io.druid.guice

Class JsonConfigProvider<T>

java.lang.Object

io.druid.guice.JsonConfigProvider<T>

Type Parameters:

T - type of config object to provide.

All Implemented Interfaces:

javax.inject.Provider<com.google.common.base.Supplier<T>>

public class JsonConfigProvider<T>
extends Object
implements com.google.inject.Provider<com.google.common.base.Supplier<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(java.util.Properties, String, Class).
An example might be if DruidServerConfig.class were

   public class DruidServerConfig
   {

Constructor Summary

Constructors

Constructor and Description
JsonConfigProvider(String propertyBase, Class<T> classToProvide)

Method Summary

Methods

Modifier and Type	Method and 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> 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, 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)
com.google.common.base.Supplier<T>	get()
void	inject(Properties props, JsonConfigurator configurator)
static <T> JsonConfigProvider<T>	of(String propertyBase, Class<T> classToProvide)

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)

Method Detail

bind

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

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)

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)

inject

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

get

public com.google.common.base.Supplier<T> get()

Specified by:

get in interface javax.inject.Provider<com.google.common.base.Supplier<T>>