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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 (
"reflect"
"strconv"
"sync/atomic"
"cuelang.org/go/internal/golangorgx/gopls/protocol/command"
"cuelang.org/go/internal/golangorgx/tools/imports"
"cuelang.org/go/internal/golangorgx/tools/memoize"
)
// 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(),
modCache: &sharedModCache{
caches: make(map[string]*imports.DirInfoCache),
timers: make(map[string]*refreshTimer),
},
}
return c
}
// A Cache holds content that is shared across multiple gopls sessions.
type Cache struct {
id string
// store holds cached calculations.
//
// TODO(rfindley): at this point, these are not important, as we've moved our
// content-addressable cache to the file system (the filecache package). It
// is unlikely that this shared cache provides any shared value. We should
// consider removing it, replacing current uses with a simpler futures cache,
// as we've done for e.g. type-checked packages.
store *memoize.Store
// memoizedFS holds a shared file.Source that caches reads.
//
// Reads are invalidated when *any* session gets a didChangeWatchedFile
// notification. This is fine: it is the responsibility of memoizedFS to hold
// our best knowledge of the current file system state.
*memoizedFS
// modCache holds the
modCache *sharedModCache
}
var cacheIndex, sessionIndex, viewIndex int64
func (c *Cache) ID() string { return c.id }
func (c *Cache) MemStats() map[reflect.Type]int { return c.store.Stats() }
// FileStats returns information about the set of files stored in the cache.
// It is intended for debugging only.
func (c *Cache) FileStats() (stats command.FileStats) {
stats.Total, stats.Largest, stats.Errs = c.fileStats()
return
}
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