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windows.go
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windows.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 coder
// WindowKind represents a kind of window coder.
type WindowKind string
// Available window coders. The same coder could be used for
// more than one kind of windowing strategy.
const (
GlobalWindow WindowKind = "GWC"
IntervalWindow WindowKind = "IWC"
)
// WindowCoder represents a Window coder.
type WindowCoder struct {
Kind WindowKind
Payload string // Payload is only populated for parameterized window coders.
}
// Equals returns whether passed in WindowCoder has the same
// Kind and Payload as this WindowCoder.
func (w *WindowCoder) Equals(o *WindowCoder) bool {
return w.Kind == o.Kind && w.Payload == o.Payload
}
func (w *WindowCoder) String() string {
return string(w.Kind)
}
// NewGlobalWindow returns a window coder for the global window.
func NewGlobalWindow() *WindowCoder {
return &WindowCoder{Kind: GlobalWindow}
}
// NewIntervalWindow returns a window coder for interval windows.
func NewIntervalWindow() *WindowCoder {
return &WindowCoder{Kind: IntervalWindow}
}