@SuppressWarnings("rawtypes")
  public MongoRx observableAdapter(final Function<Observable, Observable> adapter) {
    this.adapter = toAdapter(requireNonNull(adapter, "Adapter is required."));
    return this;
  }
@SuppressWarnings("rawtypes")
  public MongoRx observableAdapter(final Function<Observable, Observable> adapter) {
    this.adapter = toAdapter(requireNonNull(adapter, "Adapter is required."));
    return this;
  }
@ SuppressWarnings ( "rawtypes" ) public MongoRx observableAdapter ( final Function < Observable , Observable > adapter ) { this . adapter = toAdapter ( requireNonNull ( adapter , "Adapter is required." ) ) ; return this ; }
Set a {@link ObservableAdapter} to the {@link MongoDatabase} created by this module.

@param adapter An {@link ObservableAdapter}.
@return This module.
Set a { @link ObservableAdapter } to the { @link MongoDatabase } created by this module .