io.wcm.caravan.io.http.impl.ArchaiusConfig.java Source code

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Here is the source code for io.wcm.caravan.io.http.impl.ArchaiusConfig.java

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/*
 * #%L
 * wcm.io
 * %%
 * Copyright (C) 2014 wcm.io
 * %%
 * 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.
 * #L%
 */
package io.wcm.caravan.io.http.impl;

import org.apache.commons.configuration.AbstractConfiguration;
import org.apache.commons.configuration.Configuration;
import org.apache.commons.configuration.ConfigurationException;
import org.apache.commons.configuration.PropertiesConfiguration;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.netflix.config.ConcurrentCompositeConfiguration;
import com.netflix.config.ConcurrentMapConfiguration;
import com.netflix.config.ConfigurationManager;

/**
 * Initialize static archaius context.
 */
final class ArchaiusConfig {

    private static final String DEFAULT_CONFIGURATION = "/config.properties";

    private static final ConcurrentMapConfiguration OSGI_CONFIG = new ConcurrentMapConfiguration();

    private static volatile boolean initialized;

    private static final Logger log = LoggerFactory.getLogger(ArchaiusConfig.class);

    private ArchaiusConfig() {
        // static methods only
    }

    /**
     * Initialize archaius configuration. This is done only once, if called again nothing is done.
     */
    public static void initialize() {
        if (initialized) {
            return;
        }
        synchronized (ArchaiusConfig.class) {
            if (initialized) {
                return;
            }
            try {
                initializeArchaius();
                initialized = true;
            } catch (ConfigurationException ex) {
                log.error("Initializing archaius configuration failed.", ex);
            }
        }
    }

    private static void initializeArchaius() throws ConfigurationException {
        // Default configuration from classpath of this bundle
        AbstractConfiguration defaultConfig = new PropertiesConfiguration(
                ArchaiusConfig.class.getResource(DEFAULT_CONFIGURATION));

        ConcurrentCompositeConfiguration finalConfig = new ConcurrentCompositeConfiguration();

        // inject OSGi config which is filled via {@link ArchaiusOsgiProperties}
        finalConfig.addConfiguration(OSGI_CONFIG);

        finalConfig.addConfiguration(defaultConfig);

        ConfigurationManager.install(finalConfig);

        log.debug("Initialized archaius configuration.");
    }

    /**
     * @return Archaius configuration
     */
    public static Configuration getConfiguration() {
        return OSGI_CONFIG;
    }

}