Packages

package root

Definition Classes: root

package com

Definition Classes: root

package digitalasset

Definition Classes: com

package canton

Definition Classes: digitalasset

package ledger

Definition Classes: canton

package participant

Definition Classes: ledger

package state

Definition Classes: participant

package v2

Interfaces to read from and write to an (abstract) participant state.

A Daml ledger participant is code that allows to actively participate in the evolution of a shared Daml ledger. Each such participant maintains a particular view onto the state of the Daml ledger. We call this view the participant state.

Actual implementations of a Daml ledger participant will likely maintain more state than what is exposed through the interfaces in this package, which is why we talk about an abstract participant state. It abstracts over the different implementations of Daml ledger participants.

The interfaces are optimized for easy implementation. The v2.WriteService interface contains the methods for changing the participant state (and potentially the state of the Daml ledger), which all ledger participants must support. These methods are for example exposed via the Daml Ledger API. Actual ledger participant implementations likely support more implementation-specific methods. They are however not exposed via the Daml Ledger API. The v2.ReadService interface contains the one method v2.ReadService.stateUpdates to read the state of a ledger participant. It represents the participant state as a stream of v2.Updates to an initial participant state. The typical consumer of this method is a class that subscribes to this stream of v2.Updates and reconstructs (a view of) the actual participant state. See the comments on v2.Update and v2.ReadService.stateUpdates for details about the kind of updates and the guarantees given to consumers of the stream of v2.Updates.

We do expect the interfaces provided in com.digitalasset.canton.ledger.participant.state to evolve, which is why we provide them all in the com.digitalasset.canton.ledger.participant.state.v2 package. Where possible we will evolve them in a backwards compatible fashion, so that a simple recompile suffices to upgrade to a new version. Where that is not possible, we plan to introduce new version of this API in a separate package and maintain it side-by-side with the existing version if possible. There can therefore potentially be multiple versions of participant state APIs at the same time. We plan to deprecate and drop old versions on separate and appropriate timelines.

Definition Classes: state

package metrics

Definition Classes: v2

WriteParticipantPruningService

WritePartyService

WriteService

com.digitalasset.canton.ledger.participant.state.v2

ChangeId

final case class ChangeId(applicationId: daml.lf.data.Ref.ApplicationId, commandId: daml.lf.data.Ref.CommandId, actAs: Set[Party]) extends Product with Serializable

Identifier for ledger changes used by command deduplication. Equality is defined in terms of the cryptographic hash.

See also: ReadService.stateUpdates for the command deduplication guarantee

Linear Supertypes

Serializable, Product, Equals, AnyRef, Any

Ordering

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Inherited

ChangeId
Serializable
Product
Equals
AnyRef
Any

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Visibility

Public
Protected

Instance Constructors

new ChangeId(applicationId: daml.lf.data.Ref.ApplicationId, commandId: daml.lf.data.Ref.CommandId, actAs: Set[Party])

Value Members

final def !=(arg0: Any): Boolean
Definition Classes
AnyRef → Any
final def ##: Int
Definition Classes
AnyRef → Any
final def ==(arg0: Any): Boolean
Definition Classes
AnyRef → Any
val actAs: Set[Party]
val applicationId: daml.lf.data.Ref.ApplicationId
final def asInstanceOf[T0]: T0
Definition Classes
Any
def clone(): AnyRef
Attributes
protected[lang]
Definition Classes
AnyRef
Annotations
@throws(classOf[java.lang.CloneNotSupportedException]) @native() @IntrinsicCandidate()
val commandId: daml.lf.data.Ref.CommandId
final def eq(arg0: AnyRef): Boolean
Definition Classes
AnyRef
def equals(that: Any): Boolean
Definition Classes
ChangeId → Equals → AnyRef → Any
final def getClass(): Class[_ <: AnyRef]
Definition Classes
AnyRef → Any
Annotations
@native() @IntrinsicCandidate()
lazy val hash: Hash
A stable hash of the change id.
A stable hash of the change id. Suitable for storing in persistent storage.
def hashCode(): Int
Definition Classes
ChangeId → AnyRef → Any
final def isInstanceOf[T0]: Boolean
Definition Classes
Any
final def ne(arg0: AnyRef): Boolean
Definition Classes
AnyRef
final def notify(): Unit
Definition Classes
AnyRef
Annotations
@native() @IntrinsicCandidate()
final def notifyAll(): Unit
Definition Classes
AnyRef
Annotations
@native() @IntrinsicCandidate()
def productElementNames: Iterator[String]
Definition Classes
Product
final def synchronized[T0](arg0: => T0): T0
Definition Classes
AnyRef
final def wait(arg0: Long, arg1: Int): Unit
Definition Classes
AnyRef
Annotations
@throws(classOf[java.lang.InterruptedException])
final def wait(arg0: Long): Unit
Definition Classes
AnyRef
Annotations
@throws(classOf[java.lang.InterruptedException]) @native()
final def wait(): Unit
Definition Classes
AnyRef
Annotations
@throws(classOf[java.lang.InterruptedException])

Deprecated Value Members

def finalize(): Unit
Attributes
protected[lang]
Definition Classes
AnyRef
Annotations
@throws(classOf[java.lang.Throwable]) @Deprecated @Deprecated
Deprecated

Packages

ChangeId

final case class ChangeId(applicationId: daml.lf.data.Ref.ApplicationId, commandId: daml.lf.data.Ref.CommandId, actAs: Set[Party]) extends Product with Serializable

Instance Constructors

Value Members

Deprecated Value Members

Inherited from Serializable

Inherited from Product

Inherited from Equals

Inherited from AnyRef

Inherited from Any

Ungrouped

Packages

ChangeId

final case class ChangeId(applicationId: daml.lf.data.Ref.ApplicationId, commandId: daml.lf.data.Ref.CommandId, actAs: Set[Party]) extends Product with Serializable

Instance Constructors

Value Members

Deprecated Value Members

Inherited from Serializable

Inherited from Product

Inherited from Equals

Inherited from AnyRef

Inherited from Any

Ungrouped

ChangeId