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Java Source Code / Java Documentation » Database ORM » db ojb » org.apache.ojb.broker.locking

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Class Diagram

Java Document (Java Doc)

org.apache.ojb.broker.locking .IsolationLevels

All known Subclasses:   org.apache.ojb.broker.metadata .DescriptorRepository,  org.apache.ojb.broker.metadata .ConnectionDescriptorXmlHandler,  org.apache.ojb.broker.ant .RepositoryVerifierHandler,  org.apache.ojb.broker.metadata .RepositoryXmlHandler,  org.apache.ojb.broker.metadata .ClassDescriptor,
IsolationLevels
public interface IsolationLevels (Code)
This interface defines the lock isolation level constants used by OJB locking api. It contains numeric constants and literal constants representing all known isolation levels.
NOTE: The lock isolation levels are labeled like the database transaction level but the definition of the levels is different - take care of that.
version:
   $Id: IsolationLevels.java,v 1.1.2.3 2005/12/21 22:25:32 tomdz Exp $

Field Summary
final public static int IL_DEFAULT
     Numeric constant representing the default isolation level used by OJB - current used default level is IsolationLevels.IL_READ_UNCOMMITTED .
final public static int IL_NONE
     Numeric constant representing an no-op isolation level.
final public static int IL_OPTIMISTIC
     Numeric constant representing the optimistic locking isolation level.
The lock manager does not perform any pessimistic locking action.
final public static int IL_READ_COMMITTED
     Numeric constant representing the commited read isolation level.
final public static int IL_READ_UNCOMMITTED
     Numeric constant representing the uncommited read isolation level.
Obtaining two concurrent write locks on a given object is not allowed.
final public static int IL_REPEATABLE_READ
     Numeric constant representing the repeatable read isolation level.
final public static int IL_SERIALIZABLE
     Numeric constant representing the serializable transactions isolation level.
final public static String LITERAL_IL_NONE
     Literal constant representing the uncommited read isolation level.
final public static String LITERAL_IL_OPTIMISTIC
     Literal constant representing the optimistic locking isolation level.
final public static String LITERAL_IL_READ_COMMITTED
     Literal constant representing the commited read isolation level.
final public static String LITERAL_IL_READ_UNCOMMITTED
     Literal constant representing the uncommited read isolation level.
final public static String LITERAL_IL_REPEATABLE_READ
     Literal constant representing the repeatable read isolation level.
final public static String LITERAL_IL_SERIALIZABLE
     Literal constant representing the serializable transactions isolation level.

Field Detail
IL_DEFAULT
final public static int IL_DEFAULT(Code)
Numeric constant representing the default isolation level used by OJB - current used default level is IsolationLevels.IL_READ_UNCOMMITTED .

IL_NONE
final public static int IL_NONE(Code)
Numeric constant representing an no-op isolation level.
The lock manager completely ignores locking.
Allows:
all possible concurrent side-effects

IL_OPTIMISTIC
final public static int IL_OPTIMISTIC(Code)
Numeric constant representing the optimistic locking isolation level.
The lock manager does not perform any pessimistic locking action. Normally it's not needed to declare this isolation level in persistent object metadata, because OJB will automatically detect an enabled optimistic locking.
NOTE: Usage of this isolation level needs an specific optimistic locking declaration for the specified object. This declaration is not automatically handled by OJB and need setting of configuration properties - see OJB docs.

IL_READ_COMMITTED
final public static int IL_READ_COMMITTED(Code)
Numeric constant representing the commited read isolation level.
Obtaining two concurrent write locks on a given object is not allowed. Obtaining read locks is allowed only if there is no write lock on the given object.
Allows:
Non-Repeatable Reads
Phantom Reads

IL_READ_UNCOMMITTED
final public static int IL_READ_UNCOMMITTED(Code)
Numeric constant representing the uncommited read isolation level.
Obtaining two concurrent write locks on a given object is not allowed. Obtaining read locks is allowed even if another transaction is writing to that object (Thats why this level is also called "dirty reads").
Allows:
Dirty Reads
Non-Repeatable Reads
Phantom Reads

IL_REPEATABLE_READ
final public static int IL_REPEATABLE_READ(Code)
Numeric constant representing the repeatable read isolation level.
As commited reads, but obtaining a write lock on an object that has been locked for reading by another transaction is not allowed.
Allows:
Phantom Reads

IL_SERIALIZABLE
final public static int IL_SERIALIZABLE(Code)
Numeric constant representing the serializable transactions isolation level.
As Repeatable Reads, but it is even not allowed to have multiple read locks on a given object.
Allows:
-

LITERAL_IL_NONE
final public static String LITERAL_IL_NONE(Code)
Literal constant representing the uncommited read isolation level.

LITERAL_IL_OPTIMISTIC
final public static String LITERAL_IL_OPTIMISTIC(Code)
Literal constant representing the optimistic locking isolation level.

LITERAL_IL_READ_COMMITTED
final public static String LITERAL_IL_READ_COMMITTED(Code)
Literal constant representing the commited read isolation level.

LITERAL_IL_READ_UNCOMMITTED
final public static String LITERAL_IL_READ_UNCOMMITTED(Code)
Literal constant representing the uncommited read isolation level.

LITERAL_IL_REPEATABLE_READ
final public static String LITERAL_IL_REPEATABLE_READ(Code)
Literal constant representing the repeatable read isolation level.

LITERAL_IL_SERIALIZABLE
final public static String LITERAL_IL_SERIALIZABLE(Code)
Literal constant representing the serializable transactions isolation level.

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