diff options
Diffstat (limited to 'src/node.rs')
-rw-r--r-- | src/node.rs | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/src/node.rs b/src/node.rs new file mode 100644 index 0000000..b6a088b --- /dev/null +++ b/src/node.rs @@ -0,0 +1,39 @@ +// +// This Source Code Form is subject to the terms of the Mozilla Public +// License, v. 2.0. If a copy of the MPL was not distributed with this +// file, You can obtain one at http://mozilla.org/MPL/2.0/. +// + +use std::fmt::Debug; + +use crate::id::Id; + +use futures::future::Future; +use futures::stream::Stream; + +/// A "Node" is an object of the (DA)Graph +/// +/// In git-speak, this would be an "Object". +/// +/// +/// # Equality +/// +/// A node might be compared to another node. In git, for example, equality would be the equality +/// of the nodes ids, because objects are non-mutable. +/// +pub trait Node: Debug + PartialEq + Eq { + type Id: Id; + type NodePayload: Debug; + type Error: Debug; + type Payload: Future<Item = Self::NodePayload, Error = Self::Error>; + + /// It should be trivial to get the Id of a Node. + fn id(&self) -> Self::Id; + + /// Fetch the payload of the node. + fn payload(&self) -> Self::Payload; + + /// Fetch the Ids of the parents of this node + fn parent_ids(&self) -> Stream<Item = Self::Id, Error = Self::Error>; +} + |