airomem core

Prevayler based persistence engine

License

License

GroupId

GroupId

pl.setblack
ArtifactId

ArtifactId

airomem-core
Last Version

Last Version

1.1.2
Release Date

Release Date

Type

Type

jar
Description

Description

airomem core
Prevayler based persistence engine
Project URL

Project URL

https://github.com/airomem/airomem
Source Code Management

Source Code Management

https://github.com/airomem/airomem

Download airomem-core

How to add to project

<!-- https://jarcasting.com/artifacts/pl.setblack/airomem-core/ -->
<dependency>
    <groupId>pl.setblack</groupId>
    <artifactId>airomem-core</artifactId>
    <version>1.1.2</version>
</dependency>
// https://jarcasting.com/artifacts/pl.setblack/airomem-core/
implementation 'pl.setblack:airomem-core:1.1.2'
// https://jarcasting.com/artifacts/pl.setblack/airomem-core/
implementation ("pl.setblack:airomem-core:1.1.2")
'pl.setblack:airomem-core:jar:1.1.2'
<dependency org="pl.setblack" name="airomem-core" rev="1.1.2">
  <artifact name="airomem-core" type="jar" />
</dependency>
@Grapes(
@Grab(group='pl.setblack', module='airomem-core', version='1.1.2')
)
libraryDependencies += "pl.setblack" % "airomem-core" % "1.1.2"
[pl.setblack/airomem-core "1.1.2"]

Dependencies

compile (7)

Group / Artifact Type Version
org.prevayler : prevayler-core jar 2.6
org.prevayler : prevayler-factory jar 2.6
org.prevayler.extras : prevayler-xstream jar 2.6
com.google.guava : guava jar 29.0-jre
commons-io : commons-io jar 2.4
pl.setblack : badass jar 1.0
com.esotericsoftware : kryo jar 3.0.3

test (2)

Group / Artifact Type Version
junit : junit jar 4.10
org.mockito : mockito-all jar 1.9.5

Project Modules

There are no modules declared in this project.

airomem

Build Status Codacy Badge

Airomem is Java persistence framework based on Prevayler. The most important features are:

  • speed,
  • simplicity.

This is achieved because there is no Database. There is only persistence.

Motivation

I have a lot of positive experience with Prevayler - quite an old project published by Klaus Wuestefeld. Pure Prevayler lacks however some features and is not perfectly safe for inexperienced teams.

Goal of this project is to provide Prevayler based persistence with extra features such as Java 8 Lambda expressions, Kryo based serialization, rich collections (CQEngine) and sanity checks that make Prevayler easier to implement. (Quite honestly Prevayler is perfectly easy to implement, it just does not always work as people expect).

So airomem = Prevayler | safety | tools | lambdas | kryo | build...

Take a look at Features.

Basic

Lets assume that system is build without need of persistence. All operations are mode on objects in memory. Instead of SQL queries, objects are traversed and filtered using stream API.

Instead of making INSERTS, UPDATES, transactions, there are only changes on objects in java. There is no Session, no EntityManager, no cache ( oh,wait a moment - everything is cache...), no problems with ORMs, no performance penalties, no DB deadlocks.

Such world exist and is fun to work with. And what is more funny persistence in this world also exists.

There are only two things to do:

  • all objects from domain must be serializable (this is typically easy to achieve),
  • all operations that change domain must be enclosed in commands.

How simple is that? (Sample Project)

New! Galakpizza Sample Chat Sample

Performance - this thing is insane

This thing must come. How fast is that? Can be more than 1000 times faster than traditional SQL / ORM approach...

I've tried to measure speed in operations per second using jpab project. Results are here.

In reality one can expect to achive performance of 10 up to 1000 faster compared to DB/ORM approach.

More

Please read more on: Wiki

Release notes

Version 1.1.1

Changed to use file sync always. It is slower but safer on some environments.

Version 1.1.0

  • Simplified - no longer use Storable interface with getImmutable
  • Use Path in API instead of String name of folder
  • Transient version for tests
  • xml snapshot (import and export)

Migration from 1.0.5

  • No more SimpleController (what a stupid name it was :-) ?) - class is called Persistent
  • Path instead of Strings as folder names

Version 1.0.5

.

pl.setblack

Airomem

Versions

Version
1.1.2
1.1.1
1.1.0
1.0.5
1.0.4
1.0.3
1.0.2
1.0