Package org.datanucleus.store.valuegenerator

Class TimestampValueGenerator

java.lang.Object

org.datanucleus.store.valuegenerator.AbstractGenerator<Long>

org.datanucleus.store.valuegenerator.TimestampValueGenerator

All Implemented Interfaces:

ValueGenerator<Long>

public class TimestampValueGenerator
extends AbstractGenerator<Long>

Value generator for timestamp values (millisecs). The "timestamps" are the number of milliseconds (since Jan 1 1970).

Field Summary

Fields inherited from class org.datanucleus.store.valuegenerator.AbstractGenerator

allocationSize, block, initialValue, name, storeMgr

Fields inherited from interface org.datanucleus.store.valuegenerator.ValueGenerator

PROPERTY_CATALOG_NAME, PROPERTY_CLASS_NAME, PROPERTY_COLUMN_NAME, PROPERTY_FIELD_NAME, PROPERTY_KEY_CACHE_SIZE, PROPERTY_KEY_DATABASE_CACHE_SIZE, PROPERTY_KEY_INITIAL_VALUE, PROPERTY_KEY_MAX_VALUE, PROPERTY_KEY_MIN_VALUE, PROPERTY_ROOT_CLASS_NAME, PROPERTY_SCHEMA_NAME, PROPERTY_SEQUENCE_NAME, PROPERTY_SEQUENCETABLE_CATALOG, PROPERTY_SEQUENCETABLE_NAME_COLUMN, PROPERTY_SEQUENCETABLE_NEXTVAL_COLUMN, PROPERTY_SEQUENCETABLE_SCHEMA, PROPERTY_SEQUENCETABLE_TABLE, PROPERTY_TABLE_NAME

Constructor Summary

Constructors

Constructor	Description
TimestampValueGenerator(StoreManager storeMgr, String name)	Constructor.

Method Summary

Modifier and Type	Method	Description
static Class	getStorageClass()	Accessor for the storage class for values generated with this generator.
protected ValueGenerationBlock<Long>	reserveBlock(long size)	Method to reserve a block of values.

Methods inherited from class org.datanucleus.store.valuegenerator.AbstractGenerator

allocate, current, currentValue, getName, next, nextValue, obtainGenerationBlock, obtainGenerationBlock, reserveBlock

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

TimestampValueGenerator

public TimestampValueGenerator(StoreManager storeMgr,
                               String name)

Constructor.

Parameters:

storeMgr - StoreManager

name - Symbolic name of the generator

Method Detail

getStorageClass

public static Class getStorageClass()

Accessor for the storage class for values generated with this generator.

Returns:

Storage class (in this case Long.class)

reserveBlock

protected ValueGenerationBlock<Long> reserveBlock(long size)

Method to reserve a block of values. Only ever reserves a single timestamp, to the time at which it is created.

Specified by:

reserveBlock in class AbstractGenerator<Long>

Parameters:

size - Number of elements to reserve.

Returns:

The block.