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// Adapted from https://github.com/thought-machine/please
// Copyright Thought Machine, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
package cache
import (
"sync"
"github.com/vercel/turbo/cli/internal/turbopath"
)
// An asyncCache is a wrapper around a Cache interface that handles incoming
// store requests asynchronously and attempts to return immediately.
// The requests are handled on an internal queue, if that fills up then
// incoming requests will start to block again until it empties.
// Retrieval requests are still handled synchronously.
type asyncCache struct {
requests chan cacheRequest
realCache Cache
wg sync.WaitGroup
}
// A cacheRequest models an incoming cache request on our queue.
type cacheRequest struct {
anchor turbopath.AbsoluteSystemPath
key string
duration int
files []turbopath.AnchoredSystemPath
}
func newAsyncCache(realCache Cache, opts Opts) Cache {
c := &asyncCache{
requests: make(chan cacheRequest),
realCache: realCache,
}
c.wg.Add(opts.Workers)
for i := 0; i < opts.Workers; i++ {
go c.run()
}
return c
}
func (c *asyncCache) Put(anchor turbopath.AbsoluteSystemPath, key string, duration int, files []turbopath.AnchoredSystemPath) error {
c.requests <- cacheRequest{
anchor: anchor,
key: key,
files: files,
duration: duration,
}
return nil
}
func (c *asyncCache) Fetch(anchor turbopath.AbsoluteSystemPath, key string, files []string) (ItemStatus, []turbopath.AnchoredSystemPath, int, error) {
return c.realCache.Fetch(anchor, key, files)
}
func (c *asyncCache) Exists(key string) ItemStatus {
return c.realCache.Exists(key)
}
func (c *asyncCache) Clean(anchor turbopath.AbsoluteSystemPath) {
c.realCache.Clean(anchor)
}
func (c *asyncCache) CleanAll() {
c.realCache.CleanAll()
}
func (c *asyncCache) Shutdown() {
// fmt.Println("Shutting down cache workers...")
close(c.requests)
c.wg.Wait()
// fmt.Println("Shut down all cache workers")
}
// run implements the actual async logic.
func (c *asyncCache) run() {
for r := range c.requests {
_ = c.realCache.Put(r.anchor, r.key, r.duration, r.files)
}
c.wg.Done()
}
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