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corda/docs/source/api-service-hub.rst
Joel Dudley f0138dfe17 Tutorial refresh for v1.0 and moving of code into separate files. (#1758) 
* Moves code sections in tutorials to code files.

* Removes wallet references.

* Updates repo layout doc.

* Removes remaining cordapp-tutorial references, replaced with cordapp-example.

* Fixes broken link.

* Misc docs fixes.

* Refreshes the ServiceHub and rpc ops api pages.

* Updates the cheat sheet.

* Updates cookbooks.

* Refreshes the running-a-notary tutorial.

* Updates flow-testing tutorial

* Updates tear-offs tutorial.

* Refreshes integration-testing tutorial.

* Updates to contract tutorial and accompanying code to bring inline with V1 release.

* Refreshes contract-upgrade tutorial.

* Fixed broken code sample in "writing a contract" and updated contracts dsl.

* Added contract ref to java code. Fixed broken rst markup.

* Updates transaction-building tutorial.

* Updates the client-rpc and flow-state-machines tutorials.

* Updates the oracles tutorial.

* Amended country in X500 names from "UK" to "GB"

* Update FlowCookbook.kt

* Amended cheatsheet. Minor update on contract upgrades tutoraial.

* Added `extraCordappPackagesToScan` to node driver.

* Changes to match new function signature.

* Update to reflect change in location of cash contract name.
2017-10-02 10:11:33 +01:00

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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.attachments
    • Gives you access to the node's attachments
  • ServiceHub.validatedTransactions
    • Gives you access to the transactions stored in the node
  • ServiceHub.vaultService
    • Stores the node’s current and historic states
  • 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