Struct BlockTierMigrator 

pub struct BlockTierMigrator {
    pub records: HashMap<String, BlockTierRecord>,
    pub policy: MigrationPolicy,
}

Manages migration of blocks between storage tiers based on access patterns and a configurable MigrationPolicy.

Fields

records: HashMap<String, BlockTierRecord>

Tracked block records keyed by CID.

policy: MigrationPolicy

Active migration policy.

Implementations

impl BlockTierMigrator

pub fn new(policy: MigrationPolicy) -> Self

Create a new migrator with the given policy.

pub fn register( &mut self, cid: String, tier: StorageTier, size_bytes: u64, now_secs: u64, )

Register a new block in the given tier.

If a block with the same CID already exists it is overwritten.

pub fn record_access(&mut self, cid: &str, now_secs: u64)

Record an access for a block.

Updates last_accessed_secs, increments access_count, and promotes the block back to StorageTier::Hot if it is currently in a colder tier.

pub fn plan_migrations(&self, now_secs: u64) -> Vec<MigrationTask>

Compute a set of migration tasks based on current idle times and the active policy.

Only tasks where the target tier differs from the current tier are emitted. Small blocks (below policy.min_size_for_cold) are never moved to Cold or Archive.

pub fn apply_migration(&mut self, task: &MigrationTask)

Apply a previously planned migration task, updating the stored tier.

If the block referenced by the task is not found, this is a no-op.

pub fn stats(&self) -> MigratorStats

Compute aggregate statistics over all tracked blocks.