Fix for #8788 JabRef not showing contents of shared database library

CHANGELOG.md

@@ -23,6 +23,7 @@ Note that this project **does not** adhere to [Semantic Versioning](http://semve
 
 ### Fixed
 
+- We fixed an issue where the content of a big shared database library is not shown [#8788](https://github.com/JabRef/jabref/issues/8788)
 - We fixed the unnecessary horizontal scroll bar in group panel [#8467](https://github.com/JabRef/jabref/issues/8467)
 - We fixed an issue where the notification bar message, icon and actions appeared to be invisible. [#8761](https://github.com/JabRef/jabref/issues/8761)
 - We fixed an issue where deprecated fields tab is shown when the fields don't contain any values. [#8396](https://github.com/JabRef/jabref/issues/8396)

src/main/java/org/jabref/logic/shared/DBMSProcessor.java

@@ -26,6 +26,7 @@
 import org.jabref.model.entry.field.FieldFactory;
 import org.jabref.model.entry.types.EntryTypeFactory;
 
+import com.google.common.collect.Lists;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -477,6 +478,22 @@ public Optional<BibEntry> getSharedEntry(int sharedID) {
         }
     }
 
+    /**
+     * Queries the database for shared entries in 500 element batches.
+     * Optionally, they are filtered by the given list of sharedIds
+     *
+     * @param sharedIDs the list of Ids to filter. If list is empty, then no filter is applied
+     */
+    public List<BibEntry> partitionAndGetSharedEntries(List<Integer> sharedIDs) {
+        List<List<Integer>> partitions = Lists.partition(sharedIDs, 500);
+        List<BibEntry> result = new ArrayList<>();
+
+        for (List<Integer> sublist : partitions) {
+            result.addAll(getSharedEntries(sublist));
+        }
+        return result;
+    }
+
     /**
      * Queries the database for shared entries. Optionally, they are filtered by the given list of sharedIds
      *

src/main/java/org/jabref/logic/shared/DBMSSynchronizer.java

@@ -221,7 +221,7 @@ public void synchronizeLocalDatabase() {
 
         if (!entriesToInsertIntoLocalDatabase.isEmpty()) {
             // in case entries should be added into the local database, insert them
-            bibDatabase.insertEntries(dbmsProcessor.getSharedEntries(entriesToInsertIntoLocalDatabase), EntriesEventSource.SHARED);
+            bibDatabase.insertEntries(dbmsProcessor.partitionAndGetSharedEntries(entriesToInsertIntoLocalDatabase), EntriesEventSource.SHARED);
         }
     }