public void should_synchronize_initialization()
{
// While it's possible for multiple initializations to occur,
// the framework will attempt to minimize duplicate initialization
// by sychronizing subsequent threads after the first initialization
// has begun.
// Each time the cache is initialized the
// value of this object will be incremented
// after a simulated delay.
var value = new IncrementingCachedObject();
var variable = GetBuilderOfLong()
.WithKey(GenerateRandomKey())
.InitializeWith(value.Increment)
.TimeoutAfter(10.Seconds())
.Create();
// Start the new initialization
var initial = new Task <long>(() => variable.Value);
initial.Start();
// Introduce a small delay to ensure the initial thread has time to start.
Thread.Sleep(1000);
// Simulate additional threads requesting the same resource.
var competingThreads = new[] {
Task.Factory.StartNew(() => variable.Value),
Task.Factory.StartNew(() => variable.Value),
Task.Factory.StartNew(() => variable.Value),
Task.Factory.StartNew(() => variable.Value),
Task.Factory.StartNew(() => variable.Value)
};
// This is the result of the first initialization
var result = initial.Result;
// All competing initializations should have the same value.
foreach (var task in competingThreads)
{
task.Result.Should().Be(result);
}
}
public void should_synchronize_initialization()
{
// While it's possible for multiple initializations to occur,
// the framework will attempt to minimize duplicate initialization
// by sychronizing subsequent threads after the first initialization
// has begun.
// Each time the cache is initialized the
// value of this object will be incremented
// after a simulated delay.
var value = new IncrementingCachedObject();
var variable = GetBuilderOfLong()
.WithKey(GenerateRandomKey())
.InitializeWith(value.Increment)
.TimeoutAfter(10.Seconds())
.Create();
// Start the new initialization
var initial = new Task<long>(() => variable.Value);
initial.Start();
// Introduce a small delay to ensure the initial thread has time to start.
Thread.Sleep(1000);
// Simulate additional threads requesting the same resource.
var competingThreads = new[] {
Task.Factory.StartNew(() => variable.Value),
Task.Factory.StartNew(() => variable.Value),
Task.Factory.StartNew(() => variable.Value),
Task.Factory.StartNew(() => variable.Value),
Task.Factory.StartNew(() => variable.Value)
};
// This is the result of the first initialization
var result = initial.Result;
// All competing initializations should have the same value.
foreach (var task in competingThreads) {
task.Result.Should().Be(result);
}
}