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// Copyright 2019 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package cache
import (
// New Creates a new cache for gopls operation results, using the given file
// set, shared store, and session options.
// Both the fset and store may be nil, but if store is non-nil so must be fset
// (and they must always be used together), otherwise it may be possible to get
// cached data referencing token.Pos values not mapped by the FileSet.
func New(store *memoize.Store) *Cache {
index := atomic.AddInt64(&cacheIndex, 1)
if store == nil {
store = &memoize.Store{}
c := &Cache{
id: strconv.FormatInt(index, 10),
store: store,
memoizedFS: newMemoizedFS(),
return c
// A Cache holds caching stores that are bundled together for consistency.
// TODO(rfindley): once fset and store need not be bundled together, the Cache
// type can be eliminated.
type Cache struct {
id string
store *memoize.Store
*memoizedFS // implements source.FileSource
// NewSession creates a new gopls session with the given cache and options overrides.
// The provided optionsOverrides may be nil.
// TODO(rfindley): move this to session.go.
func NewSession(ctx context.Context, c *Cache) *Session {
index := atomic.AddInt64(&sessionIndex, 1)
s := &Session{
id: strconv.FormatInt(index, 10),
cache: c,
gocmdRunner: &gocommand.Runner{},
overlayFS: newOverlayFS(c),
parseCache: newParseCache(1 * time.Minute), // keep recently parsed files for a minute, to optimize typing CPU
viewMap: make(map[protocol.DocumentURI]*View),
event.Log(ctx, "New session", KeyCreateSession.Of(s))
return s
var cacheIndex, sessionIndex, viewIndex int64
func (c *Cache) ID() string { return }
func (c *Cache) MemStats() map[reflect.Type]int { return }
// FileStats returns information about the set of files stored in the cache.
// It is intended for debugging only.
func (c *Cache) FileStats() (files, largest, errs int) {
return c.fileStats()