Question

我正在努力了解如何最好地添加像Jest to Play这样的东西。

在Play的2.5.x依赖注入文档中，它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注入。

虽然这对于我编写的类非常有意义，但我并不真正理解如何注入像Jest这样的东西，它通过工厂实例化：

 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();

在我的控制器中，我该如何正确注入Jest？我是否创建了一个jest工厂包装器，然后在构造函数中调用getObject（）？它似乎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旨在成为单身人士，不为每个请求构建它！

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

因此注入工厂不是一个好选择。

我认为工厂创建JestClient并将类绑定到实例会很好：

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; } }

将其绑定在模块中：

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

使用它：

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

正确地将Jest添加到Java Play 2.5.x.

1 个答案: