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page.go
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page.go
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/*
* Copyright (c) 2013-2021 Utkan Güngördü <[email protected]>
* Copyright (c) 2021-2024 Piotr Grabowski
*
* 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 gomicsv
import (
"fmt"
"log"
"sort"
"strings"
"time"
"github.com/fauu/gomicsv/pagecache"
"github.com/fauu/gomicsv/util"
"github.com/gotk3/gotk3/glib"
)
const (
pageCacheTrimInterval = 3 * time.Minute
preloadedPageKeepAtLeastFor = 7 * time.Minute
)
func (app *App) setPage(n int) {
if !app.archiveIsLoaded() {
return
}
if n < 0 {
n = 0
}
if app.S.Archive.Len() != nil && n >= *app.S.Archive.Len() {
n = *app.S.Archive.Len() - 1
}
if n == app.S.ArchivePos {
return
}
isPrev := false
if n == app.S.ArchivePos-1 || (app.Config.DoublePage && n == app.S.ArchivePos-2) {
isPrev = true
}
app.doSetPage(n)
var scrollFunc func()
if isPrev {
scrollFunc = app.scrollToEnd
} else {
scrollFunc = app.scrollToStart
}
glib.TimeoutAdd(0, scrollFunc)
}
func (app *App) doSetPage(n int) {
if !app.archiveIsLoaded() {
return
}
app.jumpmarksHandleSetPage(n - 1)
var err error
app.S.PixbufL, err = app.S.Archive.Load(n, app.Config.EmbeddedOrientation, app.Config.NPreload)
if err != nil {
return
}
app.S.ArchivePos = n
app.S.PixbufR = nil
if app.Config.DoublePage && (app.S.Archive.Len() == nil || *app.S.Archive.Len() > n+1) {
app.S.PixbufR, err = app.S.Archive.Load(n+1, app.Config.EmbeddedOrientation, app.Config.NPreload)
if err != nil {
app.showError(err.Error())
return
}
}
util.GC()
app.blit()
app.updateStatus()
}
func (app *App) trimPageCache() {
if app.S.PageCache == nil {
return
}
// Mark pages as no longer needed for preload unless they're recently fetched or near the current page
var preloadDontKeep []int
nearKeepStart := app.S.ArchivePos - app.Config.NPreload
nearKeepEnd := app.S.ArchivePos + app.Config.NPreload
for i, entry := range app.S.PageCache.Pages {
if time.Since(entry.Time) > preloadedPageKeepAtLeastFor && (i < nearKeepStart || i > nearKeepEnd) {
preloadDontKeep = append(preloadDontKeep, i)
}
}
if len(preloadDontKeep) > 0 {
app.S.PageCache.DontKeepSlice(preloadDontKeep, pagecache.KeepReasonPreload)
}
// Trim unneeded pages
app.S.PageCache.Trim()
// Log cache status
var indices []int
for i := range app.S.PageCache.Pages {
indices = append(indices, i+1)
}
sort.Ints(indices)
var strIndices []string
for _, index := range indices {
strIndices = append(strIndices, fmt.Sprint(index))
}
var remainingStr string
if len(strIndices) == 0 {
remainingStr = "-"
} else {
remainingStr = strings.Join(strIndices, ", ")
}
log.Printf("Trimmed page cache. Remaining pages: %s", remainingStr)
}