100 lines
2.5 KiB
Go
100 lines
2.5 KiB
Go
/*
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Copyright (c) 2015, Hendrik van Wyk
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice, this
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list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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* Neither the name of invertergui nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package datasource
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import (
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"sync"
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"time"
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)
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type DataPoller interface {
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C() chan *Status
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Stop()
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}
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type Status struct {
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MpStatus MultiplusStatus
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Time time.Time
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Err error
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}
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type poller struct {
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source DataSource
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rate time.Duration
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statusChan chan *Status
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stop chan struct{}
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wg sync.WaitGroup
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}
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func NewDataPoller(source DataSource, pollRate time.Duration) DataPoller {
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this := &poller{
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source: source,
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rate: pollRate,
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statusChan: make(chan *Status),
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stop: make(chan struct{}),
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}
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this.wg.Add(1)
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go this.poll()
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return this
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}
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func (this *poller) C() chan *Status {
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return this.statusChan
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}
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func (this *poller) Stop() {
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close(this.stop)
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this.wg.Wait()
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}
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func (this *poller) poll() {
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ticker := time.NewTicker(this.rate)
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this.doPoll()
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for {
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select {
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case <-ticker.C:
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this.doPoll()
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case <-this.stop:
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ticker.Stop()
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close(this.statusChan)
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this.wg.Done()
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return
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}
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}
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}
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func (this *poller) doPoll() {
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tmp := new(Status)
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tmp.Err = this.source.GetData(&tmp.MpStatus)
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tmp.Time = time.Now()
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this.statusChan <- tmp
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}
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