如何使用dropwizard上的guice自动连接HibernateBundle？

Question

我试图用guice / dropwizard配置hibernatebundle，需要帮助。我除了dropwizard lib之外，还使用hubspot /
dropwizard-guice / 0.7.0
3rd
party库。

下面的代码显然无法正常工作，需要帮​​助找出它。我该如何重写它，以便将hibernatebundle以及最终的会话工厂自动注入到需要它的任何bean中。

MyApplication.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

这就是我最终要做的事情。我从这里或邮件列表中都没有得到答案，因此我会认为这种骇人听闻的方法，可能不是正确的方法，但对我有用。

在我的模块中（扩展了abstractmodule）：

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;
    }
}