public void WriteFirstEventFailsIfWritingIndexFails(
AtomEventWriteUsage usage,
[Frozen(As = typeof(ITypeResolver))] TestEventTypeResolver dummyResolver,
[Frozen(As = typeof(IContentSerializer))] XmlContentSerializer dummySerializer,
[Frozen] Mock <IAtomEventStorage> storeStub,
AtomEventsInMemory innerStorage,
AtomEventWriterFactory <XmlAttributedTestEventX> writerFactory,
AtomEventObserver <XmlAttributedTestEventX> sut,
XmlAttributedTestEventX @event)
{
storeStub
.Setup(s => s.CreateFeedReaderFor(It.IsAny <Uri>()))
.Returns((Uri u) => innerStorage.CreateFeedReaderFor(u));
storeStub
.Setup(s => s.CreateFeedWriterFor(
It.Is <AtomFeed>(f => f.Id != sut.Id)))
.Returns((AtomFeed f) => innerStorage.CreateFeedWriterFor(f));
var expected = new Exception("On-purpose write failure.");
storeStub
.Setup(s => s.CreateFeedWriterFor(
It.Is <AtomFeed>(f => f.Id == sut.Id)))
.Throws(expected);
var ae = Assert.Throws <AggregateException>(() =>
writerFactory.Create(usage).WriteTo(sut, @event));
Assert.True(
ae.InnerExceptions.Any(expected.Equals),
"Expected exception not thrown.");
}
public void SutEnumeratesIndexedIndexes(
AtomEventsInMemory sut,
IEnumerable <AtomFeedBuilder <DataContractTestEventX> > feedBuilders,
Mock <ITypeResolver> resolverStub)
{
resolverStub
.Setup(r => r.Resolve("test-event-x", "http://grean.rocks/dc"))
.Returns(typeof(DataContractTestEventX));
var feeds = feedBuilders
.Select(b => b.Build())
.Select(f => f.WithLinks(f.Links.Select(MakeSelfLinkIndexed)))
.ToArray();
foreach (var f in feeds)
{
using (var w = sut.CreateFeedWriterFor(f))
f.WriteTo(
w,
new DataContractContentSerializer(
resolverStub.Object));
}
var actual = sut;
var expected = new HashSet <UuidIri>(feeds.Select(f => f.Id));
Assert.True(
expected.SetEquals(actual),
"AtomEventsInMemory should yield index IDs.");
}
public void ClientCanReadSecondFeed(
AtomEventsInMemory sut,
AtomFeedBuilder<XmlAttributedTestEventX> feedBuilder1,
AtomFeedBuilder<XmlAttributedTestEventY> feedBuilder2,
XmlContentSerializer serializer)
{
var other = feedBuilder1.Build();
var expected = feedBuilder2.Build();
using (var w = sut.CreateFeedWriterFor(other))
other.WriteTo(w, serializer);
using (var w = sut.CreateFeedWriterFor(expected))
expected.WriteTo(w, serializer);
using (var r = sut.CreateFeedReaderFor(expected.Locate()))
{
var actual = AtomFeed.ReadFrom(r, serializer);
Assert.Equal(expected, actual, new AtomFeedComparer());
}
}
public void ClientCanReadSecondFeed(
AtomEventsInMemory sut,
AtomFeedBuilder <XmlAttributedTestEventX> feedBuilder1,
AtomFeedBuilder <XmlAttributedTestEventY> feedBuilder2,
XmlContentSerializer serializer)
{
var other = feedBuilder1.Build();
var expected = feedBuilder2.Build();
using (var w = sut.CreateFeedWriterFor(other))
other.WriteTo(w, serializer);
using (var w = sut.CreateFeedWriterFor(expected))
expected.WriteTo(w, serializer);
using (var r = sut.CreateFeedReaderFor(expected.Locate()))
{
var actual = AtomFeed.ReadFrom(r, serializer);
Assert.Equal(expected, actual, new AtomFeedComparer());
}
}
public void WriteWritesEventToCorrectPageEvenIfLastLinkIsNotUpToDate(
AtomEventWriteUsage usage,
[Frozen(As = typeof(ITypeResolver))] TestEventTypeResolver dummyResolver,
[Frozen(As = typeof(IContentSerializer))] XmlContentSerializer dummySerializer,
[Frozen(As = typeof(IAtomEventStorage))] AtomEventsInMemory storage,
AtomEventWriterFactory <XmlAttributedTestEventX> writerFactory,
AtomEventObserver <XmlAttributedTestEventX> sut,
Generator <XmlAttributedTestEventX> eventGenerator)
{
// Fixture setup
var writer = writerFactory.Create(usage);
var events = eventGenerator.Take(sut.PageSize * 2 + 1).ToList();
events.ForEach(e => writer.WriteTo(sut, e));
/* Point the 'last' link to the second page, instead of to the last
* page. This simulates that when the true last page was created,
* the index wasn't correctly updated. This could for example
* happen due to a network failure. */
var writtenFeeds = storage.Feeds.Select(ParseAtomFeed);
var index = FindIndex(writtenFeeds, sut.Id);
var firstPage = FindFirstPage(writtenFeeds, sut.Id);
var nextPage = FindNextPage(firstPage, writtenFeeds);
var incorrectLastLink =
nextPage.Links.Single(l => l.IsSelfLink).ToLastLink();
index = index.WithLinks(index.Links
.Where(l => !l.IsLastLink)
.Concat(new[] { incorrectLastLink }));
using (var w = storage.CreateFeedWriterFor(index))
index.WriteTo(w, sut.Serializer);
var expected = eventGenerator.First();
// Exercise system
writer.WriteTo(sut, expected);
// Verify outcome
writtenFeeds = storage.Feeds.Select(ParseAtomFeed);
index = FindIndex(writtenFeeds, sut.Id);
firstPage = FindFirstPage(writtenFeeds, sut.Id);
nextPage = FindNextPage(firstPage, writtenFeeds);
nextPage = FindNextPage(nextPage, writtenFeeds);
Assert.Equal(expected, nextPage.Entries.First().Content.Item);
Assert.Equal(
nextPage.Links.Single(l => l.IsSelfLink).Href,
index.Links.Single(l => l.IsLastLink).Href);
// Teardown
}
public void EnumerationStartsFromMostRecentEventEvenIfLastLinkIsStale(
int pageCount,
int staleCount,
[Frozen(As = typeof(ITypeResolver))] TestEventTypeResolver dummyResolver,
[Frozen(As = typeof(IContentSerializer))] XmlContentSerializer dummySerializer,
[Frozen(As = typeof(IAtomEventStorage))] AtomEventsInMemory storage,
[Frozen] UuidIri id,
LifoEvents <IXmlAttributedTestEvent> sut,
AtomEventObserver <XmlAttributedTestEventX> writer,
Generator <XmlAttributedTestEventX> eventGenerator)
{
// Fixture setup
var events =
eventGenerator.Take(writer.PageSize * pageCount + 1).ToList();
events.ForEach(writer.OnNext);
/* Point the 'last' link to an older page, instead of to the last
* page. This simulates that when the true last page was created,
* the index wasn't correctly updated. This could for example
* happen due to a network failure. */
var writtenFeeds = storage.Feeds.Select(ParseAtomFeed);
var lastPage = FindLastPage(writtenFeeds, id);
var olderPage =
FindPreviousPage(lastPage, writtenFeeds, staleCount);
var staleLastLink =
olderPage.Links.Single(l => l.IsSelfLink).ToLastLink();
var index = FindIndex(writtenFeeds, id);
index = index.WithLinks(index.Links
.Where(l => !l.IsLastLink)
.Concat(new[] { staleLastLink }));
using (var w = storage.CreateFeedWriterFor(index))
index.WriteTo(w, sut.Serializer);
// Exercise system
/* (The method being exercised is actual GetEnumerator and the
* returned implementation of IEnumerator<T>, but ToList or ToArray
* or similar methods triggers that.) */
var actual = sut.ToList();
// Verify outcome
var expected = events.AsEnumerable().Reverse();
Assert.True(
expected.SequenceEqual(actual),
"All written events should be enumerated in correct order.");
}
public void FeedsReturnWrittenFeeds(
AtomEventsInMemory sut,
IEnumerable <AtomFeedBuilder <XmlAttributedTestEventY> > feedBuilders,
XmlContentSerializer serializer)
{
var feeds = feedBuilders.Select(b => b.Build());
foreach (var f in feeds)
{
using (var w = sut.CreateFeedWriterFor(f))
f.WriteTo(w, serializer);
}
var actual = sut.Feeds.Select(s => AtomFeed.Parse(s, serializer));
var expected = new HashSet <AtomFeed>(feeds, new AtomFeedComparer());
Assert.True(
expected.SetEquals(actual),
"Written feeds should be enumerated.");
}
public void SutSeemsToBeThreadSafe(
AtomEventsInMemory sut,
Generator <AtomFeedBuilder <DataContractTestEventX> > g,
Mock <ITypeResolver> resolverStub)
{
resolverStub
.Setup(r => r.Resolve("test-event-x", "http://grean.rocks/dc"))
.Returns(typeof(DataContractTestEventX));
var feeds = g.Take(500).Select(b => b.Build()).ToArray();
var tasks = feeds
.AsParallel()
.Select(f => Task.Factory.StartNew(() =>
{
using (var w = sut.CreateFeedWriterFor(f))
f.WriteTo(
w,
new DataContractContentSerializer(
resolverStub.Object));
}))
.ToArray();
var readFeeds = feeds
.AsParallel()
.Select(f => f.Locate())
.Select(uri =>
{
using (var r = sut.CreateFeedReaderFor(uri))
return(AtomFeed.ReadFrom(
r,
new DataContractContentSerializer(
resolverStub.Object)));
})
.ToArray();
Task.WaitAll(tasks);
Assert.Equal(feeds.Length, readFeeds.Length);
}
public void SutOnlyEnumeratesIndexedIndexes(
AtomEventsInMemory sut,
Generator <AtomFeedBuilder <DataContractTestEventX> > feedBuilders,
Mock <ITypeResolver> resolverStub)
{
resolverStub
.Setup(r => r.Resolve("test-event-x", "http://grean.rocks/dc"))
.Returns(typeof(DataContractTestEventX));
var feeds = feedBuilders.Select(b => b.Build()).Take(5).ToList();
var indexes = feeds
.PickRandom(2)
.Select(f => f.WithLinks(f.Links.Select(MakeSelfLinkIndexed)))
.ToList();
var feedsToWrite = feeds
.Where(f => !indexes.Any(i => i.Id == f.Id))
.Concat(indexes)
.ToArray()
.Shuffle();
foreach (var f in feedsToWrite)
{
using (var w = sut.CreateFeedWriterFor(f))
f.WriteTo(
w,
new DataContractContentSerializer(
resolverStub.Object));
}
var actual = sut;
var expected = new HashSet <UuidIri>(indexes.Select(f => f.Id));
Assert.True(
expected.SetEquals(actual),
"AtomEventsInMemory should only yield index IDs.");
}
public void SutSeemsToBeThreadSafe(
AtomEventsInMemory sut,
Generator<AtomFeedBuilder<DataContractTestEventX>> g,
Mock<ITypeResolver> resolverStub)
{
resolverStub
.Setup(r => r.Resolve("test-event-x", "http://grean.rocks/dc"))
.Returns(typeof(DataContractTestEventX));
var feeds = g.Take(500).Select(b => b.Build()).ToArray();
var tasks = feeds
.AsParallel()
.Select(f => Task.Factory.StartNew(() =>
{
using (var w = sut.CreateFeedWriterFor(f))
f.WriteTo(
w,
new DataContractContentSerializer(
resolverStub.Object));
}))
.ToArray();
var readFeeds = feeds
.AsParallel()
.Select(f => f.Locate())
.Select(uri =>
{
using (var r = sut.CreateFeedReaderFor(uri))
return AtomFeed.ReadFrom(
r,
new DataContractContentSerializer(
resolverStub.Object));
})
.ToArray();
Task.WaitAll(tasks);
Assert.Equal(feeds.Length, readFeeds.Length);
}
public void SutOnlyEnumeratesIndexedIndexes(
AtomEventsInMemory sut,
Generator<AtomFeedBuilder<DataContractTestEventX>> feedBuilders,
Mock<ITypeResolver> resolverStub)
{
resolverStub
.Setup(r => r.Resolve("test-event-x", "http://grean.rocks/dc"))
.Returns(typeof(DataContractTestEventX));
var feeds = feedBuilders.Select(b => b.Build()).Take(5).ToList();
var indexes = feeds
.PickRandom(2)
.Select(f => f.WithLinks(f.Links.Select(MakeSelfLinkIndexed)))
.ToList();
var feedsToWrite = feeds
.Where(f => !indexes.Any(i => i.Id == f.Id))
.Concat(indexes)
.ToArray()
.Shuffle();
foreach (var f in feedsToWrite)
using (var w = sut.CreateFeedWriterFor(f))
f.WriteTo(
w,
new DataContractContentSerializer(
resolverStub.Object));
var actual = sut;
var expected = new HashSet<UuidIri>(indexes.Select(f => f.Id));
Assert.True(
expected.SetEquals(actual),
"AtomEventsInMemory should only yield index IDs.");
}
public void SutEnumeratesIndexedIndexes(
AtomEventsInMemory sut,
IEnumerable<AtomFeedBuilder<DataContractTestEventX>> feedBuilders,
Mock<ITypeResolver> resolverStub)
{
resolverStub
.Setup(r => r.Resolve("test-event-x", "http://grean.rocks/dc"))
.Returns(typeof(DataContractTestEventX));
var feeds = feedBuilders
.Select(b => b.Build())
.Select(f => f.WithLinks(f.Links.Select(MakeSelfLinkIndexed)))
.ToArray();
foreach (var f in feeds)
using (var w = sut.CreateFeedWriterFor(f))
f.WriteTo(
w,
new DataContractContentSerializer(
resolverStub.Object));
var actual = sut;
var expected = new HashSet<UuidIri>(feeds.Select(f => f.Id));
Assert.True(
expected.SetEquals(actual),
"AtomEventsInMemory should yield index IDs.");
}
public void FeedsReturnWrittenFeeds(
AtomEventsInMemory sut,
IEnumerable<AtomFeedBuilder<XmlAttributedTestEventY>> feedBuilders,
XmlContentSerializer serializer)
{
var feeds = feedBuilders.Select(b => b.Build());
foreach (var f in feeds)
using (var w = sut.CreateFeedWriterFor(f))
f.WriteTo(w, serializer);
var actual = sut.Feeds.Select(s => AtomFeed.Parse(s, serializer));
var expected = new HashSet<AtomFeed>(feeds, new AtomFeedComparer());
Assert.True(
expected.SetEquals(actual),
"Written feeds should be enumerated.");
}
public void AttemptToCorrecLastLinkDoesNotThrowOnFailure(
AtomEventWriteUsage usage,
[Frozen(As = typeof(ITypeResolver))] TestEventTypeResolver dummyResolver,
[Frozen(As = typeof(IContentSerializer))] XmlContentSerializer dummySerializer,
[Frozen] Mock <IAtomEventStorage> storeStub,
AtomEventsInMemory innerStorage,
AtomEventWriterFactory <XmlAttributedTestEventX> writerFactory,
AtomEventObserver <XmlAttributedTestEventX> sut,
Generator <XmlAttributedTestEventX> eventGenerator)
{
// Fixture setup
storeStub
.Setup(s => s.CreateFeedReaderFor(It.IsAny <Uri>()))
.Returns((Uri u) => innerStorage.CreateFeedReaderFor(u));
storeStub
.Setup(s => s.CreateFeedWriterFor(It.IsAny <AtomFeed>()))
.Returns((AtomFeed f) => innerStorage.CreateFeedWriterFor(f));
var writer = writerFactory.Create(usage);
var events = eventGenerator.Take(sut.PageSize * 2 + 1).ToList();
events.ForEach(e => writer.WriteTo(sut, e));
/* Point the 'last' link to the second page, instead of to the last
* page. This simulates that when the true last page was created,
* the index wasn't correctly updated. This could for example
* happen due to a network failure. */
var writtenFeeds = innerStorage.Feeds.Select(ParseAtomFeed);
var index = FindIndex(writtenFeeds, sut.Id);
var firstPage = FindFirstPage(writtenFeeds, sut.Id);
var nextPage = FindNextPage(firstPage, writtenFeeds);
var incorrectLastLink =
nextPage.Links.Single(l => l.IsSelfLink).ToLastLink();
index = index.WithLinks(index.Links
.Where(l => !l.IsLastLink)
.Concat(new[] { incorrectLastLink }));
using (var w = innerStorage.CreateFeedWriterFor(index))
index.WriteTo(w, sut.Serializer);
/* Configure storage to fail when writing the index, but not for
* other documents. */
storeStub
.Setup(s => s.CreateFeedWriterFor(
It.Is <AtomFeed>(f => f.Id != index.Id)))
.Returns((AtomFeed f) => innerStorage.CreateFeedWriterFor(f));
storeStub
.Setup(s => s.CreateFeedWriterFor(
It.Is <AtomFeed>(f => f.Id == index.Id)))
.Throws(new Exception("On-purpose write failure."));
var expected = eventGenerator.First();
// Exercise system
writer.WriteTo(sut, expected);
// Verify outcome
writtenFeeds = innerStorage.Feeds.Select(ParseAtomFeed);
var lastPage = FindLastPage(writtenFeeds, sut.Id);
Assert.True(
lastPage.Entries.Select(e => e.Content.Item).Any(expected.Equals),
"Last written event should be present.");
// Teardown
}
public void WriteMoreThanPageSizeDoesNotThrowWhenIndexWriteFails(
int initialPageCount,
int secondaryPageCount,
AtomEventWriteUsage usage,
[Frozen(As = typeof(ITypeResolver))] TestEventTypeResolver dummyResolver,
[Frozen(As = typeof(IContentSerializer))] XmlContentSerializer dummySerializer,
[Frozen] Mock <IAtomEventStorage> storeStub,
AtomEventsInMemory innerStorage,
AtomEventWriterFactory <XmlAttributedTestEventX> writerFactory,
AtomEventObserver <XmlAttributedTestEventX> sut,
Generator <XmlAttributedTestEventX> eventGenerator)
{
// Fixture setup
storeStub
.Setup(s => s.CreateFeedReaderFor(It.IsAny <Uri>()))
.Returns((Uri u) => innerStorage.CreateFeedReaderFor(u));
storeStub
.Setup(s => s.CreateFeedWriterFor(It.IsAny <AtomFeed>()))
.Returns((AtomFeed f) => innerStorage.CreateFeedWriterFor(f));
var writer = writerFactory.Create(usage);
/* Write some pages full. */
var events =
eventGenerator.Take(sut.PageSize * initialPageCount).ToList();
events.ForEach(e => writer.WriteTo(sut, e));
/* Find the index. */
var writtenFeeds = innerStorage.Feeds.Select(ParseAtomFeed);
var index = FindIndex(writtenFeeds, sut.Id);
/* Configure storage to fail when writing the index, but not for
* other documents. */
storeStub
.Setup(s => s.CreateFeedWriterFor(
It.Is <AtomFeed>(f => f.Id != index.Id)))
.Returns((AtomFeed f) => innerStorage.CreateFeedWriterFor(f));
storeStub
.Setup(s => s.CreateFeedWriterFor(
It.Is <AtomFeed>(f => f.Id == index.Id)))
.Throws(new Exception("On-purpose write failure."));
/* Write some more pages, this time with the index update
* consistently failing. */
eventGenerator
.Take(sut.PageSize * secondaryPageCount)
.ToList()
.ForEach(e => writer.WriteTo(sut, e));
// Exercise system
var expected = eventGenerator.Take(sut.PageSize).ToList();
expected.ForEach(e => writer.WriteTo(sut, e));
// Verify outcome
writtenFeeds = innerStorage.Feeds.Select(ParseAtomFeed);
var lastPage = FindLastPage(writtenFeeds, sut.Id);
Assert.True(
lastPage.Entries
.Select(e => e.Content.Item)
.Reverse()
.SequenceEqual(expected),
"Last written events should be present."
);
// Teardown
}