February 17th 2012
Tags:
Build
No Comments
Something I have always lamented about OSGi is a lack of simple examples to get up and running quickly. So here is a simple example using Groovy:
First, dependencies are easily added via Maven, adding the following to your pom.xml should do it.
[code]
<dependencies>
<dependency>
<groupId>org.codehaus.groovy</groupId>
<artifactId>groovy-all</artifactId>
</dependency>
<dependency>
<groupId>org.apache.felix</groupId>
<artifactId>org.apache.felix.framework</artifactId>
<version>4.0.2</version>
</dependency>
</dependencies>
[/code]
Then a simple Groovy script to start ...
October 18th 2011
Tags:
Uncategorized
No Comments
A simple way to prevent running of multiple instances of your application is to use Socket communication. For example, in Groovy the first thing you would execute is something like this:
[code]
try {
// choose a unique port (!!)
new Socket('localhost', 1337)
...
November 2nd 2009
Tags:
Java
No Comments
Sometimes we may have more than one implementation and/or instance of a service to which we need to route requests. Routing may be controlled by a number of different factors, such as the request type, request arguments, runtime configuration, etc.
An implementation of such routing might look something like this:
[java]
public interface ...
October 13th 2009
Tags:
Java
No Comments
Typically object caching in Java is managed by the container or framework in use. Occasionally however there is a need to manually cache domain-specific objects, whereby a java.util.Map implementation will not suffice.
Using the popular ehcache framework as an example, the following pattern is typically observed:
[java]
public class SomeClass {
private ...
October 8th 2009
Tags:
Java
No Comments
In OSGi using a publisher/subscriber design can be somewhat more complicated that traditional Java environments:
[java]
public class SomeBundleActivator implements BundleActivator {
private SomeService service = ...
private ServiceRegistration registration;
public void start(BundleContext context) {
registration = context.registerService(SomeService.class.getName(), service, null);
}
...
}
public class AnotherBundleActivator ...
