io.druid.initialization

Class Initialization

java.lang.Object

io.druid.initialization.Initialization

public class Initialization
extends Object

Constructor Summary

Constructors

Constructor and Description
Initialization()

Method Summary

Modifier and Type	Method and Description
static URLClassLoader	getClassLoaderForExtension(File extension)
static File[]	getExtensionFilesToLoad(ExtensionsConfig config) Find all the extension files that should be loaded by druid.
static <T> Collection<T>	getFromExtensions(ExtensionsConfig config, Class<T> clazz) Look for extension modules for the given class from both classpath and extensions directory.
static File[]	getHadoopDependencyFilesToLoad(List<String> hadoopDependencyCoordinates, ExtensionsConfig extensionsConfig) Find all the hadoop dependencies that should be loaded by druid
static <T> Set<T>	getLoadedModules(Class<T> clazz)
static List<URL>	getURLsForClasspath(String cp)
static com.google.inject.Injector	makeInjectorWithModules(com.google.inject.Injector baseInjector, Iterable<? extends com.google.inject.Module> modules)

Methods inherited from class java.lang.Object

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

Constructor Detail

Initialization

public Initialization()

Method Detail

getLoadedModules

public static <T> Set<T> getLoadedModules(Class<T> clazz)

Type Parameters:

T -

Parameters:

clazz - Module class

Returns:

Returns the set of modules loaded.

getFromExtensions

public static <T> Collection<T> getFromExtensions(ExtensionsConfig config,
                                                  Class<T> clazz)

Look for extension modules for the given class from both classpath and extensions directory. A user should never put the same two extensions in classpath and extensions directory, if he/she does that, the one that is in the classpath will be loaded, the other will be ignored.

Parameters:

config - Extensions configuration

clazz - The class of extension module (e.g., DruidModule)

Returns:

A collection that contains distinct extension modules

getExtensionFilesToLoad

public static File[] getExtensionFilesToLoad(ExtensionsConfig config)

Find all the extension files that should be loaded by druid.

If user explicitly specifies druid.extensions.loadList, then it will look for those extensions under root extensions directory. If one of them is not found, druid will fail loudly.

If user doesn't specify druid.extension.toLoad (or its value is empty), druid will load all the extensions under the root extensions directory.

Parameters:

config - ExtensionsConfig configured by druid.extensions.xxx

Returns:

an array of druid extension files that will be loaded by druid process

getHadoopDependencyFilesToLoad

public static File[] getHadoopDependencyFilesToLoad(List<String> hadoopDependencyCoordinates,
                                                    ExtensionsConfig extensionsConfig)

Find all the hadoop dependencies that should be loaded by druid

Parameters:

hadoopDependencyCoordinates - e.g.["org.apache.hadoop:hadoop-client:2.3.0"]

extensionsConfig - ExtensionsConfig configured by druid.extensions.xxx

Returns:

an array of hadoop dependency files that will be loaded by druid process

getClassLoaderForExtension

public static URLClassLoader getClassLoaderForExtension(File extension)
                                                 throws MalformedURLException

Parameters:

extension - The File instance of the extension we want to load

Returns:

a URLClassLoader that loads all the jars on which the extension is dependent

Throws:

MalformedURLException

getURLsForClasspath

public static List<URL> getURLsForClasspath(String cp)

makeInjectorWithModules

public static com.google.inject.Injector makeInjectorWithModules(com.google.inject.Injector baseInjector,
                                                                 Iterable<? extends com.google.inject.Module> modules)