github.com/1aal/kubeblocks@v0.0.0-20231107070852-e1c03e598921/pkg/controller/model/parallel_transformer.go (about)

     1  /*
     2  Copyright (C) 2022-2023 ApeCloud Co., Ltd
     3  
     4  This file is part of KubeBlocks project
     5  
     6  This program is free software: you can redistribute it and/or modify
     7  it under the terms of the GNU Affero General Public License as published by
     8  the Free Software Foundation, either version 3 of the License, or
     9  (at your option) any later version.
    10  
    11  This program is distributed in the hope that it will be useful
    12  but WITHOUT ANY WARRANTY; without even the implied warranty of
    13  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    14  GNU Affero General Public License for more details.
    15  
    16  You should have received a copy of the GNU Affero General Public License
    17  along with this program.  If not, see <http://www.gnu.org/licenses/>.
    18  */
    19  
    20  package model
    21  
    22  import (
    23  	"fmt"
    24  	"sync"
    25  
    26  	"github.com/1aal/kubeblocks/pkg/controller/graph"
    27  )
    28  
    29  // ParallelTransformer executes a group of transformers in parallel.
    30  // TODO: make DAG thread-safe if ParallelTransformer called.
    31  type ParallelTransformer struct {
    32  	Transformers []graph.Transformer
    33  }
    34  
    35  func (t *ParallelTransformer) Transform(ctx graph.TransformContext, dag *graph.DAG) error {
    36  	var group sync.WaitGroup
    37  	var errs error
    38  	for _, transformer := range t.Transformers {
    39  		transformer := transformer
    40  		group.Add(1)
    41  		go func() {
    42  			err := transformer.Transform(ctx, dag)
    43  			if err != nil {
    44  				// TODO: sync.Mutex errs
    45  				errs = fmt.Errorf("%v; %v", errs, err)
    46  			}
    47  			group.Done()
    48  		}()
    49  	}
    50  	group.Wait()
    51  	return errs
    52  }
    53  
    54  var _ graph.Transformer = &ParallelTransformer{}