Archives par mot-clé : java

HashMap and ConcurrentHashMap Microbenchmark

Publié le 14 février 2018 par davidhxxx

Is ConcurrentHashMap always faster than HashMap for concurrent access ? If the map is accessible by concurrent threads, ConcurrentHashMap without additional synchronization mechanisms is often enough for reading operations. We may have some delay in the returned values by the … Continuer la lecture →

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Design Pattern : decorator implementation in Java

Publié le 19 juin 2016 par davidhxxx

The source code of design patterns can be viewed and downloaded here : https://github.com/ebundy/java-examples/tree/master/design-patterns What is it ? The decorator design pattern is a structural pattern.It allows to design a class to decorate another class in a dynamic way. Decorator is … Continuer la lecture →

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Create a trading application in Java (4/15) – Task : Define applicative layers

Publié le 27 novembre 2015 par davidhxxx

Our model design will be based on three application layers: – A graphical layer (presentation) – A business service layer (logic) – A data access layer (data) The data access layer will be both used by the service layer and … Continuer la lecture →

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Task: Go from domain model to business design model

Publié le 26 novembre 2015 par davidhxxx

We will turn our conceptual model in business design model (classes) that we will illustrate by a business class diagram.  From this diagram, we could create raw Java classes of entities. 1) Go from domain model to business design model … Continuer la lecture →

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Create a trading application in Java (3/15) – Task : Design the conceptual model

Publié le 23 novembre 2015 par davidhxxx

From the identified use cases and  basic trading knowledge, we will describe the conceptual model. In RUP (Rational Unified Process), we speak about « domain model ». Warning: the conceptual model is not a software components model. It is primarily a domain … Continuer la lecture →

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Create a trading application in Java (6/15) – Task : Define where stored data

Publié le 23 novembre 2015 par davidhxxx

Let ${myVar} stands for a variable named myVar (it’s the Maven template for inlining Maven variables ). We will allow users application to define the data root directory. So, let ${app.base.dir}, a variable representing the directory you chose as the … Continuer la lecture →

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