one.edee.darwin

Class Darwin

java.lang.Object

one.edee.darwin.Darwin

All Implemented Interfaces:

org.springframework.beans.factory.Aware, org.springframework.beans.factory.InitializingBean, org.springframework.context.ApplicationContextAware

public class Darwin
extends Object
implements org.springframework.beans.factory.InitializingBean, org.springframework.context.ApplicationContextAware

Darwin allows you to automatically update your database layer structure. It tracks version of the data model that is currently available in your database and automatically applies patches as the component version grows with newer versions of your software.

In short it has following features:

- when there are no tables for your component, it uses create.sql script to setup them - when there exists data layer for your component, but newer version of the component starts up, it looks up for patches that fill the gap between current structure of data layer and structure that is expected for new version - when suddenly old patch appears (ie. data layer is in version 2.0 but patch_1.6.sql appears) it looks up whether it was applied and when not it tries to apply it ... this allows parallel development in several branches sharing the same database (assuming patches are not conflicting) - it recovers from errors in patch in a way that it stores information about SQL commands successfully executed so that when applying the same patch again (after it has been corrected by developer) it skips commands already executed and jumps straight to the one that failed last time

Author:

Jan Novotný, FG Forrest a.s. (c) 2007

Field Summary

Fields

Modifier and Type	Field and Description
static String	DARWIN_COMPONENT_NAME
static String	DARWIN_COMPONENT_VERSION

Constructor Summary

Constructors

Constructor and Description
Darwin()

Method Summary

Modifier and Type	Method and Description
void	afterPropertiesSet() Initializes Darwin and updates infrastructure tables for it.
void	evolve() Executes darwin instance logic.
void	initDefaults() This method will initializes default objects needed for autoupdating.
void	setApplicationContext(org.springframework.context.ApplicationContext applicationContext)

Methods inherited from class java.lang.Object

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

Field Detail

DARWIN_COMPONENT_NAME

public static final String DARWIN_COMPONENT_NAME

See Also:

Constant Field Values

DARWIN_COMPONENT_VERSION

public static final String DARWIN_COMPONENT_VERSION

See Also:

Constant Field Values

Constructor Detail

Darwin

public Darwin()

Method Detail

setApplicationContext

public void setApplicationContext(org.springframework.context.ApplicationContext applicationContext)
                           throws org.springframework.beans.BeansException

Specified by:

setApplicationContext in interface org.springframework.context.ApplicationContextAware

Throws:

org.springframework.beans.BeansException

evolve

public void evolve()

Executes darwin instance logic.

afterPropertiesSet

public void afterPropertiesSet()

Initializes Darwin and updates infrastructure tables for it. Must be called prior calling updateComponent(String, String)

Specified by:

afterPropertiesSet in interface org.springframework.beans.factory.InitializingBean

initDefaults

public void initDefaults()

This method will initializes default objects needed for autoupdating. Only dbResourceAccessor, resourceMather and resourceNameAnalyzer needs to be set in order to use Darwin. Other objects are created and wired by this method.