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factory.go
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factory.go
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// Copyright (c) 2018 The Jaeger 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 strategystore
import (
"flag"
"fmt"
"github.com/spf13/viper"
"github.com/uber/jaeger-lib/metrics"
"go.uber.org/zap"
"github.com/jaegertracing/jaeger/cmd/collector/app/sampling/strategystore"
"github.com/jaegertracing/jaeger/plugin"
"github.com/jaegertracing/jaeger/plugin/sampling/strategystore/static"
)
const (
staticStrategyStoreType = "static"
adaptiveStrategyStoreType = "adaptive"
)
var allSamplingTypes = []string{staticStrategyStoreType} // TODO support adaptive
// Factory implements strategystore.Factory interface as a meta-factory for strategy storage components.
type Factory struct {
FactoryConfig
factories map[string]strategystore.Factory
}
// NewFactory creates the meta-factory.
func NewFactory(config FactoryConfig) (*Factory, error) {
f := &Factory{FactoryConfig: config}
uniqueTypes := map[string]struct{}{
f.StrategyStoreType: {},
}
f.factories = make(map[string]strategystore.Factory)
for t := range uniqueTypes {
ff, err := f.getFactoryOfType(t)
if err != nil {
return nil, err
}
f.factories[t] = ff
}
return f, nil
}
func (f *Factory) getFactoryOfType(factoryType string) (strategystore.Factory, error) {
switch factoryType {
case staticStrategyStoreType:
return static.NewFactory(), nil
default:
return nil, fmt.Errorf("Unknown sampling strategy store type %s. Valid types are %v", factoryType, allSamplingTypes)
}
}
// AddFlags implements plugin.Configurable
func (f *Factory) AddFlags(flagSet *flag.FlagSet) {
for _, factory := range f.factories {
if conf, ok := factory.(plugin.Configurable); ok {
conf.AddFlags(flagSet)
}
}
}
// InitFromViper implements plugin.Configurable
func (f *Factory) InitFromViper(v *viper.Viper) {
for _, factory := range f.factories {
if conf, ok := factory.(plugin.Configurable); ok {
conf.InitFromViper(v)
}
}
}
// Initialize implements strategystore.Factory
func (f *Factory) Initialize(metricsFactory metrics.Factory, logger *zap.Logger) error {
for _, factory := range f.factories {
if err := factory.Initialize(metricsFactory, logger); err != nil {
return err
}
}
return nil
}
// CreateStrategyStore implements strategystore.Factory
func (f *Factory) CreateStrategyStore() (strategystore.StrategyStore, error) {
factory, ok := f.factories[f.StrategyStoreType]
if !ok {
return nil, fmt.Errorf("No %s strategy store registered", f.StrategyStoreType)
}
return factory.CreateStrategyStore()
}