Reactor 3 Reference Guide Advanced Features and Concepts Advanced Features and Concepts This chapter covers advanced features and concepts of Reactor, including the following: Mutualizing Operator Usage Hot Versus Cold Broadcasting to Multiple Subscribers with ConnectableFlux Three Sorts of Batching Parallelizing Work with ParallelFlux Replacing Default Schedulers Using Global Hooks Adding a Context to a Reactive Sequence Context-Propagation Support Null Safety Dealing with Objects that Need Cleanup Exposing Reactor metrics Mutualizing Operator Usage