From ba19e9fc44d85bb510f1651177d8e7f317a65695 Mon Sep 17 00:00:00 2001
From: gjoranv <gjoranv@gmail.com>
Date: Wed, 23 May 2018 13:15:19 +0200
Subject: Revert "Remove empty filter chains from filter chain repo."

---
 .../java/com/yahoo/application/ApplicationTest.java     | 17 -----------------
 .../container/http/filter/FilterChainRepository.java    | 14 +-------------
 2 files changed, 1 insertion(+), 30 deletions(-)

diff --git a/application/src/test/java/com/yahoo/application/ApplicationTest.java b/application/src/test/java/com/yahoo/application/ApplicationTest.java
index 7b4f39b6ac4..9388c8f400e 100644
--- a/application/src/test/java/com/yahoo/application/ApplicationTest.java
+++ b/application/src/test/java/com/yahoo/application/ApplicationTest.java
@@ -372,21 +372,4 @@ public class ApplicationTest {
                 "</jdisc>";
     }
 
-    @Test
-    public void application_with_access_control_can_be_constructed() throws Exception {
-        try (Application application = Application.fromServicesXml(servicesXmlWithAccessControl(), Networking.disable)) {
-            Application unused = application;
-        }
-    }
-
-    private static String servicesXmlWithAccessControl() {
-        return "<jdisc version='1.0'>" +
-                "  <http> <server port='" + 0 +"' id='foo'/> " +
-                "    <filtering>" +
-                "      <access-control domain='foo' />" +
-                "    </filtering>" +
-                "  </http>" +
-                "</jdisc>";
-    }
-
 }
diff --git a/container-core/src/main/java/com/yahoo/container/http/filter/FilterChainRepository.java b/container-core/src/main/java/com/yahoo/container/http/filter/FilterChainRepository.java
index 31bceca9337..e4ec09e3948 100644
--- a/container-core/src/main/java/com/yahoo/container/http/filter/FilterChainRepository.java
+++ b/container-core/src/main/java/com/yahoo/container/http/filter/FilterChainRepository.java
@@ -25,7 +25,6 @@ import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
 import java.util.Set;
-import java.util.logging.Logger;
 
 import static java.util.Collections.emptyList;
 import static java.util.stream.Collectors.toList;
@@ -38,7 +37,6 @@ import static java.util.stream.Collectors.toSet;
  * @author bjorncs
  */
 public class FilterChainRepository extends AbstractComponent {
-    private static final Logger log = Logger.getLogger(FilterChainRepository.class.getName());
 
     private final ComponentRegistry<Object> filterAndChains;
 
@@ -79,23 +77,12 @@ public class FilterChainRepository extends AbstractComponent {
         ChainRegistry<FilterWrapper> chainRegistry = new ChainRegistry<>();
         ChainsModel chainsModel = ChainsModelBuilder.buildFromConfig(chainsConfig);
         ChainsConfigurer.prepareChainRegistry(chainRegistry, chainsModel, allFiltersWrapped(filters));
-        removeEmptyChains(chainRegistry);
         chainRegistry.freeze();
         return chainRegistry;
     }
 
-    private static void removeEmptyChains(ChainRegistry<FilterWrapper> chainRegistry) {
-        chainRegistry.allComponents().stream()
-                .filter(chain -> chain.components().isEmpty())
-                .map(Chain::getId)
-                .peek(id -> log.warning("Removing empty filter chain: " + id))
-                .forEach(chainRegistry::unregister);
-    }
-
     @SuppressWarnings("unchecked")
     private static Object toJDiscChain(Chain<FilterWrapper> chain) {
-        if (chain.components().isEmpty())
-            throw new IllegalArgumentException("Empty filter chain: " + chain.getId());
         checkFilterTypesCompatible(chain);
         List<?> jdiscFilters = chain.components().stream()
                         .map(filterWrapper -> filterWrapper.filter)
@@ -111,6 +98,7 @@ public class FilterChainRepository extends AbstractComponent {
     }
 
     private static List<?> wrapSecurityFilters(List<?> filters) {
+        if (filters.isEmpty()) return emptyList();
         List<Object> aggregatedSecurityFilters = new ArrayList<>();
         List<Object> wrappedFilters = new ArrayList<>();
         for (Object filter : filters) {
-- 
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