[CST-12752] refactoring and added a new method into ServiceManager

dspace-api/src/main/java/org/dspace/content/ItemFilterServiceImpl.java

@@ -8,7 +8,6 @@
 package org.dspace.content;
 
 import java.util.List;
-import java.util.Objects;
 import java.util.stream.Collectors;
 
 import org.dspace.app.ldn.ItemFilter;
@@ -38,16 +37,12 @@ public class ItemFilterServiceImpl implements ItemFilterService {
 
     @Override
     public List<ItemFilter> findAll() {
-        return serviceManager.getServicesNames()
+        return serviceManager.getServicesWithNamesByType(LogicalStatement.class)
+                             .keySet()
                              .stream()
-                             .filter(id -> isLogicalStatement(id))
+                             .sorted()
-                             .map(id -> new ItemFilter(id))
+                             .map(ItemFilter::new)
                              .collect(Collectors.toList());
     }
 
-    private boolean isLogicalStatement(String id) {
-        return Objects.nonNull(
-            serviceManager.getServiceByName(id, LogicalStatement.class)
-        );
-    }
 }

dspace-services/src/main/java/org/dspace/kernel/ServiceManager.java

@@ -76,6 +76,15 @@ public interface ServiceManager {
      */
     public List<String> getServicesNames();
 
+    /**
+     * Get the names of all registered service singletons.  By
+     * convention, the name typically matches the fully qualified class
+     * name).
+     *
+     * @return the list of all current registered services
+     */
+    public <T> Map<String, T> getServicesWithNamesByType(Class<T> type);
+
     /**
      * Allows adding singleton services and providers in at runtime or
      * after the service manager has started up.

dspace-services/src/main/java/org/dspace/servicemanager/DSpaceServiceManager.java

@@ -504,6 +504,21 @@ public final class DSpaceServiceManager implements ServiceManagerSystem {
         return beanNames;
     }
 
+    @Override
+    public <T> Map<String, T> getServicesWithNamesByType(Class<T> type) {
+        checkRunning();
+
+        if (type == null) {
+            throw new IllegalArgumentException("type cannot be null");
+        }
+
+        try {
+            return applicationContext.getBeansOfType(type, true, true);
+        } catch (BeansException e) {
+            throw new RuntimeException("Failed to get beans of type (" + type + "): " + e.getMessage(), e);
+        }
+    }
+
     @Override
     public boolean isServiceExists(String name) {
         checkRunning();

dspace-services/src/test/java/org/dspace/servicemanager/MockServiceManagerSystem.java

@@ -80,6 +80,11 @@ public class MockServiceManagerSystem implements ServiceManagerSystem {
         return this.sms.getServicesNames();
     }
 
+    @Override
+    public <T> Map<String, T> getServicesWithNamesByType(Class<T> type) {
+        return this.sms.getServicesWithNamesByType(type);
+    }
+
     /* (non-Javadoc)
      * @see org.dspace.kernel.ServiceManager#isServiceExists(java.lang.String)
      */

dspace-services/src/test/java/org/dspace/utils/servicemanager/ProviderStackTest.java

@@ -13,6 +13,7 @@ import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertTrue;
 
 import java.util.ArrayList;
+import java.util.HashMap;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
@@ -84,6 +85,10 @@ public class ProviderStackTest {
                 return new ArrayList<String>();
             }
 
+            public <T> Map<String, T> getServicesWithNamesByType(Class<T> type) {
+                return new HashMap<>();
+            }
+
             public boolean isServiceExists(String name) {
                 return false;
             }