mirror of
https://github.com/minio/minio
synced 2024-09-30 13:13:56 +00:00
faf013ec84
Existing:
```go
type xlMetaV2 struct {
Versions []xlMetaV2Version `json:"Versions" msg:"Versions"`
}
```
Serialized as regular MessagePack.
```go
//msgp:tuple xlMetaV2VersionHeader
type xlMetaV2VersionHeader struct {
VersionID [16]byte
ModTime int64
Type VersionType
Flags xlFlags
}
```
Serialize as streaming MessagePack, format:
```
int(headerVersion)
int(xlmetaVersion)
int(nVersions)
for each version {
binary blob, xlMetaV2VersionHeader, serialized
binary blob, xlMetaV2Version, serialized.
}
```
xlMetaV2VersionHeader is <= 30 bytes serialized. Deserialized struct
can easily be reused and does not contain pointers, so efficient as a
slice (single allocation)
This allows quickly parsing everything as slices of bytes (no copy).
Versions are always *saved* sorted by modTime, newest *first*.
No more need to sort on load.
* Allows checking if a version exists.
* Allows reading single version without unmarshal all.
* Allows reading latest version of type without unmarshal all.
* Allows reading latest version without unmarshal of all.
* Allows checking if the latest is deleteMarker by reading first entry.
* Allows adding/updating/deleting a version with only header deserialization.
* Reduces allocations on conversion to FileInfo(s).
28 lines
843 B
Go
28 lines
843 B
Go
// Code generated by "stringer -type VersionType -output=xl-storage-format-v2_string.go xl-storage-format-v2.go"; DO NOT EDIT.
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package cmd
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import "strconv"
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func _() {
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// An "invalid array index" compiler error signifies that the constant values have changed.
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// Re-run the stringer command to generate them again.
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var x [1]struct{}
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_ = x[invalidVersionType-0]
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_ = x[ObjectType-1]
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_ = x[DeleteType-2]
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_ = x[LegacyType-3]
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_ = x[lastVersionType-4]
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}
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const _VersionType_name = "invalidVersionTypeObjectTypeDeleteTypeLegacyTypelastVersionType"
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var _VersionType_index = [...]uint8{0, 18, 28, 38, 48, 63}
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func (i VersionType) String() string {
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if i >= VersionType(len(_VersionType_index)-1) {
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return "VersionType(" + strconv.FormatInt(int64(i), 10) + ")"
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}
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return _VersionType_name[_VersionType_index[i]:_VersionType_index[i+1]]
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}
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