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sourcelist.go
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sourcelist.go
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/* Copyright 2012, mokasin
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package main
import (
"container/list"
"github.com/mokasin/musicrawler/lib/database"
"github.com/mokasin/musicrawler/lib/source"
)
// Struct to manage different track sources
type SourceList struct {
sources *list.List
db *database.Database
}
// Constructor of Sources.
func NewSourceList(db *database.Database) *SourceList {
return &SourceList{
sources: list.New(),
db: db,
}
}
// Add a source to source list.
func (self *SourceList) Add(source source.TrackSource) {
self.sources.PushBack(source)
}
// Remove element from source list.
func (self *SourceList) Remove(e *list.Element) {
self.sources.Remove(e)
}
func (self *SourceList) Update(statusChannel chan *UpdateStatus,
result chan *UpdateResult) {
trackInfoChannel := make(chan source.TrackInfo, 100)
updateResultChannel := make(chan *UpdateResult)
doneChannel := make(chan bool)
// Output of crawler(self) connects to the input of database.Update() over
// trackInfoChannel channel
go UpdateDatabase(self.db, trackInfoChannel, statusChannel, updateResultChannel)
running := 0
for e := self.sources.Front(); e != nil; e = e.Next() {
if ts, ok := e.Value.(source.TrackSource); ok {
running++
go ts.Crawl(trackInfoChannel, doneChannel)
}
}
// wait until every source crawling has finished
go func() {
for running > 0 {
running--
<-doneChannel
}
close(trackInfoChannel)
}()
// wait for database.Update to finish
r := <-updateResultChannel
result <- r
}