Building OSGi applications that use AspectJ with Tycho / Maven 3

I just pushed a template for creating AspectJ applications with Tycho and will give you a quick tour of it here. You’ll find the template on github [1]

The template contains four infrastructure projects. One defines an OSGi command to calculate faculties and another contains an aspect to measure the duration of the calculation.

Let’s take a closer look. com.eclipsesource.weaving.demo.releng contains the Maven parent pom.xml file which defines the modules of the application:

<groupId>com.eclipsesource.sandbox.weaving.demo</groupId>
<artifactId>com.eclipsesource.sandbox.weaving.demo.parent</artifactId>
<version>0.1.0-SNAPSHOT</version>
 
<packaging>pom</packaging>
...
<modules>
 <module>../platform</module>
 
 <module>../weaving.demo.chronometry</module>
 <module>../weaving.demo.faculty</module>
 <module>../weaving.demo.feature</module>
 
 <module>../repository</module>
</modules>

com.eclipsesource.weaving.demo.platform – contains the target definition

weaving demo target Building OSGi applications that use AspectJ with Tycho / Maven 3

com.eclipsesource.weaving.demo.feature – defines the application scope

weaving demo feature Building OSGi applications that use AspectJ with Tycho / Maven 3

com.eclipsesource.weaving.demo.repository contains the product definition. One very important VM argument, almost hidden from the debug arguments, registers the framework weaving extension:

-Dosgi.framework.extensions=org.eclipse.equinox.weaving.hook

weaving demo arguments Building OSGi applications that use AspectJ with Tycho / Maven 3

The weaving service has to be started early.

weaving demo startlevel Building OSGi applications that use AspectJ with Tycho / Maven 3

As well as the four infrastructure projects, the template contains the application code:
com.eclipsesource.weaving.demo.faculty – provides an OSGi console command to calculate faculty.

public class FacultyCommandProvider implements CommandProvider {
 
  public void _faculty(CommandInterpreter ci) {
    String argument = ci.nextArgument();
    int argumentAsInteger = Integer.valueOf(argument).intValue();
    System.out.println("Faculty of " + argumentAsInteger + " is "
          + recur(argumentAsInteger));
  }
...

com.eclipsesource.weaving.demo.chronometry – contains the Aspect to measure the faculty execution time.

public aspect CommandProviderChronometer {
  void around(CommandInterpreter ci):
        execution(void CommandProvider+._faculty(CommandInterpreter))
          &amp;&amp; args(ci) {
    long start = System.nanoTime();
    proceed(ci);
    long duration = System.nanoTime() - start;
    System.out.println("Result calculated in " + (duration / 1000) + " micro seconds");
  }
}

The following snippet from the project’s pom.xml file tells Tycho to use the aspectj compiler:

...
<build>
  <plugins>
    <plugin>
      <groupId>org.codehaus.mojo</groupId>
      <artifactId>aspectj-maven-plugin</artifactId>
      <version>1.3.1</version>
      <configuration>
        <verbose>true</verbose>
        <complianceLevel>1.5</complianceLevel>
     </configuration>
     <executions>
       <execution>
        <goals>
          <goal>compile</goal>
        </goals>
      </execution>
    </executions>
 </plugin>
 </plugins>
</build>
...

We build the application the Tycho way, from the command line with Maven 3.x:

> cd releng
> mvn package
...
[INFO] --- tycho-p2-director-plugin:0.12.0:archive-products (archive-products) @ com.eclipsesource.sandbox.weaving.demo.repository ---
[INFO] Building zip: .../weaving.demo_...-macosx.cocoa.x86_64.zip
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary:
[INFO]
[INFO] com.es..weaving.demo.parent ..... SUCCESS [0.002s]
[INFO] com.es..weaving.demo.platform ... SUCCESS [0.269s]
[INFO] com.es..weaving.demo.faculty .... SUCCESS [1.995s]
[INFO] com.es..weaving.demo.chronometry  SUCCESS [0.482s]
[INFO] com.es..weaving.demo.feature .... SUCCESS [0.533s]
[INFO] com.es..weaving.demo.repository . SUCCESS [7.262s]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------

We can now unzip the artifact and launch the application:

> unzip weaving.demo_selfcontained-macosx.cocoa.x86_64.zip
> Eclipse.app/Contents/MacOS/eclipse

The following output shows that weaving was successful:

osgi> [org.eclipse.equinox.weaving.aspectj] info Starting AspectJ weaving service ...
...
[com.eclipsesource.weaving.demo.faculty] info register aspect com.es..CommandProviderChronometer
[org.eclipse.equinox.weaving.aspectj] info weaving bundle 'com.eclipsesource.weaving.demo.faculty'
[com.eclipsesource.weaving.demo.faculty] weaveinfo Join point 'method-execution(void com.es..FacultyCommandProvider._faculty(org.eclipse..CommandInterpreter))'
in Type 'com.es..FacultyCommandProvider' (FacultyCommandProvider.java:9)
advised by around advice from 'com.es..CommandProviderChronometer' (CommandProviderChronometer.aj:8)

Running the OSGi console command shows the measurement in action:

osgi> faculty 23
Faculty of 23 is 862453760
Result calculated in 1165 micro seconds

[1] https://github.com/eclipsesource/com.eclipsesource.tycho.aspectj.demo

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2 Responses to “Building OSGi applications that use AspectJ with Tycho / Maven 3”

  1. Hendy Irawan says:
    July 16, 2011 at 22:36

    Florian,

    Thank you for publishing your AspectJ template on GitHub!

    I used it to post an article on Tycho here: http://eclipsedriven.blogspot.com/2011/07/configuring-eclipse-tycho-maven-plugin.html

    I hope you don’t mind :-)

  2. Florian Waibel says:
    July 18, 2011 at 09:32

    My pleasure!
    I’m glad you found the article helpful.

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