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Posted to commits@tuscany.apache.org by co...@apache.org on 2008/04/10 03:48:00 UTC
[CONF] Apache Tuscany: SCA Java Development Guide (page edited)
SCA Java Development Guide (TUSCANY) edited by Raymond Feng
Page: http://cwiki.apache.org/confluence/display/TUSCANY/SCA+Java+Development+Guide
Changes: http://cwiki.apache.org/confluence/pages/diffpagesbyversion.action?pageId=47570&originalVersion=87&revisedVersion=88
Content:
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{section:border=true}
{column:width=15%}
{include: SCA Java Subproject Menu}
{include: Java SCA Menu New}
{column}
{column:width=85%}
{panel:title= How to get involved in development of Java SCA? |borderStyle=solid|borderColor=#C3CDA1|titleBGColor=#C3CDA1|bgColor=#ECF4D1}
This document is the development guideline for SCA Java project.
* [General Guide|#General Guide]
* [Getting Source code|#Getting Source]
* [Setting up your development environment|#Setup]
* [Building the binary and source distributions|#Distributions]
* [Importing SCA modules into your Development IDE|#IDE]
* [Understanding SCA Code Path|#Code Path]
* [Coding Guidelines|#Coding Guidelines]
* [Testing|#Testing]
* [Maven Build Structure|#Maven Build Structure]
* [Reporting Issues and Providing patches|#Providing patches]
* *Development Hints*
** [Generating Eclipse WTP Web Projects for Webapp samples|#Webapp in Eclipse]
** [Generating Dependencies for Ant in Samples|#Ant]
\\
{panel}
h3. {anchor:General Guide}
{bgcolor:#C3CDA1}General Guide
{bgcolor}
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.
h3. {anchor:Getting Source}
{bgcolor:#C3CDA1}Getting Source code
{bgcolor}
The Java SCA project Subversion repository is located at [https://svn.apache.org/repos/asf/incubator/tuscany/java/sca].
The 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.
h4. Checking out code from Subversion
Use the command as follows (note that it uses http scheme so if you're a committer change it to https):
{code}
svn checkout http://svn.apache.org/repos/asf/incubator/tuscany/java/sca
{code}
h4. 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.
Tuscany committers should configure these properties in the svn per-user config. On Unix-like systems, this area appears as a directory named .subversion in the user's home directory. On Win32 systems, Subversion creates a folder named Subversion, typically inside the Application Data area of the user's profile directory (C:\Documents and Settings\<user name>\Application Data\Subversion, which, by the way, is usually a hidden directory).
Please make sure the following properties are set in the "config" file:
{code}
[miscellany]
...
enable-auto-props = yes
[auto-props]
### The format of the entries is:
### file-name-pattern = propname[=value][;propname[=value]...]
### The file-name-pattern can contain wildcards (such as '*' and
### '?'). All entries which match will be applied to the file.
### Note that auto-props functionality must be enabled, which
### is typically done by setting the 'enable-auto-props' option.
*.c = svn:eol-style=native
*.cpp = svn:eol-style=native
*.h = svn:eol-style=native
*.dsp = svn:eol-style=CRLF
*.dsw = svn:eol-style=CRLF
*.sh = svn:eol-style=native;svn:executable
*.txt = svn:eol-style=native
*.png = svn:mime-type=image/png
*.jpg = svn:mime-type=image/jpeg
Makefile = svn:eol-style=native
*.java = svn:eol-style=native;svn:keywords=Rev Date
*.xml = svn:eol-style=native;svn:keywords=Rev Date
*.xsd = svn:eol-style=native;svn:keywords=Rev Date
*.html = svn:eol-style=native;svn:keywords=Rev Date
*.properties = svn:eol-style=native;svn:keywords=Rev Date
*.jelly = svn:eol-style=native;svn:keywords=Rev Date
*.ipr = svn:eol-style=native
*.iml = svn:eol-style=native
{code}
Once your password is set, you can use a command like this to commit:
{code}
svn commit
{code}
If Subversion can't figure out your username, you can tell it explicitly:
{code}
svn --username <name> commit
{code}
Subversion will prompt you for a password, and once you've entered it, it will remember it for you. Note this is the password you configured with svnpasswd not your shell or other password.
h3. {anchor:Setup}
{bgcolor:#C3CDA1}Setting up your Development Environment
{bgcolor}
h4. Prerequisites
Java SCA requires the following:
* [JDK 5.0\+ (J2SE 1.5.0+)|http://java.sun.com/j2se/1.5.0]
* [Apache Maven (2.0.5)|http://maven.apache.org/] (note: currently using Maven versions higher than 2.0.5 may have problems building Tuscany, see TUSCANY-1676)
* [Subversion (1.2+)|http://subversion.tigris.org/]
h4. 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. Java SCA currently have the below module hierarchy :
{noformat}
-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
|-- tools SCA Tools (Eclipse plugins, wsdl2java, java2wsdl, etc)
|-- tutorial SCA Tutorial
{noformat}
The individual modules can be built separately or build with top-down build.
h4. top-down build (recommended approach)
Check out all of the java source code.
{code}
svn checkout http://svn.apache.org/repos/asf/incubator/tuscany/java
{code}
Building the SCA source code is simple
{code}
cd java/sca
mvn
{code}
It should work even if you start with an empty Maven local repository, and it should always work, however when you are building for Tuscany for the first time there are a lot of dependencies which must be downloaded so the first build can take a long time and it may fail with problems retrieving the dependencies.
(on) 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.
(on) The trunk code sometimes has SNAPSHOT dependencies which can get out of date in your local repository so if you see odd build failures try updating the SNAPSHOT jars with:
{code}
mvn -U
{code}
(on) 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
{code}
mvn -o
{code}
h4. {anchor:Distributions} Building the binary and source distributions
The binary and source distribution release artifacts are created by running maven in the distribution folder, for example:
{code}
cd java/sca/distribution
mvn clean install -o
{code}
The distribution artifacts can then be found in the folder named "target" within the distribution folder.
h3. {anchor:IDE}
{bgcolor:#C3CDA1}Importing SCA modules into your Development IDE
{bgcolor}
h4. 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 :
{code}
mvn -Declipse.workspace=[path-to-eclipse-workspace] eclipse:add-maven-repo
{code}
In order to generate the necessary project files to import the SCA modules to Eclipse, you can use the maven eclipse plugin
{code}
cd java/sca
mvn -Peclipse eclipse:eclipse
{code}
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.
h3. {anchor:Code Path}
{bgcolor:#C3CDA1}Understanding SCA code path
{bgcolor}
Here is a walk through of [key methods/functions|SCA Java Get Started with Coding] which help you get started with SCA Java development.
h3. {anchor:Coding Guidelines}
{bgcolor:#C3CDA1}Coding Guidelines
{bgcolor}
There are a few simple guidelines when developing for JAVA SCA:
* The basic coding style used is the described at [Sun Java coding standards|http://java.sun.com/docs/codeconv/] but the main thing is to be consistent with the existing code you're updating, so for example, if you're updating a method that uses the braces on the same line style don't add code with the hanging braces style.
* Always include the Apache License Headers on all files (both source code files and resource files such as xml documents)
* Include a descriptive log message for checkins, for example "fixed such and such problem".
h4. 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.\*
h3. {anchor:Testing}
{bgcolor:#C3CDA1}Testing
{bgcolor}
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.
{code}
/**
* 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();
}
...
}
{code}
(on) 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.
h3. {anchor:Maven Build Structure}
{bgcolor:#C3CDA1}Maven Build Structure
{bgcolor}
_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
h4. 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.
h3. {anchor:Providing patches}
{bgcolor:#C3CDA1}Reporting issues and providing patches
{bgcolor}
{include: Found a Bug Section}
{HTMLcomment:hidden}{children:sort=creation}{HTMLcomment}
h2. Development Hints
h3. {anchor:Webapp in Eclipse}
{bgcolor:#C3CDA1}Generating Eclipse WTP Web Projects for Webapp samples
{bgcolor}
f you're using Eclipse WTP and want to get WTP Web Projects generated
for our Webapp samples you can simply pass a \-Dwtpversion=1.5 option to
the usual mvn eclipse:eclipse command, like this:
mvn \-Dwtpversion=1.5 \-Peclipse eclipse:eclipse
The magic \-Dwtpversion=1.5 option will add the WTP Web project nature to
all the Eclipse projects with <packaging>war</packaging> in their Maven
pom.xml. You'll then be able to add these projects to a WTP Tomcat or
Geronimo Server configuration, to publish and run them straight from
your Eclipse workspace.
h3:{anchor:Ant}
{bgcolor:#C3CDA1}Generating Dependencies for Ant in Samples
{bgcolor}
Figuring out the package dependency to include in Ant build.xml can be a pain. Here is a quick
script which works in Linux environment for war files.
{code}
jar tvf sample-feed-aggregator-webapp.war | grep .jar | awk '{ printf "%s\n", $8 }' | sed -e "s/WEB-INF\/lib\///" | awk '{ printf "<include name=\"%s\"/>\n", $1 }' | grep -v tuscany
{code}
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