ProcedureStore (Apache HBase 1.2.12 API)

All Known Implementing Classes:

NoopProcedureStore, ProcedureStoreBase, WALProcedureStore
```
@InterfaceAudience.Private
@InterfaceStability.Evolving
public interface ProcedureStore
```
The ProcedureStore is used by the executor to persist the state of each procedure execution. This allows to resume the execution of pending/in-progress procedures in case of machine failure or service shutdown.

Nested Class Summary

Nested Classes
Modifier and Type	Interface and Description
`static interface`	`ProcedureStore.ProcedureIterator` An Iterator over a collection of Procedure
`static interface`	`ProcedureStore.ProcedureLoader` Interface passed to the ProcedureStore.load() method to handle the store-load events.
`static interface`	`ProcedureStore.ProcedureStoreListener` Store listener interface.

Method Summary

Methods
Modifier and Type	Method and Description
`void`	`delete(long procId)` The specified procId was removed from the executor, due to completion, abort or failure.
`int`	`getNumThreads()`
`void`	`insert(Procedure proc, Procedure[] subprocs)` When a procedure is submitted to the executor insert(proc, null) will be called.
`boolean`	`isRunning()`
`void`	`load(ProcedureStore.ProcedureLoader loader)` Load the Procedures in the store.
`void`	`recoverLease()` Acquire the lease for the procedure store.
`void`	`registerListener(ProcedureStore.ProcedureStoreListener listener)` Add the listener to the notification list.
`void`	`start(int numThreads)` Start/Open the procedure store
`void`	`stop(boolean abort)` Stop/Close the procedure store
`boolean`	`unregisterListener(ProcedureStore.ProcedureStoreListener listener)` Remove the listener from the notification list.
`void`	`update(Procedure proc)` The specified procedure was executed, and the new state should be written to the store.

- Method Detail
  - registerListener
```
void registerListener(ProcedureStore.ProcedureStoreListener listener)
```
    Add the listener to the notification list.
    
    Parameters:
    listener - The AssignmentListener to register
  - unregisterListener
```
boolean unregisterListener(ProcedureStore.ProcedureStoreListener listener)
```
    Remove the listener from the notification list.
    
    Parameters:
    listener - The AssignmentListener to unregister
    
    Returns:
    true if the listner was in the list and it was removed, otherwise false.
  - start
```
void start(int numThreads)
           throws IOException
```
    Start/Open the procedure store
    
    Parameters:
    numThreads -
    
    Throws:
    
    IOException
  - stop
```
void stop(boolean abort)
```
    Stop/Close the procedure store
    
    Parameters:
    abort - true if the stop is an abort
  - isRunning
```
boolean isRunning()
```
    Returns:
    true if the store is running, otherwise false.
  - getNumThreads
```
int getNumThreads()
```
    Returns:
    the number of threads/slots passed to start()
  - recoverLease
```
void recoverLease()
                  throws IOException
```
    Acquire the lease for the procedure store.
    
    Throws:
    
    IOException
  - load
```
void load(ProcedureStore.ProcedureLoader loader)
          throws IOException
```
    Load the Procedures in the store.
    
    Parameters:
    loader - the ProcedureLoader that will handle the store-load events
    
    Throws:
    
    IOException
  - insert
```
void insert(Procedure proc,
          Procedure[] subprocs)
```
    When a procedure is submitted to the executor insert(proc, null) will be called. 'proc' has a 'RUNNABLE' state and the initial information required to start up. When a procedure is executed and it returns children insert(proc, subprocs) will be called. 'proc' has a 'WAITING' state and an update state. 'subprocs' are the children in 'RUNNABLE' state with the initial information.
    
    Parameters:
    proc - the procedure to serialize and write to the store.
    subprocs - the newly created child of the proc.
  - update
```
void update(Procedure proc)
```
    The specified procedure was executed, and the new state should be written to the store.
    
    Parameters:
    proc - the procedure to serialize and write to the store.
  - delete
```
void delete(long procId)
```
    The specified procId was removed from the executor, due to completion, abort or failure. The store implementor should remove all the information about the specified procId.
    
    Parameters:
    procId - the ID of the procedure to remove.

Interface ProcedureStore

Nested Class Summary

Method Summary

Method Detail

registerListener

unregisterListener

start

stop

isRunning

getNumThreads

recoverLease

load

insert

update

delete