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// __ _____ __ ___ ___ __ _| |_ ___
// \ \ /\ / / _ \/ _` \ \ / / |/ _` | __/ _ \
// \ V V / __/ (_| |\ V /| | (_| | || __/
// \_/\_/ \___|\__,_| \_/ |_|\__,_|\__\___|
//
// Copyright © 2016 - 2025 Weaviate B.V. All rights reserved.
//
// CONTACT: hello@weaviate.io
//
package classcache
import (
"context"
"fmt"
"slices"
"github.com/weaviate/weaviate/entities/versioned"
)
const classCacheKey = "classCache"
var errorNoClassCache = fmt.Errorf("context does not contain classCache")
func ContextWithClassCache(ctx context.Context) context.Context {
if ctx.Value(classCacheKey) != nil {
return ctx
}
return context.WithValue(ctx, classCacheKey, &classCache{})
}
func RemoveClassFromContext(ctxWithClassCache context.Context, name string) error {
cache, err := extractCache(ctxWithClassCache)
if err != nil {
return err
}
cache.Delete(name)
return nil
}
func ClassesFromContext(ctxWithClassCache context.Context, getter func(names ...string) (map[string]versioned.Class, error), names ...string) (map[string]versioned.Class, error) {
cache, err := extractCache(ctxWithClassCache)
if err != nil {
return nil, err
}
versionedClasses := map[string]versioned.Class{}
notFoundInCtx := []string{}
for _, name := range names {
// collect what is not in context
if entry, ok := cache.Load(name); ok {
versionedClasses[entry.class.Class] = versioned.Class{Class: entry.class, Version: entry.version}
continue
}
notFoundInCtx = append(notFoundInCtx, name)
}
// remove dedup, empty and a void calls if there is non
slices.Sort(notFoundInCtx)
notFoundInCtx = slices.Compact(notFoundInCtx)
if len(notFoundInCtx) == 0 {
return versionedClasses, nil
}
if len(notFoundInCtx) > 1 && notFoundInCtx[0] == "" {
notFoundInCtx = notFoundInCtx[1:]
}
// TODO prevent concurrent getter calls for the same class if it was not loaded,
// get once and share results
vclasses, err := getter(notFoundInCtx...)
if err != nil {
return versionedClasses, err
}
for _, vclass := range vclasses {
// do not replace entry if it was loaded in the meantime by concurrent access
entry, _ := cache.LoadOrStore(vclass.Class.Class, &classCacheEntry{class: vclass.Class, version: vclass.Version})
versionedClasses[entry.class.Class] = versioned.Class{Class: entry.class, Version: entry.version}
}
return versionedClasses, nil
}
func extractCache(ctx context.Context) (*classCache, error) {
value := ctx.Value(classCacheKey)
if value == nil {
return nil, errorNoClassCache
}
cache, ok := value.(*classCache)
if !ok {
return nil, errorNoClassCache
}
return cache, nil
}
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