configurable filtering expression evaluation timeout

commafeed-server/src/main/java/com/commafeed/CommaFeedConfiguration.java

@@ -167,6 +167,12 @@ public interface CommaFeedConfiguration {
 		 */
 		@WithDefault("0")
 		Duration userInactivityPeriod();
+
+		/**
+		 * Duration after which the evaluation of a filtering expresion to mark an entry as read is considered to have timed out.
+		 */
+		@WithDefault("500ms")
+		Duration filteringExpressionEvaluationTimeout();
 	}
 
 	interface Database {

commafeed-server/src/main/java/com/commafeed/backend/service/FeedEntryFilteringService.java

@@ -23,6 +23,7 @@ import org.apache.commons.lang3.StringUtils;
 import org.apache.commons.logging.LogFactory;
 import org.jsoup.Jsoup;
 
+import com.commafeed.CommaFeedConfiguration;
 import com.commafeed.backend.model.FeedEntry;
 
 import jakarta.inject.Singleton;
@@ -35,6 +36,7 @@ public class FeedEntryFilteringService {
 	private static final JexlEngine ENGINE = initEngine();
 
 	private final ExecutorService executor = Executors.newCachedThreadPool();
+	private final CommaFeedConfiguration config;
 
 	private static JexlEngine initEngine() {
 		// classloader that prevents object creation
@@ -96,8 +98,9 @@ public class FeedEntryFilteringService {
 		Future<Object> future = executor.submit(callable);
 		Object result;
 		try {
-			result = future.get(500, TimeUnit.MILLISECONDS);
+			result = future.get(config.feedRefresh().filteringExpressionEvaluationTimeout().toMillis(), TimeUnit.MILLISECONDS);
 		} catch (InterruptedException e) {
+			Thread.currentThread().interrupt();
 			throw new FeedEntryFilterException("interrupted while evaluating expression " + filter, e);
 		} catch (ExecutionException e) {
 			throw new FeedEntryFilterException("Exception while evaluating expression " + filter, e);