Class ConfigLoader

java.lang.Object

io.nosqlbench.nb.api.config.standard.ConfigLoader

public class ConfigLoader
extends Object

The config loader is meant to be the way that configurations for objects or subsystems are loaded generically.

It supports value which are defined as JSON objects, lists of JSON objects, or as a fall-back simple parameter maps according to ParamsParser rules.

If a block of config data begins with a '[' (open square bracket), it is taken as a JSON list of configs. If it starts with a '{' (open curly brace), it is taken as a single config. Otherwise it is taken as a simple set of named parameters using '=' as an assignment operator. An empty string represents the null value. Users of this interface should be prepared to receive a null, or a list of zero or more config elements of the requested type.

Importing configs

Configs can be imported from local files, classpath resources, or URLs. This is supported with the form of

IMPORT{URL}

where URL can be any form mentioned above. This syntax is obtuse and strange, but the point of this is to use something that should never occur in the wild, to avoid collisions with actual configuration content, but which is also clearly doing what it says.

Constructor Summary

Constructors

Constructor	Description
ConfigLoader()

Method Summary

Modifier and Type	Method	Description
<T> List<T>	load(CharSequence source, Class<? extends T> type)
<V> LinkedHashMap<String,V>	loadMap(CharSequence source, Class<? extends V> type, Function<V,String> keyer)	Load a string into an ordered map of objects, with the key being defined by an extractor function over the objects.

Methods inherited from class java.lang.Object

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

Constructor Details

ConfigLoader

public ConfigLoader()

Method Details

loadMap

public <V> LinkedHashMap<String,V> loadMap(CharSequence source,
 Class<? extends V> type,
 Function<V,String> keyer)

Load a string into an ordered map of objects, with the key being defined by an extractor function over the objects. Any duplicate keys are treated as an error. This is a useful method for loading configuration blocks which must be distinctly named.

Type Parameters:

V - The generic parameter for the type field

Parameters:

source - The config data

type - The type of configuration object to be stored in the map values

keyer - The function that extracts the key

Returns:

A map of named configuration objects

load

public <T> List<T> load(CharSequence source,
 Class<? extends T> type)