org.h2.mvstore.db

Class TransactionStore.Transaction

java.lang.Object

org.h2.mvstore.db.TransactionStore.Transaction

Enclosing class:

TransactionStore

public static class TransactionStore.Transaction
extends java.lang.Object

A transaction.

Field Summary

Fields

Modifier and Type	Field and Description
static int	STATUS_CLOSED The status of a closed transaction (committed or rolled back).
static int	STATUS_COMMITTING The status of a transaction that is being committed, but possibly not yet finished.
static int	STATUS_OPEN The status of an open transaction.
static int	STATUS_PREPARED The status of a prepared transaction.

Method Summary

Modifier and Type	Method and Description
void	commit() Commit the transaction.
java.util.Iterator<TransactionStore.Change>	getChanges(long savepointId) Get the list of changes, starting with the latest change, up to the given savepoint (in reverse order than they occurred).
int	getId()
java.lang.String	getName()
int	getStatus()
<K,V> TransactionStore.TransactionMap<K,V>	openMap(MVMap<K,org.h2.mvstore.db.TransactionStore.VersionedValue> map) Open the transactional version of the given map.
<K,V> TransactionStore.TransactionMap<K,V>	openMap(java.lang.String name) Open a data map.
<K,V> TransactionStore.TransactionMap<K,V>	openMap(java.lang.String name, DataType keyType, DataType valueType) Open the map to store the data.
void	prepare() Prepare the transaction.
<K,V> void	removeMap(TransactionStore.TransactionMap<K,V> map) Remove the map.
void	rollback() Roll the transaction back.
void	rollbackToSavepoint(long savepointId) Roll back to the given savepoint.
void	setName(java.lang.String name)
long	setSavepoint() Create a new savepoint.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

STATUS_CLOSED

public static final int STATUS_CLOSED

The status of a closed transaction (committed or rolled back).

See Also:

Constant Field Values

STATUS_OPEN

public static final int STATUS_OPEN

The status of an open transaction.

See Also:

Constant Field Values

STATUS_PREPARED

public static final int STATUS_PREPARED

The status of a prepared transaction.

See Also:

Constant Field Values

STATUS_COMMITTING

public static final int STATUS_COMMITTING

The status of a transaction that is being committed, but possibly not yet finished. A transactions can go into this state when the store is closed while the transaction is committing. When opening a store, such transactions should be committed.

See Also:

Constant Field Values

Method Detail

getId

public int getId()

getStatus

public int getStatus()

setName

public void setName(java.lang.String name)

getName

public java.lang.String getName()

setSavepoint

public long setSavepoint()

Create a new savepoint.

Returns:

the savepoint id

openMap

public <K,V> TransactionStore.TransactionMap<K,V> openMap(java.lang.String name)

Open a data map.

Type Parameters:

K - the key type

V - the value type

Parameters:

name - the name of the map

Returns:

the transaction map

openMap

public <K,V> TransactionStore.TransactionMap<K,V> openMap(java.lang.String name,
                                                          DataType keyType,
                                                          DataType valueType)

Open the map to store the data.

Type Parameters:

K - the key type

V - the value type

Parameters:

name - the name of the map

keyType - the key data type

valueType - the value data type

Returns:

the transaction map

openMap

public <K,V> TransactionStore.TransactionMap<K,V> openMap(MVMap<K,org.h2.mvstore.db.TransactionStore.VersionedValue> map)

Open the transactional version of the given map.

Type Parameters:

K - the key type

V - the value type

Parameters:

map - the base map

Returns:

the transactional map

prepare

public void prepare()

Prepare the transaction. Afterwards, the transaction can only be committed or rolled back.

commit

public void commit()

Commit the transaction. Afterwards, this transaction is closed.

rollbackToSavepoint

public void rollbackToSavepoint(long savepointId)

Roll back to the given savepoint. This is only allowed if the transaction is open.

Parameters:

savepointId - the savepoint id

rollback

public void rollback()

Roll the transaction back. Afterwards, this transaction is closed.

getChanges

public java.util.Iterator<TransactionStore.Change> getChanges(long savepointId)

Get the list of changes, starting with the latest change, up to the given savepoint (in reverse order than they occurred). The value of the change is the value before the change was applied.

Parameters:

savepointId - the savepoint id, 0 meaning the beginning of the transaction

Returns:

the changes

removeMap

public <K,V> void removeMap(TransactionStore.TransactionMap<K,V> map)

Remove the map.

Parameters:

map - the map

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object