io.permazen

Enum SessionMode

java.lang.Object

java.lang.Enum<SessionMode>

io.permazen.SessionMode

All Implemented Interfaces:

Serializable, Comparable<SessionMode>

public enum SessionMode
extends Enum<SessionMode>

Session modes.

The three SessionMode values correspond to the three layers of abstraction in Permazen. In order from bottom to top these are:

• The key/value database layer, providing KVDatabase and KVTransaction and represented by KEY_VALUE
• The core API database layer, providing Database and Transaction and represented by CORE_API
• The Permazen Java layer, providing Permazen and JTransaction and represented by PERMAZEN

Enum Constant Summary

Enum Constants

Enum Constant and Description
CORE_API Permazen Core API mode.
KEY_VALUE Permazen key/value database mode.
PERMAZEN Permazen Java mode.

Method Summary

Modifier and Type	Method and Description
boolean	hasCoreAPI() Determine whether the core API (e.g., Transaction) is available in this mode.
boolean	hasPermazen() Determine whether the Permazen Java API (e.g., JTransaction) based on a Permazen instance is available in this mode.
static SessionMode	valueOf(String name) Returns the enum constant of this type with the specified name.
static SessionMode[]	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

KEY_VALUE

public static final SessionMode KEY_VALUE

Permazen key/value database mode.

This is the lowest level CLI mode, where only the raw byte[] key/value store is available. This mode provides a KVTransaction, but no Transaction or JTransaction.

See Also:

io.permazen.kv

CORE_API

public static final SessionMode CORE_API

Permazen Core API mode.

Supports access to low level schema information, core API "objects" and fields, but no Java-specific operations. This mode provides a KVTransaction and Transaction, but no JTransaction.

Schema information may be provided either by a schema XML file or by @PermazenType-annotated Java model classes; however, in the latter case these classes will be otherwise ignored.

In this mode, database objects are represented by ObjId's and enum values by EnumValue's.

PERMAZEN

public static final SessionMode PERMAZEN

Permazen Java mode.

Provides database access through standard Java model objects and transaction access via JTransaction. Requires and provides a Permazen instance and its associated Java model classes.

In this mode, database objects are represented by Java model class instances and enum values by corresponding Java model Enum class instances.

Method Detail

values

public static SessionMode[] 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 (SessionMode c : SessionMode.values())
    System.out.println(c);

Returns:

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

valueOf

public static SessionMode 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

hasPermazen

public boolean hasPermazen()

Determine whether the Permazen Java API (e.g., JTransaction) based on a Permazen instance is available in this mode.

Returns:

true if the Permazen Java API is available

hasCoreAPI

public boolean hasCoreAPI()

Determine whether the core API (e.g., Transaction) is available in this mode.

Returns:

true if the core API is available