introduce constants for maximum changeset count

Author: Vladimir Kotal

opengrok-indexer/src/main/java/org/opengrok/indexer/history/GitRepository.java

@@ -135,6 +135,7 @@ public class GitRepository extends RepositoryWithPerPartesHistory {
     private static final LazilyInstantiate<Boolean> GIT_IS_WORKING = LazilyInstantiate.using(GitRepository::isGitWorking);
 
     public static final int GIT_ABBREV_LEN = 8;
+    public static final int MAX_CHANGESETS = 512;
 
     public GitRepository() {
         type = "git";
@@ -529,7 +530,7 @@ History getHistory(File file, String sinceRevision) throws HistoryException {
     }
 
     public int getPerPartesCount() {
-        return 512;
+        return MAX_CHANGESETS;
     }
 
     public void accept(String sinceRevision, IChangesetVisitor visitor) throws HistoryException {

opengrok-indexer/src/main/java/org/opengrok/indexer/history/RepositoryWithPerPartesHistory.java

@@ -30,6 +30,7 @@
  */
 public abstract class RepositoryWithPerPartesHistory extends Repository {
     private static final long serialVersionUID = -3433255821312805064L;
+    public static final int MAX_CHANGESETS = 128;
 
     /**
      * Just like for {@link Repository#getHistory(File)} it is expected that the lists of (renamed) files
@@ -46,7 +47,7 @@ public abstract class RepositoryWithPerPartesHistory extends Repository {
      * @return maximum number of entries to retrieve
      */
     public int getPerPartesCount() {
-        return 128;
+        return MAX_CHANGESETS;
     }
 
     /**