github.com/tickoalcantara12/micro/v3@v3.0.0-20221007104245-9d75b9bcbab9/util/selector/roundrobin/roundrobin.go (about)

     1  // Licensed under the Apache License, Version 2.0 (the "License");
     2  // you may not use this file except in compliance with the License.
     3  // You may obtain a copy of the License at
     4  //
     5  //     https://www.apache.org/licenses/LICENSE-2.0
     6  //
     7  // Unless required by applicable law or agreed to in writing, software
     8  // distributed under the License is distributed on an "AS IS" BASIS,
     9  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    10  // See the License for the specific language governing permissions and
    11  // limitations under the License.
    12  //
    13  // Original source: github.com/micro/go-micro/v3/selector/roundrobin/roundrobin.go
    14  
    15  package roundrobin
    16  
    17  import (
    18  	"github.com/tickoalcantara12/micro/v3/util/selector"
    19  )
    20  
    21  // NewSelector returns an initalised round robin selector
    22  func NewSelector(opts ...selector.Option) selector.Selector {
    23  	return new(roundrobin)
    24  }
    25  
    26  type roundrobin struct{}
    27  
    28  func (r *roundrobin) Select(routes []string, opts ...selector.SelectOption) (selector.Next, error) {
    29  	if len(routes) == 0 {
    30  		return nil, selector.ErrNoneAvailable
    31  	}
    32  
    33  	i := 0
    34  
    35  	return func() string {
    36  		route := routes[i%len(routes)]
    37  		// increment
    38  		i++
    39  		return route
    40  	}, nil
    41  }
    42  
    43  func (r *roundrobin) Record(addr string, err error) error { return nil }
    44  
    45  func (r *roundrobin) Reset() error { return nil }
    46  
    47  func (r *roundrobin) String() string {
    48  	return "roundrobin"
    49  }