com.caplin.transformer.module.persistence

Interface Persistence

All Known Implementing Classes:

PersistenceImpl

public interface Persistence

Interface defining the methods for storing and retrieving values from the Transformers persistence store

Method Summary

Methods

Modifier and Type	Method and Description
void	addChangeListener(String prefix, PersistenceChangeListener listener) Register a change listener with transformers persistence module.
void	delete(String key) Delete a key from the database
PersistedValue	get(String key) Retreive a from Transformers persistence store
void	put(PersistedValue persistedValue) Store a value, multiple puts with the same key will override previously stored values
PersistedValue[]	query(String query) Query for all entries whose keys start with the query

Method Detail

put

void put(PersistedValue persistedValue)

Store a value, multiple puts with the same key will override previously stored values

Parameters:

persistedValue - value to be stored

get

PersistedValue get(String key)

Retreive a from Transformers persistence store

Parameters:

key - The key associated with the entry

Returns:

The persisted value if it exists, null otherwise

query

PersistedValue[] query(String query)

Query for all entries whose keys start with the query

Parameters:

query - prefix to query for

Returns:

Array of PersistedValue objects. Never null

delete

void delete(String key)

Delete a key from the database

Parameters:

key - Key to delete

addChangeListener

void addChangeListener(String prefix,
                     PersistenceChangeListener listener)

Register a change listener with transformers persistence module. Will only get called if the change originates on either another cluster node or a monitoring module

Parameters:

prefix - Prefix of keys we're interested in

listener - Object to be called when data changes