Package jakarta.ejb

Enum LockType

java.lang.Object

java.lang.Enum<LockType>

jakarta.ejb.LockType

All Implemented Interfaces:

Serializable, Comparable<LockType>

public enum LockType
extends Enum<LockType>

Concurrency lock type for singleton beans with container-managed concurrency.

Since:

EJB 3.1

Enum Constant Summary

Enum Constants

Enum Constant	Description
READ	For read-only operations.
WRITE	For exclusive access to the bean instance.

Method Summary

Modifier and Type	Method	Description
static LockType	valueOf(String name)	Returns the enum constant of this type with the specified name.
static LockType[]	values()	Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

READ

public static final LockType READ

For read-only operations. Allows simultaneous access to methods designated as READ, as long as no WRITE lock is held.

WRITE

public static final LockType WRITE

For exclusive access to the bean instance. A WRITE lock can only be acquired when no other method with either a READ or WRITE lock is currently held.

Method Detail

values

public static LockType[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (LockType c : LockType.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static LockType valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum type has no constant with the specified name

NullPointerException - if the argument is null