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ConfigProvider.java
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ConfigProvider.java
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/*
*******************************************************************************
* Copyright (c) 2011-2017 Contributors to the Eclipse Foundation
*
* See the NOTICE file(s) distributed with this work for additional
* information regarding copyright ownership.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* You may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Contributors:
* 2016-07-14 - Mark Struberg
* Initial revision cf41cf130bcaf5447ff8
* 2016-07-20 - Romain Manni-Bucau
* Initial ConfigBuilder PR 0945b23cbf9dadb75fb9
* 2016-11-14 - Emily Jiang / IBM Corp
* SPI reworked into own ConfigProviderResolver
* 2016-12-02 - Viktor Klang
* removed ConfigFilter and security related functionality.
*
*******************************************************************************/
package org.eclipse.microprofile.config;
import org.eclipse.microprofile.config.spi.ConfigProviderResolver;
/**
* <p>
* This is the central class to access a {@link Config}.
* A {@link Config} provides access to application Configuration.
* That might be auto-discovered {@code Config} or even manually created one.
*
* <p>
* The default usage is to use {@link #getConfig()} to automatically pick up the
* 'Configuration' for the Thread Context ClassLoader (See
* {@link Thread#getContextClassLoader()}).
*
* <p>
* A 'Configuration' consists of the information collected from the registered {@link org.eclipse.microprofile.config.spi.ConfigSource ConfigSources}.
* These {@link org.eclipse.microprofile.config.spi.ConfigSource ConfigSources} get sorted according to
* their <em>ordinal</em> defined via {@link org.eclipse.microprofile.config.spi.ConfigSource#getOrdinal()}.
* Thus it is possible to overwrite configuration by providing in a ConfigSource with higher importance from outside.
*
* <p>
* It is also possible to register custom {@link org.eclipse.microprofile.config.spi.ConfigSource ConfigSources} to flexibly
* extend the configuration mechanism. An example would be to pick up
* configuration values from a database table.
*
* Example usage:
*
* <pre>
* String restUrl = ConfigProvider.getConfig().getValue("myproject.some.remote.service.url", String.class);
* Integer port = ConfigProvider.getConfig().getValue("myproject.some.remote.service.port", Integer.class);
* </pre>
*
* For more advanced use cases like e.g. registering a manually created {@link Config} please see
* {@link ConfigProviderResolver#registerConfig(Config, ClassLoader)} and {@link ConfigProviderResolver#getBuilder()}.
*
* @author <a href="mailto:struberg@apache.org">Mark Struberg</a>
* @author <a href="mailto:rmannibucau@apache.org">Romain Manni-Bucau</a>
* @author <a href="mailto:emijiang@uk.ibm.com">Emily Jiang</a>
* @author <a href="mailto:viktor.klang@gmail.com">Viktor Klang</a>
*/
public final class ConfigProvider {
private static final ConfigProviderResolver INSTANCE = ConfigProviderResolver.instance();
private ConfigProvider() {
}
/**
* Provide a {@link Config} based on all {@link org.eclipse.microprofile.config.spi.ConfigSource ConfigSources} of the
* current Thread Context ClassLoader (TCCL)
* <p>
*
* <p>
*
* The {@link Config} will be stored for future retrieval.
* <p>
* There is exactly a single Config instance per ClassLoader
*
* @return the config object for the thread context classloader
*/
public static Config getConfig() {
return INSTANCE.getConfig();
}
/**
* Provide a {@link Config} based on all {@link org.eclipse.microprofile.config.spi.ConfigSource ConfigSources} of the
* specified ClassLoader
*
* <p>
* There is exactly a single Config instance per ClassLoader
*
* @param cl the specified classloader
* @return the config for the specified classloader
*/
public static Config getConfig(ClassLoader cl) {
return INSTANCE.getConfig(cl);
}
}