| // 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 |
| } |