LockType (Jakarta EE Platform API)

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

All Methods Static Methods Concrete Methods
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