Package org.apache.druid.guice

Class JsonConfigProvider<T>

java.lang.Object

org.apache.druid.guice.JsonConfigProvider<T>

Type Parameters:

T - type of config object to provide.

All Implemented Interfaces:

com.google.inject.Provider<T>, javax.inject.Provider<T>

public class JsonConfigProvider<T>
extends Object
implements com.google.inject.Provider<T>

Provides a singleton value of type <T> from Properties bound in guice.

Usage

To install this provider, bind it in your guice module, like below.

 JsonConfigProvider.bind(binder, "druid.server", DruidServerConfig.class);
 

In the above case, druid.server should be a key found in the Properties bound elsewhere. The value of that key should directly relate to the fields in DruidServerConfig.class.

Implementation

The state of <T> is defined by the value of the property propertyBase. This value is a json structure, decoded via JsonConfigurator.configurate(Properties, String, Class).
An example might be if DruidServerConfig.class were

   public class DruidServerConfig
   {

Constructor Summary

Constructors

Constructor	Description
JsonConfigProvider(String propertyBase, Class<T> classToProvide, Class<? extends T> defaultClass)

Method Summary

Modifier and Type	Method	Description
static <T> void	bind(com.google.inject.Binder binder, String propertyBase, Class<T> classToProvide)
static <T> void	bind(com.google.inject.Binder binder, String propertyBase, Class<T> clazz, com.google.inject.Key<T> instanceKey, com.google.inject.Key<com.google.common.base.Supplier<T>> supplierKey)
static <T> void	bind(com.google.inject.Binder binder, String propertyBase, Class<T> classToProvide, Annotation annotation)
static <T> void	bind(com.google.inject.Binder binder, String propertyBase, Class<T> classToProvide, Class<? extends Annotation> annotation)
static <T> void	bind(com.google.inject.Binder binder, String propertyBase, Class<T> clazz, Class<? extends T> defaultClass, com.google.inject.Key<T> instanceKey, com.google.inject.Key<com.google.common.base.Supplier<T>> supplierKey)
static <T> void	bindInstance(com.google.inject.Binder binder, com.google.inject.Key<T> bindKey, T instance)
static <T> void	bindWithDefault(com.google.inject.Binder binder, String propertyBase, Class<T> classToProvide, Class<? extends T> defaultClass)
T	get()
void	inject(Properties props, JsonConfigurator configurator)
static <T> JsonConfigProvider<T>	of(String propertyBase, Class<T> classToProvide)
static <T> JsonConfigProvider<T>	of(String propertyBase, Class<T> classToProvide, Class<? extends T> defaultClass)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

JsonConfigProvider

public JsonConfigProvider(String propertyBase,
                          Class<T> classToProvide,
                          @Nullable
                          Class<? extends T> defaultClass)

Method Detail

bind

public static <T> void bind(com.google.inject.Binder binder,
                            String propertyBase,
                            Class<T> classToProvide)

bindWithDefault

public static <T> void bindWithDefault(com.google.inject.Binder binder,
                                       String propertyBase,
                                       Class<T> classToProvide,
                                       Class<? extends T> defaultClass)

bind

public static <T> void bind(com.google.inject.Binder binder,
                            String propertyBase,
                            Class<T> classToProvide,
                            Annotation annotation)

bind

public static <T> void bind(com.google.inject.Binder binder,
                            String propertyBase,
                            Class<T> classToProvide,
                            Class<? extends Annotation> annotation)

bind

public static <T> void bind(com.google.inject.Binder binder,
                            String propertyBase,
                            Class<T> clazz,
                            com.google.inject.Key<T> instanceKey,
                            com.google.inject.Key<com.google.common.base.Supplier<T>> supplierKey)

bind

public static <T> void bind(com.google.inject.Binder binder,
                            String propertyBase,
                            Class<T> clazz,
                            Class<? extends T> defaultClass,
                            com.google.inject.Key<T> instanceKey,
                            com.google.inject.Key<com.google.common.base.Supplier<T>> supplierKey)

bindInstance

public static <T> void bindInstance(com.google.inject.Binder binder,
                                    com.google.inject.Key<T> bindKey,
                                    T instance)

of

public static <T> JsonConfigProvider<T> of(String propertyBase,
                                           Class<T> classToProvide)

of

public static <T> JsonConfigProvider<T> of(String propertyBase,
                                           Class<T> classToProvide,
                                           Class<? extends T> defaultClass)

inject

@Inject
public void inject(Properties props,
                   JsonConfigurator configurator)

get

public T get()

Specified by:

get in interface com.google.inject.Provider<T>

Specified by:

get in interface javax.inject.Provider<T>