internal static void DisposeLinkingScope()
{
var currentLink = ContextLink;
var priorLink = ((EntryLink)currentLink).Parent;
ContextLink = priorLink;
}
internal static IEntryLink CreateLinkingScope()
{
var parentLink = ContextLink;
var newLink = new EntryLink(parent: parentLink);
ContextLink = newLink;
return newLink;
}
internal static IEntryLink CreateLinkingScope()
{
var parentLink = ContextLink;
var newLink = new EntryLink(parent: parentLink);
ContextLink = newLink;
return(newLink);
}
public void UpdateCacheEntryOptions_CopiesTriggersFromEntryLink()
{
// Arrange
var expiresSliding = TimeSpan.FromSeconds(30);
var expected = new[] { Mock.Of<IExpirationTrigger>(), Mock.Of<IExpirationTrigger>() };
var cache = new MemoryCache(new MemoryCacheOptions());
var cacheTagHelper = new CacheTagHelper(cache)
{
ExpiresSliding = expiresSliding
};
var entryLink = new EntryLink();
entryLink.AddExpirationTriggers(expected);
// Act
var cacheEntryOptions = cacheTagHelper.GetMemoryCacheEntryOptions(entryLink);
// Assert
Assert.Equal(expected, cacheEntryOptions.Triggers.ToArray());
}
public void UpdateCacheEntryOptions_PrefersAbsoluteExpirationSpecifiedOnEntryLinkOverExpiresOn()
{
// Arrange
var expiresOn1 = DateTimeOffset.UtcNow.AddDays(12);
var expiresOn2 = DateTimeOffset.UtcNow.AddMinutes(4);
var cache = new MemoryCache(new MemoryCacheOptions());
var cacheTagHelper = new CacheTagHelper(cache)
{
ExpiresOn = expiresOn1
};
var entryLink = new EntryLink();
entryLink.SetAbsoluteExpiration(expiresOn2);
// Act
var cacheEntryOptions = cacheTagHelper.GetMemoryCacheEntryOptions(entryLink);
// Assert
Assert.Equal(expiresOn2, cacheEntryOptions.AbsoluteExpiration);
}
public void UpdateCacheEntryOptions_UsesAbsoluteExpirationSpecifiedOnEntryLink()
{
// Arrange
var expiresOn = DateTimeOffset.UtcNow.AddMinutes(7);
var cache = new MemoryCache(new MemoryCacheOptions());
var cacheTagHelper = new CacheTagHelper(cache)
{
};
var entryLink = new EntryLink();
entryLink.SetAbsoluteExpiration(expiresOn);
// Act
var cacheEntryOptions = cacheTagHelper.GetMemoryCacheEntryOptions(entryLink);
// Assert
Assert.Equal(expiresOn, cacheEntryOptions.AbsoluteExpiration);
}
internal static void DisposeLinkingScope()
{
var currentLink = ContextLink;
var priorLink = ((EntryLink)currentLink).Parent;
ContextLink = priorLink;
}
public EntryLink(EntryLink parent)
{
Parent = parent;
}
public void UpdateCacheContext_CopiesTriggersFromEntryLink()
{
// Arrange
var expiresSliding = TimeSpan.FromSeconds(30);
var expected = new[] { Mock.Of<IExpirationTrigger>(), Mock.Of<IExpirationTrigger>() };
var triggers = new List<IExpirationTrigger>();
var cache = new MemoryCache(new MemoryCacheOptions());
var cacheContext = new Mock<ICacheSetContext>();
cacheContext.Setup(c => c.SetSlidingExpiration(expiresSliding))
.Verifiable();
cacheContext.Setup(c => c.AddExpirationTrigger(It.IsAny<IExpirationTrigger>()))
.Callback<IExpirationTrigger>(triggers.Add)
.Verifiable();
var cacheTagHelper = new CacheTagHelper
{
MemoryCache = cache,
ExpiresSliding = expiresSliding
};
var entryLink = new EntryLink();
entryLink.AddExpirationTriggers(expected);
// Act
cacheTagHelper.UpdateCacheContext(cacheContext.Object, entryLink);
// Assert
cacheContext.Verify();
Assert.Equal(expected, triggers);
}
public EntryLink(EntryLink parent)
{
Parent = parent;
}
public void UpdateCacheContext_PrefersAbsoluteExpirationSpecifiedOnEntryLinkOverExpiresOn()
{
// Arrange
var expiresOn1 = DateTimeOffset.UtcNow.AddDays(12);
var expiresOn2 = DateTimeOffset.UtcNow.AddMinutes(4);
var cache = new MemoryCache(new MemoryCacheOptions());
var cacheContext = new Mock<ICacheSetContext>();
var sequence = new MockSequence();
cacheContext.InSequence(sequence)
.Setup(c => c.SetAbsoluteExpiration(expiresOn1))
.Verifiable();
cacheContext.InSequence(sequence)
.Setup(c => c.SetAbsoluteExpiration(expiresOn2))
.Verifiable();
var cacheTagHelper = new CacheTagHelper
{
MemoryCache = cache,
ExpiresOn = expiresOn1
};
var entryLink = new EntryLink();
entryLink.SetAbsoluteExpiration(expiresOn2);
// Act
cacheTagHelper.UpdateCacheContext(cacheContext.Object, entryLink);
// Assert
cacheContext.Verify();
}
public void UpdateCacheContext_UsesAbsoluteExpirationSpecifiedOnEntryLink()
{
// Arrange
var expiresOn = DateTimeOffset.UtcNow.AddMinutes(7);
var cache = new MemoryCache(new MemoryCacheOptions());
var cacheContext = new Mock<ICacheSetContext>(MockBehavior.Strict);
cacheContext.Setup(c => c.SetAbsoluteExpiration(expiresOn))
.Verifiable();
var cacheTagHelper = new CacheTagHelper
{
MemoryCache = cache
};
var entryLink = new EntryLink();
entryLink.SetAbsoluteExpiration(expiresOn);
// Act
cacheTagHelper.UpdateCacheContext(cacheContext.Object, entryLink);
// Assert
cacheContext.Verify();
}
// Internal for unit testing
internal void UpdateCacheContext(ICacheSetContext cacheSetContext, EntryLink entryLink)
{
if (ExpiresOn != null)
{
cacheSetContext.SetAbsoluteExpiration(ExpiresOn.Value);
}
if (ExpiresAfter != null)
{
cacheSetContext.SetAbsoluteExpiration(ExpiresAfter.Value);
}
if (ExpiresSliding != null)
{
cacheSetContext.SetSlidingExpiration(ExpiresSliding.Value);
}
if (Priority != null)
{
cacheSetContext.SetPriority(Priority.Value);
}
cacheSetContext.AddEntryLink(entryLink);
}
/// <inheritdoc />
public override async Task ProcessAsync(TagHelperContext context, TagHelperOutput output)
{
var key = GenerateKey(context);
TagHelperContent result;
if (!MemoryCache.TryGetValue(key, out result))
{
// Create an EntryLink and flow it so that it is accessible via the ambient EntryLinkHelpers.ContentLink
// for user code.
var entryLink = new EntryLink();
using (entryLink.FlowContext())
{
result = await context.GetChildContentAsync();
}
MemoryCache.Set(key, cacheSetContext =>
{
UpdateCacheContext(cacheSetContext, entryLink);
return result;
});
}
// Clear the contents of the "cache" element since we don't want to render it.
output.SuppressOutput();
output.Content.SetContent(result);
}
public void Main()
{
IMemoryCache cache = new MemoryCache(new MemoryCacheOptions());
object result;
string key = "Key";
object newObject = new object();
object state = new object();
// Basic CRUD operations:
// Create / Overwrite
result = cache.Set(key, newObject);
result = cache.Set(key, context => new object());
result = cache.Set(key, state, context => new object());
// Retrieve, null if not found
result = cache.Get(key);
// Retrieve
bool found = cache.TryGetValue(key, out result);
// Delete
cache.Remove(key);
// Conditional operations:
// Retrieve / Create when we want to lazily create the object.
result = cache.GetOrSet(key, context => new object());
// Retrieve / Create when we want to lazily create the object.
result = cache.GetOrSet(key, state, context => new object());
// Cache entry configuration:
// Stays in the cache as long as possible
result = cache.GetOrSet(key, state, context =>
{
context.SetPriority(CachePreservationPriority.NeverRemove);
return new object();
});
// Automatically remove if not accessed in the given time
result = cache.GetOrSet(key, state, context =>
{
context.SetSlidingExpiration(TimeSpan.FromMinutes(5));
return new object();
});
// Automatically remove at a certain time
result = cache.GetOrSet(key, state, context =>
{
context.SetAbsoluteExpiration(new DateTime(2014, 12, 31));
// or relative:
// context.SetAbsoluteExpiration(TimeSpan.FromMinutes(5));
return new object();
});
// Automatically remove if not accessed in the given time
// Automatically remove at a certain time (if it lives that long)
result = cache.GetOrSet(key, state, context =>
{
context.SetSlidingExpiration(TimeSpan.FromMinutes(5));
context.SetAbsoluteExpiration(new DateTime(2014, 12, 31));
// or relative:
// context.SetAbsoluteExpiration(TimeSpan.FromMinutes(5));
return new object();
});
// Callback when evicted
result = cache.GetOrSet(key, state, context =>
{
context.RegisterPostEvictionCallback((echoKey, value, reason, substate) =>
Console.WriteLine(echoKey + ": '" + value + "' was evicted due to " + reason), state: null);
return new object();
});
// Remove on trigger
var cts = new CancellationTokenSource();
result = cache.GetOrSet(key, state, context =>
{
context.AddExpirationTrigger(new CancellationTokenTrigger(cts.Token));
return new object();
});
result = cache.GetOrSet(key, context =>
{
var link = new EntryLink();
var inner1 = cache.GetOrSet("subkey1", link, subContext =>
{
return "SubValue1";
});
string inner2;
using (link.FlowContext())
{
inner2 = cache.GetOrSet("subkey2", subContext =>
{
return "SubValue2";
});
}
context.AddEntryLink(link);
return inner1 + inner2;
});
}
