Struct libpijul::pristine::sanakirja::GenericTxn

pub struct GenericTxn<T: LoadPage<Error = Error>> { /* fields omitted */ }

A transaction, used both for mutable and immutable transactions, depending on type parameter T.

In Sanakirja, both sanakirja::Txn and sanakirja::MutTxn implement sanakirja::Transaction, explaining our implementation of TxnT for Txn<T> for all T: sanakirja::Transaction. This covers both mutable and immutable transactions in a single implementation.

Implementations

impl GenericTxn<Txn<Arc<Env>>>

pub fn check_database(&self)

impl GenericTxn<Txn<Arc<Env>>>

pub fn load_const_channel(
    &self,
    name: &str
) -> Result<Option<Channel>, SanakirjaError>

Trait Implementations

impl<T: LoadPage<Error = Error>> ChannelTxnT for GenericTxn<T>

type Channel = Channel

fn graph<'a>(
    &self,
    c: &'a Self::Channel
) -> &'a Db<Vertex<ChangeId>, SerializedEdge>

fn name<'a>(&self, c: &'a Self::Channel) -> &'a str

fn apply_counter(&self, channel: &Self::Channel) -> u64

fn last_modified(&self, channel: &Self::Channel) -> u64

fn changes<'a>(&self, channel: &'a Self::Channel) -> &'a Self::Changeset

fn rev_changes<'a>(&self, channel: &'a Self::Channel) -> &'a Self::RevChangeset

type Changeset = Db<ChangeId, L64>

type RevChangeset = Db_<L64, Pair<ChangeId, SerializedMerkle>, Page<L64, Pair<ChangeId, SerializedMerkle>>>

fn get_changeset(
    &self,
    channel: &Self::Changeset,
    c: &ChangeId
) -> Result<Option<&L64>, TxnErr<Self::GraphError>>

fn get_revchangeset(
    &self,
    revchanges: &Self::RevChangeset,
    c: &L64
) -> Result<Option<&Pair<ChangeId, SerializedMerkle>>, TxnErr<Self::GraphError>>

type ChangesetCursor = Cursor<ChangeId, L64, Page<ChangeId, L64>>

fn cursor_changeset<'a>(
    &'a self,
    channel: &Self::Changeset,
    pos: Option<ChangeId>
) -> Result<Cursor<Self, &'a Self, Self::ChangesetCursor, ChangeId, L64>, TxnErr<SanakirjaError>>

type RevchangesetCursor = Cursor<L64, Pair<ChangeId, SerializedMerkle>, Page<L64, Pair<ChangeId, SerializedMerkle>>>

fn cursor_revchangeset_ref<'a, RT: Deref<Target = Self>>(
    txn: RT,
    channel: &Self::RevChangeset,
    pos: Option<L64>
) -> Result<Cursor<Self, RT, Self::RevchangesetCursor, L64, Pair<ChangeId, SerializedMerkle>>, TxnErr<SanakirjaError>>

fn rev_cursor_revchangeset<'a>(
    &'a self,
    channel: &Self::RevChangeset,
    pos: Option<L64>
) -> Result<RevCursor<Self, &'a Self, Self::RevchangesetCursor, L64, Pair<ChangeId, SerializedMerkle>>, TxnErr<SanakirjaError>>

fn cursor_revchangeset_next(
    &self,
    cursor: &mut Self::RevchangesetCursor
) -> Result<Option<(&L64, &Pair<ChangeId, SerializedMerkle>)>, TxnErr<SanakirjaError>>

fn cursor_revchangeset_prev(
    &self,
    cursor: &mut Self::RevchangesetCursor
) -> Result<Option<(&L64, &Pair<ChangeId, SerializedMerkle>)>, TxnErr<SanakirjaError>>

fn cursor_changeset_next(
    &self,
    cursor: &mut Self::ChangesetCursor
) -> Result<Option<(&ChangeId, &L64)>, TxnErr<SanakirjaError>>

fn cursor_changeset_prev(
    &self,
    cursor: &mut Self::ChangesetCursor
) -> Result<Option<(&ChangeId, &L64)>, TxnErr<SanakirjaError>>

type States = Db_<SerializedMerkle, L64, Page<SerializedMerkle, L64>>

fn states<'a>(&self, channel: &'a Self::Channel) -> &'a Self::States

fn channel_has_state(
    &self,
    channel: &Self::States,
    m: &SerializedMerkle
) -> Result<Option<L64>, TxnErr<Self::GraphError>>

impl<T: LoadPage<Error = Error>> DepsTxnT for GenericTxn<T>

type DepsError = SanakirjaError

type Dep = Db<ChangeId, ChangeId>

type Revdep = Db<ChangeId, ChangeId>

fn get_dep<'txn>(
    &'txn self,
    key: &ChangeId,
    value: Option<&ChangeId>
) -> Result<Option<&'txn ChangeId>, TxnErr<Self::DepsError>>

fn get_revdep<'txn>(
    &'txn self,
    key: &ChangeId,
    value: Option<&ChangeId>
) -> Result<Option<&'txn ChangeId>, TxnErr<Self::DepsError>>

type DepCursor = Cursor<ChangeId, ChangeId, Page<ChangeId, ChangeId>>

fn cursor_dep<'txn>(
    &'txn self,
    db: &Self::Dep,
    pos: Option<(&ChangeId, Option<&ChangeId>)>
) -> Result<Cursor<Self, &'txn Self, Self::DepCursor, ChangeId, ChangeId>, TxnErr<SanakirjaError>>

fn cursor_dep_ref<RT: Deref<Target = Self>>(
    txn: RT,
    db: &Self::Dep,
    pos: Option<(&ChangeId, Option<&ChangeId>)>
) -> Result<Cursor<Self, RT, Self::DepCursor, ChangeId, ChangeId>, TxnErr<SanakirjaError>>

fn cursor_dep_next<'txn>(
    &'txn self,
    cursor: &mut Self::DepCursor
) -> Result<Option<(&'txn ChangeId, &'txn ChangeId)>, TxnErr<SanakirjaError>>

fn cursor_dep_prev<'txn>(
    &'txn self,
    cursor: &mut Self::DepCursor
) -> Result<Option<(&'txn ChangeId, &'txn ChangeId)>, TxnErr<SanakirjaError>>

fn iter_dep_ref<RT: Deref<Target = Self> + Clone>(
    txn: RT,
    p: &ChangeId
) -> Result<Cursor<Self, RT, Self::DepCursor, ChangeId, ChangeId>, TxnErr<Self::DepsError>>

fn get_touched_files<'txn>(
    &'txn self,
    key: &Position<ChangeId>,
    value: Option<&ChangeId>
) -> Result<Option<&'txn ChangeId>, TxnErr<Self::DepsError>>

fn get_rev_touched_files<'txn>(
    &'txn self,
    key: &ChangeId,
    value: Option<&Position<ChangeId>>
) -> Result<Option<&'txn Position<ChangeId>>, TxnErr<Self::DepsError>>

type Touched_files = Db<Position<ChangeId>, ChangeId>

type Rev_touched_files = Db<ChangeId, Position<ChangeId>>

type Touched_filesCursor = Cursor<Position<ChangeId>, ChangeId, Page<Position<ChangeId>, ChangeId>>

fn cursor_touched_files<'txn>(
    &'txn self,
    db: &Self::Touched_files,
    pos: Option<(&Position<ChangeId>, Option<&ChangeId>)>
) -> Result<Cursor<Self, &'txn Self, Self::Touched_filesCursor, Position<ChangeId>, ChangeId>, TxnErr<SanakirjaError>>

fn cursor_touched_files_next<'txn>(
    &'txn self,
    cursor: &mut Self::Touched_filesCursor
) -> Result<Option<(&'txn Position<ChangeId>, &'txn ChangeId)>, TxnErr<SanakirjaError>>

fn cursor_touched_files_prev<'txn>(
    &'txn self,
    cursor: &mut Self::Touched_filesCursor
) -> Result<Option<(&'txn Position<ChangeId>, &'txn ChangeId)>, TxnErr<SanakirjaError>>

fn iter_touched_files<'txn>(
    &'txn self,
    k: &Position<ChangeId>,
    v: Option<&ChangeId>
) -> Result<Cursor<Self, &'txn Self, Self::Touched_filesCursor, Position<ChangeId>, ChangeId>, TxnErr<SanakirjaError>>

type Rev_touched_filesCursor = Cursor<ChangeId, Position<ChangeId>, Page<ChangeId, Position<ChangeId>>>

fn cursor_rev_touched_files<'txn>(
    &'txn self,
    db: &Self::Rev_touched_files,
    pos: Option<(&ChangeId, Option<&Position<ChangeId>>)>
) -> Result<Cursor<Self, &'txn Self, Self::Rev_touched_filesCursor, ChangeId, Position<ChangeId>>, TxnErr<SanakirjaError>>

fn cursor_rev_touched_files_next<'txn>(
    &'txn self,
    cursor: &mut Self::Rev_touched_filesCursor
) -> Result<Option<(&'txn ChangeId, &'txn Position<ChangeId>)>, TxnErr<SanakirjaError>>

fn cursor_rev_touched_files_prev<'txn>(
    &'txn self,
    cursor: &mut Self::Rev_touched_filesCursor
) -> Result<Option<(&'txn ChangeId, &'txn Position<ChangeId>)>, TxnErr<SanakirjaError>>

fn iter_rev_touched_files<'txn>(
    &'txn self,
    k: &ChangeId,
    v: Option<&Position<ChangeId>>
) -> Result<Cursor<Self, &'txn Self, Self::Rev_touched_filesCursor, ChangeId, Position<ChangeId>>, TxnErr<SanakirjaError>>

fn iter_revdep(
    &self,
    k: &ChangeId
) -> Result<Cursor<Self, &Self, Self::DepCursor, ChangeId, ChangeId>, TxnErr<Self::DepsError>>

fn iter_dep(
    &self,
    k: &ChangeId
) -> Result<Cursor<Self, &Self, Self::DepCursor, ChangeId, ChangeId>, TxnErr<Self::DepsError>>

fn iter_touched(
    &self,
    k: &Position<ChangeId>
) -> Result<Cursor<Self, &Self, Self::Touched_filesCursor, Position<ChangeId>, ChangeId>, TxnErr<Self::DepsError>>

fn iter_rev_touched(
    &self,
    k: &ChangeId
) -> Result<Cursor<Self, &Self, Self::Rev_touched_filesCursor, ChangeId, Position<ChangeId>>, TxnErr<Self::DepsError>>

impl<T: LoadPage<Error = Error>> GraphIter for GenericTxn<T>

type GraphCursor = Cursor<Vertex<ChangeId>, SerializedEdge, Page<Vertex<ChangeId>, SerializedEdge>>

fn iter_graph(
    &self,
    g: &Self::Graph,
    s: Option<&Vertex<ChangeId>>
) -> Result<Self::GraphCursor, TxnErr<Self::GraphError>>

fn next_graph<'txn>(
    &'txn self,
    _: &Self::Graph,
    a: &mut Self::GraphCursor
) -> Option<Result<(&'txn Vertex<ChangeId>, &'txn SerializedEdge), TxnErr<Self::GraphError>>>

impl<T: LoadPage<Error = Error>> GraphTxnT for GenericTxn<T>

type Graph = Db<Vertex<ChangeId>, SerializedEdge>

type GraphError = SanakirjaError

fn get_graph<'txn>(
    &'txn self,
    db: &Self::Graph,
    key: &Vertex<ChangeId>,
    value: Option<&SerializedEdge>
) -> Result<Option<&'txn SerializedEdge>, TxnErr<Self::GraphError>>

fn get_external(
    &self,
    p: &ChangeId
) -> Result<Option<&SerializedHash>, TxnErr<Self::GraphError>>

Returns the external hash of an internal change identifier, if the change is known.

fn get_internal(
    &self,
    p: &SerializedHash
) -> Result<Option<&ChangeId>, TxnErr<Self::GraphError>>

Returns the internal change identifier of change with external hash hash, if the change is known.

type Adj = Adj

fn init_adj(
    &self,
    g: &Self::Graph,
    key: Vertex<ChangeId>,
    dest: Position<ChangeId>,
    min_flag: EdgeFlags,
    max_flag: EdgeFlags
) -> Result<Self::Adj, TxnErr<Self::GraphError>>

fn next_adj<'a>(
    &'a self,
    _: &Self::Graph,
    a: &mut Self::Adj
) -> Option<Result<&'a SerializedEdge, TxnErr<Self::GraphError>>>

fn find_block(
    &self,
    graph: &Self::Graph,
    p: Position<ChangeId>
) -> Result<&Vertex<ChangeId>, BlockError<Self::GraphError>>

fn find_block_end(
    &self,
    graph: &Self::Graph,
    p: Position<ChangeId>
) -> Result<&Vertex<ChangeId>, BlockError<Self::GraphError>>

impl<T: LoadPage<Error = Error>> Send for GenericTxn<T>

This is actually safe because the only non-Send fields are open_channels and open_remotes, but we can’t do anything with a ChannelRef whose transaction has been moved to another thread.

impl<T: LoadPage<Error = Error>> TreeTxnT for GenericTxn<T>

type TreeError = SanakirjaError

type Inodes = Db<Inode, Position<ChangeId>>

type Revinodes = Db<Position<ChangeId>, Inode>

fn get_inodes<'txn>(
    &'txn self,
    key: &Inode,
    value: Option<&Position<ChangeId>>
) -> Result<Option<&'txn Position<ChangeId>>, TxnErr<Self::TreeError>>

fn get_revinodes<'txn>(
    &'txn self,
    key: &Position<ChangeId>,
    value: Option<&Inode>
) -> Result<Option<&'txn Inode>, TxnErr<Self::TreeError>>

fn cursor_inodes<'txn>(
    &'txn self,
    db: &Self::Inodes,
    pos: Option<(&Inode, Option<&Position<ChangeId>>)>
) -> Result<Cursor<Self, &'txn Self, Self::InodesCursor, Inode, Position<ChangeId>>, TxnErr<SanakirjaError>>

fn cursor_inodes_next<'txn>(
    &'txn self,
    cursor: &mut Self::InodesCursor
) -> Result<Option<(&'txn Inode, &'txn Position<ChangeId>)>, TxnErr<SanakirjaError>>

fn cursor_inodes_prev<'txn>(
    &'txn self,
    cursor: &mut Self::InodesCursor
) -> Result<Option<(&'txn Inode, &'txn Position<ChangeId>)>, TxnErr<SanakirjaError>>

fn cursor_revinodes<'txn>(
    &'txn self,
    db: &Self::Revinodes,
    pos: Option<(&Position<ChangeId>, Option<&Inode>)>
) -> Result<Cursor<Self, &'txn Self, Self::RevinodesCursor, Position<ChangeId>, Inode>, TxnErr<SanakirjaError>>

fn cursor_revinodes_next<'txn>(
    &'txn self,
    cursor: &mut Self::RevinodesCursor
) -> Result<Option<(&'txn Position<ChangeId>, &'txn Inode)>, TxnErr<SanakirjaError>>

fn cursor_revinodes_prev<'txn>(
    &'txn self,
    cursor: &mut Self::RevinodesCursor
) -> Result<Option<(&'txn Position<ChangeId>, &'txn Inode)>, TxnErr<SanakirjaError>>

type Tree = Db_<PathId, Inode, Page<PathId, Inode>>

fn get_tree<'txn>(
    &'txn self,
    key: &PathId,
    value: Option<&Inode>
) -> Result<Option<&'txn Inode>, TxnErr<Self::TreeError>>

type TreeCursor = Cursor<PathId, Inode, Page<PathId, Inode>>

fn cursor_tree<'txn>(
    &'txn self,
    db: &Self::Tree,
    pos: Option<(&PathId, Option<&Inode>)>
) -> Result<Cursor<Self, &'txn Self, Self::TreeCursor, PathId, Inode>, TxnErr<SanakirjaError>>

fn cursor_tree_next<'txn>(
    &'txn self,
    cursor: &mut Self::TreeCursor
) -> Result<Option<(&'txn PathId, &'txn Inode)>, TxnErr<SanakirjaError>>

fn cursor_tree_prev<'txn>(
    &'txn self,
    cursor: &mut Self::TreeCursor
) -> Result<Option<(&'txn PathId, &'txn Inode)>, TxnErr<SanakirjaError>>

fn iter_tree<'txn>(
    &'txn self,
    k: &PathId,
    v: Option<&Inode>
) -> Result<Cursor<Self, &'txn Self, Self::TreeCursor, PathId, Inode>, TxnErr<SanakirjaError>>

type RevtreeCursor = Cursor<Inode, PathId, Page<Inode, PathId>>

fn cursor_revtree<'txn>(
    &'txn self,
    db: &Self::Revtree,
    pos: Option<(&Inode, Option<&PathId>)>
) -> Result<Cursor<Self, &'txn Self, Self::RevtreeCursor, Inode, PathId>, TxnErr<SanakirjaError>>

fn cursor_revtree_next<'txn>(
    &'txn self,
    cursor: &mut Self::RevtreeCursor
) -> Result<Option<(&'txn Inode, &'txn PathId)>, TxnErr<SanakirjaError>>

fn cursor_revtree_prev<'txn>(
    &'txn self,
    cursor: &mut Self::RevtreeCursor
) -> Result<Option<(&'txn Inode, &'txn PathId)>, TxnErr<SanakirjaError>>

fn iter_revtree<'txn>(
    &'txn self,
    k: &Inode,
    v: Option<&PathId>
) -> Result<Cursor<Self, &'txn Self, Self::RevtreeCursor, Inode, PathId>, TxnErr<SanakirjaError>>

type Revtree = Db_<Inode, PathId, Page<Inode, PathId>>

fn get_revtree<'txn>(
    &'txn self,
    key: &Inode,
    value: Option<&PathId>
) -> Result<Option<&'txn PathId>, TxnErr<Self::TreeError>>

type Partials = Db_<SmallStr, Position<ChangeId>, Page<SmallStr, Position<ChangeId>>>

type PartialsCursor = Cursor<SmallStr, Position<ChangeId>, Page<SmallStr, Position<ChangeId>>>

fn cursor_partials<'txn>(
    &'txn self,
    db: &Self::Partials,
    pos: Option<(&SmallStr, Option<&Position<ChangeId>>)>
) -> Result<Cursor<Self, &'txn Self, Self::PartialsCursor, SmallStr, Position<ChangeId>>, TxnErr<SanakirjaError>>

fn cursor_partials_next<'txn>(
    &'txn self,
    cursor: &mut Self::PartialsCursor
) -> Result<Option<(&'txn SmallStr, &'txn Position<ChangeId>)>, TxnErr<SanakirjaError>>

fn cursor_partials_prev<'txn>(
    &'txn self,
    cursor: &mut Self::PartialsCursor
) -> Result<Option<(&'txn SmallStr, &'txn Position<ChangeId>)>, TxnErr<SanakirjaError>>

type InodesCursor = Cursor<Inode, Position<ChangeId>, Page<Inode, Position<ChangeId>>>

fn iter_inodes(
    &self
) -> Result<Cursor<Self, &Self, Self::InodesCursor, Inode, Position<ChangeId>>, TxnErr<Self::TreeError>>

type RevinodesCursor = Cursor<Position<ChangeId>, Inode, Page<Position<ChangeId>, Inode>>

fn iter_revinodes(
    &self
) -> Result<Cursor<Self, &Self, Self::RevinodesCursor, Position<ChangeId>, Inode>, TxnErr<SanakirjaError>>

fn iter_partials<'txn>(
    &'txn self,
    k: &str
) -> Result<Cursor<Self, &'txn Self, Self::PartialsCursor, SmallStr, Position<ChangeId>>, TxnErr<SanakirjaError>>

impl<T: LoadPage<Error = Error>> TxnT for GenericTxn<T>

fn hash_from_prefix(
    &self,
    s: &str
) -> Result<(Hash, ChangeId), HashPrefixError<Self::GraphError>>

fn hash_from_prefix_remote<'txn>(
    &'txn self,
    remote: &RemoteRef<Self>,
    s: &str
) -> Result<Hash, HashPrefixError<Self::GraphError>>

fn load_channel(
    &self,
    name: &str
) -> Result<Option<ChannelRef<Self>>, TxnErr<Self::GraphError>>

fn load_remote(
    &self,
    name: &str
) -> Result<Option<RemoteRef<Self>>, TxnErr<Self::GraphError>>

type Channels = Db_<SmallStr, T6, Page<SmallStr, T6>>

type ChannelsCursor = Cursor<SmallStr, T6, Page<SmallStr, T6>>

fn cursor_channels<'txn>(
    &'txn self,
    db: &Self::Channels,
    pos: Option<(&SmallStr, Option<&T6>)>
) -> Result<Cursor<Self, &'txn Self, Self::ChannelsCursor, SmallStr, T6>, TxnErr<SanakirjaError>>

fn cursor_channels_next<'txn>(
    &'txn self,
    cursor: &mut Self::ChannelsCursor
) -> Result<Option<(&'txn SmallStr, &'txn T6)>, TxnErr<SanakirjaError>>

fn cursor_channels_prev<'txn>(
    &'txn self,
    cursor: &mut Self::ChannelsCursor
) -> Result<Option<(&'txn SmallStr, &'txn T6)>, TxnErr<SanakirjaError>>

fn iter_channels<'txn>(
    &'txn self,
    start: &str
) -> Result<ChannelIterator<'txn, Self>, TxnErr<Self::GraphError>>

Iterate a function over all channels. The loop stops the first time f returns false.

type Remotes = Db_<SmallStr, T3, Page<SmallStr, T3>>

type RemotesCursor = Cursor<SmallStr, T3, Page<SmallStr, T3>>

fn cursor_remotes<'txn>(
    &'txn self,
    db: &Self::Remotes,
    pos: Option<(&SmallStr, Option<&T3>)>
) -> Result<Cursor<Self, &'txn Self, Self::RemotesCursor, SmallStr, T3>, TxnErr<SanakirjaError>>

fn cursor_remotes_next<'txn>(
    &'txn self,
    cursor: &mut Self::RemotesCursor
) -> Result<Option<(&'txn SmallStr, &'txn T3)>, TxnErr<SanakirjaError>>

fn cursor_remotes_prev<'txn>(
    &'txn self,
    cursor: &mut Self::RemotesCursor
) -> Result<Option<(&'txn SmallStr, &'txn T3)>, TxnErr<SanakirjaError>>

fn iter_remotes<'txn>(
    &'txn self,
    start: &str
) -> Result<RemotesIterator<'txn, Self>, TxnErr<Self::GraphError>>

type Remote = Db_<L64, Pair<SerializedHash, SerializedMerkle>, Page<L64, Pair<SerializedHash, SerializedMerkle>>>

type Revremote = Db_<SerializedHash, L64, Page<SerializedHash, L64>>

type Remotestates = Db_<SerializedMerkle, L64, Page<SerializedMerkle, L64>>

type RemoteCursor = Cursor<L64, Pair<SerializedHash, SerializedMerkle>, Page<L64, Pair<SerializedHash, SerializedMerkle>>>

fn cursor_remote<'txn>(
    &'txn self,
    db: &Self::Remote,
    pos: Option<(&L64, Option<&Pair<SerializedHash, SerializedMerkle>>)>
) -> Result<Cursor<Self, &'txn Self, Self::RemoteCursor, L64, Pair<SerializedHash, SerializedMerkle>>, TxnErr<SanakirjaError>>

fn cursor_remote_next<'txn>(
    &'txn self,
    cursor: &mut Self::RemoteCursor
) -> Result<Option<(&'txn L64, &'txn Pair<SerializedHash, SerializedMerkle>)>, TxnErr<SanakirjaError>>

fn cursor_remote_prev<'txn>(
    &'txn self,
    cursor: &mut Self::RemoteCursor
) -> Result<Option<(&'txn L64, &'txn Pair<SerializedHash, SerializedMerkle>)>, TxnErr<SanakirjaError>>

fn rev_cursor_remote<'txn>(
    &'txn self,
    db: &Self::Remote,
    pos: Option<(&L64, Option<&Pair<SerializedHash, SerializedMerkle>>)>
) -> Result<RevCursor<Self, &'txn Self, Self::RemoteCursor, L64, Pair<SerializedHash, SerializedMerkle>>, TxnErr<SanakirjaError>>

fn iter_remote<'txn>(
    &'txn self,
    remote: &Self::Remote,
    k: u64
) -> Result<Cursor<Self, &'txn Self, Self::RemoteCursor, L64, Pair<SerializedHash, SerializedMerkle>>, TxnErr<Self::GraphError>>

fn iter_rev_remote<'txn>(
    &'txn self,
    remote: &Self::Remote,
    k: Option<L64>
) -> Result<RevCursor<Self, &'txn Self, Self::RemoteCursor, L64, Pair<SerializedHash, SerializedMerkle>>, TxnErr<Self::GraphError>>

fn get_remote(
    &mut self,
    name: &str
) -> Result<Option<RemoteRef<Self>>, TxnErr<Self::GraphError>>

fn last_remote(
    &self,
    remote: &Self::Remote
) -> Result<Option<(u64, &Pair<SerializedHash, SerializedMerkle>)>, TxnErr<Self::GraphError>>

fn get_remote_state(
    &self,
    remote: &Self::Remote,
    n: u64
) -> Result<Option<(u64, &Pair<SerializedHash, SerializedMerkle>)>, TxnErr<Self::GraphError>>

fn remote_has_change(
    &self,
    remote: &RemoteRef<Self>,
    hash: &SerializedHash
) -> Result<bool, TxnErr<Self::GraphError>>

fn remote_has_state(
    &self,
    remote: &RemoteRef<Self>,
    m: &SerializedMerkle
) -> Result<bool, TxnErr<Self::GraphError>>