96 lines
1.9 KiB
Go
96 lines
1.9 KiB
Go
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// Copyright (C) 2014 The Syncthing Authors.
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//
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// This program is free software: you can redistribute it and/or modify it
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// under the terms of the GNU General Public License as published by the Free
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// Software Foundation, either version 3 of the License, or (at your option)
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// any later version.
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//
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// This program is distributed in the hope that it will be useful, but WITHOUT
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// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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// more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with this program. If not, see <http://www.gnu.org/licenses/>.
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package ignore
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import (
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"sync"
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"time"
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)
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var (
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caches = make(map[string]*cache)
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cacheMut sync.Mutex
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)
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func init() {
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// Periodically go through the cache and remove cache entries that have
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// not been touched in the last two hours.
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go cleanIgnoreCaches(2 * time.Hour)
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}
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type cache struct {
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patterns []Pattern
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entries map[string]cacheEntry
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mut sync.Mutex
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}
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type cacheEntry struct {
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value bool
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access time.Time
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}
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func newCache(patterns []Pattern) *cache {
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return &cache{
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patterns: patterns,
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entries: make(map[string]cacheEntry),
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}
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}
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func (c *cache) clean(d time.Duration) {
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c.mut.Lock()
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for k, v := range c.entries {
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if time.Since(v.access) > d {
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delete(c.entries, k)
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}
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}
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c.mut.Unlock()
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}
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func (c *cache) get(key string) (result, ok bool) {
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c.mut.Lock()
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res, ok := c.entries[key]
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if ok {
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res.access = time.Now()
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c.entries[key] = res
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}
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c.mut.Unlock()
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return res.value, ok
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}
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func (c *cache) set(key string, val bool) {
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c.mut.Lock()
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c.entries[key] = cacheEntry{val, time.Now()}
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c.mut.Unlock()
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}
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func (c *cache) len() int {
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c.mut.Lock()
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l := len(c.entries)
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c.mut.Unlock()
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return l
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}
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func cleanIgnoreCaches(dur time.Duration) {
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for {
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time.Sleep(dur)
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cacheMut.Lock()
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for _, v := range caches {
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v.clean(dur)
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}
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cacheMut.Unlock()
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}
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}
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