eventsource

package
v1.4.1 Latest Latest
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 Go to latest Published: Feb 19, 2020 License: MIT Imports: 8 Imported by: 6

Documentation

Index

Constants

This section is empty.

Variables

View Source 
var (
	// ErrDeleted is returned by Aggregate.On() method to signal that the object has been deleted
	ErrDeleted = errors.New("not found (was deleted)")
	// ErrNoHistory is returned by Repository.Load() when no history exist for the given aggregate ID
	ErrNoHistory = errors.New("no history found")
)

Functions

func GetType added in v1.3.2 

func GetType(e Event) reflect.Type

GetType the type of the given input value, or if input is a pointer, return the type of the pointed to object

func GetTypeName added in v1.3.2 

func GetTypeName(e Event) string

GetTypeName the type of the given input value, or if input is a pointer, return the type of the pointed to object

func NewULID added in v1.1.1 

func NewULID() string

NewULID returns a Universally Unique Lexicographically Sortable Identifier

Types

type Aggregate 

type Aggregate interface {
	On(ctx context.Context, event Event) error
	SetAggregateID(id string)
}

Aggregate is an interface representing an object whose state changes can be recorded to and replayed from an event source.

type AggregatorMock 

type AggregatorMock struct {
	Mock *mock.Mock
}

AggregatorMock is a mock

func CreateAggregatorMock 

func CreateAggregatorMock() *AggregatorMock

CreateAggregatorMock returns a aggregatorMock

func (AggregatorMock) On 

func (o AggregatorMock) On(ctx context.Context, event Event) error

On is a mock

func (AggregatorMock) SetAggregateID 

func (o AggregatorMock) SetAggregateID(id string)

SetAggregateID is not implemented

type BaseEvent 

type BaseEvent struct {
	AggregateID string `json:"aggregateId"`
	UserID      string `json:"userId"`
	SequenceID  string `json:"sequenceId"`
	Timestamp   int64  `json:"timestamp"`
}

BaseEvent ...

func (BaseEvent) GetAggregateID 

func (e BaseEvent) GetAggregateID() string

GetAggregateID ...

func (BaseEvent) GetSequenceID added in v1.3.0 

func (e BaseEvent) GetSequenceID() string

GetSequenceID ...

func (BaseEvent) GetTimestamp added in v1.3.0 

func (e BaseEvent) GetTimestamp() int64

GetTimestamp ...

func (BaseEvent) GetUserID 

func (e BaseEvent) GetUserID() string

GetUserID ...

func (*BaseEvent) SetSequenceID added in v1.3.0 

func (e *BaseEvent) SetSequenceID(sequenceID string)

SetSequenceID ...

func (*BaseEvent) SetTimestamp added in v1.3.0 

func (e *BaseEvent) SetTimestamp(timestamp int64)

SetTimestamp ...

type Event 

type Event interface {
	GetAggregateID() string
	GetUserID() string
	GetSequenceID() string
	GetTimestamp() int64
	SetSequenceID(string)
	SetTimestamp(int64)
}

Event ...

type NotificationService added in v1.4.0 

type NotificationService interface {
	SendNotification(record Record) error
}

NotificationService represents a service which can emit notifications when records are saved to the event source

type NotificationServiceMock added in v1.4.0 

type NotificationServiceMock struct {
	*mock.Mock
}

func CreateNotificationServiceMock added in v1.4.0 

func CreateNotificationServiceMock() *NotificationServiceMock

CreateNotificationServiceMock creates a notification service mock

func (NotificationServiceMock) SendNotification added in v1.4.0 

func (ns NotificationServiceMock) SendNotification(record Record) error

type Record 

type Record struct {
	AggregateID string `json:"aggregateId"`
	SequenceID  string `json:"sequenceId"`
	Timestamp   int64  `json:"timestamp"`
	Type        string `json:"type"`
	Data        []byte `json:"data"`
	UserID      string `json:"userId"`
}

Record is a store row. The Data field contains the marshalled Event, and Type is the type of event retrieved by reflect.TypeOf(event).

type Repository 

type Repository interface {
	// Save one or more events to the repository
	Save(ctx context.Context, events ...Event) error

	// Save one or more events to the repository, within a transaction
	SaveTransaction(ctx context.Context, events ...Event) (StoreTransaction, error)

	// Load events from repository for the given aggregate ID. For each event e,
	// call aggr.On(e) to update the state of aggr. When done, aggr has been
	// "fast forwarded" to the current state.
	Load(ctx context.Context, id string, aggr Aggregate) (deleted bool, err error)

	// Get all events with sequence ID newer than the given ID (see https://github.com/oklog/ulid)
	// Return at most limit records. If limit is 0, don't limit the number of records returned.
	GetEventsBySequenceID(ctx context.Context, sequenceID string, limit int) (events []Event, err error)

	// Same as GetEventsBySequenceID, but only returns events of the same type
	// as the one provided in the eventType parameter.
	GetEventsBySequenceIDAndType(ctx context.Context, sequenceID string, eventType Event, limit int) (events []Event, err error)

	// Get all events newer than the given timestamp
	// Return at most limit records. If limit is 0, don't limit the number of records returned.
	GetEventsByTimestamp(ctx context.Context, timestamp int64, limit int) (events []Event, err error)

	// Set notification service
	SetNotificationService(notificationService NotificationService)
}

Repository is an interface representing the actual event source.

func NewRepository 

func NewRepository(store Store, serializer Serializer) Repository

NewRepository returns a new repository

type RepositoryMock 

type RepositoryMock struct {
	*mock.Mock
}

RepositoryMock is a mock

func CreateRepositoryMock 

func CreateRepositoryMock() *RepositoryMock

CreateRepositoryMock returns a repositoryMock

func (RepositoryMock) GetEventsBySequenceID added in v1.3.0 

func (r RepositoryMock) GetEventsBySequenceID(ctx context.Context, sequenceID string, limit int) ([]Event, error)

GetEventsBySequenceID is a mock

func (RepositoryMock) GetEventsBySequenceIDAndType added in v1.3.2 

func (r RepositoryMock) GetEventsBySequenceIDAndType(ctx context.Context, sequenceID string, eventType Event, limit int) ([]Event, error)

GetEventsBySequenceIDAndType is a mock

func (RepositoryMock) GetEventsByTimestamp added in v1.3.0 

func (r RepositoryMock) GetEventsByTimestamp(ctx context.Context, timestamp int64, limit int) ([]Event, error)

GetEventsByTimestamp is a mock

func (RepositoryMock) Load 

func (r RepositoryMock) Load(ctx context.Context, id string, aggr Aggregate) (deleted bool, err error)

Load is a mock

func (RepositoryMock) Save 

func (r RepositoryMock) Save(ctx context.Context, events ...Event) error

Save is a mock

func (RepositoryMock) SaveTransaction added in v1.2.0 

func (r RepositoryMock) SaveTransaction(ctx context.Context, events ...Event) (StoreTransaction, error)

SaveTransaction is a mock

func (RepositoryMock) SetNotificationService added in v1.4.0 

func (r RepositoryMock) SetNotificationService(ns NotificationService)

SetNotificationService is a mock

type Serializer 

type Serializer interface {
	Unmarshal(data []byte, eventType string) (event Event, err error)
	Marshal(event Event) (data []byte, err error)
}

Serializer is an interface that should be implemented if events need to be saved using a new storage format.

type SerializerMock 

type SerializerMock struct {
	*mock.Mock
}

SerializerMock is a mock

func CreateSerializerMock 

func CreateSerializerMock() *SerializerMock

CreateSerializerMock returns a serializerMock

func (SerializerMock) Marshal 

func (o SerializerMock) Marshal(event Event) (data []byte, err error)

Marshal returns the JSON encoding of event.

func (SerializerMock) Unmarshal 

func (o SerializerMock) Unmarshal(data []byte, eventType string) (event Event, err error)

Unmarshal parses the JSON-encoded data and returns an event

type Store 

type Store interface {
	NewTransaction(ctx context.Context, records ...Record) (StoreTransaction, error)
	LoadByAggregate(ctx context.Context, aggregateID string) (record []Record, err error)
	LoadBySequenceID(ctx context.Context, sequenceID string, limit int) (record []Record, err error)
	LoadBySequenceIDAndType(ctx context.Context, sequenceID string, eventType string, limit int) (records []Record, err error)
	LoadByTimestamp(ctx context.Context, timestamp int64, limit int) (record []Record, err error)
}

Store is the interface implemented by the data stores that can be used as back end for the event source.

type StoreMock 

type StoreMock struct {
	*mock.Mock
}

StoreMock is a mock

func CreateStoreMock 

func CreateStoreMock() *StoreMock

CreateStoreMock returns a storeMock

func (StoreMock) LoadByAggregate added in v1.3.0 

func (o StoreMock) LoadByAggregate(ctx context.Context, aggregateID string) (record []Record, err error)

LoadByAggregate is a mock

func (StoreMock) LoadBySequenceID added in v1.3.0 

func (o StoreMock) LoadBySequenceID(ctx context.Context, sequenceID string, limit int) (record []Record, err error)

LoadBySequenceID is a mock

func (StoreMock) LoadBySequenceIDAndType added in v1.3.2 

func (o StoreMock) LoadBySequenceIDAndType(ctx context.Context, sequenceID string, eventType string, limit int) (record []Record, err error)

LoadBySequenceIDAndType is a mock

func (StoreMock) LoadByTimestamp added in v1.3.0 

func (o StoreMock) LoadByTimestamp(ctx context.Context, timestamp int64, limit int) (record []Record, err error)

LoadByTimestamp is a mock

func (StoreMock) NewTransaction added in v1.2.0 

func (o StoreMock) NewTransaction(ctx context.Context, records ...Record) (StoreTransaction, error)

NewTransaction is a mock

type StoreTransaction added in v1.2.0 

type StoreTransaction interface {
	Commit() error
	Rollback() error
}

StoreTransaction encapsulates a write operation to a Store, allowing the caller to roll back the operation.

type StoreTransactionMock added in v1.2.0 

type StoreTransactionMock struct {
	*mock.Mock
}

StoreTransactionMock is a mock

func CreateStoreTransactionMock added in v1.2.0 

func CreateStoreTransactionMock() *StoreTransactionMock

CreateStoreTransactionMock returns a store transaction mock

func (StoreTransactionMock) Commit added in v1.2.0 

func (o StoreTransactionMock) Commit() error

Commit is a mock

func (StoreTransactionMock) Rollback added in v1.2.0 

func (o StoreTransactionMock) Rollback() error

Rollback is a mock

Source Files

View all Source files

Directories

Path Synopsis
notification
sns
serializers
json
stores
dynamodbstore
memorystore
sqlstore

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