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pipeline.go
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pipeline.go
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/*
* Copyright 2014-2015 Jason Woods.
*
* Licensed 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 core
import (
"sync"
"github.com/driskell/log-courier/lc-lib/config"
)
type Pipeline struct {
pipes []IPipelineSegment
signal chan interface{}
group sync.WaitGroup
config_sinks map[*PipelineConfigReceiver]chan *config.Config
}
func NewPipeline() *Pipeline {
return &Pipeline{
pipes: make([]IPipelineSegment, 0, 5),
signal: make(chan interface{}),
config_sinks: make(map[*PipelineConfigReceiver]chan *config.Config),
}
}
func (p *Pipeline) Register(ipipe IPipelineSegment) {
p.group.Add(1)
pipe := ipipe.getStruct()
pipe.signal = p.signal
pipe.group = &p.group
p.pipes = append(p.pipes, ipipe)
if ipipe_ext, ok := ipipe.(IPipelineConfigReceiver); ok {
pipe_ext := ipipe_ext.getConfigReceiverStruct()
sink := make(chan *config.Config)
p.config_sinks[pipe_ext] = sink
pipe_ext.config_chan = sink
}
}
func (p *Pipeline) Start() {
for _, ipipe := range p.pipes {
go ipipe.Run()
}
}
func (p *Pipeline) Shutdown() {
close(p.signal)
}
func (p *Pipeline) Wait() {
p.group.Wait()
}
func (p *Pipeline) SendConfig(config *config.Config) {
for _, sink := range p.config_sinks {
sink <- config
}
}
type IPipelineSegment interface {
Run()
getStruct() *PipelineSegment
}
type PipelineSegment struct {
signal <-chan interface{}
group *sync.WaitGroup
}
func (s *PipelineSegment) Run() {
panic("Run() not implemented")
}
func (s *PipelineSegment) getStruct() *PipelineSegment {
return s
}
func (s *PipelineSegment) OnShutdown() <-chan interface{} {
return s.signal
}
func (s *PipelineSegment) Done() {
s.group.Done()
}
type IPipelineConfigReceiver interface {
getConfigReceiverStruct() *PipelineConfigReceiver
}
type PipelineConfigReceiver struct {
config_chan <-chan *config.Config
}
func (s *PipelineConfigReceiver) getConfigReceiverStruct() *PipelineConfigReceiver {
return s
}
func (s *PipelineConfigReceiver) OnConfig() <-chan *config.Config {
return s.config_chan
}