Enterprise Caching

Evgen NapryagloIntetics Inc

e.Napryaglo@intetics.com

Data access latency

Register L1 L2 L3 RAM SSD HDD0

200

400

600

800

1000

1200Latency

Latency

Common caching scenarios

• Static content delivery• Increase database IO bandwidth• Slow API integration

Caching Practices

• InProc data caching• Dedicated cache service• Static content cache• Distributed cache

Distributed Cache topologies

Alachisoft

Aspects oriented programming

Programming paradigm that aims to increase modularity by allowing the separation of cross-cutting concerns. It does so by adding additional behavior to existing code without modifying the code itself

Concern areas• Security• Logging• Metrics profiling• Dependency Injection• Caching

AOP in common IoC frameworks

Application Proxy Service

public interface IInterceptor

void Intercept(IInvocation invocation);

bool CanIntercept(IInvocation invocation);

public interface IInvocation

MethodInfo Method { get; set; }

object Target { get; set; }

object Result { get; set; }

Service definition with a cache support[Cache]

public interface ISomeThirdPartyDataProvider

{

[Cache(CacheScope.Session, Timeout=200, Key=“SD”)]

UserSubscriptionDetails [] GetSubscriptions(User u);

[Cache(CacheScope.Global, Timeout = -1)]

AreaLocationDetails [] GetLocationDetails([Key] Area a);

[Cache(CacheScope.Session, Key=“userProducts”,

Invalidate = typeof(AvailableProductsInvalidationStrategy))]

Product [] GetAvailableProducts ()

}

Caching interceptor internalssealed class CacheInterceptor : IInterceptor

{

public void Intercept(IInvocation invocation)

{

var cacheOptions = invocation.Method.GetAttribute();

var cache = IoC.Resolve<ICache>();

if (!cache.TryGetValue(cacheOptions.CacheKey, out value))

invocation.Result = cache[cacheOptions] = invocation.Proceed();

else

invocation.Result = value;

}

}

Pros & cons

• Strict separation of concern• Clean application code• Nonfunctional design specification inside a

declaration• Focus on features instead of infrastructure

• Increasing project learning curve• Little flexibility with a cached data invalidation

THANK YOU