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corda/docs/source/api-service-hub.rst

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API: ServiceHub

Within FlowLogic.call, the flow developer has access to the node's ServiceHub, which provides access to the various services the node provides. The services offered by the ServiceHub are split into the following categories:

  • ServiceHub.networkMapCache
    • Provides information on other nodes on the network (e.g. notaries…)
  • ServiceHub.identityService
    • Allows you to resolve anonymous identities to well-known identities if you have the required certificates
  • ServiceHub.vaultService
    • Stores the node’s current and historic states
  • ServiceHub.storageService
    • Stores additional information such as transactions and attachments
  • ServiceHub.keyManagementService
    • Manages signing transactions and generating fresh public keys
  • ServiceHub.myInfo
    • Other information about the node
  • ServiceHub.clock
    • Provides access to the node’s internal time and date

Additional, ServiceHub exposes the following properties:

  • ServiceHub.loadState and ServiceHub.toStateAndRef to resolve a StateRef into a TransactionState or a StateAndRef
  • ServiceHub.signInitialTransaction to sign a TransactionBuilder and convert it into a SignedTransaction
  • ServiceHub.createSignature and ServiceHub.addSignature to create and add signatures to a SignedTransaction

Finally, ServiceHub exposes the node's legal identity key (via ServiceHub.legalIdentityKey) and its notary identity key (via ServiceHub.notaryIdentityKey).