java - 正确地将 Jest 添加到 Java Play 2.5.x

Question

我正在尝试了解如何最好地添加像 Jest 这样的东西来玩。

在 Play 的 2.5.x 依赖注入(inject)文档中，他们展示了如何添加单例，然后可以在需要时通过构造函数注入(inject)进行注入(inject)。

虽然这对于我编写的类来说非常有意义，但我真的不明白如何注入(inject)像 Jest 这样的东西，它是通过工厂实例化的:

 JestClientFactory factory = new JestClientFactory();
 factory.setHttpClientConfig(new HttpClientConfig
                        .Builder("http://localhost:9200")
                        .multiThreaded(true)
            //Per default this implementation will create no more than 2 concurrent connections per given route
            .defaultMaxTotalConnectionPerRoute(<YOUR_DESIRED_LEVEL_OF_CONCURRENCY_PER_ROUTE>)
            // and no more 20 connections in total
            .maxTotalConnection(<YOUR_DESIRED_LEVEL_OF_CONCURRENCY_TOTAL>)
                        .build());
 JestClient client = factory.getObject();

在我的 Controller 中，我应该如何正确注入(inject) Jest？我是否创建一个笑话工厂包装器，然后在构造函数中调用 getObject() ？这看起来根本不是一个理想的解决方案。

JestFactoryWrapper.java

@Singleton
class JestFactoryWrapper {

    private JestFactory jestFactory;

    JestFactoryWrapper() {
        this.jestFactory = ...
    }

    public JestFactory getObject() {
        return this.jestFactory.getObject()
    }
}

ApiController.java

@Inject
ApiController(JestFactoryWrapper jestFactory) {
    this.jestClient = factory.getObject();
}

Answer 1

来自文档:

JestClient is designed to be singleton, don't construct it for each request!

https://github.com/searchbox-io/Jest/tree/master/jest

所以注入(inject)工厂并不是一个好的选择。

我认为最好通过工厂创建一个 JestClient 并将类绑定(bind)到实例:

示例

模块:

public class Module extends AbstractModule {

  @Override
  protected void configure() {
    ...
    bind(JestClient.class).toInstance(jestFactory.getObject());
    ...
  }
}

用法:

@Inject
ApiController(JestClient jestClient) {
    this.jestClient = jestClient;
}

<强> Provider Bindings

创建一个提供者单例。

@Singleton
public class JestClientProvider implements Provider<JestClient> {

    private final JestClient client;

    @Inject
    public JestClientProvider(final Configuration configuration, final ApplicationLifecycle lifecycle) {
        // Read the configuration.
        // Do things on the start of the application.

        ...

        client = jestFactory.getObject();

        lifecycle.addStopHook(() -> {
            // Do things on the stop of the application.
            // Close the connections and so on. 
        })
    }

    @Override
    public JestClient get() {
        return client;
    }
}

在模块中绑定(bind):

bind(JestClient.class).toProvider(JestClientProvider.class).asEagerSingleton();

使用它:

@Inject
ApiController(JestClient jestClient) {
    this.jestClient = jestClient;
}