org.helidb.impl.simple
Class SimpleDatabase<K,V,P>

java.lang.Object
  org.helidb.impl.AbstractDatabase<K,V,P>
      org.helidb.impl.simple.SimpleDatabase<K,V,P>

Type Parameters:

K - The type of the keys in the database.

V - The type of the values in the database.

P - The type of positions used by the DatabaseBackend to locate records.

All Implemented Interfaces:

Iterable<Record<K,V>>, Map<K,V>, Database<K,V>

public class SimpleDatabase<K,V,P>
extends AbstractDatabase<K,V,P>

This is a simple implementation of Database. It does not support transactions.

This database implementation is not thread safe. If it is to be used concurrently from several threads, the client must use external synchronization.

Since:

1.0

Author:

Karl Gustafsson

In_jar:

helidb-core

Nested Class Summary

Nested classes/interfaces inherited from interface java.util.Map

Map.Entry<K,V>

Constructor Summary

SimpleDatabase(DatabaseBackend<K,V,P> b, LogAdapterHolder lah)
Create a new database frontend.

Method Summary

protected void	closeBackend() Subclasses implement this to call close on the backend.
protected DatabaseBackend<K,V,P>	getBackendForReading() Subclasses implement this to return a backend object that can be used for reading data.
protected DatabaseBackend<K,V,P>	getBackendForWriting() Subclasses implement this to return a backend object that can be used for writing data to.

Methods inherited from class org.helidb.impl.AbstractDatabase

assertNotClosed, clear, close, compact, containsKey, containsValue, delete, entrySet, equals, fasterInsert, find, find, find, firstRecord, get, getLogAdapterHolder, hashCode, insert, insertOrUpdate, isClosed, isEmpty, iterator, keyIterator, keySet, lastRecord, put, putAll, remove, size, update, valueIterator, values

Methods inherited from class java.lang.Object

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

Constructor Detail

SimpleDatabase

public SimpleDatabase(DatabaseBackend<K,V,P> b,
                      LogAdapterHolder lah)

Create a new database frontend.

Parameters:

b - The backend.

lah - A log adapter holder.

Method Detail

getBackendForReading

protected DatabaseBackend<K,V,P> getBackendForReading()

Description copied from class: AbstractDatabase

Subclasses implement this to return a backend object that can be used for reading data. Transactional database implementations make sure to join the current transaction, if the database has not already joined.

Specified by:

getBackendForReading in class AbstractDatabase<K,V,P>

Returns:

A backend object for reading data from.

getBackendForWriting

protected DatabaseBackend<K,V,P> getBackendForWriting()

Description copied from class: AbstractDatabase

Subclasses implement this to return a backend object that can be used for writing data to. Transactional database implementations make sure to join the current transaction, if the database has not already joined.

Specified by:

getBackendForWriting in class AbstractDatabase<K,V,P>

Returns:

A backend object for writing data to.

closeBackend

protected void closeBackend()

Description copied from class: AbstractDatabase

Subclasses implement this to call close on the backend. This is called by AbstractDatabase.close().

Specified by:

closeBackend in class AbstractDatabase<K,V,P>