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General Guide General Guide

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General Guide

Welcome to the Tuscany SCA Java subproject project. We look forward to your participation and try to help you get on board. Feel free to ask your questions on the mailing list.

Here are some general guidelines we use in this project.

• Java SCA sub-project aims to provide enterprise-grade service infrastructure based on SCA.
• Tuscany SCA is not just a reference implementation. We encourage innovation based on the tenets of SCA. A lot of work we do provides feedback to the specifications.
• The Java SCA infrastructure should provide flexibility and choice. It should not dictate programming models but support many.
• The Java SCA infrastructure is very modularized and is designed to be highly extensible so users can customize it to fit their needs.

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Getting Source Getting Source

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Getting Source code

The Java SCA project Subversion repository is located at https://svn.apache.org/repos/asf/incubator/tuscany/java/sca.
The respository repository can also be viewed online at http://svn.apache.org/viewvc/incubator/tuscany/java/

Anyone can check code out of Subversion. You only need to specify a username and password in order to update the Subversion repository, and only Tuscany committers have the permissions to do so.

Checking out code from Subversion

Use a command likethe command as follows (note that it uses http scheme so if you're a committer change it to https):

svn checkout httpshttp://svn.apache.org/repos/asf/incubator/tuscany/java/sca

Committing Changes to Subversion

Any Tuscany committer should have a shell account on svn.apache.org. Before you can commit, you'll need to set a Subversion password for yourself. To do that, log in to svn.apache.org and run the command svnpasswd.

Once your password is set, you can use a command like this to commit:

svn commit

If Subversion can't figure out your username, you can tell it explicitly:

svn --username <name> commit

Subversion will prompt you for a password, and once you enter 've entered it once, it will remember it for you. Note this is the password you configured with svnpasswd , not your shell or other password.

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Setup Setup

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Setting up your Development Environment

Prerequisites

Java SCA requires the following:

• JDK 5.0+ (J2SE 1.5.0+)
• Apache Maven (2.0.4+)
• Subversion (1.2+)

Build tree structure

The build tree is designed to facilitate modular development and releases. Maven modules are grouped by how they are released under an hierarchy. For example, all kernel-related modules are grouped under the 'kernel' module. The build tree contains the following 'top-level' modules:

kernel
Contains the modules that make up the Java SCA foundation, including:

• api - Contains the Java SCA proprietary programming model apis
• host_api - Contains APIs for interacting with the kernel
• spi - Defines kernel extension points. Includes interfaces and abstract extension classes.
• core - The kernel implementation

Kernel may be checked out and built independently from the other modules such as extensions.

Java SCA currently have the below module hierarchy :

-java
 |-- sca
     |-- demos                SCA demo applications
     |-- distribution         SCA distributions
     |-- itest                SCA Integration Tests
     |-- modules              SCA Implementation Modules (core, runtimes, contribution, extensions, etc)
     |-- samples              SCA Sample Applications

The individual modules can be built separately or build with top-down build.

top-down build (recommended approach)

Check out all of the java source code.To checkout kernel, do:

svn checkout httpshttp://svn.apache.org/repos/asf/incubator/tuscany/java/sca/kernel

Building the SCA source code is simpleTo build kernel, do:

mvncd java/sca

Note that mvn -o may be used once all kernel dependencies have been downloaded

runtime
Contains modules for deploying Java SCA to various runtimes, e.g. in a Servlet Container or as a standalone runtime:

• itest - modules for embedding Java SCA in Maven as an iTest Plugin. Used for integration testing.
• standalone - modules for deploying Java SCA as a standalone container
• services - various runtime services such as JMX
• webapp - modules for embedding Java SCA in a Servlet container

To checkout runtime, do:

svn checkout https://svn.apache.org/repos/asf/incubator/tuscany/java/sca/runtime

The runtime modules may be built together or indepdently as sub-modules using the mvn command.

extensions
Contains kernel extensions such as bindings for transport protocols, component implementation types to enable the use of alternatice programming models, etc. Each extension sub-module builds independently.

services
Contains kernel extensions that provide specific services such as persistence for core runtime operations. Each sub-module builds independently.

mvn

It should work even if you start with an empty Maven local repository, and it should always work. This assumes that maven is able to retrieve a SNAPSHOT version of SDO (and of course the rest of software that SCA depends on) as we haven't built anything other than SCA here.

There can be occasional problems downloading artifacts from remote Maven repositories so if mvn fails with network related sounding messages sometimes just trying again can fix the problem.

Once you have done a top-down build, and your local maven repository is populated, you can start using the maven off line option to speed up the build process

mvn -o

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IDE IDE

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Importing SCA modules into your Development IDE

Using Eclipse

If this is the first time you are using your workspace with maven m2 local repository, you will need to tell your Eclipse workspace the location of the directory, and you can do this with the following command :

mvn -Declipse.workspace=[path-to-eclipse-workspace] eclipse:add-maven-rep

In order to generate the necessary project files to import the SCA modules to Eclipse, you can use the maven eclipse plugin

cd java/sca
mvn -Peclipse eclipse:eclipse

Now, launch your Eclipse IDE, select File->Import->Existing projects into Workplace, and then select the base SCA directory (e.g java/sca) and then press Finish, this should import all SCA modules into your Eclipse Workspace.

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Coding Guidelines Coding Guidelines

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Coding Guidelines

There are a few simple guidelines when developing for JAVA SCA:

• Formatting standards are defined by the .checkstyle and .pmd configurations in the source repository. Please be sure to check code is formatted properly before doing a checkin (see below). If you are unfamiliar with Checkstyle or PMD, please see http://checkstyle.sourceforge.net/ and http://pmd.sourceforge.net/. Consistent formatting makes it easier for others to follow and allows diffs to work properly.

• Always include the Apache License Headers on all files and the following version tag:

@version $Rev$ $Date$

• It is expected that code checked in be accompanied by Please attempt to accompanied code with at least unit tests or verified verify it by existing unit tests . Integration tests when appropriate are also helpful.before submitting a patch or checking in.

• Do not checkin IDE-specific resources such as project files.

• Prior to check-in, perform a clean build and run the complete battery of unit tests for the current module from the command line with Checkstyle enabled, as in:

mvn clean
mvn -o -PcheckstylePsourcecheck

• Please do not perform a checkin using an IDE as doing so is frequently problematic.

• Include a descriptive log message for checkins, i.e. not, "fixed some stuff".

Testing Standards

• for example "fixed such and such problem".

Naming conventions to increase consistency

Folder Names: Please use all lowercases and dashes in folder names (like in the jar names)

• Maven artifact id = tuscany-<folder name>

Package names: Package names within modules should include the module name so that source code can be located in the source tree easily. So, for example, java/sca/module/implementation-java would be in package structure org.apache.tuscany.implementation.java.*

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Testing Testing

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Testing

All committs are expected to be It is expected that checkins are always accompanied by unit test and integration tests when appropriate. Unit tests should verify specific behavior relating to a single class or small set of related classes; intergation integration tests verify code paths across subsystems. Testcases should be documented and clearly indicate what they verify. Also, avoid things that may cause side-effects when possible such as access of external resources.

Tuscany uses plain junit test cases to perform unit and integration testing, below is an example that can also be used as a template for writing new test cases; it demonstrates how to bootstrap the Tuscany SCA runtime in your test case, and because they are based on junit, you can run it from your IDE of choice or from Maven.

/**
 * Description of your test case and necessary details you find necessary
 */
public class YourTestCase extends TestCase {
    private SCADomain domain;
    private YourService service;


    @Override
    protected void setUp() throws Exception {
    	domain = SCADomain.newInstance("YourTest.composite");
        service = domain.getService(YourService.class, "serviceName");
    }

    @Override
    protected void tearDown() throws Exception {
    	domain.close();
    }


   ...
}

Note that we use surefire maven plugin to run the unit and integration tests, and in most cases, they are configured to match a **/*TestCase.java file name pattern. Because of this, if your test case has a different file name pattern, you might execute it from your IDE of choice, but the maven build won't execute the test.

We encourage and follow continuous integration. Martin Fowler has a concise write-up here

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Maven Build Structure Maven Build Structure

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Maven Build Structure

We use the term Module to refer to the leaf of maven tree.

• sca/pom.xml's parent will be pom/parent/pom.xml
• Other poms will use the pom from the parent folder as parent pom
• Group id: org.apache.tuscany.sca
• Version of our modules will be specified once in java/sca/pom.xml, child poms don't need specify a version as they get it from their parent
• pom names begin Apache Tuscany SCA
• Eclipse projects are generated for all built modules using mvn -Peclipse eclipse:eclipse

Adding a new module and not ready to integrate?

'work-in-progress' modules can be worked on in the same source tree and yet not break the top-down build. You can do this by not listing your module(s) in java/sca/modules/pom.xml.

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Providing patches Providing patches

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Reporting issues and providing patches