60 lines
1.7 KiB
Rust
60 lines
1.7 KiB
Rust
use failure::Fallible;
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use taskchampion::Uuid;
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mod inmemory;
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pub(crate) use inmemory::InMemoryStorage;
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#[derive(Clone, PartialEq, Debug)]
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pub(crate) struct Client {
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pub(crate) latest_version_id: Uuid,
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}
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#[derive(Clone, PartialEq, Debug)]
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pub(crate) struct Version {
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pub(crate) version_id: Uuid,
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pub(crate) parent_version_id: Uuid,
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pub(crate) history_segment: Vec<u8>,
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}
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pub(crate) trait StorageTxn {
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/// Get information about the given client
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fn get_client(&mut self, client_id: Uuid) -> Fallible<Option<Client>>;
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/// Create a new client with the given latest_version_id
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fn new_client(&mut self, client_id: Uuid, latest_version_id: Uuid) -> Fallible<()>;
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/// Set the client's latest_version_id
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fn set_client_latest_version_id(
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&mut self,
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client_id: Uuid,
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latest_version_id: Uuid,
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) -> Fallible<()>;
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/// Get a version, indexed by parent version id
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fn get_version_by_parent(
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&mut self,
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client_id: Uuid,
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parent_version_id: Uuid,
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) -> Fallible<Option<Version>>;
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/// Add a version (that must not already exist)
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fn add_version(
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&mut self,
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client_id: Uuid,
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version_id: Uuid,
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parent_version_id: Uuid,
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history_segment: Vec<u8>,
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) -> Fallible<()>;
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/// Commit any changes made in the transaction. It is an error to call this more than
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/// once. It is safe to skip this call for read-only operations.
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fn commit(&mut self) -> Fallible<()>;
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}
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/// A trait for objects able to act as storage. Most of the interesting behavior is in the
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/// [`crate::storage::StorageTxn`] trait.
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pub(crate) trait Storage: Send + Sync {
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/// Begin a transaction
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fn txn<'a>(&'a self) -> Fallible<Box<dyn StorageTxn + 'a>>;
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}
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