package erasure_coding import ( "github.com/chrislusf/seaweedfs/weed/pb/master_pb" "github.com/chrislusf/seaweedfs/weed/storage/needle" ) // data structure used in master type EcVolumeInfo struct { VolumeId needle.VolumeId Collection string ShardBits ShardBits } func NewEcVolumeInfo(collection string, vid needle.VolumeId, shardBits ShardBits) *EcVolumeInfo { return &EcVolumeInfo{ Collection: collection, VolumeId: vid, ShardBits: shardBits, } } func (ecInfo *EcVolumeInfo) AddShardId(id ShardId) { ecInfo.ShardBits = ecInfo.ShardBits.AddShardId(id) } func (ecInfo *EcVolumeInfo) RemoveShardId(id ShardId) { ecInfo.ShardBits = ecInfo.ShardBits.RemoveShardId(id) } func (ecInfo *EcVolumeInfo) HasShardId(id ShardId) bool { return ecInfo.ShardBits.HasShardId(id) } func (ecInfo *EcVolumeInfo) ShardIds() (ret []ShardId) { return ecInfo.ShardBits.ShardIds() } func (ecInfo *EcVolumeInfo) ShardIdCount() (count int) { return ecInfo.ShardBits.ShardIdCount() } func (ecInfo *EcVolumeInfo) Minus(other *EcVolumeInfo) (*EcVolumeInfo) { ret := &EcVolumeInfo{ VolumeId: ecInfo.VolumeId, Collection: ecInfo.Collection, ShardBits: ecInfo.ShardBits.Minus(other.ShardBits), } return ret } func (ecInfo *EcVolumeInfo) ToVolumeEcShardInformationMessage() (ret *master_pb.VolumeEcShardInformationMessage) { return &master_pb.VolumeEcShardInformationMessage{ Id: uint32(ecInfo.VolumeId), EcIndexBits: uint32(ecInfo.ShardBits), Collection: ecInfo.Collection, } } type ShardBits uint32 // use bits to indicate the shard id, use 32 bits just for possible future extension func (b ShardBits) AddShardId(id ShardId) ShardBits { return b | (1 << id) } func (b ShardBits) RemoveShardId(id ShardId) ShardBits { return b &^ (1 << id) } func (b ShardBits) HasShardId(id ShardId) bool { return b&(1< 0 } func (b ShardBits) ShardIds() (ret []ShardId) { for i := ShardId(0); i < TotalShardsCount; i++ { if b.HasShardId(i) { ret = append(ret, i) } } return } func (b ShardBits) ShardIdCount() (count int) { for count = 0; b > 0; count++ { b &= b - 1 } return } func (b ShardBits) Minus(other ShardBits) (ShardBits) { return b &^ other }