github.com/alibaba/sealer@v0.8.6-0.20220430115802-37a2bdaa8173/pkg/plugin/factory.go (about)

     1  // Copyright © 2021 Alibaba Group Holding Ltd.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package plugin
    16  
    17  import "fmt"
    18  
    19  var pluginFactories = make(map[string]Interface)
    20  
    21  func Register(name string, factory Interface) {
    22  	if factory == nil {
    23  		panic("Must not provide nil pluginFactory")
    24  	}
    25  	_, registered := pluginFactories[name]
    26  	if registered {
    27  		panic(fmt.Sprintf("pluginFactory named %s already registered", name))
    28  	}
    29  
    30  	pluginFactories[name] = factory
    31  }