PersistentJournalKind Class Reference

Sets the journal mode of the persistent storage. More...

Inheritance diagram for PersistentJournalKind:

Static Public Attributes
static final PersistentJournalKind	TRUNCATE_PERSISTENT_JOURNAL
	Commits transactions by truncating the rollback journal to zero-length instead of deleting it. More...
static final PersistentJournalKind	PERSIST_PERSISTENT_JOURNAL
	Prevents the rollback journal from being deleted at the end of each transaction. Instead, the header of the journal is overwritten with zeros. More...
static final PersistentJournalKind	MEMORY_PERSISTENT_JOURNAL
	Stores the rollback journal in volatile RAM. This saves disk I/O. More...
static final PersistentJournalKind	WAL_PERSISTENT_JOURNAL
	Uses a write-ahead log instead of a rollback journal to implement transactions. More...
static final PersistentJournalKind	OFF_PERSISTENT_JOURNAL
	Completely disables the rollback journal. If the application crashes in the middle of a transaction when the OFF journaling mode is set, the persistent storage will very likely be corrupted. More...

Additional Inherited Members
Public Member Functions inherited from Enum
final int	ordinal ()
	The integral value of this enumerated constant. More...
Object	copy_from (Object src)
final String	name ()
	The name of this enum constant, as declared in the enum declaration. More...
final String	toString ()
	The string value of this enum constant. More...
Object	copy_from (Object src)
	Copy value of a data type from source. More...
Protected Member Functions inherited from Enum
	Enum (String name, int ordinal)
	The constructor. More...
final Object	clone () throws CloneNotSupportedException

Detailed Description

Sets the journal mode of the persistent storage.

The rollback journal is used in SQLite to store the state of the persistent storage before a transaction is committed.

QoS:

com.rti.dds.infrastructure.DurabilityQosPolicy

Member Data Documentation

TRUNCATE_PERSISTENT_JOURNAL

final PersistentJournalKind TRUNCATE_PERSISTENT_JOURNAL

static

Initial value:

=
            new PersistentJournalKind("TRUNCATE_PERSISTENT_JOURNAL", 1)

Commits transactions by truncating the rollback journal to zero-length instead of deleting it.

PERSIST_PERSISTENT_JOURNAL

final PersistentJournalKind PERSIST_PERSISTENT_JOURNAL

static

Initial value:

=
            new PersistentJournalKind("PERSIST_PERSISTENT_JOURNAL", 2)

Prevents the rollback journal from being deleted at the end of each transaction. Instead, the header of the journal is overwritten with zeros.

MEMORY_PERSISTENT_JOURNAL

final PersistentJournalKind MEMORY_PERSISTENT_JOURNAL

static

Initial value:

=
            new PersistentJournalKind("MEMORY_PERSISTENT_JOURNAL", 3)

Stores the rollback journal in volatile RAM. This saves disk I/O.

WAL_PERSISTENT_JOURNAL

final PersistentJournalKind WAL_PERSISTENT_JOURNAL

static

Initial value:

=
            new PersistentJournalKind("WAL_PERSISTENT_JOURNAL", 4)

Uses a write-ahead log instead of a rollback journal to implement transactions.

OFF_PERSISTENT_JOURNAL

final PersistentJournalKind OFF_PERSISTENT_JOURNAL

static

Initial value:

=
            new PersistentJournalKind("OFF_PERSISTENT_JOURNAL", 5)

Completely disables the rollback journal. If the application crashes in the middle of a transaction when the OFF journaling mode is set, the persistent storage will very likely be corrupted.