Package com.exonum.binding.core.storage.indices

Interface HashableIndex

All Superinterfaces:
StorageIndex
All Known Subinterfaces:
ProofEntryIndex<T>
All Known Implementing Classes:
ProofEntryIndexProxy, ProofListIndexProxy, ProofMapIndexProxy
public interface HashableIndex
extends StorageIndex
A hashable index provides a cryptographic hash which represents the complete state of this index.

Hashable indexes enable efficient verification of their contents. Two indexes contain the same values if their index hashes are equal. This property is used in the consensus algorithm to compare the database state on different nodes.

Index hashes are also used in verifiable index views. Such views contain a subset of index elements and a proof that jointly allow to restore the index hash. The computed index hash allows to verify that the elements come from an index with a certain state.

Hashable indexes may participate in state hash aggregation.

See Also:
ObjectHash trait

  • Method Summary

    Modifier and Type Method Description
    HashCode getIndexHash()
    Returns the index hash which represents the complete state of this index.

    Methods inherited from interface com.exonum.binding.core.storage.indices.StorageIndex

    getAddress, getName

  • Method Details

    • getIndexHash

      HashCode getIndexHash()
      Returns the index hash which represents the complete state of this index. Any modifications to the stored entries affect the index hash.

      How index hash is computed depends on the index data structure implementation.