github.com/vescale/zgraph@v0.0.0-20230410094002-959c02d50f95/stmtctx/id_range_test.go (about)

     1  // Copyright 2022 zGraph Authors. All rights reserved.
     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 stmtctx
    16  
    17  import (
    18  	"sync/atomic"
    19  	"testing"
    20  
    21  	"github.com/sourcegraph/conc"
    22  	"github.com/stretchr/testify/assert"
    23  )
    24  
    25  func TestIDRange_Next(t *testing.T) {
    26  	rang := NewIDRange(0, 3)
    27  
    28  	assert := assert.New(t)
    29  
    30  	for i := 0; i < 3; i++ {
    31  		id, err := rang.Next()
    32  		assert.Nil(err)
    33  		assert.Equal(int64(i+1), id)
    34  	}
    35  
    36  	_, err := rang.Next()
    37  	assert.NotNil(err)
    38  }
    39  
    40  func TestIDRange_NextParallel(t *testing.T) {
    41  	const n = 10000000
    42  	rang := NewIDRange(0, n)
    43  
    44  	const p = 20
    45  
    46  	wg := conc.WaitGroup{}
    47  	total := atomic.Int64{}
    48  	for i := 0; i < p; i++ {
    49  		wg.Go(func() {
    50  			var subn int64
    51  			for {
    52  				_, err := rang.Next()
    53  				if err != nil {
    54  					total.Add(subn)
    55  					return
    56  				}
    57  				subn++
    58  			}
    59  		})
    60  	}
    61  
    62  	wg.Wait()
    63  	assert.Equal(t, total.Load(), int64(n))
    64  }