/
impulse.go
65 lines (54 loc) · 1.84 KB
/
impulse.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 direct
import (
"context"
"fmt"
"github.com/apache/beam/sdks/v2/go/pkg/beam/core/graph/mtime"
"github.com/apache/beam/sdks/v2/go/pkg/beam/core/graph/window"
"github.com/apache/beam/sdks/v2/go/pkg/beam/core/runtime/exec"
)
// Impulse emits its single element in one invocation.
type Impulse struct {
UID exec.UnitID
Value []byte
Out exec.Node
}
func (n *Impulse) ID() exec.UnitID {
return n.UID
}
func (n *Impulse) Up(ctx context.Context) error {
return nil
}
func (n *Impulse) StartBundle(ctx context.Context, id string, data exec.DataContext) error {
return n.Out.StartBundle(ctx, id, data)
}
func (n *Impulse) Process(ctx context.Context) error {
value := &exec.FullValue{
Windows: window.SingleGlobalWindow,
Timestamp: mtime.Now(),
Elm: n.Value,
}
return n.Out.ProcessElement(ctx, value)
}
func (n *Impulse) FinishBundle(ctx context.Context) error {
return n.Out.FinishBundle(ctx)
}
func (n *Impulse) Down(ctx context.Context) error {
return nil
}
func (n *Impulse) String() string {
return fmt.Sprintf("Impulse[%v]", len(n.Value))
}