Hi there!
We are attempting to configure certain system properties in our Maven project for AEM. We'd like to create a Java class that executes only once during startup.
For instance, consider these configurations:
Locale.setDefault(new Locale("es", "ES"));
How can we achieve this?
Thank you!
You could add the runOnceMethod() in a service's activate() method. That will run once as soon as its gets activated.
Interface
public interface MyService {
void runOnceMethod();
}
Implementation
(
service = MyService.class,
configurationPolicy = ConfigurationPolicy.OPTIONAL,
immediate = true
)
@Designate(ocd = Configuration.class)
public class MyServiceImpl implements MyService {
private static final Logger LOG = LoggerFactory.getLogger(MyServiceImpl.class);
private Configuration configuration;
@ObjectClassDefinition(
name = "My Service",
description = "My Service containing a method that only runs once."
)
public Configuration {
@AttributeDefinition(name = "Enabled")
boolean enabled() default true;
}
public void activate(Configuration configuration) {
LOG.info("Service activated");
this.configuration = configuration;
runOnceMethod();
}
public void modified(Configuration configuration) {
LOG.info("Service modified");
this.configuration = configuration;
}
public void deactivate(Configuration configuration) {
LOG.info("Service deactivated");
this.configuration = configuration;
}
public void runOnceMethod() {
if (configuration.enabled()) {
LOG.debug("Running runOnceMethod");
// Perform some actions.
}
}
}
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