public class InMemoryKeyValueState<K,V> extends Object implements KeyValueState<K,V>
An in-memory implementation of the State.
| Constructor and Description |
|---|
InMemoryKeyValueState() |
| Modifier and Type | Method and Description |
|---|---|
void |
commit()
Persist the current state.
|
void |
commit(long txid)
Commit a previously prepared transaction.
|
V |
delete(K key)
Deletes the value mapped to the key, if there is any.
|
V |
get(K key)
Returns the value mapped to the key.
|
V |
get(K key,
V defaultValue)
Returns the value mapped to the key or defaultValue if no mapping is found.
|
Iterator<Map.Entry<K,V>> |
iterator() |
void |
prepareCommit(long txid)
Invoked by the framework to prepare a transaction for commit.
|
void |
put(K key,
V value)
Maps the value with the key.
|
void |
rollback()
Rollback a prepared transaction to the previously committed state.
|
String |
toString() |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, waitforEach, spliteratorpublic void put(K key, V value)
KeyValueStateMaps the value with the key.
put in interface KeyValueState<K,V>key - the keyvalue - the valuepublic V get(K key)
KeyValueStateReturns the value mapped to the key.
get in interface KeyValueState<K,V>key - the keypublic V get(K key, V defaultValue)
KeyValueStateReturns the value mapped to the key or defaultValue if no mapping is found.
get in interface KeyValueState<K,V>key - the keydefaultValue - the value to return if no mapping is foundpublic V delete(K key)
KeyValueStateDeletes the value mapped to the key, if there is any.
delete in interface KeyValueState<K,V>key - the keypublic void commit()
StatePersist the current state. This is used when the component manages the state.
public void commit(long txid)
StateCommit a previously prepared transaction. It should be possible to retrieve a committed state later.
public void prepareCommit(long txid)
StateInvoked by the framework to prepare a transaction for commit. It should be possible to commit the prepared state later.
The same txid can be prepared again, but the next txid cannot be prepared when previous one is not yet committed.
prepareCommit in interface Statetxid - the transaction idpublic void rollback()
StateRollback a prepared transaction to the previously committed state.
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