Package com.gitblit.tickets

Source Code of com.gitblit.tickets.BranchTicketService

/*
* Copyright 2014 gitblit.com.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*     http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.gitblit.tickets;

import java.io.IOException;
import java.text.MessageFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.TreeSet;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicLong;

import org.eclipse.jgit.api.errors.ConcurrentRefUpdateException;
import org.eclipse.jgit.api.errors.JGitInternalException;
import org.eclipse.jgit.dircache.DirCache;
import org.eclipse.jgit.dircache.DirCacheBuilder;
import org.eclipse.jgit.dircache.DirCacheEntry;
import org.eclipse.jgit.events.RefsChangedEvent;
import org.eclipse.jgit.events.RefsChangedListener;
import org.eclipse.jgit.internal.JGitText;
import org.eclipse.jgit.lib.CommitBuilder;
import org.eclipse.jgit.lib.FileMode;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.ObjectInserter;
import org.eclipse.jgit.lib.PersonIdent;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.lib.RefRename;
import org.eclipse.jgit.lib.RefUpdate;
import org.eclipse.jgit.lib.RefUpdate.Result;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.revwalk.RevTree;
import org.eclipse.jgit.revwalk.RevWalk;
import org.eclipse.jgit.transport.ReceiveCommand;
import org.eclipse.jgit.treewalk.CanonicalTreeParser;
import org.eclipse.jgit.treewalk.TreeWalk;

import com.gitblit.Constants;
import com.gitblit.git.ReceiveCommandEvent;
import com.gitblit.manager.INotificationManager;
import com.gitblit.manager.IPluginManager;
import com.gitblit.manager.IRepositoryManager;
import com.gitblit.manager.IRuntimeManager;
import com.gitblit.manager.IUserManager;
import com.gitblit.models.PathModel;
import com.gitblit.models.PathModel.PathChangeModel;
import com.gitblit.models.RefModel;
import com.gitblit.models.RepositoryModel;
import com.gitblit.models.TicketModel;
import com.gitblit.models.TicketModel.Attachment;
import com.gitblit.models.TicketModel.Change;
import com.gitblit.utils.ArrayUtils;
import com.gitblit.utils.JGitUtils;
import com.gitblit.utils.StringUtils;

/**
* Implementation of a ticket service based on an orphan branch.  All tickets
* are serialized as a list of JSON changes and persisted in a hashed directory
* structure, similar to the standard git loose object structure.
*
* @author James Moger
*
*/
public class BranchTicketService extends ITicketService implements RefsChangedListener {

  public static final String BRANCH = "refs/meta/gitblit/tickets";

  private static final String JOURNAL = "journal.json";

  private static final String ID_PATH = "id/";

  private final Map<String, AtomicLong> lastAssignedId;

  public BranchTicketService(
      IRuntimeManager runtimeManager,
      IPluginManager pluginManager,
      INotificationManager notificationManager,
      IUserManager userManager,
      IRepositoryManager repositoryManager) {

    super(runtimeManager,
        pluginManager,
        notificationManager,
        userManager,
        repositoryManager);

    lastAssignedId = new ConcurrentHashMap<String, AtomicLong>();

    // register the branch ticket service for repository ref changes
    Repository.getGlobalListenerList().addRefsChangedListener(this);
  }

  @Override
  public BranchTicketService start() {
    return this;
  }

  @Override
  protected void resetCachesImpl() {
    lastAssignedId.clear();
  }

  @Override
  protected void resetCachesImpl(RepositoryModel repository) {
    if (lastAssignedId.containsKey(repository.name)) {
      lastAssignedId.get(repository.name).set(0);
    }
  }

  @Override
  protected void close() {
  }

  /**
   * Listen for tickets branch changes and (re)index tickets, as appropriate
   */
  @Override
  public synchronized void onRefsChanged(RefsChangedEvent event) {
    if (!(event instanceof ReceiveCommandEvent)) {
      return;
    }

    ReceiveCommandEvent branchUpdate = (ReceiveCommandEvent) event;
    RepositoryModel repository = branchUpdate.model;
    ReceiveCommand cmd = branchUpdate.cmd;
    try {
      switch (cmd.getType()) {
      case CREATE:
      case UPDATE_NONFASTFORWARD:
        // reindex everything
        reindex(repository);
        break;
      case UPDATE:
        // incrementally index ticket updates
        resetCaches(repository);
        long start = System.nanoTime();
        log.info("incrementally indexing {} ticket branch due to received ref update", repository.name);
        Repository db = repositoryManager.getRepository(repository.name);
        try {
          Set<Long> ids = new HashSet<Long>();
          List<PathChangeModel> paths = JGitUtils.getFilesInRange(db,
              cmd.getOldId().getName(), cmd.getNewId().getName());
          for (PathChangeModel path : paths) {
            String name = path.name.substring(path.name.lastIndexOf('/') + 1);
            if (!JOURNAL.equals(name)) {
              continue;
            }
            String tid = path.path.split("/")[2];
            long ticketId = Long.parseLong(tid);
            if (!ids.contains(ticketId)) {
              ids.add(ticketId);
              TicketModel ticket = getTicket(repository, ticketId);
              log.info(MessageFormat.format("indexing ticket #{0,number,0}: {1}",
                  ticketId, ticket.title));
              indexer.index(ticket);
            }
          }
          long end = System.nanoTime();
          log.info("incremental indexing of {0} ticket(s) completed in {1} msecs",
              ids.size(), TimeUnit.NANOSECONDS.toMillis(end - start));
        } finally {
          db.close();
        }
        break;
      default:
        log.warn("Unexpected receive type {} in BranchTicketService.onRefsChanged" + cmd.getType());
        break;
      }
    } catch (Exception e) {
      log.error("failed to reindex " + repository.name, e);
    }
  }

  /**
   * Returns a RefModel for the refs/meta/gitblit/tickets branch in the repository.
   * If the branch can not be found, null is returned.
   *
   * @return a refmodel for the gitblit tickets branch or null
   */
  private RefModel getTicketsBranch(Repository db) {
    List<RefModel> refs = JGitUtils.getRefs(db, "refs/");
    Ref oldRef = null;
    for (RefModel ref : refs) {
      if (ref.reference.getName().equals(BRANCH)) {
        return ref;
      } else if (ref.reference.getName().equals("refs/gitblit/tickets")) {
        oldRef = ref.reference;
      }
    }
    if (oldRef != null) {
      // rename old ref to refs/meta/gitblit/tickets
      RefRename cmd;
      try {
        cmd = db.renameRef(oldRef.getName(), BRANCH);
        cmd.setRefLogIdent(new PersonIdent("Gitblit", "gitblit@localhost"));
        cmd.setRefLogMessage("renamed " + oldRef.getName() + " => " + BRANCH);
        Result res = cmd.rename();
        switch (res) {
        case RENAMED:
          log.info(db.getDirectory() + " " + cmd.getRefLogMessage());
          return getTicketsBranch(db);
        default:
          log.error("failed to rename " + oldRef.getName() + " => " + BRANCH + " (" + res.name() + ")");
        }
      } catch (IOException e) {
        log.error("failed to rename tickets branch", e);
      }
    }
    return null;
  }

  /**
   * Creates the refs/meta/gitblit/tickets branch.
   * @param db
   */
  private void createTicketsBranch(Repository db) {
    JGitUtils.createOrphanBranch(db, BRANCH, null);
  }

  /**
   * Returns the ticket path. This follows the same scheme as Git's object
   * store path where the first two characters of the hash id are the root
   * folder with the remaining characters as a subfolder within that folder.
   *
   * @param ticketId
   * @return the root path of the ticket content on the refs/meta/gitblit/tickets branch
   */
  private String toTicketPath(long ticketId) {
    StringBuilder sb = new StringBuilder();
    sb.append(ID_PATH);
    long m = ticketId % 100L;
    if (m < 10) {
      sb.append('0');
    }
    sb.append(m);
    sb.append('/');
    sb.append(ticketId);
    return sb.toString();
  }

  /**
   * Returns the path to the attachment for the specified ticket.
   *
   * @param ticketId
   * @param filename
   * @return the path to the specified attachment
   */
  private String toAttachmentPath(long ticketId, String filename) {
    return toTicketPath(ticketId) + "/attachments/" + filename;
  }

  /**
   * Reads a file from the tickets branch.
   *
   * @param db
   * @param file
   * @return the file content or null
   */
  private String readTicketsFile(Repository db, String file) {
    RevWalk rw = null;
    try {
      ObjectId treeId = db.resolve(BRANCH + "^{tree}");
      if (treeId == null) {
        return null;
      }
      rw = new RevWalk(db);
      RevTree tree = rw.lookupTree(treeId);
      if (tree != null) {
        return JGitUtils.getStringContent(db, tree, file, Constants.ENCODING);
      }
    } catch (IOException e) {
      log.error("failed to read " + file, e);
    } finally {
      if (rw != null) {
        rw.release();
      }
    }
    return null;
  }

  /**
   * Writes a file to the tickets branch.
   *
   * @param db
   * @param file
   * @param content
   * @param createdBy
   * @param msg
   */
  private void writeTicketsFile(Repository db, String file, String content, String createdBy, String msg) {
    if (getTicketsBranch(db) == null) {
      createTicketsBranch(db);
    }

    DirCache newIndex = DirCache.newInCore();
    DirCacheBuilder builder = newIndex.builder();
    ObjectInserter inserter = db.newObjectInserter();

    try {
      // create an index entry for the revised index
      final DirCacheEntry idIndexEntry = new DirCacheEntry(file);
      idIndexEntry.setLength(content.length());
      idIndexEntry.setLastModified(System.currentTimeMillis());
      idIndexEntry.setFileMode(FileMode.REGULAR_FILE);

      // insert new ticket index
      idIndexEntry.setObjectId(inserter.insert(org.eclipse.jgit.lib.Constants.OBJ_BLOB,
          content.getBytes(Constants.ENCODING)));

      // add to temporary in-core index
      builder.add(idIndexEntry);

      Set<String> ignorePaths = new HashSet<String>();
      ignorePaths.add(file);

      for (DirCacheEntry entry : getTreeEntries(db, ignorePaths)) {
        builder.add(entry);
      }

      // finish temporary in-core index used for this commit
      builder.finish();

      // commit the change
      commitIndex(db, newIndex, createdBy, msg);

    } catch (ConcurrentRefUpdateException e) {
      log.error("", e);
    } catch (IOException e) {
      log.error("", e);
    } finally {
      inserter.release();
    }
  }

  /**
   * Ensures that we have a ticket for this ticket id.
   *
   * @param repository
   * @param ticketId
   * @return true if the ticket exists
   */
  @Override
  public boolean hasTicket(RepositoryModel repository, long ticketId) {
    boolean hasTicket = false;
    Repository db = repositoryManager.getRepository(repository.name);
    try {
      RefModel ticketsBranch = getTicketsBranch(db);
      if (ticketsBranch == null) {
        return false;
      }
      String ticketPath = toTicketPath(ticketId);
      RevCommit tip = JGitUtils.getCommit(db, BRANCH);
      hasTicket = !JGitUtils.getFilesInPath(db, ticketPath, tip).isEmpty();
    } finally {
      db.close();
    }
    return hasTicket;
  }

  /**
   * Assigns a new ticket id.
   *
   * @param repository
   * @return a new long id
   */
  @Override
  public synchronized long assignNewId(RepositoryModel repository) {
    long newId = 0L;
    Repository db = repositoryManager.getRepository(repository.name);
    try {
      if (getTicketsBranch(db) == null) {
        createTicketsBranch(db);
      }

      // identify current highest ticket id by scanning the paths in the tip tree
      if (!lastAssignedId.containsKey(repository.name)) {
        lastAssignedId.put(repository.name, new AtomicLong(0));
      }
      AtomicLong lastId = lastAssignedId.get(repository.name);
      if (lastId.get() <= 0) {
        List<PathModel> paths = JGitUtils.getDocuments(db, Arrays.asList("json"), BRANCH);
        for (PathModel path : paths) {
          String name = path.name.substring(path.name.lastIndexOf('/') + 1);
          if (!JOURNAL.equals(name)) {
            continue;
          }
          String tid = path.path.split("/")[2];
          long ticketId = Long.parseLong(tid);
          if (ticketId > lastId.get()) {
            lastId.set(ticketId);
          }
        }
      }

      // assign the id and touch an empty journal to hold it's place
      newId = lastId.incrementAndGet();
      String journalPath = toTicketPath(newId) + "/" + JOURNAL;
      writeTicketsFile(db, journalPath, "", "gitblit", "assigned id #" + newId);
    } finally {
      db.close();
    }
    return newId;
  }

  /**
   * Returns all the tickets in the repository. Querying tickets from the
   * repository requires deserializing all tickets. This is an  expensive
   * process and not recommended. Tickets are indexed by Lucene and queries
   * should be executed against that index.
   *
   * @param repository
   * @param filter
   *            optional filter to only return matching results
   * @return a list of tickets
   */
  @Override
  public List<TicketModel> getTickets(RepositoryModel repository, TicketFilter filter) {
    List<TicketModel> list = new ArrayList<TicketModel>();

    Repository db = repositoryManager.getRepository(repository.name);
    try {
      RefModel ticketsBranch = getTicketsBranch(db);
      if (ticketsBranch == null) {
        return list;
      }

      // Collect the set of all json files
      List<PathModel> paths = JGitUtils.getDocuments(db, Arrays.asList("json"), BRANCH);

      // Deserialize each ticket and optionally filter out unwanted tickets
      for (PathModel path : paths) {
        String name = path.name.substring(path.name.lastIndexOf('/') + 1);
        if (!JOURNAL.equals(name)) {
          continue;
        }
        String json = readTicketsFile(db, path.path);
        if (StringUtils.isEmpty(json)) {
          // journal was touched but no changes were written
          continue;
        }
        try {
          // Reconstruct ticketId from the path
          // id/26/326/journal.json
          String tid = path.path.split("/")[2];
          long ticketId = Long.parseLong(tid);
          List<Change> changes = TicketSerializer.deserializeJournal(json);
          if (ArrayUtils.isEmpty(changes)) {
            log.warn("Empty journal for {}:{}", repository, path.path);
            continue;
          }
          TicketModel ticket = TicketModel.buildTicket(changes);
          ticket.project = repository.projectPath;
          ticket.repository = repository.name;
          ticket.number = ticketId;

          // add the ticket, conditionally, to the list
          if (filter == null) {
            list.add(ticket);
          } else {
            if (filter.accept(ticket)) {
              list.add(ticket);
            }
          }
        } catch (Exception e) {
          log.error("failed to deserialize {}/{}\n{}",
              new Object [] { repository, path.path, e.getMessage()});
          log.error(null, e);
        }
      }

      // sort the tickets by creation
      Collections.sort(list);
      return list;
    } finally {
      db.close();
    }
  }

  /**
   * Retrieves the ticket from the repository by first looking-up the changeId
   * associated with the ticketId.
   *
   * @param repository
   * @param ticketId
   * @return a ticket, if it exists, otherwise null
   */
  @Override
  protected TicketModel getTicketImpl(RepositoryModel repository, long ticketId) {
    Repository db = repositoryManager.getRepository(repository.name);
    try {
      List<Change> changes = getJournal(db, ticketId);
      if (ArrayUtils.isEmpty(changes)) {
        log.warn("Empty journal for {}:{}", repository, ticketId);
        return null;
      }
      TicketModel ticket = TicketModel.buildTicket(changes);
      if (ticket != null) {
        ticket.project = repository.projectPath;
        ticket.repository = repository.name;
        ticket.number = ticketId;
      }
      return ticket;
    } finally {
      db.close();
    }
  }

  /**
   * Returns the journal for the specified ticket.
   *
   * @param db
   * @param ticketId
   * @return a list of changes
   */
  private List<Change> getJournal(Repository db, long ticketId) {
    RefModel ticketsBranch = getTicketsBranch(db);
    if (ticketsBranch == null) {
      return new ArrayList<Change>();
    }

    if (ticketId <= 0L) {
      return new ArrayList<Change>();
    }

    String journalPath = toTicketPath(ticketId) + "/" + JOURNAL;
    String json = readTicketsFile(db, journalPath);
    if (StringUtils.isEmpty(json)) {
      return new ArrayList<Change>();
    }
    List<Change> list = TicketSerializer.deserializeJournal(json);
    return list;
  }

  @Override
  public boolean supportsAttachments() {
    return true;
  }

  /**
   * Retrieves the specified attachment from a ticket.
   *
   * @param repository
   * @param ticketId
   * @param filename
   * @return an attachment, if found, null otherwise
   */
  @Override
  public Attachment getAttachment(RepositoryModel repository, long ticketId, String filename) {
    if (ticketId <= 0L) {
      return null;
    }

    // deserialize the ticket model so that we have the attachment metadata
    TicketModel ticket = getTicket(repository, ticketId);
    Attachment attachment = ticket.getAttachment(filename);

    // attachment not found
    if (attachment == null) {
      return null;
    }

    // retrieve the attachment content
    Repository db = repositoryManager.getRepository(repository.name);
    try {
      String attachmentPath = toAttachmentPath(ticketId, attachment.name);
      RevTree tree = JGitUtils.getCommit(db, BRANCH).getTree();
      byte[] content = JGitUtils.getByteContent(db, tree, attachmentPath, false);
      attachment.content = content;
      attachment.size = content.length;
      return attachment;
    } finally {
      db.close();
    }
  }

  /**
   * Deletes a ticket from the repository.
   *
   * @param ticket
   * @return true if successful
   */
  @Override
  protected synchronized boolean deleteTicketImpl(RepositoryModel repository, TicketModel ticket, String deletedBy) {
    if (ticket == null) {
      throw new RuntimeException("must specify a ticket!");
    }

    boolean success = false;
    Repository db = repositoryManager.getRepository(ticket.repository);
    try {
      RefModel ticketsBranch = getTicketsBranch(db);

      if (ticketsBranch == null) {
        throw new RuntimeException(BRANCH + " does not exist!");
      }
      String ticketPath = toTicketPath(ticket.number);

      TreeWalk treeWalk = null;
      try {
        ObjectId treeId = db.resolve(BRANCH + "^{tree}");

        // Create the in-memory index of the new/updated ticket
        DirCache index = DirCache.newInCore();
        DirCacheBuilder builder = index.builder();

        // Traverse HEAD to add all other paths
        treeWalk = new TreeWalk(db);
        int hIdx = -1;
        if (treeId != null) {
          hIdx = treeWalk.addTree(treeId);
        }
        treeWalk.setRecursive(true);
        while (treeWalk.next()) {
          String path = treeWalk.getPathString();
          CanonicalTreeParser hTree = null;
          if (hIdx != -1) {
            hTree = treeWalk.getTree(hIdx, CanonicalTreeParser.class);
          }
          if (!path.startsWith(ticketPath)) {
            // add entries from HEAD for all other paths
            if (hTree != null) {
              final DirCacheEntry entry = new DirCacheEntry(path);
              entry.setObjectId(hTree.getEntryObjectId());
              entry.setFileMode(hTree.getEntryFileMode());

              // add to temporary in-core index
              builder.add(entry);
            }
          }
        }

        // finish temporary in-core index used for this commit
        builder.finish();

        success = commitIndex(db, index, deletedBy, "- " + ticket.number);

      } catch (Throwable t) {
        log.error(MessageFormat.format("Failed to delete ticket {0,number,0} from {1}",
            ticket.number, db.getDirectory()), t);
      } finally {
        // release the treewalk
        if (treeWalk != null) {
          treeWalk.release();
        }
      }
    } finally {
      db.close();
    }
    return success;
  }

  /**
   * Commit a ticket change to the repository.
   *
   * @param repository
   * @param ticketId
   * @param change
   * @return true, if the change was committed
   */
  @Override
  protected synchronized boolean commitChangeImpl(RepositoryModel repository, long ticketId, Change change) {
    boolean success = false;

    Repository db = repositoryManager.getRepository(repository.name);
    try {
      DirCache index = createIndex(db, ticketId, change);
      success = commitIndex(db, index, change.author, "#" + ticketId);

    } catch (Throwable t) {
      log.error(MessageFormat.format("Failed to commit ticket {0,number,0} to {1}",
          ticketId, db.getDirectory()), t);
    } finally {
      db.close();
    }
    return success;
  }

  /**
   * Creates an in-memory index of the ticket change.
   *
   * @param changeId
   * @param change
   * @return an in-memory index
   * @throws IOException
   */
  private DirCache createIndex(Repository db, long ticketId, Change change)
      throws IOException, ClassNotFoundException, NoSuchFieldException {

    String ticketPath = toTicketPath(ticketId);
    DirCache newIndex = DirCache.newInCore();
    DirCacheBuilder builder = newIndex.builder();
    ObjectInserter inserter = db.newObjectInserter();

    Set<String> ignorePaths = new TreeSet<String>();
    try {
      // create/update the journal
      // exclude the attachment content
      List<Change> changes = getJournal(db, ticketId);
      changes.add(change);
      String journal = TicketSerializer.serializeJournal(changes).trim();

      byte [] journalBytes = journal.getBytes(Constants.ENCODING);
      String journalPath = ticketPath + "/" + JOURNAL;
      final DirCacheEntry journalEntry = new DirCacheEntry(journalPath);
      journalEntry.setLength(journalBytes.length);
      journalEntry.setLastModified(change.date.getTime());
      journalEntry.setFileMode(FileMode.REGULAR_FILE);
      journalEntry.setObjectId(inserter.insert(org.eclipse.jgit.lib.Constants.OBJ_BLOB, journalBytes));

      // add journal to index
      builder.add(journalEntry);
      ignorePaths.add(journalEntry.getPathString());

      // Add any attachments to the index
      if (change.hasAttachments()) {
        for (Attachment attachment : change.attachments) {
          // build a path name for the attachment and mark as ignored
          String path = toAttachmentPath(ticketId, attachment.name);
          ignorePaths.add(path);

          // create an index entry for this attachment
          final DirCacheEntry entry = new DirCacheEntry(path);
          entry.setLength(attachment.content.length);
          entry.setLastModified(change.date.getTime());
          entry.setFileMode(FileMode.REGULAR_FILE);

          // insert object
          entry.setObjectId(inserter.insert(org.eclipse.jgit.lib.Constants.OBJ_BLOB, attachment.content));

          // add to temporary in-core index
          builder.add(entry);
        }
      }

      for (DirCacheEntry entry : getTreeEntries(db, ignorePaths)) {
        builder.add(entry);
      }

      // finish the index
      builder.finish();
    } finally {
      inserter.release();
    }
    return newIndex;
  }

  /**
   * Returns all tree entries that do not match the ignore paths.
   *
   * @param db
   * @param ignorePaths
   * @param dcBuilder
   * @throws IOException
   */
  private List<DirCacheEntry> getTreeEntries(Repository db, Collection<String> ignorePaths) throws IOException {
    List<DirCacheEntry> list = new ArrayList<DirCacheEntry>();
    TreeWalk tw = null;
    try {
      tw = new TreeWalk(db);
      ObjectId treeId = db.resolve(BRANCH + "^{tree}");
      int hIdx = tw.addTree(treeId);
      tw.setRecursive(true);

      while (tw.next()) {
        String path = tw.getPathString();
        CanonicalTreeParser hTree = null;
        if (hIdx != -1) {
          hTree = tw.getTree(hIdx, CanonicalTreeParser.class);
        }
        if (!ignorePaths.contains(path)) {
          // add all other tree entries
          if (hTree != null) {
            final DirCacheEntry entry = new DirCacheEntry(path);
            entry.setObjectId(hTree.getEntryObjectId());
            entry.setFileMode(hTree.getEntryFileMode());
            list.add(entry);
          }
        }
      }
    } finally {
      if (tw != null) {
        tw.release();
      }
    }
    return list;
  }

  private boolean commitIndex(Repository db, DirCache index, String author, String message) throws IOException, ConcurrentRefUpdateException {
    boolean success = false;

    ObjectId headId = db.resolve(BRANCH + "^{commit}");
    if (headId == null) {
      // create the branch
      createTicketsBranch(db);
      headId = db.resolve(BRANCH + "^{commit}");
    }
    ObjectInserter odi = db.newObjectInserter();
    try {
      // Create the in-memory index of the new/updated ticket
      ObjectId indexTreeId = index.writeTree(odi);

      // Create a commit object
      PersonIdent ident = new PersonIdent(author, "gitblit@localhost");
      CommitBuilder commit = new CommitBuilder();
      commit.setAuthor(ident);
      commit.setCommitter(ident);
      commit.setEncoding(Constants.ENCODING);
      commit.setMessage(message);
      commit.setParentId(headId);
      commit.setTreeId(indexTreeId);

      // Insert the commit into the repository
      ObjectId commitId = odi.insert(commit);
      odi.flush();

      RevWalk revWalk = new RevWalk(db);
      try {
        RevCommit revCommit = revWalk.parseCommit(commitId);
        RefUpdate ru = db.updateRef(BRANCH);
        ru.setNewObjectId(commitId);
        ru.setExpectedOldObjectId(headId);
        ru.setRefLogMessage("commit: " + revCommit.getShortMessage(), false);
        Result rc = ru.forceUpdate();
        switch (rc) {
        case NEW:
        case FORCED:
        case FAST_FORWARD:
          success = true;
          break;
        case REJECTED:
        case LOCK_FAILURE:
          throw new ConcurrentRefUpdateException(JGitText.get().couldNotLockHEAD,
              ru.getRef(), rc);
        default:
          throw new JGitInternalException(MessageFormat.format(
              JGitText.get().updatingRefFailed, BRANCH, commitId.toString(),
              rc));
        }
      } finally {
        revWalk.release();
      }
    } finally {
      odi.release();
    }
    return success;
  }

  @Override
  protected boolean deleteAllImpl(RepositoryModel repository) {
    Repository db = repositoryManager.getRepository(repository.name);
    try {
      RefModel branch = getTicketsBranch(db);
      if (branch != null) {
        return JGitUtils.deleteBranchRef(db, BRANCH);
      }
      return true;
    } catch (Exception e) {
      log.error(null, e);
    } finally {
      if (db != null) {
        db.close();
      }
    }
    return false;
  }

  @Override
  protected boolean renameImpl(RepositoryModel oldRepository, RepositoryModel newRepository) {
    return true;
  }

  @Override
  public String toString() {
    return getClass().getSimpleName();
  }
}
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