/
window.go
92 lines (76 loc) · 2.72 KB
/
window.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"
"time"
"github.com/apache/beam/sdks/go/pkg/beam/core/graph/mtime"
"github.com/apache/beam/sdks/go/pkg/beam/core/graph/window"
"github.com/apache/beam/sdks/go/pkg/beam/core/typex"
)
// WindowInto places each element in one or more windows.
type WindowInto struct {
UID UnitID
Fn *window.Fn
Out Node
}
func (w *WindowInto) ID() UnitID {
return w.UID
}
func (w *WindowInto) Up(ctx context.Context) error {
return nil
}
func (w *WindowInto) StartBundle(ctx context.Context, id string, data DataContext) error {
return w.Out.StartBundle(ctx, id, data)
}
func (w *WindowInto) ProcessElement(ctx context.Context, elm *FullValue, values ...ReStream) error {
windowed := &FullValue{
Windows: assignWindows(w.Fn, elm.Timestamp),
Timestamp: elm.Timestamp,
Elm: elm.Elm,
Elm2: elm.Elm2,
}
return w.Out.ProcessElement(ctx, windowed, values...)
}
func assignWindows(wfn *window.Fn, ts typex.EventTime) []typex.Window {
switch wfn.Kind {
case window.GlobalWindows:
return window.SingleGlobalWindow
case window.FixedWindows:
start := ts - (ts.Add(wfn.Size) % mtime.FromDuration(wfn.Size))
end := mtime.Min(start.Add(wfn.Size), mtime.EndOfGlobalWindowTime.Add(time.Millisecond))
return []typex.Window{window.IntervalWindow{Start: start, End: end}}
case window.SlidingWindows:
var ret []typex.Window
period := mtime.FromDuration(wfn.Period)
lastStart := ts - (ts.Add(wfn.Size) % period)
for start := lastStart; start > ts.Subtract(wfn.Size); start -= period {
ret = append(ret, window.IntervalWindow{Start: start, End: start.Add(wfn.Size)})
}
return ret
default:
panic(fmt.Sprintf("Unexpected window fn: %v", wfn))
}
}
func (w *WindowInto) FinishBundle(ctx context.Context) error {
return w.Out.FinishBundle(ctx)
}
func (w *WindowInto) Down(ctx context.Context) error {
return nil
}
func (w *WindowInto) String() string {
return fmt.Sprintf("WindowInto[%v]. Out:%v", w.Fn, w.Out.ID())
}