core/src/main/java/com/orientechnologies/orient/core/Orient.java
public OEngine getEngine(final String engineName) {
    engineLock.readLock().lock();
    try {
      return engines.get(engineName);
    } finally {
      engineLock.readLock().unlock();
    }
  }
public OEngine getEngine(final String engineName) {
    engineLock.readLock().lock();
    try {
      return engines.get(engineName);
    } finally {
      engineLock.readLock().unlock();
    }
  }
Returns the engine by its name.

@param engineName Engine name to retrieve

@return OEngine instance of found, otherwise null