How to use

org.eclipse.jgit.storage.dht.Prefetcher

constructor

private Prefetcher prefetch(final int type, final int ratio) {
  int limit = readerOptions.getChunkLimit();
  int prefetchLimit = (int) (limit * (ratio / 100.0));
  recentChunks.setMaxBytes(limit - prefetchLimit);
  return new Prefetcher(this, type, prefetchLimit);
}

private Prefetcher prefetch(final int type, final int ratio) {
  int limit = readerOptions.getChunkLimit();
  int prefetchLimit = (int) (limit * (ratio / 100.0));
  recentChunks.setMaxBytes(limit - prefetchLimit);
  return new Prefetcher(this, type, prefetchLimit);
}

  private void init() throws IOException {
    ObjectWithInfo<T> c;

    while ((c = nextObjectWithInfo()) != null) {
      ChunkKey chunkKey = c.chunkKey;
      Collection<ObjectWithInfo<T>> list = byChunk.get(chunkKey);
      if (list == null) {
        list = new ArrayList<ObjectWithInfo<T>>();
        byChunk.put(chunkKey, list);

        if (prefetcher == null) {
          int limit = reader.getOptions().getChunkLimit();
          int ratio = reader.getOptions().getOpenQueuePrefetchRatio();
          int prefetchLimit = (int) (limit * (ratio / 100.0));
          reader.getRecentChunks().setMaxBytes(limit - prefetchLimit);
          prefetcher = new Prefetcher(reader, 0, prefetchLimit);
        }
        prefetcher.push(chunkKey);
      }
      list.add(c);
    }

    chunkItr = byChunk.values().iterator();
  }
}

  private void init() throws IOException {
    ObjectWithInfo<T> c;

    while ((c = nextObjectWithInfo()) != null) {
      ChunkKey chunkKey = c.chunkKey;
      Collection<ObjectWithInfo<T>> list = byChunk.get(chunkKey);
      if (list == null) {
        list = new ArrayList<ObjectWithInfo<T>>();
        byChunk.put(chunkKey, list);

        if (prefetcher == null) {
          int limit = reader.getOptions().getChunkLimit();
          int ratio = reader.getOptions().getOpenQueuePrefetchRatio();
          int prefetchLimit = (int) (limit * (ratio / 100.0));
          reader.getRecentChunks().setMaxBytes(limit - prefetchLimit);
          prefetcher = new Prefetcher(reader, 0, prefetchLimit);
        }
        prefetcher.push(chunkKey);
      }
      list.add(c);
    }

    chunkItr = byChunk.values().iterator();
  }
}

void copyAsIs(PackOutputStream out, boolean validate, DhtReader ctx)
    throws IOException {
  if (keyList == null)
    init();
  // Clear the recent chunks because all of the reader's
  // chunk limit should be made available for prefetch.
  int cacheLimit = ctx.getOptions().getChunkLimit();
  ctx.getRecentChunks().setMaxBytes(0);
  try {
    Prefetcher p = new Prefetcher(ctx, 0, cacheLimit);
    p.push(Arrays.asList(keyList));
    copyPack(out, p, validate);
  } finally {
    ctx.getRecentChunks().setMaxBytes(cacheLimit);
  }
}

void copyAsIs(PackOutputStream out, boolean validate, DhtReader ctx)
    throws IOException {
  if (keyList == null)
    init();
  // Clear the recent chunks because all of the reader's
  // chunk limit should be made available for prefetch.
  int cacheLimit = ctx.getOptions().getChunkLimit();
  ctx.getRecentChunks().setMaxBytes(0);
  try {
    Prefetcher p = new Prefetcher(ctx, 0, cacheLimit);
    p.push(Arrays.asList(keyList));
    copyPack(out, p, validate);
  } finally {
    ctx.getRecentChunks().setMaxBytes(cacheLimit);
  }
}