dropwizard - 在 Dropwizard 中注册资源

Question

我无法在 Dropwizard 应用程序的 run() 方法中注册多个资源。当我这样做时，我收到以下异常:

Exception in thread "main" MultiException[java.lang.IllegalArgumentException: A metric named io.dropwizard.db.ManagedPooledDataSource.postgresql.active already exists, java.util.concurrent.RejectedExecutionException: org.eclipse.jetty.util.thread.NonBlockingThread@27f74733]
at org.eclipse.jetty.server.Server.doStart(Server.java:329)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
at io.dropwizard.cli.ServerCommand.run(ServerCommand.java:43)
at io.dropwizard.cli.EnvironmentCommand.run(EnvironmentCommand.java:43)
at io.dropwizard.cli.ConfiguredCommand.run(ConfiguredCommand.java:76)
at io.dropwizard.cli.Cli.run(Cli.java:70)
at io.dropwizard.Application.run(Application.java:73)
at com.xxx.xxx.yyy.GobblerHTTPApplication.main(GobblerHTTPApplication.java:19)

Answer 1

如果您碰巧使用 Hibernate 初始化数据库，例如。通过在主应用程序中使用以下代码段(两次):

private final HibernateBundle<Cfg> hib1 = new HibernateBundle<Cfg>(ImmutableList.of(SomeHibernateModel.class), new SessionFactoryFactory()) {
    @Override
    public DataSourceFactory getDataSourceFactory(Cfg configuration) {
        return configuration.getDatabaseFactory();
    }
};

那么覆盖另一个方法会很有帮助:“name()”方法。该方法是提供指标名称的最后一部分(“.postgresql.active”部分)的来源。像这样:

private final HibernateBundle<Cfg> hib1 = new HibernateBundle<Cfg>(ImmutableList.of(SomeHibernateModel.class), new SessionFactoryFactory()) {
    @Override
    public DataSourceFactory getDataSourceFactory(Cfg configuration) {
        return configuration.getDatabaseFactory();
    }
    @Override
    protected String name() {
        return "hibernate.accesslog";
    }

};