Programmatic Cache Invalidation in AEM 6

Programmatic Cache Invalidation in AEM 6

There are three ways of doing it.

1. By sending post request to the dispatcher cache invalidation URL as follows.

                HttpClient client = new HttpClient();
HostConfiguration configuration = new HostConfiguration();
                // This uri is http://dispatcherhost:dispatcherport/dispatcher/invalidate.cache
                // Without this host configuration there will be and exception with the message "Host is null"
configuration.setHost(uri);
client.setHostConfiguration(configuration);
PostMethod post = new PostMethod(uri);
                // CQ-Action:Delete will delete the cache from dispatcher.
                // For cache invalidation Activate action should be used.
post.setRequestHeader("CQ-Action", "Activate");
                // pagePath specifies the page that needs to be invalidated
post.setRequestHeader("CQ-Handle", pagePath);
StringRequestEntity body = new StringRequestEntity(pagePath, null, null);
post.setRequestEntity(body);
post.setRequestHeader("Content-length",String.valueOf(body.getContentLength()));
client.executeMethod(post);
post.releaseConnection();

2. Using DispatcherFlusher provided by ACS commons.

First make reference to DispatcherFlusher

       @Reference
      private DispatcherFlusher dispatcherFlusher;

Next make use of it to flush the cache

             dispatcherFlusher.flush(getResourceResolver(repo.loginAdministrative(null)), pagePath);

3. FlushService (Available in AEM 6.2+ versions)
   
             FlushService flushService = sling.getService(Replicator.class);
             flushService.sendFlushUrl("admin",FlushService.FlushType.IMMEDIATE_FLUSH, pagePath,FlushService.RefetchType.IMMEDIATE_REFETCH,new String[] {pagePath});