https://github.com/FasterXML/jackson-core: Core Jackson processing abstractions (aka Streaming API), implementation for JSON (FasterXML)
  • Tatu Saloranta
  • Christopher Currie
  • Paul Brown 
Package that contains abstractions needed to support optional non-blocking decoding (parsing) functionality. Although parsers are constructed normally via JsonFactory (and are, in fact, sub-types of JsonParser), the way input is provided differs. 
Since:2.9
/**
 * Package that contains abstractions needed to support optional
 * non-blocking decoding (parsing) functionality.
 * Although parsers are constructed normally via
 * {@link com.fasterxml.jackson.core.JsonFactory}
 * (and are, in fact, sub-types of {@link com.fasterxml.jackson.core.JsonParser}),
 * the way input is provided differs.
 *
 * @since 2.9
 */

package com.fasterxml.jackson.core.async;