ApacheCon EU Apache Zest. COP Composite Oriented Programming. October 2 nd, 2015 Jiri Jetmar, CEO Smartnerds GmbH Paul Merlin, Title/Role here

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1 ApacheCon EU 2015 Apache Zest COP Composite Oriented Programming October 2 nd, 2015 Jiri Jetmar, CEO Smartnerds GmbH Paul Merlin, Title/Role here

2 Agenda What is Apache Zest? Zest Libraries & App Building Strategies Sample App Live Coding Session Zest Community, Real World Apps & Outlook Genius is one percent inspiration and ninety nine percent perspiration. Thomas A. Edison

3 Apache Zest tm Fact Sheet :: History Apache Zest was born as Qi4j in 2007 Founded by Richard Öberg (EJBoss, later JBoss) and Niclas Hedhman Version 1.0, 1.1 and 1.2 in 2010 Version 2.0 in 2013 Since beginning of 2015 a Gold Apache Foundation Project // JJ Current Version 2.1, 3.0 in 2015 with lots of new features Born of Qi4j Version 2.0 Version nd Gen Apache Zest later 2015

4 Apache Zest tm It is about solving (business) problems :: (Re-) Usage of proven patterns Zest is nothing new. It is an logical next step based on existing and proved patterns and ideas Zest is an Java implementation of the Composite Oriented Programming (COP) pattern COP is a programming model that allows the creation of rich domain models :: Business problem centric approach 1) Start with the business problem 2) Use the terminology from Domain Driven Design (DDD) 3) Allow developers to implement the Domain Model directly in code using that Terminology 4) Plug infrastructural building blocks that reflects the needs and requirements Proven and well-known patterns Apache Zest Core DI AOP DDD COP COP fragments are used to composite Applications

5 Apache Zest tm What sort of problems to solve with Zest? :: Rich Domain Models Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diamzest is an Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam :: High ratio of DM changes over time Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diamzest is an Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam :: Transactional, integrative and API centric Applications Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diamzest is an Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam

6 Apache Zest tm & COP Overview :: COP in one sentence Composite Oriented Programming allows developers to work with 'fragments', smaller than classes, and 'compose' fragments into larger 'composites' which acts like the regular objects. Niclas Hedhman :: COP & Apache Zest The most basic element in Zest is the Composite A Composite is created by composing a number of Fragments Mixings are Fragments that can handle method invocations Modifiers are Fragments that modify method invocations (Decorator pattern) Constraints, Concern, SideEffects

7 Apache Zest tm Basic Fragments :: validates method arguments Can have many Constraints per argument Uses annotations to trigger Cooperate with concern for failure intercept method calls Allowed to modify arguments and i.) return values, ii.) return with calling in chain, iii.) throws exceptions Composite (1) Constraint Concern are called after a method call has finished Cannot change method arguments or return value Cannot throws exceptions Can inspect exceptions and return values May be asynchronous Mixin (1) Property (1) Property (n) Association Mixin implements Composite interfaces A Mixin may implement one interface, many interfaces or just some methods May contain Composite state, such as Property and Association instances May be Composite private not exposed in Composite interface Figure XX : Composite Fragments

Apache Zest tm Structure Composition :: Application Structure Composites define the internals of objects Explicit Composite meta types : Value, Entity,

more Modules per Layer Composite (1) Metatypes : Value, Entity, Service and Composite (n) Transient Figure XX : Structure Composition Visibility and

8 Apache Zest tm Structure Composition :: Application Structure Composites define the internals of objects Explicit Composite meta types : Value, Entity, Service and Transient Layer Module Composites resides in Modules Modules can be grouped into Layers One or more Layers per Application Zero, one or more Modules per Layer Composite (1) Metatypes : Value, Entity, Service and Composite (n) Transient Figure XX : Structure Composition Visibility and dependency of Composites between structures is controlled Declaration of Visibility of Composites Dependency and Visibility Figure XX : Application Structering

9 Agenda What is Apache Zest? Apache Zest Libraries & App Building Strategies Sample App Live Coding Session Zest Community, Real World Apps & Outlook Genius is one percent inspiration and ninety nine percent perspiration. Thomas A. Edison

10 Apache Zest tm Library ecosystem (.. there is much more!) HATEOAS REST API File / Memory Configuration Entity Store LevelDB Scheduling Neo4j Metrics Event Sourcing Caching Scala integration Functional API I/O Streaming API Apache Zest Core Entity Index Data Migration Re-Indexing RIAK SQL ElasticSearch RDF Solr Geospatial Query

11 Application Building A bit grey Theory Interaction Model Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore Channels Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore Service Model S (1) S (n) Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore Functional Model F (1) F (n) Todo.. State Model Figure XX : Top-Down Application Model

12 Application Building... How to do using Zest! Clients Service Layer REST API I Module REST API II Module Domain Layer Domain Model A Infra. Layer InMemory Store Module ElasticSearchIndex Module Config Layer.. Module WebJetty Module Figure XX : Concrete Zest-based Application structure

13 Agenda What is Apache Zest? Zest Libraries & App Building Strategies Sample App Live Coding Session Zest Community, Real World Apps & Outlook Genius is one percent inspiration and ninety nine percent perspiration. Thomas A. Edison

14 Sample App Live Coding Session $ git clone

15 Agenda What is Apache Zest? Key Components, Building Blocks & Ecosystem Sample App Live Coding Session Zest Community, Real World Apps & Outlook Genius is one percent inspiration and ninety nine percent perspiration. Thomas A. Edison

16 Apache Zest tm Community :: Community The current Zest developer community is rather small, but passionate individuals who are all convinced of Zest's merit and potential. Over the years there has been 28 code contributors in total, of which 8 have been considered Core Developers, i.e. allowed to make changes on the Core runtime on trunk without hand-holding. No access control was in place to enforce that, and a social contract worked very well. so do not wait, JOIN us right now!! We are looking forward to..

Who is using Apache Zest tm? Productive http://smarpay.ch is a swiss company that offers mobile payment services in the vending business.

17 Who is using Apache Zest tm? Productive is a swiss company that offers mobile payment services in the vending business. Apache Zest is used to offer backoffice services like settlement and clearing for about 3k vending machines and about 350k mobile users. In development P* - is a german Startup that offers services around the car parking business. Apache Zest is used for the entire backoffice with a large number of services like User-/Partner Management, Product Catalog, Reservation- & Scheduling System, Payment Services.

18 Apache Zest tm Outlook :: Current Version is 2.1 First release of the Qi4j codebase under the ASF umbrella. Still uses org.qi4j.* for backward compability. A number of feature added ( Complex Configuration Types, NamedAssiciations, tovalue() and toentity() conversions) Bugfixings and cleanups.. :: Outlook for 3.0 (end of 2015) Full Java 8 Support (Lambda, Streaming API,..) GeoSpatial Queries...

19 Thank you! See you at J

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