org.apache.hadoop.tools.rumen.state

Class StatePool

java.lang.Object

org.apache.hadoop.tools.rumen.state.StatePool

public class StatePool
extends Object

A pool of states. States used by DataType's can be managed the StatePool. StatePool also supports persistence. Persistence is key to share states across multiple Anonymizer runs.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	StatePool.StatePair A wrapper class that binds the state implementation to its implementing class name.

Field Summary

Fields

Modifier and Type	Field and Description
static String	DIR_CONFIG
static String	PERSIST_CONFIG
static String	RELOAD_CONFIG

Constructor Summary

Constructors

Constructor and Description
StatePool()

Method Summary

Modifier and Type	Method and Description
void	addState(Class id, State state)
State	getState(Class clazz)
HashMap<String,StatePool.StatePair>	getStates() To be invoked only by the Jackson JSON serializer.
long	getVersion() To be invoked only by the Jackson JSON serializer.
void	initialize(org.apache.hadoop.conf.Configuration conf) Initialized the StatePool.
boolean	isUpdated()
void	persist() Persists the current state to the state directory.
void	setStates(HashMap<String,StatePool.StatePair> states) To be invoked only by the Jackson JSON deserializer.
void	setVersion(long version) To be invoked only by the Jackson JSON deserializer.

Methods inherited from class java.lang.Object

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

Field Detail

DIR_CONFIG

public static final String DIR_CONFIG

See Also:

Constant Field Values

RELOAD_CONFIG

public static final String RELOAD_CONFIG

See Also:

Constant Field Values

PERSIST_CONFIG

public static final String PERSIST_CONFIG

See Also:

Constant Field Values

Constructor Detail

StatePool

public StatePool()

Method Detail

addState

public void addState(Class id,
                     State state)

getState

public State getState(Class clazz)

isUpdated

public boolean isUpdated()

initialize

public void initialize(org.apache.hadoop.conf.Configuration conf)
                throws Exception

Initialized the StatePool. This API also reloads the previously persisted state. Note that the StatePool should be initialized only once.

Throws:

Exception

persist

public void persist()
             throws IOException

Persists the current state to the state directory. The state will be persisted to the 'latest' file in the state directory.

Throws:

IOException

getVersion

public long getVersion()

To be invoked only by the Jackson JSON serializer.

setVersion

public void setVersion(long version)

To be invoked only by the Jackson JSON deserializer.

getStates

public HashMap<String,StatePool.StatePair> getStates()

To be invoked only by the Jackson JSON serializer.

setStates

public void setStates(HashMap<String,StatePool.StatePair> states)

To be invoked only by the Jackson JSON deserializer.