56 lines
2.1 KiB
Rust
56 lines
2.1 KiB
Rust
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// Copyright 2015-2019 Parity Technologies (UK) Ltd.
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// This file is part of Parity.
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// Parity is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Parity is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Parity. If not, see <http://www.gnu.org/licenses/>.
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//! When queue limits are reached, decide whether to replace an existing transaction from the pool
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use crate::{pool::Transaction, scoring::Choice};
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/// Encapsulates a transaction to be compared, along with pooled transactions from the same sender
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pub struct ReplaceTransaction<'a, T> {
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/// The transaction to be compared for replacement
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pub transaction: &'a Transaction<T>,
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/// Other transactions currently in the pool for the same sender
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pub pooled_by_sender: Option<&'a [Transaction<T>]>,
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}
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impl<'a, T> ReplaceTransaction<'a, T> {
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/// Creates a new `ReplaceTransaction`
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pub fn new(
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transaction: &'a Transaction<T>,
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pooled_by_sender: Option<&'a [Transaction<T>]>,
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) -> Self {
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ReplaceTransaction {
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transaction,
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pooled_by_sender,
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}
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}
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}
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impl<'a, T> ::std::ops::Deref for ReplaceTransaction<'a, T> {
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type Target = Transaction<T>;
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fn deref(&self) -> &Self::Target {
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&self.transaction
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}
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}
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/// Chooses whether a new transaction should replace an existing transaction if the pool is full.
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pub trait ShouldReplace<T> {
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/// Decides if `new` should push out `old` transaction from the pool.
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///
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/// NOTE returning `InsertNew` here can lead to some transactions being accepted above pool limits.
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fn should_replace(&self, old: &ReplaceTransaction<T>, new: &ReplaceTransaction<T>) -> Choice;
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}
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