private Runnable createSyncer()

in java/com/facebook/soloader/UnpackingSoSource.java [427:471]
35 lines of code
3 McCabe index (conditional complexity)

  private Runnable createSyncer(
      final FileLocker lock,
      final byte[] deps,
      final File stateFileName,
      final File depsFileName,
      final DsoManifest manifest,
      final Boolean quietly) {
    return new Runnable() {
      @Override
      public void run() {
        try {
          try {
            Log.v(TAG, "starting syncer worker");

            // N.B. We can afford to write the deps file and the manifest file without
            // synchronization or fsyncs because we've marked the DSO store STATE_DIRTY, which
            // will cause us to ignore all intermediate state when regenerating it.  That is,
            // it's okay for the depsFile or manifestFile blocks to hit the disk before the
            // actual DSO data file blocks as long as both hit the disk before we reset
            // STATE_CLEAN.

            try (RandomAccessFile depsFile = new RandomAccessFile(depsFileName, "rw")) {
              depsFile.write(deps);
              depsFile.setLength(depsFile.getFilePointer());
            }

            File manifestFileName = new File(soDirectory, MANIFEST_FILE_NAME);
            try (RandomAccessFile manifestFile = new RandomAccessFile(manifestFileName, "rw")) {
              manifest.write(manifestFile);
            }

            SysUtil.fsyncRecursive(soDirectory);
            writeState(stateFileName, STATE_CLEAN);
          } finally {
            Log.v(TAG, "releasing dso store lock for " + soDirectory + " (from syncer thread)");
            lock.close();
          }
        } catch (IOException ex) {
          if (!quietly) {
            throw new RuntimeException(ex);
          }
        }
      }
    };
  }