java - 如何在 dropwizard 上使用 guice 自动连接 HibernateBundle？

Question

我正在尝试使用 guice/dropwizard 配置 hibernatebundle，需要帮助。我正在使用 hubspot / dropwizard-guice / 0.7.0除了 dropwizard 库之外的第 3 方库。

下面的代码显然行不通，需要帮助才能弄明白。我该如何重写它，以便将 hibernatebundle 和最终的 session 工厂自动注入(inject)到任何需要它的 bean 中。

我的应用程序.java

public class MyApplication extends Application<MyAppConfiguration> {

    private final HibernateBundle<MyAppConfiguration> hibernateBundle = new HibernateBundle<MyAppConfiguration>(MyModel.class) {
        @Override
        public DataSourceFactory getDataSourceFactory(MyAppConfiguration configuration) {
            return configuration.getDataSourceFactory();
        }
    };

    @Override
    public void initialize(Bootstrap<MyAppConfiguration> bootstrap) {
        bootstrap.addBundle(hibernateBundle);  // ???

        bootstrap.addBundle(
            GuiceBundle.<MyAppConfiguration>newBuilder()
                    .addModule(new MyAppModule())
                    .enableAutoConfig(getClass().getPackage().getName())
                    .setConfigClass(MyAppConfiguration.class)
                    .build()
        );
    }

}   

MyAppModule.java

public class MyAppModule extends AbstractModule {

    @Provides
    public SessionFactory provideSessionFactory(MyAppConfiguration configuration) {
            // really wrong as it creates new instance everytime.
        return configuration.getHibernateBundle().getSessionFactory(); // ???
    }

}

MyAppConfiguration.java

public class MyAppConfiguration extends Configuration {
    @Valid
    @NotNull
    private DataSourceFactory database = new DataSourceFactory();

    @JsonProperty("database")
    public DataSourceFactory getDataSourceFactory() {
        return database;
    }

    @JsonProperty("database")
    public void setDataSourceFactory(DataSourceFactory dataSourceFactory) {
        this.database = dataSourceFactory;
    }

        // ???
    public HibernateBundle<MyAppConfiguration> getHibernateBundle() {
        return new HibernateBundle<MyAppConfiguration>(MyModel.class) {
            @Override
            public DataSourceFactory getDataSourceFactory(MyAppConfiguration configuration) {
                return database;
            }
        };
    }

}  

Answer 1

这就是我最终的做法。我从来没有从这里或邮件列表中得到答案，所以我认为这很老套，可能不是正确的方法，但它对我有用。

在我的模块中(扩展了抽象模块):

private final HibernateBundle<MyConfiguration> hibernateBundle =
        new HibernateBundle<MyConfiguration>(MyModel.class) {
            @Override
            public DataSourceFactory getDataSourceFactory(MyConfiguration configuration) {
                return configuration.getDataSourceFactory();
            }
        };

@Provides
public SessionFactory provideSessionFactory(MyConfiguration configuration,
                                            Environment environment) {

    SessionFactory sf = hibernateBundle.getSessionFactory();
    if (sf == null) {
        try {
            hibernateBundle.run(configuration, environment);
        } catch (Exception e) {
            logger.error("Unable to run hibernatebundle");
        }
    }

    return hibernateBundle.getSessionFactory();
}

修订:

public SessionFactory provideSessionFactory(MyConfiguration configuration,
                                            Environment environment) {

    SessionFactory sf = hibernateBundle.getSessionFactory();
    if (sf == null) {
        try {
            hibernateBundle.run(configuration, environment);
            return hibernateBundle.getSessionFactory();
        } catch (Exception e) {
            logger.error("Unable to run hibernatebundle");
        }
    } else {
        return sf;
    }
}