Package org.apache.storm.hooks
Interface IWorkerHook
- All Superinterfaces:
Serializable
- All Known Implementing Classes:
BaseWorkerHook
An IWorkerHook represents a topology component that can be executed when a worker starts, and when a worker shuts down. It can be useful
when you want to execute operations before topology processing starts, or cleanup operations before your workers shut down.
-
Method Summary
Modifier and TypeMethodDescriptionvoid
shutdown()
This method is called right before a worker shuts down.default void
start
(Map<String, Object> topoConf, WorkerTopologyContext context) Deprecated.default void
start
(Map<String, Object> topoConf, WorkerUserContext context) This method is called when a worker is started and can be used to do necessary prep-processing and allow initialization of shared application state.
-
Method Details
-
start
Deprecated.This method is called when a worker is started.- Parameters:
topoConf
- The Storm configuration for this workercontext
- This object can be used to get information about this worker's place within the topology
-
start
This method is called when a worker is started and can be used to do necessary prep-processing and allow initialization of shared application state.- Parameters:
topoConf
- The Storm configuration for this workercontext
- This object can be used to get information about this worker's place within the topology and exposesWorkerUserContext.setResource(String, Object)
to set the shared application state.
-
shutdown
void shutdown()This method is called right before a worker shuts down.
-
start(Map, WorkerUserContext)