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  • Programmer's Guide
  • Setting Up Development Environment
    • .NET
      • Client API Prerequisites
      • Server-side API Prerequisites
    • Java
      • Client API Prerequisites
      • Server-side API Prerequisites
    • Python
      • Client API Prerequisites
    • Node.js
      • Client API Prerequisites
  • Client Side API Programming
    • Error Handling
    • Troubleshooting
    • Cache Keys and Data
    • How to Connect to Cache
    • Basic Operations - An Overview
      • Add Data
      • Update/Insert Data
      • Retrieve Data
      • Remove Data
    • Groups
      • Overview
      • Add/Update Data with Groups
      • Retrieve Data with Groups
      • Remove Data with Group
      • Search Group Data Using SQL
      • Delete Group Data Using SQL
    • Tags
      • Overview
      • Add/Update Data with Tags
      • Retrieve Data with Tags
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      • Search Tag Data Using SQL
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    • Named Tags
      • Overview
      • Add/Update Data with Named Tags
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      • Search Data with Named Tags Using SQL
      • Delete Data with Named Tags Using SQL
    • Expirations
      • Overview
      • Absolute Expiration
      • Sliding Expiration
    • Data Dependency
      • Key Dependency
      • Multi-Cache Dependency
    • Dependency on Database
      • SQL Server
      • Oracle
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      • CLR Procedures in SQL Server
    • Dependency on External Source
      • File Dependency
      • Custom Dependency
      • Aggregate Dependency
    • Locks
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      • Optimistic Locking
    • SQL Query
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      • SQL Reference
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      • LINQ Reference
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    • Events
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      • Item Level Events
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    • Security API
      • Login with Credentials
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    • Error Logging
    • Location Affinity
  • Server-side API Programming
    • Loader and Refresher
      • Overview
      • Implement Loader and Refresher
      • Components of Loader/Refresher
    • Data Source Providers
      • Read-through
        • Implement Read-through
        • Use Read-through
      • Write-through
        • Implement Write-through
        • Use Write-through
        • Use Write-behind
    • Custom Dependency
      • Implement Extensible Dependency
      • Implement Bulk Extensible Dependency
      • Implement Notify Extensible Dependency
    • Bridge Conflict Resolver
    • Entry Processor
      • Overview
      • Implement Entry Processor
    • MapReduce
      • Overview
      • Implement MapReduce
      • Use MapReduce
    • MapReduce Aggregator
      • Overview
      • Implement and Use Aggregator
    • Compact Serialization
  • Client Side Features
    • ASP.NET Core Caching
      • Session Storage
        • Session Provider
        • IDistributedCache
        • Sessions Usage
        • Multi-site Session Provider
        • Session Sharing with ASP.NET
      • SignalR
        • NCache Extension for SignalR Core
      • Response Caching
        • Configure and Use
        • Configure with IDistributedCache
      • Data Caching
        • NCache API
        • IDistributedCache API
      • Data Protection Provider
        • Configure
    • Java Web App Caching
      • Web Sessions
        • Overview
        • Configure App
          • Add Maven Dependencies
          • Deploy Application
        • Multi-site Sessions
    • Node.js App Caching
      • Web Sessions
    • ASP.NET Caching Benefits and Overview
      • ASP.NET Session State Provider Properties
      • Multi-region ASP.NET Session State Provider Configuration
      • Session Sharing between ASP.NET and ASP.NET Core
      • ASP.NET SignalR Backplane
        • NCache Extension for SignalR
      • ASP.NET View State Caching
        • View State Content Optimization Configuration
        • Group View State with Sessions
        • Limit View State Caching
        • Page Level Grouping
      • ASP.NET Output Cache
        • Output Caching Provider Overview
        • Output Cache with Custom Hooks
  • .NET Third Party Integrations
    • Entity Framework (EF) Core
      • Installation
      • Configure
      • EF Core Extension Methods
        • Extension Methods
        • Cache Handle
        • Caching Options
        • Query Deferred API
      • Logging in EF Core
    • Entity Framework EF 6
      • EF Second Level Cache
      • EF Caching Resync Provider
      • EF Caching Configuration File
    • NHibernate
      • Second Level Cache
      • Query Caching
      • Synchronize Database with Cache
    • Debug NCache Providers in Visual Studio
  • Java Third Party Integrations
    • Hibernate
      • Second Level Cache
      • Configure Cacheable Objects and Regions
      • Configure Application
      • Query Caching
    • Spring
      • Overview
      • Use NCache with Spring
        • Configure Generic Provider
        • Configure JCache Spring Caching Provider
        • Configure Caching Declaration
        • Configure Spring Sessions
    • JCache API
      • CRUD Operations
      • Expiration
      • Events
  • Third-Party Wrappers
    • AppFabric to NCache Migration
      • AppFabric API vs. NCache API
      • Configuration Differences Between AppFabric and NCache
      • Migrating from an AppFabric Application to NCache
    • Redis to NCache Migration
      • Redis to NCache Migration
    • Memcached Wrapper
      • Memcached Gateway Approach
      • Memcached Client Plugin for .NET

Read-through/Write-through and Write-behind for Cache

Client applications may need to perform operations on the data source when working with cache. To support this, NCache provides transparent read and write operations on the data source through Read-through and Write-through/Write-behind caching. This feature enables client applications to read from or write to the data source via the cache when required.

If your provider code is .NET-based, it will be executed in the same process where your cache is running. But, for Java-based provider, the NCache Execution Service will be responsible for code execution.

Read-through and Write-through caching facilitates the user in the following cases:

  1. The user needs to fetch data from the data source in case it is not present in the cache store (Read-through).
  2. The user needs to update data in the data source synchronously after updating the cache store (Write-through).
  3. The user needs to update data in the data source asynchronously after updating the cache store (Write-behind).

Using this feature in NCache has the following advantages:

  • NCache provides pluggable architecture for Read-through and Write-through caching, so the client application code does not need to contain data source logic.
  • The data source may change at any time, so this pluggable architecture can configure different data sources while keeping the application code intact.
  • Your application only needs to communicate with NCache and NCache will take care of any backend communication with the data source.

To use Read-through or Write-through caching, the IReadThruProvider or the IWriteThruProvider interface needs to be implemented. Runtime parameters can also be provided to the Read-through/Write-through provider while configuring it through the NCache Management Center or Command Line Tools. These parameters will be passed to the Read-through/Write-through provider on its initialization. These initialization parameters can be used in many ways, e.g., the connection string of a data source can be specified as a parameter eliminating the need to hardcode it in the provider code.

In NCache, the Read-through/Write-through providers are configured by name, and provider-specific API can be used by using the provider name. In case of multiple providers, one of the providers will be configured by default. This default provider will be called if a provider name is not mentioned explicitly through the API. Providers other than the default can be used by utilizing provider-specific overloads of the given API.

In This Section

Read-through Caching
Explains how to read data from the data source in NCache.

Write-through Caching
Explains how to write data to the data source in NCache.

In This Article
  • In This Section

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