Out:%v", IDs(m.Out...))
}