Dropwizard: How to stop service programmatically

问题:

To start the service, I know one uses new MyService().run(args). How to stop it?

I need to start and stop programmatically for setUp() and tearDown() in my tests.

回答1:

You can start the service in new thread, once the test ends the service will shutdown automatically.

However starting in dropwizard 0.6.2 the dropwizard-testing module contains a junit rule exactly for this use case (see here).

Usage of this rule will look something like this:

Class MyTest {

    @ClassRule
    public static TestRule testRule = new DropwizardServiceRule<MyConfiguration>(MyService.class,
                    Resources.getResource("service.yml").getPath()));

    @Test
    public void someTest(){
    ....

回答2:

Keep the environment variable around and add the following method to your application:

public void stop() throws Exception {
  environment.getApplicationContext().getServer().stop();
}

Now you can call myService.stop() to stop the server.

回答3:

Thanks @LiorH for this great suggestion.

Here is a complete test class using the DropwizardServiceRule in dropwizard-0.6.2.

First create a service configuration for testing: testing-server.yml and place it in the test's class path (ex. src\test\resources). This way you can set different ports for the test service to use:

http:
  port: 7000
  adminPort: 7001

A simple test class that checks if there is a resource at the location "/request" looks like this:

class TheServiceTest {

    @ClassRule
    public static DropwizardServiceRule RULE = new DropwizardServiceRule<MyConfiguration>(TheService.class,
            Resources.getResource("testing-server.yml").getPath());

    @Test
    public void
    dropwizard_gets_configured_correctly() throws Exception {
        Client client = new Client();

        ClientResponse response = client.resource(
                String.format("http://localhost:%d/request", RULE.getLocalPort()))
                        .get(ClientResponse.class);

        assertThat(response.getStatus(), is(200));
    }
}

I have also added the import in case you do not know what implementation to choose.

import com.google.common.io.Resources;
import com.sun.jersey.api.client.Client;
import com.sun.jersey.api.client.ClientResponse;
import com.yammer.dropwizard.testing.junit.DropwizardServiceRule;
import org.junit.ClassRule;
import org.junit.Test;
import org.junit.rules.TestRule;

import static org.hamcrest.core.Is.is;
import static org.junit.Assert.assertThat;

At the end of the tests, the server will shutdown gracefully, so you do not need to worry about it.

回答4:

you can try using stop() method of org.eclipse.jetty.server.Server, which is internally used by Dropwizard.

回答5:

Or you use this java feature in your main/constructor ...:

    // In case jvm shutdown
    Runtime.getRuntime().addShutdownHook(new Thread() {
        @Override
        public void run()
        {
            // what should be closed if forced shudown
            // ....

            LOG.info(String.format("--- End of ShutDownHook (%s) ---", APPLICATION_NAME));
        }
    });