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factory.go
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factory.go
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// Copyright Istio 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 cluster
import (
"fmt"
)
type Factory interface {
Kind() Kind
With(config ...Config) Factory
Build() (Clusters, error)
}
// FactoryFunc validates a config and builds a single echo instance.
type FactoryFunc func(cfg Config, topology Topology) (Cluster, error)
var factoryRegistry = map[Kind]FactoryFunc{}
// RegisterFactory globally registers a base factory of a given Kind.
// The given factory should be immutable, as it will be used globally.
func RegisterFactory(kind Kind, factory FactoryFunc) {
factoryRegistry[kind] = factory
}
func GetFactory(config Config) (FactoryFunc, error) {
f, ok := factoryRegistry[config.Kind]
if !ok {
return nil, fmt.Errorf("unsupported cluster kind %s", config.Kind)
}
return f, nil
}