net.timewalker.ffmq4.storage.data

Interface LinkedDataStore

All Superinterfaces:

DataStore

All Known Implementing Classes:

AbstractBlockBasedDataStore, AbstractDataStore, BlockBasedDataStore, InMemoryLinkedDataStore, JournalingBlockBasedDataStore

public interface LinkedDataStore
extends DataStore

LinkedDataStore

Method Summary

Modifier and Type	Method and Description
int	delete(int handle) Delete data associated to the given handle from the store
int	first() Get the first data handle stored
void	init() Initialize the data store
boolean	isLocked(int handle) Check if the data associated with a given handle is locked
void	lock(int handle) Lock the data associated to a given handle
int	next(int handle) Get the next data handle after the given one
int	previous(int handle) Get the previous data handle after the given one
int	replace(int handle, Object obj) Replace data in the store at the given position
Object	retrieve(int handle) Retrieve the data associated to a given handle
int	store(Object obj, int previousHandle) Put some data under in the store after the previous handle data
void	unlock(int handle) Unlock the data associated to a given handle

Methods inherited from interface net.timewalker.ffmq4.storage.data.DataStore

close, commitChanges, commitChanges, getAbsoluteStoreUsage, getStoreUsage, size

Method Detail

init

void init()
   throws DataStoreException

Initialize the data store

Throws:

DataStoreException

first

int first()
   throws DataStoreException

Get the first data handle stored

Returns:

the first entry handle or -1 if the store is empty

Throws:

DataStoreException

next

int next(int handle)
  throws DataStoreException

Get the next data handle after the given one

Parameters:

handle - block handle

Returns:

the next entry handle or -1 if their is no successor

Throws:

DataStoreException

previous

int previous(int handle)
      throws DataStoreException

Get the previous data handle after the given one

Parameters:

handle - block handle

Returns:

the previous entry handle or -1 if their is no predecessor

Throws:

DataStoreException

store

int store(Object obj,
          int previousHandle)
   throws DataStoreException

Put some data under in the store after the previous handle data

Parameters:

previousHandle - previous entry handle, use 0 if the store is empty

Throws:

DataStoreException

replace

int replace(int handle,
            Object obj)
     throws DataStoreException

Replace data in the store at the given position

Parameters:

handle - message handle

obj - the message to store

Throws:

DataStoreException

retrieve

Object retrieve(int handle)
         throws DataStoreException

Retrieve the data associated to a given handle

Throws:

DataStoreException - on storage error or invalid handle

delete

int delete(int handle)
    throws DataStoreException

Delete data associated to the given handle from the store

Returns:

the previous handle or -1

Throws:

DataStoreException - on storage error or invalid handle

lock

void lock(int handle)
   throws DataStoreException

Lock the data associated to a given handle

Throws:

DataStoreException - on storage error or invalid handle

unlock

void unlock(int handle)
     throws DataStoreException

Unlock the data associated to a given handle

Throws:

DataStoreException - on storage error or invalid handle

isLocked

boolean isLocked(int handle)
          throws DataStoreException

Check if the data associated with a given handle is locked

Throws:

DataStoreException - on storage error or invalid handle