How do i clear the cache of the item after publishing

Question

Hi On Save event i am publishing the changes to another database (another environment). Please refer Below link AutoPublishing doesn't work on Rename & Copy

How do i clear those published items from the cache in the destination .

Answer 1

If you are referring to HTML Cache, by default, Sitecore includes cache-clearing event handlers that clear the HTML cache when the publish:end and publish:end:remote events are raised. The handler is typed to the Sitecore.Publishing.HtmlCacheClearer class and calls the ClearCache method.

You can find the subscriptions for these events in your ShowConfig (/sitecore/admin/showconfig.aspx) by searching for publish:end and publish:end:remote.

<event name="publish:end" patch:source="Sitecore.Social.config">
  <handler type="Sitecore.Publishing.HtmlCacheClearer, Sitecore.Kernel" method="ClearCache">
    <sites hint="list">      <!-- list of sites to clear the cache for-->
      <site>website</site>
    </sites>
  </handler>
  ...
</event>
<event name="publish:end:remote" patch:source="Sitecore.ContentSearch.config">
  <handler type="Sitecore.Publishing.HtmlCacheClearer, Sitecore.Kernel" method="ClearCache">
    <sites hint="list">      <!-- list of sites to clear the cache for-->
      <site>website</site> 
    </sites>
  </handler>
  ...
</event>

Note that if you set a custom name for your site (i.e. a name other than "website") or if you have multiple sites, then you will need to make sure that these sites are included in the list of sites to be cleared.

Answer 2

As Zachary already mentioned, you can use the Sitecore OOTB HTML Cache agent to clear the cache. As quoted below, you mentioned

clear those published items from the cache in the destination

Using the default Sitecore HTML Cache Clearance agent, will clear all the cache for all the sites presents between the <sites> tag. I think that you can clear the cache specific to the site.

For example, if you have published an item which is present in Site A, you'll want to clear the cache for Site A instead of all sites.

You can accomplish this by implementing a handler which clears the cache for a specific site based on the item. Below is a sample code. Note that I haven't yet tested the code.

public class PublishingOnSaved
{
    public string SiteName { get; set; }

    public void OnSavedItem(object sender, EventArgs args)
    {
        var currentItem = Event.ExtractParameter(args, 0) as Item;

        if (currentItem == null)
        {
            return;
        }

        this.SiteName = GetSiteFromItem(currentItem);

        // Codes for publishing is here
    }

    public void OnSiteCacheClearance(object sender, EventArgs args)
    {
        var caches = CacheManager.GetAllCaches();

        foreach (var cache in caches)
        {
            if (cache.Name.ToLower().Contains(this.SiteName))
            {
                cache.Clear();
            }
        }
    }

    private string GetSiteFromItem(Item item)
    {
        // Add logic to get site from item. 
    }
}

Then add your handler to the publish:end and publish:end:remote.

<configuration xmlns:patch="http://www.sitecore.net/xmlconfig/">
  <sitecore>
    <events>
      <event name="publish:end">
        <handler type="YourNamespaceWithClass, YourAssembly" method="OnSiteCacheClearance">
      </event>
      <event name="publish:end:remote">
        <handler type="YourNamespaceWithClass, YourAssembly" method="OnSiteCacheClearance">
      </event>
    </events>
  </sitecore>
</configuration>

Answer 3

In Sitecore 10.1 a new rendering parameter is added under the caching section. Setting the Cache Clearing Behavior field to Clear on publish would clear the rendering cache on publish of the item. PFB the screenshot