dubbo.apache.org/dubbo-go/v3@v3.1.1/common/extension/service_instance_selector_factory.go (about)

     1  /*
     2   * Licensed to the Apache Software Foundation (ASF) under one or more
     3   * contributor license agreements.  See the NOTICE file distributed with
     4   * this work for additional information regarding copyright ownership.
     5   * The ASF licenses this file to You under the Apache License, Version 2.0
     6   * (the "License"); you may not use this file except in compliance with
     7   * the License.  You may obtain a copy of the License at
     8   *
     9   *     http://www.apache.org/licenses/LICENSE-2.0
    10   *
    11   * Unless required by applicable law or agreed to in writing, software
    12   * distributed under the License is distributed on an "AS IS" BASIS,
    13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    14   * See the License for the specific language governing permissions and
    15   * limitations under the License.
    16   */
    17  
    18  package extension
    19  
    20  import (
    21  	perrors "github.com/pkg/errors"
    22  )
    23  
    24  import (
    25  	"dubbo.apache.org/dubbo-go/v3/registry/servicediscovery/instance"
    26  )
    27  
    28  var serviceInstanceSelectorMappings = make(map[string]func() instance.ServiceInstanceSelector, 2)
    29  
    30  // nolint
    31  func SetServiceInstanceSelector(name string, f func() instance.ServiceInstanceSelector) {
    32  	serviceInstanceSelectorMappings[name] = f
    33  }
    34  
    35  // GetServiceInstanceSelector will create an instance
    36  // it will panic if selector with the @name not found
    37  func GetServiceInstanceSelector(name string) (instance.ServiceInstanceSelector, error) {
    38  	serviceInstanceSelector, ok := serviceInstanceSelectorMappings[name]
    39  	if !ok {
    40  		return nil, perrors.New("Could not find service instance selector with" +
    41  			"name:" + name)
    42  	}
    43  	return serviceInstanceSelector(), nil
    44  }