Example #1
0
func newFromConfig(ld blobserver.Loader, config jsonconfig.Obj) (storage blobserver.Storage, err os.Error) {
	sto := &replicaStorage{
		SimpleBlobHubPartitionMap: &blobserver.SimpleBlobHubPartitionMap{},
	}
	sto.replicaPrefixes = config.RequiredList("backends")
	nReplicas := len(sto.replicaPrefixes)
	sto.minWritesForSuccess = config.OptionalInt("minWritesForSuccess", nReplicas)
	if err := config.Validate(); err != nil {
		return nil, err
	}
	if nReplicas == 0 {
		return nil, os.NewError("replica: need at least one replica")
	}
	if sto.minWritesForSuccess == 0 {
		sto.minWritesForSuccess = nReplicas
	}
	sto.replicas = make([]blobserver.Storage, nReplicas)
	for i, prefix := range sto.replicaPrefixes {
		replicaSto, err := ld.GetStorage(prefix)
		if err != nil {
			return nil, err
		}
		sto.replicas[i] = replicaSto
	}
	return sto, nil
}