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windowing.go
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/
windowing.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 beam
import (
"fmt"
"github.com/apache/beam/sdks/go/pkg/beam/core/graph"
"github.com/apache/beam/sdks/go/pkg/beam/core/graph/window"
)
// WindowInto applies the windowing strategy to each element.
func WindowInto(s Scope, ws *window.Fn, col PCollection) PCollection {
return Must(TryWindowInto(s, ws, col))
}
// TryWindowInto attempts to insert a WindowInto transform.
func TryWindowInto(s Scope, ws *window.Fn, col PCollection) (PCollection, error) {
if !s.IsValid() {
return PCollection{}, fmt.Errorf("invalid scope")
}
if !col.IsValid() {
return PCollection{}, fmt.Errorf("invalid input pcollection")
}
edge := graph.NewWindowInto(s.real, s.scope, ws, col.n)
ret := PCollection{edge.Output[0].To}
return ret, nil
}