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aggregate_registry.go
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/
aggregate_registry.go
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// Copyright 2022 Monoskope Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package eventsourcing
import (
"sync"
"github.com/finleap-connect/monoskope/pkg/eventsourcing/errors"
"github.com/finleap-connect/monoskope/pkg/logger"
)
type AggregateRegistry interface {
RegisterAggregate(func() Aggregate)
CreateAggregate(AggregateType) (Aggregate, error)
}
type aggregateRegistry struct {
log logger.Logger
mutex sync.RWMutex
aggregates map[AggregateType]func() Aggregate
}
var DefaultAggregateRegistry AggregateRegistry
func init() {
DefaultAggregateRegistry = NewAggregateRegistry()
}
// NewAggregateRegistry creates a new aggregate registry
func NewAggregateRegistry() AggregateRegistry {
return &aggregateRegistry{
log: logger.WithName("aggregate-registry"),
aggregates: make(map[AggregateType]func() Aggregate),
}
}
// RegisterAggregate registers an aggregate factory for a type. The factory is
// used to create concrete aggregate types.
//
// An example would be:
//
// RegisterAggregate(func() Aggregate { return &MyAggregate{} })
func (r *aggregateRegistry) RegisterAggregate(factory func() Aggregate) {
aggregate := factory()
if aggregate == nil {
r.log.Info("factory does not create aggregates")
panic(errors.ErrFactoryInvalid)
}
aggregateType := aggregate.Type()
if aggregateType.String() == "" {
r.log.Info("attempt to register empty aggregate type")
panic(errors.ErrEmptyAggregateType)
}
r.mutex.Lock()
defer r.mutex.Unlock()
if _, ok := r.aggregates[aggregateType]; ok {
r.log.Info("attempt to register aggregate already registered", "aggregateType", aggregateType)
panic(errors.ErrAggregateTypeAlreadyRegistered)
}
r.aggregates[aggregateType] = factory
r.log.V(logger.DebugLevel).Info("aggregate has been registered.", "aggregateType", aggregateType)
}
// CreateAggregate creates an aggregate of a type with an ID using the factory
// registered with RegisterAggregate.
func (r *aggregateRegistry) CreateAggregate(aggregateType AggregateType) (Aggregate, error) {
r.mutex.RLock()
defer r.mutex.RUnlock()
if factory, ok := r.aggregates[aggregateType]; ok {
return factory(), nil
}
r.log.Info("trying to create a aggregate of non-registered type", "aggregateType", aggregateType)
return nil, errors.ErrAggregateNotRegistered
}