AmazonEc2InstanceDataPropertySourcePostProcessor.java

/*
 * Copyright 2013-2014 the original author or authors.
 *
 * 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 org.springframework.cloud.aws.context.config;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.cloud.aws.core.env.ec2.AmazonEc2InstanceDataPropertySource;
import org.springframework.context.EnvironmentAware;
import org.springframework.core.Ordered;
import org.springframework.core.PriorityOrdered;
import org.springframework.core.env.ConfigurableEnvironment;
import org.springframework.core.env.Environment;
import org.springframework.util.StringUtils;

/**
 * @author Agim Emruli
 */
public class AmazonEc2InstanceDataPropertySourcePostProcessor implements PriorityOrdered, EnvironmentAware, BeanFactoryPostProcessor {

    static final String INSTANCE_DATA_PROPERTY_SOURCE_NAME = "InstanceData";
    private static final Logger LOGGER = LoggerFactory.getLogger(AmazonEc2InstanceDataPropertySourcePostProcessor.class);

    private Environment environment;
    private String valueSeparator;
    private String attributeSeparator;

    @Override
    public void setEnvironment(Environment environment) {
        this.environment = environment;
    }

    @Override
    public int getOrder() {
        return Ordered.HIGHEST_PRECEDENCE;
    }

    public void setValueSeparator(String valueSeparator) {
        this.valueSeparator = valueSeparator;
    }

    public void setAttributeSeparator(String attributeSeparator) {
        this.attributeSeparator = attributeSeparator;
    }

    @Override
    public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
        if (this.environment instanceof ConfigurableEnvironment) {
            AmazonEc2InstanceDataPropertySource propertySource = new AmazonEc2InstanceDataPropertySource(INSTANCE_DATA_PROPERTY_SOURCE_NAME);

            if (StringUtils.hasText(this.valueSeparator)) {
                propertySource.setUserDataValueSeparator(this.valueSeparator);
            }

            if (StringUtils.hasText(this.attributeSeparator)) {
                propertySource.setUserDataAttributeSeparator(this.attributeSeparator);
            }

            ((ConfigurableEnvironment) this.environment).getPropertySources().addLast(propertySource);
        } else {
            LOGGER.warn("Environment is not of type '{}' property source with instance data is not available", ConfigurableEnvironment.class.getName());
        }
    }
}