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As long as only a small fraction of the data in a repository is rewritten, the keepBlobs set will be rather small after cleaning it up. As golang maps do not shrink their memory usage, just copy the contents over to a new map. However, only copy the map if the cleanup removed at least half the entries.
69 lines
1.4 KiB
Go
69 lines
1.4 KiB
Go
package restic
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import "sort"
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// CountedBlobSet is a set of blobs. For each blob it also stores a uint8 value
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// which can be used to track some information. The CountedBlobSet does not use
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// that value in any way. New entries are created with value 0.
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type CountedBlobSet map[BlobHandle]uint8
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// NewCountedBlobSet returns a new CountedBlobSet, populated with ids.
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func NewCountedBlobSet(handles ...BlobHandle) CountedBlobSet {
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m := make(CountedBlobSet)
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for _, h := range handles {
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m[h] = 0
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}
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return m
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}
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// Has returns true iff id is contained in the set.
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func (s CountedBlobSet) Has(h BlobHandle) bool {
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_, ok := s[h]
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return ok
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}
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// Insert adds id to the set.
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func (s CountedBlobSet) Insert(h BlobHandle) {
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s[h] = 0
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}
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// Delete removes id from the set.
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func (s CountedBlobSet) Delete(h BlobHandle) {
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delete(s, h)
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}
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func (s CountedBlobSet) Len() int {
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return len(s)
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}
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// List returns a sorted slice of all BlobHandle in the set.
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func (s CountedBlobSet) List() BlobHandles {
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list := make(BlobHandles, 0, len(s))
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for h := range s {
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list = append(list, h)
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}
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sort.Sort(list)
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return list
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}
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func (s CountedBlobSet) String() string {
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str := s.List().String()
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if len(str) < 2 {
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return "{}"
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}
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return "{" + str[1:len(str)-1] + "}"
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}
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// Copy returns a copy of the CountedBlobSet.
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func (s CountedBlobSet) Copy() CountedBlobSet {
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cp := make(CountedBlobSet, len(s))
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for k, v := range s {
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cp[k] = v
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}
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return cp
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}
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