private static void WeakKey()
{
var people = new[]
{
new Person {Id = 1, Name = "Jurian Naul" },
new Person {Id = 2, Name = "Thomas Bent" },
new Person {Id = 3, Name = "Ellen Carson" },
new Person {Id = 4, Name = "Katrina Lauran" },
new Person {Id = 5, Name = "Monica Ausbach" },
};
var locations = new ConditionalWeakTable<Person, string>();
locations.Add(people[0], "Shinon");
locations.Add(people[1], "Lance");
locations.Add(people[2], "Pidona");
locations.Add(people[3], "Loanne");
locations.Add(people[4], "Loanne");
foreach (var p in people)
{
string location;
if (locations.TryGetValue(p, out location))
Console.WriteLine(p.Name + " at " + location);
}
}
public static void InvalidArgs_Throws()
{
var cwt = new ConditionalWeakTable<object, object>();
object ignored;
Assert.Throws<ArgumentNullException>("key", () => cwt.Add(null, new object())); // null key
Assert.Throws<ArgumentNullException>("key", () => cwt.TryGetValue(null, out ignored)); // null key
Assert.Throws<ArgumentNullException>("key", () => cwt.Remove(null)); // null key
Assert.Throws<ArgumentNullException>("createValueCallback", () => cwt.GetValue(new object(), null)); // null delegate
object key = new object();
cwt.Add(key, key);
Assert.Throws<ArgumentException>(null, () => cwt.Add(key, key)); // duplicate key
}
public static void AddMany_ThenRemoveAll(int numObjects)
{
object[] keys = Enumerable.Range(0, numObjects).Select(_ => new object()).ToArray();
object[] values = Enumerable.Range(0, numObjects).Select(_ => new object()).ToArray();
var cwt = new ConditionalWeakTable<object, object>();
for (int i = 0; i < numObjects; i++)
{
cwt.Add(keys[i], values[i]);
}
for (int i = 0; i < numObjects; i++)
{
Assert.Same(values[i], cwt.GetValue(keys[i], _ => new object()));
}
for (int i = 0; i < numObjects; i++)
{
Assert.True(cwt.Remove(keys[i]));
Assert.False(cwt.Remove(keys[i]));
}
for (int i = 0; i < numObjects; i++)
{
object ignored;
Assert.False(cwt.TryGetValue(keys[i], out ignored));
}
}
public void Should_release_value_when_there_are_no_more_references()
{
var table = new ConditionalWeakTable<TypeWithStrongReferenceThroughTable, TypeWithWeakReference>();
var strong = new TypeWithStrongReferenceThroughTable();
var weak = new TypeWithWeakReference()
{
WeakReference = new WeakReference(strong)
};
table.Add(strong, weak);
GC.Collect();
TypeWithWeakReference result = null;
Assert.That(table.TryGetValue(strong, out result), Is.True);
Assert.That(result, Is.SameAs(weak));
var weakHandleToStrong = new WeakReference(strong);
strong = null;
GC.Collect();
Assert.That(weakHandleToStrong.IsAlive, Is.False);
}
public static NamingStylePreferences GetNamingStylesFromDictionary(IReadOnlyDictionary <string, object> allRawConventions)
{
if (_cache.TryGetValue(allRawConventions, out var value))
{
return(value);
}
lock (_cacheLock)
{
if (!_cache.TryGetValue(allRawConventions, out value))
{
value = ParseDictionary(allRawConventions);
_cache.Add(allRawConventions, value);
}
return(value);
}
}
public static NamingStylePreferences GetNamingStylesFromDictionary(IReadOnlyDictionary <string, string> rawOptions)
{
if (_cache.TryGetValue(rawOptions, out var value))
{
return(value);
}
lock (_cacheLock)
{
if (!_cache.TryGetValue(rawOptions, out value))
{
value = ParseDictionary(rawOptions);
_cache.Add(rawOptions, value);
}
return(value);
}
}
public override async Task Invoke(IOwinContext context)
{
bool bodyIsJson = context.Request.ContentType?.Contains(ContentType.Json) ?? false;
if (bodyIsJson && (context.Request.Method == Http.POST || context.Request.Method == Http.PUT))
{
var json = await Common.Utils.CommonUtils.GetRequestBodyFromRequestStream(context.Request);
var body = JToken.Parse(json);
RequestJsonBody.Add(context.Request, body);
}
await Next.Invoke(context);
if (bodyIsJson)
{
RequestJsonBody.Remove(context.Request);
}
}
/*
* Ensure that a key whose value has a reference to the key or a reference to another object
* which has a reference to the key, gets automatically removed from the dictionary after GC
* happens (provided there are no references to the value outside the dictionary.)
* Also make sure the value gets gc’d as well.
*
* In this case we pass the same string array to the function, so keys and values have references to each other
* (But only within the dictionary)
* */
public static void TestKeyWithInsideReferences_Pass1(int length)
{
tbl = new ConditionalWeakTable <string, string>();
weakRefKeyArr = new WeakReference[length];
weakRefValArr = new WeakReference[length];
for (int i = 0; i < length; i++)
{
String key = "SomeTestString" + i.ToString();
String value = key;
tbl.Add(key, value);
// create a weak reference for the key
weakRefKeyArr[i] = new WeakReference(key, true);
weakRefValArr[i] = new WeakReference(value, true);
}
}
public static LinkerConfiguration GetInstance(LinkContext context, bool createIfNotFound = true)
{
if (!configurations.TryGetValue(context, out var instance) && createIfNotFound)
{
if (!context.TryGetCustomData("LinkerOptionsFile", out var linker_options_file))
{
throw new Exception($"No custom linker options file was passed to the linker (using --custom-data LinkerOptionsFile=...");
}
instance = new LinkerConfiguration(linker_options_file)
{
Context = context,
};
configurations.Add(context, instance);
}
return(instance);
}
static void Main(string[] args)
{
var table = new ConditionalWeakTable <string, Foo>
{
{ "walterlv", new Foo("吕毅") },
{ "lindexi", new Foo("林德熙") },
};
var time = DateTime.Now.ToString("T");
table.Add(time, new Foo("时间"));
time = null;
Console.WriteLine($"开始个数：{table.Count()}");
GC.Collect();
Console.WriteLine($"剩余个数：{table.Count()}");
Console.ReadLine();
}
private void SubscribeToDownloadProgress(IPackageDetails packageDetails)
{
Argument.IsNotNull(() => packageDetails);
var packageDownloader = GetPackageDownloaderInstance(packageDetails);
if (packageDownloader == null)
{
return;
}
var weakEvent = this.SubscribeToWeakGenericEvent <ProgressEventArgs>(packageDownloader, "ProgressAvailable", OnPackageDownloadProgress);
if (weakEvent != null)
{
_packageEvents.Add(packageDetails, weakEvent);
}
}
public T[] Take <T>(int minimumLength)
{
var buffer = ArrayPool <T> .Shared.Rent(minimumLength);
AtomicCounter cnt;
if (_cwt.TryGetValue(buffer, out cnt))
{
Interlocked.Increment(ref cnt.Count);
}
else
{
_cwt.Add(buffer, new AtomicCounter {
Count = 1
});
}
return(buffer);
}
/*
* Ensure that a key that has no managed references to it gets automatically removed from the
* dictionary after GC happens. Also make sure the value gets gc’d as well.
*/
public static void TestKeyWithNoReferences_Pass1(int length)
{
tbl = new ConditionalWeakTable<string, string>();
weakRefKeyArr = new WeakReference[length];
weakRefValArr = new WeakReference[length];
for (int i = 0; i < length; i++)
{
String key = "KeyTestString" + i.ToString();
String value = "ValueTestString" + i.ToString();
tbl.Add(key, value);
// create a weak reference for the key
weakRefKeyArr[i] = new WeakReference(key, true);
weakRefValArr[i] = new WeakReference(value, true);
}
}
private (ModuleMetadata metadata, ITemporaryStreamStorage storage) ReadModuleMetadataFrom(
ObjectReader reader, SerializationKinds kind, CancellationToken cancellationToken)
{
cancellationToken.ThrowIfCancellationRequested();
GetTemporaryStorage(reader, kind, out var storage, out var length, cancellationToken);
var storageStream = storage.ReadStream(cancellationToken);
Contract.ThrowIfFalse(length == storageStream.Length);
GetMetadata(storageStream, length, out var metadata, out var lifeTimeObject);
// make sure we keep storageStream alive while Metadata is alive
// we use conditional weak table since we can't control metadata liftetime
s_lifetimeMap.Add(metadata, lifeTimeObject);
return(metadata, storage);
}
public VersionedSagaEntity(IContainSagaData sagaData, string lockTokenKey, VersionedSagaEntity original = null)
{
LockTokenKey = lockTokenKey;
SagaData = DeepClone(sagaData);
if (original != null)
{
original.ConcurrencyCheck(sagaData);
versionCache = original.versionCache;
version = original.version;
version++;
}
else
{
versionCache = new ConditionalWeakTable <IContainSagaData, SagaVersion>();
versionCache.Add(sagaData, new SagaVersion(version));
}
}
public void HandleCall(object instance, string methodIdentifier, object[] args, Type[] argTypes)
{
if (instance is INotifyPropertyChanged inpc && methodIdentifier.IndexOf(" .ctor ", StringComparison.InvariantCultureIgnoreCase) != -1)
{
var typeName = instance.GetType().FullName;
if (_ignoredViewModels.Any(toIgnore => string.Equals(toIgnore, typeName)))
{
return;
}
// Base constructors would cause the same instance to be added without this check
if (!_inpcInfos.TryGetValue(inpc, out _))
{
_inpcInfos.Add(inpc, new InstanceInfo(_uniqueId++, args, argTypes));
}
}
}
public static JavaProxyObject GetProxy(object value)
{
if (value == null)
{
return(null);
}
lock (CachedValues) {
JavaProxyObject proxy;
if (CachedValues.TryGetValue(value, out proxy))
{
return(proxy);
}
proxy = new JavaProxyObject(value);
CachedValues.Add(value, proxy);
return(proxy);
}
}
public static void Concurrent_Add_Read_Remove_DifferentObjects()
{
var cwt = new ConditionalWeakTable <object, object>();
DateTime end = DateTime.UtcNow + TimeSpan.FromSeconds(0.25);
Parallel.For(0, Environment.ProcessorCount, i =>
{
while (DateTime.UtcNow < end)
{
object key = new object();
object value = new object();
cwt.Add(key, value);
Assert.Same(value, cwt.GetValue(key, _ => new object()));
Assert.True(cwt.Remove(key));
Assert.False(cwt.Remove(key));
}
});
}
internal static EventHandler <object> GetValueFromEquivalentKey(
ConditionalWeakTable <EventHandler, EventHandler <object> > table,
EventHandler key,
ConditionalWeakTable <EventHandler, EventHandler <object> > .CreateValueCallback callback)
{
EventHandler <object> value;
// Find the key in the table using a value check rather than an instance check.
EventHandler existingKey = table.FindEquivalentKeyUnsafe(key, out value);
if (existingKey == null)
{
value = callback(key);
table.Add(key, value);
}
return(value);
}
/// <summary>
/// Create a factory delegate for creating instances of the specified actor type.
/// </summary>
/// <param name="actorType">
/// The type of actor to create.
/// </param>
/// <returns>
/// A delegate that returns new instances of the actor.
/// </returns>
public Func <ActorBase> CreateActorFactory(Type actorType)
{
if (actorType == null)
{
throw new ArgumentNullException(nameof(actorType));
}
return(() =>
{
var scope = _scopeFactory.CreateScope();
var actorRef = scope.ServiceProvider.GetService(actorType);
var actor = actorRef as ActorBase;
_references.Add(actor, scope);
return actor;
});
}
internal static EventHandler <object> GetValueFromEquivalentKey(
ConditionalWeakTable <EventHandler, EventHandler <object> > table,
EventHandler key,
ConditionalWeakTable <EventHandler, EventHandler <object> > .CreateValueCallback callback)
{
foreach (KeyValuePair <EventHandler, EventHandler <object> > item in table)
{
if (object.Equals(item.Key, key))
{
return(item.Value);
}
}
EventHandler <object> value = callback(key);
table.Add(key, value);
return(value);
}
[Category("NotWorking")] // No ephemerons
public void OldGenKeysMakeNewGenObjectsReachable()
{
if (GC.MaxGeneration == 0) /*Boehm doesn't handle ephemerons */
{
Assert.Ignore("Not working on Boehm.");
}
var table = new ConditionalWeakTable <object, Val>();
var keys = new List <Key>();
//
// This list references all keys for the duration of the program, so none
// should be collected ever.
//
for (var x = 0; x < 1000; x++)
{
keys.Add(new Key {
Foo = x
});
}
for (var i = 0; i < 1000; ++i)
{
// Insert all keys into the ConditionalWeakTable
foreach (var key in keys)
{
table.Add(key, new Val {
Foo = key.Foo
});
}
// Look up all keys to verify that they are still there
foreach (var key in keys)
{
Assert.IsTrue(table.TryGetValue(key, out _), "#1-" + i.ToString() + "-k-" + key);
}
// Remove all keys from the ConditionalWeakTable
foreach (var key in keys)
{
Assert.IsTrue(table.Remove(key), "#2-" + i.ToString() + "-k-" + key);
}
}
}
PEFile LoadAssembly(object state)
{
MetadataReaderOptions options;
if (DecompilerSettingsPanel.CurrentDecompilerSettings.ApplyWindowsRuntimeProjections)
{
options = MetadataReaderOptions.ApplyWindowsRuntimeProjections;
}
else
{
options = MetadataReaderOptions.None;
}
PEFile module;
// runs on background thread
if (state is Stream stream)
{
// Read the module from a precrafted stream
module = new PEFile(fileName, stream, metadataOptions: options);
}
else
{
// Read the module from disk (by default)
stream = new FileStream(fileName, FileMode.Open, FileAccess.Read);
module = new PEFile(fileName, stream, PEStreamOptions.PrefetchEntireImage,
metadataOptions: options);
}
if (DecompilerSettingsPanel.CurrentDecompilerSettings.UseDebugSymbols)
{
try {
this.debugInfoProvider = DebugInfoLoader.LoadSymbols(module);
} catch (IOException) {
} catch (UnauthorizedAccessException) {
} catch (InvalidOperationException) {
// ignore any errors during symbol loading
}
}
lock (loadedAssemblies) {
loadedAssemblies.Add(module, this);
}
return(module);
}
public static void RenderPath(this WorldView world, IVertexSource vertexSource, Color color, bool doDepthTest)
{
AAGLTesselator tesselator;
if (!TesselatorsByWorld.TryGetValue(world, out tesselator))
{
// Update reference and store in dictionary
tesselator = new AAGLTesselator(world);
TesselatorsByWorld.Add(world, tesselator);
}
// TODO: Necessary?
// CheckLineImageCache();
// GL.Enable(EnableCap.Texture2D);
// GL.BindTexture(TextureTarget.Texture2D, RenderOpenGl.ImageGlPlugin.GetImageGlPlugin(AATextureImages[color.Alpha0To255], false).GLTextureHandle);
// the source is always all white so has no does not have its color changed by the alpha
GL.BlendFunc(BlendingFactorSrc.One, BlendingFactorDest.OneMinusSrcAlpha);
GL.Enable(EnableCap.Blend);
GL.Disable(EnableCap.CullFace);
GL.Disable(EnableCap.Lighting);
if (doDepthTest)
{
GL.Enable(EnableCap.DepthTest);
}
else
{
GL.Disable(EnableCap.DepthTest);
}
vertexSource.rewind(0);
// the alpha has to come from the bound texture
GL.Color4(color.red, color.green, color.blue, (byte)255);
tesselator.Clear();
VertexSourceToTesselator.SendShapeToTesselator(tesselator, vertexSource);
// now render it
tesselator.RenderLastToGL();
}
public static unsafe PEReader OpenPEFile(string filePath, byte[] moduleBytes, out MemoryMappedViewAccessor mappedViewAccessor)
{
// If moduleBytes is specified create PEReader from the in memory array, not from a file on disk
if (moduleBytes != null)
{
var peReader = new PEReader(ImmutableArray.Create <byte>(moduleBytes));
mappedViewAccessor = null;
return(peReader);
}
// System.Reflection.Metadata has heuristic that tries to save virtual address space. This heuristic does not work
// well for us since it can make IL access very slow (call to OS for each method IL query). We will map the file
// ourselves to get the desired performance characteristics reliably.
FileStream fileStream = null;
MemoryMappedFile mappedFile = null;
MemoryMappedViewAccessor accessor = null;
try
{
// Create stream because CreateFromFile(string, ...) uses FileShare.None which is too strict
fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read, bufferSize: 1);
mappedFile = MemoryMappedFile.CreateFromFile(
fileStream, null, fileStream.Length, MemoryMappedFileAccess.Read, HandleInheritability.None, true);
accessor = mappedFile.CreateViewAccessor(0, 0, MemoryMappedFileAccess.Read);
var safeBuffer = accessor.SafeMemoryMappedViewHandle;
var peReader = new PEReader((byte *)safeBuffer.DangerousGetHandle(), (int)safeBuffer.ByteLength);
s_peReaderToPath.Add(peReader, filePath);
// MemoryMappedFile does not need to be kept around. MemoryMappedViewAccessor is enough.
mappedViewAccessor = accessor;
accessor = null;
return(peReader);
}
finally
{
accessor?.Dispose();
mappedFile?.Dispose();
fileStream?.Dispose();
}
}
protected virtual void ShowWindowViewController(
NSViewController viewController,
MvxWindowPresentationAttribute attribute,
MvxViewModelRequest request)
{
NSWindow window = null;
MvxWindowController windowController = null;
if (!string.IsNullOrEmpty(attribute.WindowControllerName))
{
windowController = CreateWindowController(attribute);
window = windowController.Window;
}
if (window == null)
{
window = CreateWindow(attribute);
if (windowController == null)
{
windowController = CreateWindowController(window);
windowController.ShouldCascadeWindows = attribute.ShouldCascadeWindows ?? MvxWindowPresentationAttribute.DefaultShouldCascadeWindows;
}
windowController.Window = window;
}
else
{
UpdateWindow(attribute, window);
}
window.Identifier = attribute.Identifier ?? viewController.GetType().Name;
if (!string.IsNullOrEmpty(viewController.Title))
{
window.Title = viewController.Title;
}
Windows.Add(window);
window.ContentView = viewController.View;
window.ContentViewController = viewController;
windowController.ShowWindow(null);
_windowsToWindowControllers.Add(window, windowController);
}
public void Remove()
{
var cwt = new ConditionalWeakTable <object, object>();
object c = new Key();
cwt.Add(c, "x");
try
{
cwt.Remove(null);
Assert.Fail("#0");
}
catch (ArgumentNullException) { }
Assert.IsFalse(cwt.Remove("x"), "#1");
Assert.IsTrue(cwt.Remove(c), "#2");
Assert.IsFalse(cwt.Remove(c), "#3");
}
/// <summary>
/// Create the child ContentPresenter for the given item (could be data or a TabItem)
/// </summary>
/// <param name="item">The item.</param>
private void CreateChildContentPresenter(object item)
{
if (item == null)
{
return;
}
object dummyObject = null;
if (_wrappedContainers.TryGetValue(item, out dummyObject))
{
return;
}
_wrappedContainers.Add(item, new object());
var cp = FindChildContentPresenter(item);
if (cp != null)
{
return;
}
// the actual child to be added. cp.Tag is a reference to the TabItem
cp = new ContentPresenter();
var container = GetContentContainer(item);
var content = GetContent(item);
var tabItemData = new TabControlItemData(container, content, ContentTemplate, item);
cp.Tag = tabItemData;
if (!IsLazyLoading)
{
ShowChildContent(cp, tabItemData);
}
cp.ContentTemplateSelector = ContentTemplateSelector;
cp.ContentStringFormat = SelectedContentStringFormat;
_itemsHolder.Children.Add(cp);
}
public void TryGetValue()
{
var cwt = new ConditionalWeakTable <object, object>();
object res;
object c = new Key();
cwt.Add(c, "foo");
try
{
cwt.TryGetValue(null, out res);
Assert.Fail("#0");
}
catch (ArgumentNullException) { }
Assert.IsFalse(cwt.TryGetValue("foo", out res), "#1");
Assert.IsTrue(cwt.TryGetValue(c, out res), "#2");
Assert.AreEqual("foo", res, "#3");
}
public BufferPool Get()
{
if (!_threadLocal.IsValueCreated)
{
var bufferPool = new BufferPool(_serializationService);
_strongReferences.Add(Thread.CurrentThread, bufferPool);
_threadLocal.Value = new WeakReference(bufferPool);
return(bufferPool);
}
else
{
var bufferPool = _threadLocal.Value.Target as BufferPool;
if (bufferPool == null)
{
throw new HazelcastInstanceNotActiveException();
}
return(bufferPool);
}
}
public static void Clear_AddThenEmptyRepeatedly_ItemsRemoved()
{
var cwt = new ConditionalWeakTable <object, object>();
object key = new object(), value = new object();
object result;
for (int i = 0; i < 3; i++)
{
cwt.Add(key, value);
Assert.True(cwt.TryGetValue(key, out result));
Assert.Same(value, result);
cwt.Clear();
Assert.False(cwt.TryGetValue(key, out result));
Assert.Null(result);
}
}
/// <summary>
/// Computes an unique runtime id (32bits) valid for the specified <see cref="object"/>.
/// </summary>
/// <returns>An unique runtime identifier (32bits)</returns>
public static int ToRuntimeId(object instance)
{
if (instance == null)
{
return(0);
}
lock (RuntimeIds)
{
object rtid;
if (!RuntimeIds.TryGetValue(instance, out rtid))
{
count++;
rtid = count;
RuntimeIds.Add(instance, rtid);
}
return((int)rtid);
}
}
private static Dictionary <string, DataAcessor> GetDataAcessors(this IGetDataItems data)
{
//do acessos already exist
Dictionary <string, DataAcessor> acessors;
if (DataAcessorLut.TryGetValue(data, out acessors))
{
return(acessors);
}
else
{
//make all acessors for this type and cache
acessors = makeDataAcessors(data);
DataAcessorLut.Add(data, acessors);
//return the result
return(acessors);
}
}
void IWpfTextViewConnectionListener.SubjectBuffersConnected(IWpfTextView textView, ConnectionReason reason, Collection <ITextBuffer> subjectBuffers)
{
lock (s_gate)
{
// only add roslyn type to tracking map
foreach (var buffer in subjectBuffers.Where(b => IsSupportedContentType(b.ContentType)))
{
if (!s_map.TryGetValue(buffer, out var set))
{
set = new HashSet <ITextView>();
s_map.Add(buffer, set);
}
set.Add(textView);
DebugRegisterView_NoLock(textView);
}
}
this.SubjectBuffersConnected?.Invoke(this, new SubjectBuffersConnectedEventArgs(textView, subjectBuffers.ToReadOnlyCollection()));
}
private static async Task <ImmutableArray <SearchResult> > TryFilterPreviousSearchResultsAsync(
Project project, Document searchDocument, string pattern,
PatternMatcher nameMatcher, PatternMatcher containerMatcherOpt,
ArrayBuilder <PatternMatch> nameMatches, ArrayBuilder <PatternMatch> containerMatches,
CancellationToken cancellationToken)
{
// Searching an entire project. See if we already performed that same
// search with a substring of the current pattern. if so, we can use
// the previous result and just filter that down. This is useful for
// the common case where a user types some pattern, then keeps adding
// to it.
ImmutableArray <SearchResult> searchResults;
if (s_lastProjectSearchCache.TryGetValue(project, out var previousResult) &&
pattern.StartsWith(previousResult.Item1))
{
// We can reuse the previous results and just filter them.
searchResults = FilterPreviousResults(
previousResult.Item2,
nameMatcher, containerMatcherOpt,
nameMatches, containerMatches, cancellationToken);
}
else
{
// Didn't have previous results. Or it was a very different pattern.
// Can't reuse.
searchResults = await ComputeSearchResultsAsync(
project, searchDocument,
nameMatcher, containerMatcherOpt,
nameMatches, containerMatches, cancellationToken).ConfigureAwait(false);
}
// Would like to use CWT.AddOrUpdate. But that is not available on the
// version of .Net that we're using. So we need to take lock as we're
// making multiple mutations.
lock (s_lastProjectSearchCache)
{
s_lastProjectSearchCache.Remove(project);
s_lastProjectSearchCache.Add(project, Tuple.Create(pattern, searchResults));
}
return(searchResults);
}
// this test ensures that while manipulating keys (through add/remove/lookup
// in the dictionary the overriden GetHashCode(), Equals(), and ==operator do not get invoked.
// Earlier implementation was using these functions virtually so overriding them would result in
// the overridden functions being invoked. But later on Ati changed implementation to use
// Runtime.GetHashCode and Object.ReferenceEquals so this test makes sure that overridden functions never get invoked.
public static void TestOverrides()
{
string[] stringArr = new string[50];
for (int i = 0; i < 50; i++)
{
stringArr[i] = "SomeTestString" + i.ToString();
}
ConditionalWeakTable<string, string> tbl = new ConditionalWeakTable<string, string>();
string str;
for (int i = 0; i < stringArr.Length; i++)
{
tbl.Add(stringArr[i], stringArr[i]);
tbl.TryGetValue(stringArr[i], out str);
tbl.Remove(stringArr[i]);
}
}
public static void Add(int numObjects)
{
// Isolated to ensure we drop all references even in debug builds where lifetime is extended by the JIT to the end of the method
Func<int, Tuple<ConditionalWeakTable<object, object>, WeakReference[], WeakReference[]>> body = count =>
{
object[] keys = Enumerable.Range(0, count).Select(_ => new object()).ToArray();
object[] values = Enumerable.Range(0, count).Select(_ => new object()).ToArray();
var cwt = new ConditionalWeakTable<object, object>();
for (int i = 0; i < count; i++)
{
cwt.Add(keys[i], values[i]);
}
for (int i = 0; i < count; i++)
{
object value;
Assert.True(cwt.TryGetValue(keys[i], out value));
Assert.Same(values[i], value);
Assert.Same(value, cwt.GetOrCreateValue(keys[i]));
Assert.Same(value, cwt.GetValue(keys[i], _ => new object()));
}
return Tuple.Create(cwt, keys.Select(k => new WeakReference(k)).ToArray(), values.Select(v => new WeakReference(v)).ToArray());
};
Tuple<ConditionalWeakTable<object, object>, WeakReference[], WeakReference[]> result = body(numObjects);
GC.Collect();
Assert.NotNull(result.Item1);
for (int i = 0; i < numObjects; i++)
{
Assert.False(result.Item2[i].IsAlive, $"Expected not to find key #{i}");
Assert.False(result.Item3[i].IsAlive, $"Expected not to find value #{i}");
}
}
public static void AddTest()
{
ConditionalWeakTable<object, object> cwt = new ConditionalWeakTable<object, object>();
object key = new object();
object value = new object();
object obj = null;
cwt.Add(key, value);
Assert.True(cwt.TryGetValue(key, out value));
Assert.Equal(value, cwt.GetOrCreateValue(key));
Assert.Equal(value, cwt.GetValue(key , k => new object()));
WeakReference<object> wrValue = new WeakReference<object>(value, false);
WeakReference<object> wrkey = new WeakReference<object>(key, false);
key = null;
value = null;
GC.Collect();
// key and value must be collected
Assert.False(wrValue.TryGetTarget(out obj));
Assert.False(wrkey.TryGetTarget(out obj));
}
/*
* Ensure that a key whose value is referenced outside the dictionary does not get
* automatically removed from the dictionary after GC happens and the key doesn't get gc'd.
*/
public static void TestKeyWithOutsideReferences_Pass1(int length)
{
tbl = new ConditionalWeakTable<string, string>();
weakRefKeyArr = new WeakReference[length];
weakRefValArr = new WeakReference[length];
for (int i = 0; i < length; i++)
{
String key = "OtherKeyTestString" + i.ToString();
String value = "OtherValueTestString" + i.ToString();;
tbl.Add(key, value);
// these assignments should prevent the object from being collected
if (i == 0)
{
key0 = key;
value0 = value;
}
if (i == 21)
{
key21 = key;
value21 = value;
}
if (i == 99)
{
key99 = key;
value99 = value;
}
// create a weak reference for the key
weakRefKeyArr[i] = new WeakReference(key, true);
weakRefValArr[i] = new WeakReference(value, true);
}
}
static void FillStuff (ConditionalWeakTable <object,object> cwt,
out List<object> keepAlive, out List<WeakReference> keys) {
keepAlive = new List<object> ();
keys = new List<WeakReference> ();
object a = new Key ();
object b = new Key ();
object c = new Key ();
cwt.Add (a, new string ("str0".ToCharArray ()));
cwt.Add (b, "str1");
cwt.Add (c, new Link (a));
keepAlive.Add (c);
keys.Add (new WeakReference(a));
keys.Add (new WeakReference(b));
keys.Add (new WeakReference(c));
}
public void TryGetValue () {
var cwt = new ConditionalWeakTable <object,object> ();
object res;
object c = new Key ();
cwt.Add (c, "foo");
try {
cwt.TryGetValue (null, out res);
Assert.Fail ("#0");
} catch (ArgumentNullException) {}
Assert.IsFalse (cwt.TryGetValue ("foo", out res), "#1");
Assert.IsTrue (cwt.TryGetValue (c, out res), "#2");
Assert.AreEqual ("foo", res, "#3");
}
// Create a new test with the given table style and object count.
public TestSet(TableStyle ts, int count)
{
// Use one random number generator for the life of the test. Could support explicit seeds for
// reproducible tests here.
m_rng = new Random();
// Remember our parameters.
m_count = count;
m_style = ts;
// Various arrays.
m_nodes = new Node[count]; // The array of objects
m_collected = new bool[count]; // Records whether each object has been collected (entries are set by
// the finalizer on Node)
m_marks = new bool[count]; // Array used during individual test runs to calculate whether each
// object should still be alive (allocated once here to avoid
// injecting further garbage collections at run time)
// Allocate each object (Node). Each knows its own unique ID (the index into the node array) and has a
// back pointer to this test object (so it can phone home to report its own collection at finalization
// time).
for (int i = 0; i < count; i++)
m_nodes[i] = new Node(this, i);
// Determine how many handles we need to allocate given the number of nodes. This varies based on the
// table style.
switch (ts)
{
case TableStyle.Unconnected:
// Primaries and secondaries are completely different objects so we split our nodes in half and
// allocate that many handles.
m_handleCount = count / 2;
break;
case TableStyle.ForwardLinked:
// Nodes are primaries in one handle and secondary in another except one that falls off the end.
// So we have as many handles as nodes - 1.
m_handleCount = count - 1;
break;
case TableStyle.BackwardLinked:
// Nodes are primaries in one handle and secondary in another except one that falls off the end.
// So we have as many handles as nodes - 1.
m_handleCount = count - 1;
break;
case TableStyle.Random:
// Each node is a primary in some handle (secondaries are selected from amongst all the same nodes
// randomly). So we have as many nodes as handles.
m_handleCount = count;
break;
}
// Allocate an array of HandleSpecs. These aren't the real handles, just structures that allow us
// remember what's in each handle (in terms of the node index number for the primary and secondary).
// We need to track this information separately because we can't access the real handles directly
// (ConditionalWeakTable hides them) and we need to recall exactly what the primary and secondary of
// each handle is so we can compute our own notion of object liveness later.
m_handles = new HandleSpec[m_handleCount];
// Initialize the handle specs to assign objects to handles based on the table style.
for (int i = 0; i < m_handleCount; i++)
{
int primary = -1, secondary = -1;
switch (ts)
{
case TableStyle.Unconnected:
// Assign adjacent nodes to the primary and secondary of each handle.
primary = i * 2;
secondary = (i * 2) + 1;
break;
case TableStyle.ForwardLinked:
// Primary of each handle is the secondary of the last handle.
primary = i;
secondary = i + 1;
break;
case TableStyle.BackwardLinked:
// Primary of each handle is the secondary of the next handle.
primary = i + 1;
secondary = i;
break;
case TableStyle.Random:
// Primary is each node in sequence, secondary is any of the nodes randomly.
primary = i;
secondary = m_rng.Next(m_handleCount);
break;
}
m_handles[i].Set(primary, secondary);
}
// Allocate a ConditionalWeakTable mapping Node keys to Node values.
m_table = new ConditionalWeakTable<Node, Node>();
// Using our handle specs computed above add each primary/secondary node pair to the
// ConditionalWeakTable in turn. This causes the ConditionalWeakTable to allocate a dependent handle
// for each entry with the primary and secondary objects we specified as keys and values (note that
// this scheme prevents us from creating multiple handles with the same primary though if this is
// desired we could achieve it by allocating multiple ConditionalWeakTables).
for (int i = 0; i < m_handleCount; i++)
m_table.Add(m_nodes[m_handles[i].m_primary], m_nodes[m_handles[i].m_secondary]);
}
static List<WeakReference> FillWithNetwork (ConditionalWeakTable <object,object> cwt)
{
const int K = 500;
object[] keys = new object [K];
for (int i = 0; i < K; ++i)
keys[i] = new object ();
Random rand = new Random ();
/*produce a complex enough network of links*/
for (int i = 0; i < K; ++i)
cwt.Add (keys [i], new Link (keys [rand.Next (K)]));
var res = new List<WeakReference> ();
for (int i = 0; i < 10; ++i)
res.Add (new WeakReference (keys [rand.Next (K)]));
Array.Clear (keys, 0, keys.Length);
return res;
}
private static List<InstanceInitializationData> GetListForCurrentRequest(
ConditionalWeakTable<HttpContext, List<InstanceInitializationData>> dictionary)
{
HttpContext currentRequest = HttpContext.Current;
if (currentRequest == null)
{
return new List<InstanceInitializationData>();
}
lock (dictionary)
{
List<InstanceInitializationData> currentRequestInstances;
if (!dictionary.TryGetValue(currentRequest, out currentRequestInstances))
{
dictionary.Add(currentRequest,
currentRequestInstances = new List<InstanceInitializationData>(capacity: 32));
}
return currentRequestInstances;
}
}
public void Add () {
var cwt = new ConditionalWeakTable <object,object> ();
object c = new Key ();
cwt.Add (c, new Link (c));
try {
cwt.Add (c, new Link (c));
Assert.Fail ("#0");
} catch (ArgumentException) {}
cwt.Add ("zzz", null);//ok
try {
cwt.Add (null, new Link (c));
Assert.Fail ("#1");
} catch (ArgumentNullException) {}
}
public void InsertStress () {
if (GC.MaxGeneration == 0) /*Boehm doesn't handle ephemerons */
Assert.Ignore ("Not working on Boehm.");
var cwt = new ConditionalWeakTable <object,object> ();
var a = new object ();
var b = new object ();
cwt.Add (a, new object ());
cwt.Add (b, new object ());
List<WeakReference> res = null;
ThreadStart dele = () => { res = FillWithNetwork (cwt); };
var th = new Thread(dele);
th.Start ();
th.Join ();
GC.Collect ();
GC.Collect ();
for (int i = 0; i < res.Count; ++i)
Assert.IsFalse (res [i].IsAlive, "#r" + i);
}
public static void Clear_AllValuesRemoved(int numObjects)
{
var cwt = new ConditionalWeakTable<object, object>();
MethodInfo clear = cwt.GetType().GetMethod("Clear", BindingFlags.NonPublic | BindingFlags.Instance);
if (clear == null)
{
// Couldn't access the Clear method; skip the test.
return;
}
object[] keys = Enumerable.Range(0, numObjects).Select(_ => new object()).ToArray();
object[] values = Enumerable.Range(0, numObjects).Select(_ => new object()).ToArray();
for (int iter = 0; iter < 2; iter++)
{
// Add the objects
for (int i = 0; i < numObjects; i++)
{
cwt.Add(keys[i], values[i]);
Assert.Same(values[i], cwt.GetValue(keys[i], _ => new object()));
}
// Clear the table
clear.Invoke(cwt, null);
// Verify the objects are removed
for (int i = 0; i < numObjects; i++)
{
object ignored;
Assert.False(cwt.TryGetValue(keys[i], out ignored));
}
// Do it a couple of times, to make sure the table is still usable after a clear.
}
}
static List<GCHandle> FillTable3 (ConditionalWeakTable <object,object> cwt) {
var handles = new List<GCHandle> ();
var a = (object)10;
var b = (object)20;
var k1 = (object)30;
var k2 = (object)40;
handles.Add (GCHandle.Alloc (a, GCHandleType.Pinned));
handles.Add (GCHandle.Alloc (b, GCHandleType.Pinned));
handles.Add (GCHandle.Alloc (k1, GCHandleType.Pinned));
handles.Add (GCHandle.Alloc (k2, GCHandleType.Pinned));
cwt.Add (a, k1);
cwt.Add (b, k2);
return handles;
}
public void OldGenKeysMakeNewGenObjectsReachable ()
{
if (GC.MaxGeneration == 0) /*Boehm doesn't handle ephemerons */
Assert.Ignore ("Not working on Boehm.");
ConditionalWeakTable<object, Val> table = new ConditionalWeakTable<object, Val>();
List<Key> keys = new List<Key>();
//
// This list references all keys for the duration of the program, so none
// should be collected ever.
//
for (int x = 0; x < 1000; x++)
keys.Add (new Key () { Foo = x });
for (int i = 0; i < 1000; ++i) {
// Insert all keys into the ConditionalWeakTable
foreach (var key in keys)
table.Add (key, new Val () { Foo = key.Foo });
// Look up all keys to verify that they are still there
Val val;
foreach (var key in keys)
Assert.IsTrue (table.TryGetValue (key, out val), "#1-" + i + "-k-" + key);
// Remove all keys from the ConditionalWeakTable
foreach (var key in keys)
Assert.IsTrue (table.Remove (key), "#2-" + i + "-k-" + key);
}
}
static void FillWithFinalizable (ConditionalWeakTable <object,object> cwt)
{
object a = new object ();
object b = new FinalizableLink (0, a, cwt);
cwt.Add (a, "foo");
cwt.Add (b, "bar");
for (int i = 1; i < 20; ++i) {
b = new FinalizableLink (i, b, cwt);
cwt.Add (b, i);
}
}
public static void Concurrent_AddMany_DropReferences() // no asserts, just making nothing throws
{
var cwt = new ConditionalWeakTable<object, object>();
for (int i = 0; i < 10000; i++)
{
cwt.Add(i.ToString(), i.ToString());
if (i % 1000 == 0) GC.Collect();
}
}
internal static EventHandler<object> GetValueFromEquivalentKey(
ConditionalWeakTable<EventHandler, EventHandler<object>> table,
EventHandler key,
ConditionalWeakTable<EventHandler, EventHandler<object>>.CreateValueCallback callback)
{
EventHandler<object> value;
// Find the key in the table using a value check rather than an instance check.
EventHandler existingKey = table.FindEquivalentKeyUnsafe(key, out value);
if (existingKey == null)
{
value = callback(key);
table.Add(key, value);
}
return value;
}
public static void Concurrent_Add_Read_Remove_DifferentObjects()
{
var cwt = new ConditionalWeakTable<object, object>();
DateTime end = DateTime.UtcNow + TimeSpan.FromSeconds(0.25);
Parallel.For(0, Environment.ProcessorCount, i =>
{
while (DateTime.UtcNow < end)
{
object key = new object();
object value = new object();
cwt.Add(key, value);
Assert.Same(value, cwt.GetValue(key, _ => new object()));
Assert.True(cwt.Remove(key));
Assert.False(cwt.Remove(key));
}
});
}
// add the handler to the CWT - this keeps the handler alive throughout
// the lifetime of the target, without prolonging the lifetime of
// the target
void AddHandlerToCWT(Delegate handler, ConditionalWeakTable<object, object> cwt)
{
object value;
object target = handler.Target;
if (target == null)
target = StaticSource;
if (!cwt.TryGetValue(target, out value))
{
// 99% case - the target only listens once
cwt.Add(target, handler);
}
else
{
// 1% case - the target listens multiple times
// we store the delegates in a list
List<Delegate> list = value as List<Delegate>;
if (list == null)
{
// lazily allocate the list, and add the old handler
Delegate oldHandler = value as Delegate;
list = new List<Delegate>();
list.Add(oldHandler);
// install the list as the CWT value
cwt.Remove(target);
cwt.Add(target, list);
}
// add the new handler to the list
list.Add(handler);
}
}
public static void AddRemove_DropValue()
{
var key = new object();
var value = new object();
var cwt = new ConditionalWeakTable<object, object>();
cwt.Add(key, value);
cwt.Remove(key);
// Verify that the removed entry is not keeping the value alive
var wrValue = new WeakReference(value);
value = null;
GC.Collect();
Assert.False(wrValue.IsAlive);
GC.KeepAlive(cwt);
GC.KeepAlive(key);
}
public void InsertStress () {
var cwt = new ConditionalWeakTable <object,object> ();
var a = new object ();
var b = new object ();
cwt.Add (a, new object ());
cwt.Add (b, new object ());
List<WeakReference> res = null;
ThreadStart dele = () => { res = FillWithNetwork (cwt); };
var th = new Thread(dele);
th.Start ();
th.Join ();
GC.Collect ();
GC.Collect ();
for (int i = 0; i < res.Count; ++i)
Assert.IsFalse (res [i].IsAlive, "#r" + i);
}
public void InsertStress () {
if (GC.MaxGeneration == 0) /*Boehm doesn't handle ephemerons */
Assert.Ignore ("Not working on Boehm.");
var cwt = new ConditionalWeakTable <object,object> ();
var a = new object ();
var b = new object ();
cwt.Add (a, new object ());
cwt.Add (b, new object ());
List<WeakReference> res = null;
FinalizerHelpers.PerformNoPinAction (() => { res = FillWithNetwork (cwt); });
GC.Collect ();
GC.Collect ();
for (int i = 0; i < res.Count; ++i)
Assert.IsFalse (res [i].IsAlive, "#r" + i);
}
public void Remove () {
var cwt = new ConditionalWeakTable <object,object> ();
object c = new Key ();
cwt.Add (c, "x");
try {
cwt.Remove (null);
Assert.Fail ("#0");
} catch (ArgumentNullException) {}
Assert.IsFalse (cwt.Remove ("x"), "#1");
Assert.IsTrue (cwt.Remove (c), "#2");
Assert.IsFalse (cwt.Remove (c), "#3");
}
