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0

I have a cache provider:

public static class CacheAsideHelper
 
public static T GetOrAdd<T>(Func<T> builder, TimeSpan expiresIn, bool ignoreNullValues, params string[] keys)
 
 var key = GetKey(keys);
 CacheItemWrapper itemWrapper = null;
 var cachedItem = MemoryCache.Default.Get(key);
 if (cachedItem != null)
 
 itemWrapper = (CacheItemWrapper)cachedItem;
 

 if (itemWrapper != null && !(DateTime.Now.Subtract(itemWrapper.InsertedAt).TotalSeconds >=
 expiresIn.TotalSeconds))
 
 return (T)itemWrapper.Item;
 

 ////expired or not in cache
 var item = builder();
 if (item == null && ignoreNullValues)
 
 return default(T);
 

 var wrapper = new CacheItemWrapper
 
 InsertedAt = DateTime.Now,
 Item = item
 ;
 MemoryCache.Default.Add(key, wrapper, DateTime.Now.Add(expiresIn));
 return item;
 

This is the calling example:

return (CacheAsideHelper.GetOrAdd(
 () => GetSchema(connectionString, tableName),
 new TimeSpan(Consts.MemoryCacheExchangeRateExpirationHours, 0, 0), true, tableName)).ToList();

What I realised is that the GetSchema function is always called no matter the data is in cache or not.

So I stepped the code and turned out this is what happened:

1. 
   

   The code will hit this line and return the item in cache:

   
   
   

   return (T)itemWrapper.Item;

   
   



2. After that, it also hit the GetSchema function.

So looks like there is a bug in my CachAside routine, however, I can't see anything wrong with my code.

c#

share|improve this question

asked Mar 22 at 16:32

daxudaxu

84321234

add a comment | 

0

I have a cache provider:

public static class CacheAsideHelper
 
public static T GetOrAdd<T>(Func<T> builder, TimeSpan expiresIn, bool ignoreNullValues, params string[] keys)
 
 var key = GetKey(keys);
 CacheItemWrapper itemWrapper = null;
 var cachedItem = MemoryCache.Default.Get(key);
 if (cachedItem != null)
 
 itemWrapper = (CacheItemWrapper)cachedItem;
 

 if (itemWrapper != null && !(DateTime.Now.Subtract(itemWrapper.InsertedAt).TotalSeconds >=
 expiresIn.TotalSeconds))
 
 return (T)itemWrapper.Item;
 

 ////expired or not in cache
 var item = builder();
 if (item == null && ignoreNullValues)
 
 return default(T);
 

 var wrapper = new CacheItemWrapper
 
 InsertedAt = DateTime.Now,
 Item = item
 ;
 MemoryCache.Default.Add(key, wrapper, DateTime.Now.Add(expiresIn));
 return item;
 

This is the calling example:

return (CacheAsideHelper.GetOrAdd(
 () => GetSchema(connectionString, tableName),
 new TimeSpan(Consts.MemoryCacheExchangeRateExpirationHours, 0, 0), true, tableName)).ToList();

What I realised is that the GetSchema function is always called no matter the data is in cache or not.

So I stepped the code and turned out this is what happened:

1. 
   

   The code will hit this line and return the item in cache:

   
   
   

   return (T)itemWrapper.Item;

   
   



2. After that, it also hit the GetSchema function.

So looks like there is a bug in my CachAside routine, however, I can't see anything wrong with my code.

c#

share|improve this question

asked Mar 22 at 16:32

daxudaxu

84321234

add a comment | 

I have a cache provider:

public static class CacheAsideHelper
 
public static T GetOrAdd<T>(Func<T> builder, TimeSpan expiresIn, bool ignoreNullValues, params string[] keys)
 
 var key = GetKey(keys);
 CacheItemWrapper itemWrapper = null;
 var cachedItem = MemoryCache.Default.Get(key);
 if (cachedItem != null)
 
 itemWrapper = (CacheItemWrapper)cachedItem;
 

 if (itemWrapper != null && !(DateTime.Now.Subtract(itemWrapper.InsertedAt).TotalSeconds >=
 expiresIn.TotalSeconds))
 
 return (T)itemWrapper.Item;
 

 ////expired or not in cache
 var item = builder();
 if (item == null && ignoreNullValues)
 
 return default(T);
 

 var wrapper = new CacheItemWrapper
 
 InsertedAt = DateTime.Now,
 Item = item
 ;
 MemoryCache.Default.Add(key, wrapper, DateTime.Now.Add(expiresIn));
 return item;
 

This is the calling example:

return (CacheAsideHelper.GetOrAdd(
 () => GetSchema(connectionString, tableName),
 new TimeSpan(Consts.MemoryCacheExchangeRateExpirationHours, 0, 0), true, tableName)).ToList();

What I realised is that the GetSchema function is always called no matter the data is in cache or not.

So I stepped the code and turned out this is what happened:

1. 
   

   The code will hit this line and return the item in cache:

   
   
   

   return (T)itemWrapper.Item;

   
   



2. After that, it also hit the GetSchema function.

So looks like there is a bug in my CachAside routine, however, I can't see anything wrong with my code.

c#

share|improve this question

asked Mar 22 at 16:32

daxudaxu

84321234

public static class CacheAsideHelper
 
public static T GetOrAdd<T>(Func<T> builder, TimeSpan expiresIn, bool ignoreNullValues, params string[] keys)
 
 var key = GetKey(keys);
 CacheItemWrapper itemWrapper = null;
 var cachedItem = MemoryCache.Default.Get(key);
 if (cachedItem != null)
 
 itemWrapper = (CacheItemWrapper)cachedItem;
 

 if (itemWrapper != null && !(DateTime.Now.Subtract(itemWrapper.InsertedAt).TotalSeconds >=
 expiresIn.TotalSeconds))
 
 return (T)itemWrapper.Item;
 

 ////expired or not in cache
 var item = builder();
 if (item == null && ignoreNullValues)
 
 return default(T);
 

 var wrapper = new CacheItemWrapper
 
 InsertedAt = DateTime.Now,
 Item = item
 ;
 MemoryCache.Default.Add(key, wrapper, DateTime.Now.Add(expiresIn));
 return item;
 

return (CacheAsideHelper.GetOrAdd(
 () => GetSchema(connectionString, tableName),
 new TimeSpan(Consts.MemoryCacheExchangeRateExpirationHours, 0, 0), true, tableName)).ToList();

share|improve this question

asked Mar 22 at 16:32

daxudaxu

84321234

share|improve this question

asked Mar 22 at 16:32

daxudaxu

84321234

asked Mar 22 at 16:32

daxudaxu

84321234

asked Mar 22 at 16:32

daxudaxu

84321234