Formed in 2009, the Archive Team (not to be confused with the archive.org Archive-It Team) is a rogue archivist collective dedicated to saving copies of rapidly dying or deleted websites for the sake of history and digital heritage. The group is 100% composed of volunteers and interested parties, and has expanded into a large amount of related projects for saving online and digital history.
Dropwizard hk2 Bundle
Dropwizard bundle for injection of managed objects, tasks etc using hk2 integration
Motivation
HK2 is default DI container in jersey, which is widely used in dropwizard, therefore it seems logical to use single DI container.
Features
- Registration and injection for:
- Healthchecks
- Managed objects
- Lifecycle listeners
- Tasks
- Commands
- Metrics
- Other bundles
- Jdbi DAOs injections
- Support for injections before Jersey initialisation
Usage
Grab latest version from JitPack
Gradle
repositories {
maven { url "https://jitpack.io" }
}dependencies {
compile 'com.github.alex-shpak:dropwizard-hk2bundle:0.8.1'
}Code
Add bundle to your dropwizard application
ExampleAppBinder appBinder = new ExampleAppBinder();
HK2Bundle hk2Bundle = new HK2Bundle(appBinder);
bootstrap.addBundle(hk2Bundle);Register DatabaseHealthCheck in HK2 binder
public class ExampleAppBinder extends DropwizardBinder {
@Override
protected void configure() {
healthCheck(DatabaseHealthCheck.class);
}
}DropwizardBinder is convenience class that contains register() method to register objects specific for dropwizard
So now DatabaseHealthCheck get created and initialized by DI container
@Named("database") //Health check name. Class name will be used if not set
public class DatabaseHealthCheck extends HealthCheck {
@Inject
private Provider<Database> database;
@Override
protected Result check() throws Exception {
if(database.get().isConnected()) {
return Result.healthy();
}
return Result.unhealthy("Not connected");
}
}JDBI DAO Injection
Considering you already have dropwizard-jdbi module in dependencies, add JDBIBinder to HK2Bundle configuration.
Then you would be able to inject DAOs.
ExampleAppBinder appBinder = new ExampleAppBinder();
JDBIBinder jdbiBinder = new JDBIBinder<ExampleAppConfiguration>(configuration -> configuration.database)
// .setDBIFactory(JDBIFactory.class)
// .setSqlObjectFactory(SqlObjectFactory.class)
.register(ExampleDAO.class);
HK2Bundle hk2Bundle = new HK2Bundle(appBinder, jdbiBinder);
bootstrap.addBundle(hk2Bundle);@Inject
private ExampleDAO exampleDAO;