Package net.timewalker.ffmq4.storage.data.impl

Class InMemoryLinkedDataStore

java.lang.Object

net.timewalker.ffmq4.storage.data.impl.AbstractDataStore

net.timewalker.ffmq4.storage.data.impl.InMemoryLinkedDataStore

All Implemented Interfaces:

DataStore, LinkedDataStore

public final class InMemoryLinkedDataStore
extends AbstractDataStore

InMemoryLinkedObjectStore

Field Summary

Fields inherited from class net.timewalker.ffmq4.storage.data.impl.AbstractDataStore

locks, SAFE_MODE

Constructor Summary

Constructors

Constructor	Description
InMemoryLinkedDataStore(String name, int initialSize, int maxSize)	Constructor

Method Summary

Modifier and Type	Method	Description
protected void	checkHandle(int handle)	Check handle validity
void	close()	Close the store releasing associated system resources
void	commitChanges()	Ensure everything's persisted (synchronous)
void	commitChanges(SynchronizationBarrier barrier)	Ensure everything's persisted (asynchronous)
int	delete(int handle)	Delete data associated to the given handle from the store
int	first()	Get the first data handle stored
int	getAbsoluteStoreUsage()	Get the absolute store usage amount (%) (Ratio of used space over maximum allocatable space)
int	getStoreUsage()	Get the store usage amount (%) (Ratio of used space over currently allocated space)
void	init()	Initialize the data store
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	size()	Get the number of entries in the store
int	store(Object obj, int previousHandle)	Put some data under in the store after the previous handle data
String	toString()

Methods inherited from class net.timewalker.ffmq4.storage.data.impl.AbstractDataStore

isLocked, lock, unlock

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

InMemoryLinkedDataStore

public InMemoryLinkedDataStore(String name,
                               int initialSize,
                               int maxSize)

Constructor

Method Detail

init

public void init()
          throws DataStoreException

Description copied from interface: LinkedDataStore

Initialize the data store

Throws:

DataStoreException

checkHandle

protected void checkHandle(int handle)
                    throws DataStoreException

Description copied from class: AbstractDataStore

Check handle validity

Specified by:

checkHandle in class AbstractDataStore

Throws:

DataStoreException

retrieve

public Object retrieve(int handle)
                throws DataStoreException

Description copied from interface: LinkedDataStore

Retrieve the data associated to a given handle

Throws:

DataStoreException - on storage error or invalid handle

replace

public int replace(int handle,
                   Object obj)
            throws DataStoreException

Description copied from interface: LinkedDataStore

Replace data in the store at the given position

Parameters:

handle - message handle

obj - the message to store

Throws:

DataStoreException

store

public int store(Object obj,
                 int previousHandle)
          throws DataStoreException

Description copied from interface: LinkedDataStore

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

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

Throws:

DataStoreException

delete

public int delete(int handle)
           throws DataStoreException

Description copied from interface: LinkedDataStore

Delete data associated to the given handle from the store

Returns:

the previous handle or -1

Throws:

DataStoreException - on storage error or invalid handle

first

public int first()
          throws DataStoreException

Description copied from interface: LinkedDataStore

Get the first data handle stored

Returns:

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

Throws:

DataStoreException

next

public int next(int handle)
         throws DataStoreException

Description copied from interface: LinkedDataStore

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

public int previous(int handle)
             throws DataStoreException

Description copied from interface: LinkedDataStore

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

size

public int size()

Description copied from interface: DataStore

Get the number of entries in the store

commitChanges

public void commitChanges(SynchronizationBarrier barrier)
                   throws DataStoreException

Description copied from interface: DataStore

Ensure everything's persisted (asynchronous)

Throws:

DataStoreException

commitChanges

public void commitChanges()
                   throws DataStoreException

Description copied from interface: DataStore

Ensure everything's persisted (synchronous)

Throws:

DataStoreException

close

public void close()

Description copied from interface: DataStore

Close the store releasing associated system resources

getStoreUsage

public int getStoreUsage()

Description copied from interface: DataStore

Get the store usage amount (%) (Ratio of used space over currently allocated space)

getAbsoluteStoreUsage

public int getAbsoluteStoreUsage()

Description copied from interface: DataStore

Get the absolute store usage amount (%) (Ratio of used space over maximum allocatable space)

toString

public String toString()

Overrides:

toString in class Object