acoelhosantos / dropwizard-hk2bundle Goto Github PK

Simple dropwizard bundle for autodiscovery and injection of dropwizard managed objects, tasks etc using hk2 integration

• Auto registration and injection for:
  • Healthchecks
  • Managed objects
  • Lifecycle listeners
  • Tasks
  • Commands
  • HK2 Binders
  • Other bundles
• Hibernate validators injections
• Jdbi DAOs injections
• Support for injections before Jersey initialisation

repositories {
    maven { url "https://jitpack.io" }
}

dependencies {
    compile 'com.github.alex-shpak:dropwizard-hk2bundle:0.4.1'
    compile 'org.glassfish.hk2:hk2-metadata-generator:2.4.0'
}

<repositories>
    <repository>
        <id>jitpack.io</id>
        <url>https://jitpack.io</url>
    </repository>
</repositories>

<dependencies>
    <dependency>
        <groupId>com.github.alex-shpak</groupId>
        <artifactId>dropwizard-hk2bundle</artifactId>
        <version>0.4.1</version>
    </dependency>
    <dependency>
        <groupId>org.glassfish.hk2</groupId>
        <artifactId>hk2-metadata-generator</artifactId>
        <version>2.4.0</version>
    </dependency>
</dependencies>

Add bundle to your dropwizard application

bootstrap.addBundle(HK2Bundle.with(this).build());

All classes that you want to be discovered or injected should be annotated with @org.jvnet.hk2.annotations.Service annotation

@Service
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");
    }
}

Considering you already has dropwizard-jdbi module in dependencies, add JDBIBinder to HK2Bundle configuration. Then you would be able to inject DAOs.

HK2Bundle hk2bundle = HK2Bundle.with(this)
        .bind(new JDBIBinder(config -> config.database))
        .build();
bootstrap.addBundle(hk2bundle);

@Inject
private MyDAO myDAO;

Hk2bundle initializes new ServiceLocator and binds found services into it. Then it sets created ServiceLocator as parent of jersey's ServiceLocator

environment.getApplicationContext().setAttribute(
    ServletProperties.SERVICE_LOCATOR, serviceLocator
);

After jersey initialisation services (if enabled) will be re-injected with new ServiceLocator

If you don't want to use metadata generator you can bind services manually using AbstractBinder supplied to bundle constructor

public class Binder extends AbstractBinder {

    @Override
    protected void configure() {
        bind(DatabaseHealthCheck.class)
            .to(HealthCheck.class)
            .in(Singleton.class);
    }
}

bootstrap.addBundle(HK2Bundle.with(this)
        .bind(new Binder())
        .build()
);

MIT