forked from apache/beam
/
windows.go
78 lines (65 loc) · 2.27 KB
/
windows.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
// 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 window
import (
"fmt"
"github.com/apache/beam/sdks/go/pkg/beam/core/graph/mtime"
"github.com/apache/beam/sdks/go/pkg/beam/core/typex"
)
var (
// SingleGlobalWindow is a slice of a single global window. Convenience value.
SingleGlobalWindow = []typex.Window{GlobalWindow{}}
)
// GlobalWindow represents the singleton, global window.
type GlobalWindow struct{}
// MaxTimestamp returns the maximum timestamp in the window.
func (GlobalWindow) MaxTimestamp() typex.EventTime {
return mtime.EndOfGlobalWindowTime
}
func (GlobalWindow) Equals(o typex.Window) bool {
_, ok := o.(GlobalWindow)
return ok
}
func (GlobalWindow) String() string {
return "[*]"
}
// IntervalWindow represents a half-open bounded window [start,end).
type IntervalWindow struct {
Start, End typex.EventTime
}
// MaxTimestamp returns the maximum timestamp in the window.
func (w IntervalWindow) MaxTimestamp() typex.EventTime {
return typex.EventTime(mtime.Time(w.End).Milliseconds() - 1)
}
func (w IntervalWindow) Equals(o typex.Window) bool {
ow, ok := o.(IntervalWindow)
return ok && w.Start == ow.Start && w.End == ow.End
}
func (w IntervalWindow) String() string {
return fmt.Sprintf("[%v:%v)", w.Start, w.End)
}
// IsEqualList returns true iff the lists of windows are equal.
// Note that ordering matters and that this is not set equality.
func IsEqualList(from, to []typex.Window) bool {
if len(from) != len(to) {
return false
}
for i, w := range from {
if !w.Equals(to[i]) {
return false
}
}
return true
}