Examples of PackWriter

org.eclipse.jgit.internal.storage.pack.PackWriter
PackWriter class is responsible for generating pack files from specified set of objects from repository. This implementation produce pack files in format version 2.

Source of objects may be specified in two ways:
- (usually) by providing sets of interesting and uninteresting objects in repository - all interesting objects and their ancestors except uninteresting objects and their ancestors will be included in pack, or
- by providing iterator of {@link RevObject} specifying exact list andorder of objects in pack
Typical usage consists of creating instance intended for some pack, configuring options, preparing the list of objects by calling {@link #preparePack(Iterator)} or{@link #preparePack(ProgressMonitor,Collection,Collection)}, and finally producing the stream with {@link #writePack(ProgressMonitor,ProgressMonitor,OutputStream)}.

Class provide set of configurable options and {@link ProgressMonitor}support, as operations may take a long time for big repositories. Deltas searching algorithm is NOT IMPLEMENTED yet - this implementation relies only on deltas and objects reuse.

This class is not thread safe, it is intended to be used in one thread, with one instance per created pack. Subsequent calls to writePack result in undefined behavior.
org.eclipse.jgit.storage.pack.PackWriter
PackWriter class is responsible for generating pack files from specified set of objects from repository. This implementation produce pack files in format version 2.

Source of objects may be specified in two ways:
- (usually) by providing sets of interesting and uninteresting objects in repository - all interesting objects and their ancestors except uninteresting objects and their ancestors will be included in pack, or
- by providing iterator of {@link RevObject} specifying exact list andorder of objects in pack
Typical usage consists of creating instance intended for some pack, configuring options, preparing the list of objects by calling {@link #preparePack(Iterator)} or{@link #preparePack(ProgressMonitor,Collection,Collection)}, and finally producing the stream with {@link #writePack(ProgressMonitor,ProgressMonitor,OutputStream)}.

Class provide set of configurable options and {@link ProgressMonitor}support, as operations may take a long time for big repositories. Deltas searching algorithm is NOT IMPLEMENTED yet - this implementation relies only on deltas and objects reuse.

This class is not thread safe, it is intended to be used in one thread, with one instance per created pack. Subsequent calls to writePack result in undefined behavior.

Examples of org.eclipse.jgit.storage.pack.PackWriter

  private void sendpack(final List<RemoteRefUpdate> updates,
      final ProgressMonitor monitor) throws TransportException {
    String pathPack = null;
    String pathIdx = null;


    final PackWriter writer = new PackWriter(transport.getPackConfig(),
        local.newObjectReader());
    try {
      final Set<ObjectId> need = new HashSet<ObjectId>();
      final Set<ObjectId> have = new HashSet<ObjectId>();
      for (final RemoteRefUpdate r : updates)
        need.add(r.getNewObjectId());
      for (final Ref r : getRefs()) {
        have.add(r.getObjectId());
        if (r.getPeeledObjectId() != null)
          have.add(r.getPeeledObjectId());
      }
      writer.preparePack(monitor, need, have);


      // We don't have to continue further if the pack will
      // be an empty pack, as the remote has all objects it
      // needs to complete this change.
      //
      if (writer.getObjectCount() == 0)
        return;


      packNames = new LinkedHashMap<String, String>();
      for (final String n : dest.getPackNames())
        packNames.put(n, n);


      final String base = "pack-" + writer.computeName().name();
      final String packName = base + ".pack";
      pathPack = "pack/" + packName;
      pathIdx = "pack/" + base + ".idx";


      if (packNames.remove(packName) != null) {
        // The remote already contains this pack. We should
        // remove the index before overwriting to prevent bad
        // offsets from appearing to clients.
        //
        dest.writeInfoPacks(packNames.keySet());
        dest.deleteFile(pathIdx);
      }


      // Write the pack file, then the index, as readers look the
      // other direction (index, then pack file).
      //
      final String wt = "Put " + base.substring(0, 12);
      OutputStream os = dest.writeFile(pathPack, monitor, wt + "..pack");
      try {
        os = new SafeBufferedOutputStream(os);
        writer.writePack(monitor, monitor, os);
      } finally {
        os.close();
      }


      os = dest.writeFile(pathIdx, monitor, wt + "..idx");
      try {
        os = new SafeBufferedOutputStream(os);
        writer.writeIndex(os);
      } finally {
        os.close();
      }


      // Record the pack at the start of the pack info list. This
      // way clients are likely to consult the newest pack first,
      // and discover the most recent objects there.
      //
      final ArrayList<String> infoPacks = new ArrayList<String>();
      infoPacks.add(packName);
      infoPacks.addAll(packNames.keySet());
      dest.writeInfoPacks(infoPacks);


    } catch (IOException err) {
      safeDelete(pathIdx);
      safeDelete(pathPack);


      throw new TransportException(uri, JGitText.get().cannotStoreObjects, err);
    } finally {
      writer.release();
    }
  }

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