code: public void setStateKeySelectors(KeySelector<IN1, ?> stateKeySelector1, KeySelector<IN2, ?> stateKeySelector2) {
  		this.stateKeySelector1 = stateKeySelector1;
  		this.stateKeySelector2 = stateKeySelector2;
  	}
docs: Sets the {@link KeySelector KeySelectors} that must be used for partitioning keyed state of
  this transformation.
  
  @param stateKeySelector1 The {@code KeySelector} to set for the first input
  @param stateKeySelector2 The {@code KeySelector} to set for the first input