EventSource

An event source is an append-only store of data. Data is represented as a series of events that when replayed in order provides a view of the data at that point in time.

In this implementation, an event is represented by a Transform that is contained within an event (strictly speaking a Event could contain a series of Transforms, but we're not doing that here to keep things simple).

To implement an event source, one needs to:

Extend the EventSource trait. An event source provides data of type V for a given key of type K
Provide an API implementation that creates a suitable Transform for a new value to be saved when given an existing view of the data.
Provide Events implementation that wraps persistence of events (e.g. DynamoDB, in-memory map, Cassandra). Persistence stores only need to support the following key-value operations:
- Records are keyed against a hash key (typically a unique identifier of business value) and a numeric range key
- querying for a given hash key
- conditional saves against a given hash and range key to prevent overwriting of a given record.

TODO - make EventSource sit on top of EventStream

Linear Supertypes

AnyRef, Any

Type Members

sealed trait Error extends AnyRef

EventSource.Error represents any error conditions that are useful to represent for event sources.
EventSource.Error represents any error conditions that are useful to represent for event sources. In particular, we need to know about attempts to store duplicate events.
sealed trait Result[A] extends AnyRef

Value Members

final def !=(arg0: Any): Boolean

Definition Classes
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final def ##(): Int

Definition Classes
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final def ==(arg0: Any): Boolean

Definition Classes
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object Error
object Result
final def asInstanceOf[T0]: T0

Definition Classes
Any
def clone(): AnyRef

Attributes
protected[java.lang]
Definition Classes
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Annotations
@throws( ... )
final def eq(arg0: AnyRef): Boolean

Definition Classes
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def equals(arg0: Any): Boolean

Definition Classes
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def finalize(): Unit

Attributes
protected[java.lang]
Definition Classes
AnyRef
Annotations
@throws( classOf[java.lang.Throwable] )
final def getClass(): Class[_]

Definition Classes
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def hashCode(): Int

Definition Classes
AnyRef → Any
final def isInstanceOf[T0]: Boolean

Definition Classes
Any
final def ne(arg0: AnyRef): Boolean

Definition Classes
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final def notify(): Unit

Definition Classes
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final def notifyAll(): Unit

Definition Classes
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final def synchronized[T0](arg0: ⇒ T0): T0

Definition Classes
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def toString(): String

Definition Classes
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final def wait(): Unit

Definition Classes
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Annotations
@throws( ... )
final def wait(arg0: Long, arg1: Int): Unit

Definition Classes
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Annotations
@throws( ... )
final def wait(arg0: Long): Unit

Definition Classes
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Annotations
@throws( ... )

Related Docs: trait EventSource | package source

object EventSource

Type Members

sealed trait Error extends AnyRef

sealed trait Result[A] extends AnyRef

Value Members

final def !=(arg0: Any): Boolean

final def ##(): Int

final def ==(arg0: Any): Boolean

object Error

object Result

final def asInstanceOf[T0]: T0

def clone(): AnyRef

final def eq(arg0: AnyRef): Boolean

def equals(arg0: Any): Boolean

def finalize(): Unit

final def getClass(): Class[_]

def hashCode(): Int

final def isInstanceOf[T0]: Boolean

final def ne(arg0: AnyRef): Boolean

final def notify(): Unit

final def notifyAll(): Unit

final def synchronized[T0](arg0: ⇒ T0): T0

def toString(): String

final def wait(): Unit

final def wait(arg0: Long, arg1: Int): Unit

final def wait(arg0: Long): Unit

Inherited from AnyRef

Inherited from Any

Ungrouped