Configuring Write-Through Provider
This feature is only available in NCache Enterprise Edition.
To preserve the cache data in some persistent storage, you can configure write-through providers for a cache. By using write through provider, the cached data and data added/updated/removed is synchronized with a data source.
For Java, before deploying your JAR files, you need to make sure that:
- You have JDK 11 LTS installed
- Your Environment Variable for Java is set
Using NCache Web Manager
Java based providers can also be configured using NCache Web Manager.
Launch NCache Web Manager by browsing to http://localhost:8251 or
<server-ip>:8251on Windows and Linux.
In the left navigation bar, click on Clustered Caches or Local Caches, based on the cache to which the query index will be added. Against the cache name, click on View Details.
Make sure that the cache is stopped.
This opens up the detailed configuration page for the cache. Go to the Advanced Settings tab and click on Backing Source in the left bar.
Check the Enable Write Through box. Select + Add Provider.
A new page will open up. Enter the Provider Name in the text box and then click on the ... button to browse for assembly implementing
IWriteThruProviderinterface. Select the class name from the drop down list.
Select the required Write-Through provider.
- You can also provide the values to your write-through provider class, if required. Specify the parameter name in Parameter field and its value against it under the Value field.
These parameters, along with their assigned values, are passed to the selected Write-Through provider when it is initialized on cache start. Providing the parameters is optional.
Selected provider class will be listed in Read-Through provider list at Backing Source tab.
- Deploy the write-through provider assembly along with its dependent assemblies if any. Click on the Deploy Backing Source Provider button at the bottom left of the Backing Source tab page. Browse for the required assemblies, select all of the required assemblies and click Open.
- After applying all the changes click on Save Changes.
Add-BackingSource cmdlet enable users to configure backing source (read-through, write-through) providers for the specified cache.
This command configures Writer1 as write-through provider on demoClusteredCache.
Add-BackingSource demoClusteredCache -AssemblyName C:\Downloads\Providers.dll -Class NCache.Sample.Providers.Writers.Writer1 -ProviderName writer1 -WriteThru
This command configures Writer2 as write-through provider on demoClusteredCache using the executable jar.
Add-BackingSource demoClusteredCache -AssemblyName C:\Downloads\BackinSourceProviders-1.0.jar -Class NCache.Sample.Providers.Writers.Writer2 -ProviderName writer2 -WriteThru
Remove-BackingSource cmdlet removes the pre-configured backing source providers (read-through or write-through) from the cache or a specified server.
The following command removes the pre-configured write-through provider named Writer1 from demoClusteredCache existing on server 188.8.131.52.
Remove-BackingSource demoClusteredCache -ProviderName MyWriter –WriteThru –Server 184.108.40.206