public void When_non_transient_exception_thrown_then_should_retry()
{
var sut = new TransientExceptionRetryPolicy(TimeSpan.FromMilliseconds(1), TimeSpan.FromMilliseconds(10));
Func<Task> act = () => sut.Retry(() => { throw new Exception(); }, CancellationToken.None);
act.ShouldThrow<Exception>();
}
public void When_non_transient_exception_thrown_then_should_retry()
{
var sut = new TransientExceptionRetryPolicy(TimeSpan.FromMilliseconds(1), TimeSpan.FromMilliseconds(10));
Func <Task> act = () => sut.Retry(() => { throw new Exception(); }, CancellationToken.None);
act.ShouldThrow <Exception>();
}
/// <summary>
/// Initializes a new instance of the <see cref="DurableCommitDispatcher"/> class.
/// </summary>
/// <param name="eventStoreClient">An event store client.</param>
/// <param name="checkpointRepository">A checkpoint repository. Each instane of a <see cref="DurableCommitDispatcher"/>
/// should have their own instance of a <see cref="ICheckpointRepository"/>.</param>
/// <param name="handlerModules">A collection of handler modules to dispatch the commit to.</param>
/// <param name="retryPolicy">A retry policy when a <see cref="TransientException"/> occurs.
/// If none specified TransientException.None is used.</param>
/// <exception cref="System.ArgumentNullException">
/// eventStoreClient
/// or
/// checkpointRepository
/// or
/// dispatchCommit
/// </exception>
public DurableCommitDispatcher(
[NotNull] IEventStoreClient eventStoreClient,
[NotNull] ICheckpointRepository checkpointRepository,
[NotNull] IEnumerable<IHandlerResolver> handlerModules,
TransientExceptionRetryPolicy retryPolicy = null):
this(eventStoreClient, checkpointRepository, handlerModules.DispatchCommit, retryPolicy )
{
Guard.EnsureNotNull(handlerModules, "handlerModule");
}
/// <summary>
/// Initializes a new instance of the <see cref="DurableCommitDispatcher"/> class.
/// </summary>
/// <param name="eventStoreClient">An event store client.</param>
/// <param name="checkpointRepository">A checkpoint repository. Each instane of a <see cref="DurableCommitDispatcher"/>
/// should have their own instance of a <see cref="ICheckpointRepository"/>.</param>
/// <param name="handlerModules">A collection of handler modules to dispatch the commit to.</param>
/// <param name="retryPolicy">A retry policy when a <see cref="TransientException"/> occurs.
/// If none specified TransientException.None is used.</param>
/// <exception cref="System.ArgumentNullException">
/// eventStoreClient
/// or
/// checkpointRepository
/// or
/// dispatchCommit
/// </exception>
public DurableCommitDispatcher(
[NotNull] IEventStoreClient eventStoreClient,
[NotNull] ICheckpointRepository checkpointRepository,
[NotNull] IEnumerable <IHandlerResolver> handlerModules,
TransientExceptionRetryPolicy retryPolicy = null) :
this(eventStoreClient, checkpointRepository, handlerModules.DispatchCommit, retryPolicy)
{
Guard.EnsureNotNull(handlerModules, "handlerModule");
}
/// <summary>
/// Initializes a new instance of the <see cref="DurableCommitDispatcher"/> class.
/// </summary>
/// <param name="eventStoreClient">An event store client.</param>
/// <param name="checkpointRepository">A checkpoint repository. Each instane of a <see cref="DurableCommitDispatcher"/>
/// should have their own instance of a <see cref="ICheckpointRepository"/>.</param>
/// <param name="dispatchCommit">A handler to dispatch the commit to.</param>
/// <param name="retryPolicy">A retry policy when a <see cref="TransientException"/> occurs.
/// If none specified TransientException.None is used.</param>
/// <exception cref="System.ArgumentNullException">
/// eventStoreClient
/// or
/// checkpointRepository
/// or
/// dispatchCommit
/// </exception>
public DurableCommitDispatcher(
[NotNull] IEventStoreClient eventStoreClient,
[NotNull] ICheckpointRepository checkpointRepository,
[NotNull] Func <ICommit, CancellationToken, Task> dispatchCommit,
TransientExceptionRetryPolicy retryPolicy = null)
{
Guard.EnsureNotNull(eventStoreClient, "eventStoreClient");
Guard.EnsureNotNull(checkpointRepository, "checkpointRepository");
Guard.EnsureNotNull(dispatchCommit, "dispatchCommit");
_eventStoreClient = eventStoreClient;
_checkpointRepository = checkpointRepository;
_dispatchCommit = dispatchCommit;
_retryPolicy = retryPolicy ?? TransientExceptionRetryPolicy.None();
}
public void When_transient_exception_thrown_indefinitely_then_should_repeatedly_retry_until_duration_and_then_throw()
{
var duration = TimeSpan.FromSeconds(1);
var stopwatch = Stopwatch.StartNew();
var sut = new TransientExceptionRetryPolicy(TimeSpan.FromMilliseconds(1), duration);
int count = 0;
Func <Task> act = () => sut.Retry(() =>
{
count++;
throw new TransientException();
}, CancellationToken.None);
act.ShouldThrow <TransientException>();
count.Should().BeGreaterThan(1);
stopwatch.Elapsed.Should().BeGreaterThan(duration);
}
public void When_transient_exception_thrown_indefinitely_then_should_repeatedly_retry_until_duration_and_then_throw()
{
var duration = TimeSpan.FromSeconds(1);
var stopwatch = Stopwatch.StartNew();
var sut = new TransientExceptionRetryPolicy(TimeSpan.FromMilliseconds(1), duration);
int count = 0;
Func<Task> act = () => sut.Retry(() =>
{
count++;
throw new TransientException();
}, CancellationToken.None);
act.ShouldThrow<TransientException>();
count.Should().BeGreaterThan(1);
stopwatch.Elapsed.Should().BeGreaterThan(duration);
}
public async Task Transient_policy_none_should_not_retry()
{
var sut = TransientExceptionRetryPolicy.None();
int count = 0;
Func <Task> act = () => sut.Retry(() =>
{
count++;
if (count == 1)
{
throw new TransientException();
}
return(Task.FromResult(0));
}, CancellationToken.None);
act.ShouldThrow <TransientException>();
count.Should().Be(1);
}
public async Task When_transient_exception_thrown_once_then_should_retry()
{
var sut = new TransientExceptionRetryPolicy(TimeSpan.FromMilliseconds(1), TimeSpan.FromSeconds(1));
int count = 0;
var tcs = new TaskCompletionSource <bool>();
await sut.Retry(() =>
{
count++;
if (count == 2)
{
tcs.SetResult(true);
return(Task.FromResult(0));
}
throw new TransientException();
}, CancellationToken.None);
await tcs.Task;
count.Should().Be(2);
}
public async Task When_transient_exception_thrown_once_then_should_retry()
{
var sut = new TransientExceptionRetryPolicy(TimeSpan.FromMilliseconds(1), TimeSpan.FromSeconds(1));
int count = 0;
var tcs = new TaskCompletionSource<bool>();
await sut.Retry(() =>
{
count++;
if (count == 2)
{
tcs.SetResult(true);
return Task.FromResult(0);
}
throw new TransientException();
}, CancellationToken.None);
await tcs.Task;
count.Should().Be(2);
}
/// <summary>
/// Initializes a new instance of the <see cref="DurableCommitDispatcher"/> class.
/// </summary>
/// <param name="eventStoreClient">An event store client.</param>
/// <param name="checkpointRepository">A checkpoint repository. Each instane of a <see cref="DurableCommitDispatcher"/>
/// should have their own instance of a <see cref="ICheckpointRepository"/>.</param>
/// <param name="dispatchCommit">A handler to dispatch the commit to.</param>
/// <param name="retryPolicy">A retry policy when a <see cref="TransientException"/> occurs.
/// If none specified TransientException.None is used.</param>
/// <exception cref="System.ArgumentNullException">
/// eventStoreClient
/// or
/// checkpointRepository
/// or
/// dispatchCommit
/// </exception>
public DurableCommitDispatcher(
[NotNull] IEventStoreClient eventStoreClient,
[NotNull] ICheckpointRepository checkpointRepository,
[NotNull] Func<ICommit, CancellationToken, Task> dispatchCommit,
TransientExceptionRetryPolicy retryPolicy = null)
{
Guard.EnsureNotNull(eventStoreClient, "eventStoreClient");
Guard.EnsureNotNull(checkpointRepository, "checkpointRepository");
Guard.EnsureNotNull(dispatchCommit, "dispatchCommit");
_eventStoreClient = eventStoreClient;
_checkpointRepository = checkpointRepository;
_dispatchCommit = dispatchCommit;
_retryPolicy = retryPolicy ?? TransientExceptionRetryPolicy.None();
_compositeDisposable.Add(_commitsProjectedStream);
}
