github.com/m3db/m3@v1.5.0/src/x/sync/worker_pool_test.go (about)

     1  // Copyright (c) 2017 Uber Technologies, Inc.
     2  //
     3  // Permission is hereby granted, free of charge, to any person obtaining a copy
     4  // of this software and associated documentation files (the "Software"), to deal
     5  // in the Software without restriction, including without limitation the rights
     6  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     7  // copies of the Software, and to permit persons to whom the Software is
     8  // furnished to do so, subject to the following conditions:
     9  //
    10  // The above copyright notice and this permission notice shall be included in
    11  // all copies or substantial portions of the Software.
    12  //
    13  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    14  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    15  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    16  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    17  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    18  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    19  // THE SOFTWARE.
    20  
    21  package sync
    22  
    23  import (
    24  	stdctx "context"
    25  	"sync"
    26  	"sync/atomic"
    27  	"testing"
    28  	"time"
    29  
    30  	"github.com/stretchr/testify/require"
    31  
    32  	"github.com/m3db/m3/src/x/context"
    33  )
    34  
    35  const testWorkerPoolSize = 5
    36  
    37  func TestGo(t *testing.T) {
    38  	var count uint32
    39  
    40  	p := NewWorkerPool(testWorkerPoolSize)
    41  	p.Init()
    42  
    43  	var wg sync.WaitGroup
    44  	for i := 0; i < testWorkerPoolSize*2; i++ {
    45  		wg.Add(1)
    46  		p.Go(func() {
    47  			atomic.AddUint32(&count, 1)
    48  			wg.Done()
    49  		})
    50  	}
    51  	wg.Wait()
    52  
    53  	require.Equal(t, uint32(testWorkerPoolSize*2), count)
    54  }
    55  
    56  func TestGoIfAvailable(t *testing.T) {
    57  	var count uint32
    58  
    59  	p := NewWorkerPool(testWorkerPoolSize)
    60  	p.Init()
    61  
    62  	start := make(chan struct{})
    63  
    64  	var wg sync.WaitGroup
    65  	for i := 0; i < testWorkerPoolSize; i++ {
    66  		wg.Add(1)
    67  		p.Go(func() {
    68  			<-start
    69  			atomic.AddUint32(&count, 1)
    70  			wg.Done()
    71  		})
    72  	}
    73  
    74  	// Should fail since no workers are available
    75  	require.False(t, p.GoIfAvailable(func() {}))
    76  
    77  	// Release blocked goroutines and wait for completion
    78  	close(start)
    79  	wg.Wait()
    80  
    81  	// Spin up another, should execute since there is a worker available
    82  	wg.Add(1)
    83  	p.GoIfAvailable(func() {
    84  		atomic.AddUint32(&count, 1)
    85  		wg.Done()
    86  	})
    87  	wg.Wait()
    88  
    89  	require.Equal(t, uint32(testWorkerPoolSize+1), count)
    90  }
    91  
    92  func TestGoWithTimeout(t *testing.T) {
    93  	var count uint32
    94  
    95  	p := NewWorkerPool(testWorkerPoolSize)
    96  	p.Init()
    97  
    98  	start := make(chan struct{})
    99  
   100  	var wg sync.WaitGroup
   101  	for i := 0; i < testWorkerPoolSize; i++ {
   102  		wg.Add(1)
   103  		p.Go(func() {
   104  			<-start
   105  			atomic.AddUint32(&count, 1)
   106  			wg.Done()
   107  		})
   108  	}
   109  
   110  	// Should timeout
   111  	require.False(t, p.GoWithTimeout(func() {}, time.Millisecond*500))
   112  
   113  	// Release blocked goroutines and wait for completion
   114  	close(start)
   115  	wg.Wait()
   116  
   117  	// Spin up another, should execute since there is a worker available
   118  	wg.Add(1)
   119  	p.GoWithTimeout(func() {
   120  		atomic.AddUint32(&count, 1)
   121  		wg.Done()
   122  	}, time.Second*5)
   123  	wg.Wait()
   124  
   125  	require.Equal(t, uint32(testWorkerPoolSize+1), count)
   126  }
   127  
   128  func TestGoWithContext(t *testing.T) {
   129  	sleep := time.Second
   130  	goctx, cancel := stdctx.WithTimeout(stdctx.Background(), sleep)
   131  	defer cancel()
   132  	ctx := context.NewWithGoContext(goctx)
   133  	wp := NewWorkerPool(1)
   134  	wp.Init()
   135  
   136  	result := wp.GoWithContext(ctx, func() {
   137  		time.Sleep(5 * sleep)
   138  	})
   139  	require.True(t, result.Available)
   140  
   141  	result = wp.GoWithContext(ctx, func() {})
   142  	require.False(t, result.Available)
   143  }
   144  
   145  func TestFast(t *testing.T) {
   146  	wp := NewWorkerPool(1)
   147  	wp.Init()
   148  
   149  	fast := wp.FastContextCheck(3)
   150  
   151  	goctx, cancel := stdctx.WithCancel(stdctx.Background())
   152  	cancel()
   153  	ctx := context.NewWithGoContext(goctx)
   154  
   155  	require.False(t, fast.GoWithContext(ctx, func() {}).Available)
   156  	require.True(t, fast.GoWithContext(ctx, func() {}).Available)
   157  	require.True(t, fast.GoWithContext(ctx, func() {}).Available)
   158  	require.False(t, fast.GoWithContext(ctx, func() {}).Available)
   159  	require.True(t, fast.GoWithContext(ctx, func() {}).Available)
   160  }