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Extends cqrs about goroutine pool go (#18)
* extends cqrs about goroutine pool go function * implement generic projection for resource/device * generalize name of args in mock eventstore * fix after codereview
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,98 @@ | ||
| package projection | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
|
|
||
| "github.com/go-ocf/cqrs" | ||
| "github.com/go-ocf/cqrs/eventbus" | ||
| "github.com/go-ocf/cqrs/eventstore" | ||
| "github.com/go-ocf/kit/log" | ||
| ) | ||
|
|
||
| type Projection struct { | ||
| cqrsProjection *cqrs.Projection | ||
|
|
||
| topicManager *TopicManager | ||
| refCountMap *RefCountMap | ||
| } | ||
|
|
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| func NewProjection(ctx context.Context, name string, store eventstore.EventStore, subscriber eventbus.Subscriber, factoryModel eventstore.FactoryModelFunc, getTopics GetTopicsFunc) (*Projection, error) { | ||
| cqrsProjection, err := cqrs.NewProjection(ctx, store, name, subscriber, factoryModel, log.Debugf) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("cannot create Projection: %v", err) | ||
| } | ||
| return &Projection{ | ||
| cqrsProjection: cqrsProjection, | ||
| topicManager: NewTopicManager(getTopics), | ||
| refCountMap: NewRefCountMap(), | ||
| }, nil | ||
| } | ||
|
|
||
| func (p *Projection) ForceUpdate(ctx context.Context, registrationId string, query []eventstore.SnapshotQuery) error { | ||
| _, err := p.refCountMap.Inc(registrationId, false) | ||
| if err != nil { | ||
| return fmt.Errorf("cannot force update projection: %v", err) | ||
| } | ||
|
|
||
| err = p.cqrsProjection.Project(ctx, query) | ||
| if err != nil { | ||
| return fmt.Errorf("cannot force update projection: %v", err) | ||
| } | ||
| _, err = p.refCountMap.Dec(registrationId) | ||
| if err != nil { | ||
| return fmt.Errorf("cannot force update projection: %v", err) | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func (p *Projection) Models(query []eventstore.SnapshotQuery) []eventstore.Model { | ||
| return p.cqrsProjection.Models(query) | ||
| } | ||
|
|
||
| func (p *Projection) Register(ctx context.Context, registrationId string, query []eventstore.SnapshotQuery) (loaded bool, err error) { | ||
| created, err := p.refCountMap.Inc(registrationId, true) | ||
| if err != nil { | ||
| return false, fmt.Errorf("cannot register device: %v", err) | ||
| } | ||
| if !created { | ||
| return false, nil | ||
| } | ||
|
|
||
| err = p.cqrsProjection.Project(ctx, query) | ||
| if err != nil { | ||
| return false, fmt.Errorf("cannot register device: %v", err) | ||
| } | ||
|
|
||
| topics, updateSubscriber := p.topicManager.Add(registrationId) | ||
|
|
||
| if updateSubscriber { | ||
| err := p.cqrsProjection.SubscribeTo(topics) | ||
| if err != nil { | ||
| p.refCountMap.Dec(registrationId) | ||
| return false, fmt.Errorf("cannot register device: %v", err) | ||
| } | ||
| } | ||
| return true, nil | ||
| } | ||
|
|
||
| func (p *Projection) Unregister(registrationId string) error { | ||
| deleted, err := p.refCountMap.Dec(registrationId) | ||
| if err != nil { | ||
| return fmt.Errorf("cannot unregister device from projection: %v", err) | ||
| } | ||
| if !deleted { | ||
| return nil | ||
| } | ||
|
|
||
| topics, updateSubscriber := p.topicManager.Remove(registrationId) | ||
|
|
||
| if updateSubscriber { | ||
| err := p.cqrsProjection.SubscribeTo(topics) | ||
| if err != nil { | ||
| log.Errorf("cannot change topics for projection: %v", err) | ||
| } | ||
| } | ||
|
|
||
| return nil | ||
| } |
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