io.servicecomb.config.ConfigurationSpringInitializer.java Source code

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Here is the source code for io.servicecomb.config.ConfigurationSpringInitializer.java

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/*
 * Copyright 2017 Huawei Technologies Co., Ltd
 *
 * 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.
 */

package io.servicecomb.config;

import java.io.IOException;
import java.util.Iterator;
import java.util.Properties;

import org.apache.commons.configuration.AbstractConfiguration;
import org.springframework.beans.factory.config.PropertyPlaceholderConfigurer;
import org.springframework.core.Ordered;

import com.netflix.config.ConfigurationManager;
import com.netflix.config.DynamicPropertyFactory;

public class ConfigurationSpringInitializer extends PropertyPlaceholderConfigurer {
    public ConfigurationSpringInitializer() {
        ConfigUtil.installDynamicConfig();
        setOrder(Ordered.LOWEST_PRECEDENCE / 2);
        setIgnoreUnresolvablePlaceholders(true);
    }

    @Override
    protected Properties mergeProperties() throws IOException {
        Properties properties = super.mergeProperties();

        AbstractConfiguration config = ConfigurationManager.getConfigInstance();
        Iterator<String> iter = config.getKeys();
        while (iter.hasNext()) {
            String key = iter.next();
            Object value = config.getProperty(key);
            properties.put(key, value);
        }
        return properties;
    }

    @Override
    protected String resolvePlaceholder(String placeholder, Properties props) {
        String propertyValue = super.resolvePlaceholder(placeholder, props);
        if (propertyValue == null) {
            return DynamicPropertyFactory.getInstance().getStringProperty(placeholder, null).get();
        }
        return propertyValue;
    }
}