///The function removes and returns the expired artifact downloads from the
/// artifact download list.
The function removes and returns the expired artifact downloads from the
artifact download list.
The function removes and returns the expired artifact downloads from the artifact download list .
fn prune_expired_downloads(&mut self) -> Vec<(ArtifactId, CryptoHash)> {
        let now_instant = Instant::now();
        // 2-phase pruning of the expired downloads:
        //
        // In the first phase, the list of time-ordered expired-instants is traversed,
        // collecting instants until the current time instant is passed.
        //
        // In the second phase, artifacts are extracted from the
        // expired-instants collected in the first phase.
        //
        // Finally, the expired-instant entries are deleted.
        // Collect the expired instances.
        let expired_instances: Vec<_> = self
            .expiry_index
            .iter()
            .take_while(|(expiry_instant, _)| **expiry_instant < now_instant)
            .map(|(expiry_instant, expired_artifacts)| (*expiry_instant, expired_artifacts.clone()))
            .collect();
        // Extract artifact IDs from the expired instances.
        let mut expired_artifacts = Vec::new();
        expired_instances
            .iter()
            .for_each(|(_expiry_instant, integrity_hashes)| {
                integrity_hashes.iter().for_each(|integrity_hash| {
                    let index_integrity_hash = integrity_hash.clone();
                    let id = self.artifacts.remove(integrity_hash).unwrap().artifact_id;
                    expired_artifacts.push((id, index_integrity_hash));
                });
            });
        // Remove the expired instances.
        expired_instances.into_iter().for_each(|(instant, _)| {
            self.expiry_index.remove(&instant);
        });
        expired_artifacts
    }
fn prune_expired_downloads ( & mut self ) -> Vec < ( ArtifactId , CryptoHash ) > { let now_instant = Instant :: now ( ) ; // 2-phase pruning of the expired downloads: // // In the first phase, the list of time-ordered expired-instants is traversed, // collecting instants until the current time instant is passed. // // In the second phase, artifacts are extracted from the // expired-instants collected in the first phase. // // Finally, the expired-instant entries are deleted. // Collect the expired instances. let expired_instances : Vec < _ > = self . expiry_index . iter ( ) . take_while ( | ( expiry_instant , _ ) | * * expiry_instant < now_instant ) . map ( | ( expiry_instant , expired_artifacts ) | ( * expiry_instant , expired_artifacts . clone ( ) ) ) . collect ( ) ; // Extract artifact IDs from the expired instances. let mut expired_artifacts = Vec :: new ( ) ; expired_instances . iter ( ) . for_each ( | ( _expiry_instant , integrity_hashes ) | { integrity_hashes . iter ( ) . for_each ( | integrity_hash | { let index_integrity_hash = integrity_hash . clone ( ) ; let id = self . artifacts . remove ( integrity_hash ) . unwrap ( ) . artifact_id ; expired_artifacts . push ( ( id , index_integrity_hash ) ) ; } ) ; } ) ; // Remove the expired instances. expired_instances . into_iter ( ) . for_each ( | ( instant , _ ) | { self . expiry_index . remove ( & instant ) ; } ) ; expired_artifacts }
The function removes and returns the expired artifact downloads from the
artifact download list.
The function removes and returns the expired artifact downloads from the artifact download list .
&mut self