An attachment store records potentially large binary objects, identified by their hash.
Annotate any class that needs to be a long-lived service within the node, such as an oracle, with this annotation. Such a class needs to have a constructor with a single parameter of type AppServiceHub. This constructor will be invoked during node start to initialise the service. The service hub provided can be used to get information about the node that may be necessary for the service. Corda services are created as singletons within the node and are available to flows via
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.
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.
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.
Thread-safe storage of transactions.
Holds information about a
|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.
Services which run within a Corda node and provide various pieces of functionality such as identity management, transaction storage, etc.