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Show / Hide Table of Contents
  • Programmer's Guide
  • Client Side API Programming
    • Setting Up Development Environment
    • Basic Cache Operations
      • Initialize Cache
      • Add Data to Cache
      • Update Data in Cache
      • Fetch Data From Cache
      • Remove Data From Cache
      • Dispose Cache
    • Bulk Operations
      • Adding Collection to Cache
      • Updating Collection in Cache
      • Retrieving Collection from Cache
      • Removing Collection from Cache
      • Deleting Collection from Cache
    • Asynchronous Operations
      • Using Asynchronous Operations
      • Using Asynchronous Operations with Callback Methods
    • Groups and Subgroups
      • Adding/Updating Data Group in Cache
      • Retrieving Data Group from Cache
      • Removing Data Group from Cache
    • Tagging Data in NCache
      • Creating Tags
      • Adding Items with Tags
      • Retrieving Previously Tagged Data
      • Removing Tagged Items from Cache
    • Named Tags
    • Data Expiration Strategies
      • Using Absolute Expiration
      • Using Sliding Expiration
    • Cache Dependencies
      • Key Dependency
      • File Dependency
      • Notification based Dependencies
        • Database Dependency using SQL Server
        • Database Dependency using Oracle
      • Polling Based Dependency
      • Custom Data Source Dependency
      • Multiple Cache Sync Dependency
      • Aggregate Dependency
      • Add Dependency to Existing Item
      • Using CLR Procedures to Call NCache
    • Locking Data in NCache
      • Locking Items in Cache (Pessimistic Locking)
      • Locking Items with Cache Item Versioning (Optimistic Locking)
    • SQL Reference for NCache
      • SQL Syntax
      • Querying Samples for Operators
      • Querying Data in NCache
      • NCache Language Integrated Query (LINQ)
        • Using LINQ in NCache
        • Configuring LINQPad for NCache
        • Querying NCache Data in LINQPad
    • Event Notifications
      • Cache Level Event Notifications
      • Item Level Event Notifications
      • Custom Event Notifications
    • Publish/Subscribe (Pub/Sub) in NCache
      • Pub/Sub Topics
      • Managing Topics
      • Pub/Sub Messages
        • Message Behavior and Properties
        • Creating a Message
      • Publish Messages to Topic
      • Subscribe for Topic Messages
      • Monitoring Pub/Sub Topics
    • Continuous Query
    • Using Streams in NCache
      • Opening with Stream Modes
      • Adding and Updating Data with Streams
      • Retrieving Data from Streams
      • Closing a Stream
    • Security and Encryption
      • NCache Security
      • NCache Data Encryption
    • Data Compression
    • NCache Management API
  • Server Side API Programming
    • Cache Startup Loader
      • Components of Cache Startup Loader
      • Sample Implementation of ICacheLoader on Single Node
      • Sample Implementation of ICacheLoader with Distribution Hints
    • Data Source Providers (Backing Source)
      • Read-Through Caching
        • Configure Read-Through Provider
        • Using Read-Through with Cache Operations
      • Write-Through Caching
        • Configuring Write-Through Provider
        • Using Write-Through with Basic Operations
        • Using Write-Behind with Basic Operations
        • Using Write-Behind with Bulk Operations
        • Using Write-Behind with Async Operations
        • Monitor Write-Through Counters
    • Custom Dependency
      • Sample Implementation of Custom Dependency
      • Sample Usage of Custom Dependency
    • WAN Replication through Bridge
      • Bridge Configurations
      • Implementing Bridge Conflict Resolver
    • Entry Processor
      • Sample Implementation of IEntryProcessor Interface
      • Sample Usage of EntryProcessor
    • MapReduce
      • Sample Implementation of MapReduce Interfaces
      • Sample Usage of MapReduce
    • Aggregator
      • Sample Implementation of IValueExtractor Interface
      • Sample Implementation of IAggregator Interface
      • Sample Usage of Aggregator
    • Dynamic Compact Serialization
  • Client Side ASP.NET Features
    • ASP.NET
      • ASP.NET Session State Provider for NCache
      • Multi-Region ASP.NET Session State Provider for NCache
    • ASP.NET Core
      • Session Storage in ASP.NET Core
        • Configure NCache ASP.NET Core Session Provider
        • Configure ASP.NET Core Sessions with NCache IDistributedCache Provider
      • Multi-Region ASP.NET Core Session Provider for NCache
      • Object Caching in ASP.NET Core
    • ASP.NET SignalR
      • Using NCache Extension for SignalR
    • View State Caching
      • Configuring and Using Content Optimization
      • Group View State with Sessions
      • Limit View State Caching
      • Perform Page Level Grouping for View State
    • ASP.NET Output Cache
      • Configure ASP.NET Output Caching
      • Using ASP.NET Output Cache with Custom Hooks
  • Client Side Third Party Integrations
    • Migrating AppFabric to NCache
      • AppFabric API vs. NCache API
    • NHibernate
      • NCache as NHibernate Second Level Cache
      • Using NHibernate Query Caching
      • Configuring Database Synchronization with NHibernate
    • Entity Framework Caching Integration
      • NCache as Entity Framework Second Level Cache
      • Entity Framework Caching Config File
    • Entity Framework Core Caching
      • Installing NCache Entity Framework Core Provider
      • Configuring NCache Entity Framework Core Provider
      • Using NCache Entity Framework Core Provider
        • Caching Options for EF Core Provider
        • LINQ APIs for EF Core Provider
        • Cache Only APIs for EF Core Provider
        • Query Deferred APIs for EF Core Provider
      • Logging in NCache Entity Framework Core Provider
    • Memcached
      • NCache Memcached Gateway Approach
      • Memcached Client Plugin for .NET
    • Debug NCache Providers in Visual Studio
    • NCache for Visual Studio Extension

Using Read-Through with Cache Operations

This section will explain the use of Read-Through provider after configuring and deploying it. NCache supports multiple Read-Through providers with an application.

NCache provides Alachisoft.NCache.Web.Caching.DSReadOption enum to specify Read thru option in APIs.

Multiple Read-Through providers can be configured through NCache. Default Read-Through provider will be called if specific provider name is not mentioned through API. You can also use providers other than default by using provider specific overloads of APIs.

To utilize the APIs, include the following namespace in your application:

  • Alachisoft.NCache.Runtime.DatasourceProviders
  • Alachisoft.NCache.Web.Caching
  • Alachisoft.NCache.Runtime

Using Get Method

Member Description
Get(string key, DSReadOption dsReadOption) Gets item from cache and uses default provider
Get(string key, string providerName, DSReadOption dsReadOption) Gets item from cache and uses specified provider
Product product=null;
try
{
  string key = "Product:1001";
  object data = cache.Get(key, DSReadOption.ReadThru);

  if (data != null)
  {
   product = (Product)data;
  }
}
catch (OperationFailedException exp) {
  //handle exception
}

Using Read-Through with Bulk Operations

For better understanding of the these operations review Bulk Operations.

Member Description
IDictionary GetBulk(string[] keys, DSReadOption dsReadOption) Gets bulk items from cache and uses default provider
IDictionary GetBulk(string[] keys, string providerName, DSReadOption dsReadOption) Gets bulk items from cache and uses specified provider
try
{
   String[] keys = { "Product:1001", "Product:1002",
   "Product:1003","Product:1004"};

   IDictionary resultSet = cache.GetBulk(keys, DSReadOption.ReadThru);

   //IDictionary contains cached keys and values
}
catch (OperationFailedException exp)
{
  //handle exception
}

Using Read-Through with CacheItem

For this scenario, use the following API.

Member Description
CacheItem GetCacheItem(string key DSReadOption dsReadOption) Gets CacheItem from cache and uses default provider
GetCacheItem(string key, string providerName, DSReadOption dsReadOption) Gets CacheItem from cache and uses specified provider
string key = "Product:1001";
Product product=null;
try
{
   CacheItem data = cache.GetCacheItem(key, DSReadOption.ReadThru);

   if (data!= null)
   {
     product = (Product)data.Value;
   }
}
catch (Exception exp)
{
  //handle exception
}

You can specify the default provider through NCache Manager or through client.ncconf file placed in the config folder of the NCache installation directory. If the provider name is not provided in both the API and client.ncconf, the default provider will automatically be used.

<cacheid="mycache" default-readthru-provider="defaultProviderName" client-cache-id="" client-cache-syncmode="optimistic" default-writethru-provider="" load-balance="True">
  ...
</cache>

CacheInitParams can also be used to specify providers. NCache logs errors/exceptions in cache logs in case of an exception during loading the provided assemblies.

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