39 lines
1.3 KiB
Rust
39 lines
1.3 KiB
Rust
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//! trait for abstracting underlying storage of pubkey and account pairs to be written
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use solana_sdk::{account::ReadableAccount, clock::Slot, pubkey::Pubkey};
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/// abstract access to pubkey, account, slot, target_slot of either:
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/// a. (slot, &[&Pubkey, &ReadableAccount])
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/// b. (slot, &[&Pubkey, &ReadableAccount, Slot]) (we will use this later)
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/// This trait avoids having to allocate redundant data when there is a duplicated slot parameter.
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/// All legacy callers do not have a unique slot per account to store.
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pub trait StorableAccounts<'a, T: ReadableAccount + Sync>: Sync {
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/// pubkey at 'index'
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fn pubkey(&self, index: usize) -> &Pubkey;
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/// account at 'index'
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fn account(&self, index: usize) -> &T;
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/// slot that all accounts are to be written to
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fn target_slot(&self) -> Slot;
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/// true if no accounts to write
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fn is_empty(&self) -> bool;
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/// # accounts to write
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fn len(&self) -> usize;
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}
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impl<'a, T: ReadableAccount + Sync> StorableAccounts<'a, T> for (Slot, &'a [(&'a Pubkey, &'a T)]) {
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fn pubkey(&self, index: usize) -> &Pubkey {
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self.1[index].0
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}
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fn account(&self, index: usize) -> &T {
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self.1[index].1
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}
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fn target_slot(&self) -> Slot {
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self.0
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}
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fn is_empty(&self) -> bool {
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self.1.is_empty()
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}
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fn len(&self) -> usize {
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self.1.len()
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}
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}
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