net.corda.core.node.services
Keywords: net.corda.core.node.services package
Date: 2023-09-18

# Package net.corda.core.node.services

- Interface Summary
  Interface | Description
  --- | ---
  AttachmentStorage | An attachment store records potentially large binary objects, identified by their hash.
  ContractUpgradeService | The `interface ContractUpgradeService` is responsible for securely upgrading contract state objects according to a specified and mutually agreed (amongst participants) contract version. See also `class ContractUpgradeFlow` to understand the workflow associated with contract upgrades.
  IdentityService | An identity service maintains a directory of parties by their associated distinguished name/public keys and thus supports lookup of a party given its key, or name. The service also manages the certificates linking confidential identities back to the well known identity.
  KeyManagementService | The KMS is responsible for storing and using private keys to sign things. An implementation of this may, for example, call out to a hardware security module that enforces various auditing and frequency-of-use requirements.
  NetworkMapCache | A network map contains lists of nodes on the network along with information about their identity keys, services they provide and host names or IP addresses where they can be connected to. The cache wraps around a map fetched from an authoritative service, and adds easy lookup of the data stored within it. Generally it would be initialised with a specified network map service, which it fetches data from and then subscribes to updates of.
  NetworkMapCacheBase | Subset of `interface NetworkMapCache` that doesn't depend on an `interface IdentityService`.
  NetworkParametersService | Service for retrieving network parameters used for resolving transactions according to parameters that were historically in force in the network.
  ServiceLifecycleObserver | Specifies that given `annotationclass CordaService` is interested to know about important milestones of Corda Node lifecycle and potentially react to them. Subscription can be performed using `net.corda.core.node.AppServiceHub.register` method from a constructor of `annotationclass CordaService`.
  TelemetryService |
  TransactionStorage | Thread-safe storage of transactions.
  VaultService | A `interface VaultService` is responsible for securely and safely persisting the current state of a vault to storage. The vault service vends immutable snapshots of the current vault for working with: if you build a transaction based on a vault that isn't current, be aware that it may end up being invalid if the states that were used have been consumed by someone else first!

- Class Summary
  Class | Description
  --- | ---
  AttachmentStorageKt |
  PartyInfo | Holds information about a `class Party`, which may refer to either a specific node or a service.
  TimeWindowChecker | Deprecated
  Vault<T extends ContractState> | A vault (name may be temporary) wraps a set of states that are useful for us to keep track of, for instance, because we own them. This class represents an immutable, stable state of a vault: it is guaranteed not to change out from underneath you, even though the canonical currently-best-known vault may change as we learn about new transactions from our peers and generate new transactions that consume states ourselves.
  VaultServiceKt |

- Enum Summary
  Enum | Description
  --- | ---
  ServiceLifecycleEvent |

- Exception Summary
  Exception | Description
  --- | ---
  CordaServiceCriticalFailureException | Please see ServiceLifecycleEvent.STATE_MACHINE_STARTED for the purpose of this exception.
  StatesNotAvailableException |
  UnknownAnonymousPartyException |
  VaultQueryException |