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pipe.go
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pipe.go
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// Copyright (c) 2017 letian0805@gmail.com
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
package pipeline
import (
"errors"
"time"
)
type Sink interface {
Push(data Data) error
SetSpeed(speed float64)
}
type Source interface {
Pull() Data
SetSpeed(speed float64)
}
type Pipe interface {
Init(size int) Pipe
Push(data Data) error
Pull() Data
SetSpeed(speed float64)
GetSource() Source
GetSink() Sink
Close()
}
type source struct {
ch *Chan
*Limiter
}
func (s *source) Pull() Data {
if duration := s.Update(); duration > 0 {
time.Sleep(duration)
}
if data, ok := s.ch.Pull().(Data); ok {
return data
}
return nil
}
type sink struct {
ch *Chan
*Limiter
}
func (s *sink) Push(data Data) error {
if data == nil {
return errors.New("data is nil")
}
if duration := s.Update(); duration > 0 {
time.Sleep(duration)
}
return s.ch.Push(data)
}
type BasePipe struct {
ch *Chan
in Limiter
out Limiter
}
func (bp *BasePipe) Init(size int) Pipe {
if bp.ch == nil {
bp.ch = MakeChan(size)
}
return bp
}
func (bp *BasePipe) Push(data Data) error {
return bp.GetSink().Push(data)
}
func (bp *BasePipe) Pull() Data {
return bp.GetSource().Pull()
}
func (bp *BasePipe) SetSpeed(speed float64) {
bp.GetSource().SetSpeed(speed)
bp.GetSink().SetSpeed(speed)
}
func (bp *BasePipe) GetSource() Source {
s := &source{}
s.ch = bp.ch
s.Limiter = &bp.out
return s
}
func (bp *BasePipe) GetSink() Sink {
s := &sink{}
s.ch = bp.ch
s.Limiter = &bp.in
return s
}
func (bp *BasePipe) Close() {
if bp.ch != nil {
bp.ch.Close()
bp.ch = nil
}
}