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blobcache.go
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blobcache.go
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// SPDX-FileCopyrightText: 2023 SAP SE or an SAP affiliate company and Open Component Model contributors.
//
// SPDX-License-Identifier: Apache-2.0
package repocpi
import (
"sync"
"github.com/open-component-model/ocm/pkg/blobaccess"
"github.com/open-component-model/ocm/pkg/errors"
)
type (
BlobCacheEntry = blobaccess.BlobAccess
BlobCacheKey = interface{}
)
type BlobCache interface {
// AddBlobFor stores blobs for added blobs not yet accessible
// by generated access method until version is finally added.
AddBlobFor(acc BlobCacheKey, blob BlobCacheEntry) error
// GetBlobFor retrieves the original blob access for
// a given access specification.
GetBlobFor(acc BlobCacheKey) BlobCacheEntry
RemoveBlobFor(acc BlobCacheKey)
Clear() error
}
type blobCache struct {
lock sync.Mutex
blobcache map[BlobCacheKey]BlobCacheEntry
}
func NewBlobCache() BlobCache {
return &blobCache{
blobcache: map[BlobCacheKey]BlobCacheEntry{},
}
}
func (c *blobCache) RemoveBlobFor(acc BlobCacheKey) {
c.lock.Lock()
defer c.lock.Unlock()
if b := c.blobcache[acc]; b != nil {
b.Close()
delete(c.blobcache, acc)
}
}
func (c *blobCache) AddBlobFor(acc BlobCacheKey, blob BlobCacheEntry) error {
if s, ok := acc.(string); ok && s == "" {
return errors.ErrInvalid("blob key")
}
c.lock.Lock()
defer c.lock.Unlock()
if c.blobcache[acc] == nil {
l, err := blob.Dup()
if err != nil {
return err
}
c.blobcache[acc] = l
}
return nil
}
func (c *blobCache) GetBlobFor(acc BlobCacheKey) BlobCacheEntry {
c.lock.Lock()
defer c.lock.Unlock()
return c.blobcache[acc]
}
func (c *blobCache) Clear() error {
list := errors.ErrList()
c.lock.Lock()
defer c.lock.Unlock()
for _, b := range c.blobcache {
list.Add(b.Close())
}
c.blobcache = map[BlobCacheKey]BlobCacheEntry{}
return list.Result()
}