MetricsEnvironmentPostProcessor.java

/**
 * Copyright 2017 Pivotal Software, Inc.
 *
 * 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.metrics.boot;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.env.EnvironmentPostProcessor;
import org.springframework.core.env.ConfigurableEnvironment;
import org.springframework.core.env.MapPropertySource;
import org.springframework.core.env.MutablePropertySources;
import org.springframework.core.env.PropertySource;
import org.springframework.util.ClassUtils;

import java.util.LinkedHashMap;
import java.util.Map;

/**
 * @author Dave Syer
 */
public class MetricsEnvironmentPostProcessor implements EnvironmentPostProcessor {

    private static final Log log = LogFactory.getLog(MetricsEnvironmentPostProcessor.class);

    @Override
    public void postProcessEnvironment(ConfigurableEnvironment environment,
                                       SpringApplication application) {
        if (ClassUtils.isPresent("com.netflix.servo.monitor.Monitors", null)) {
            // Make spring AOP default to target class so RestTemplates can be customized,
            // @Scheduled instrumented
            log.debug("Setting 'spring.aop.proxyTargetClass=true' to make spring AOP default to target class so RestTemplates can be customized");
            addDefaultProperty(environment, "spring.aop.proxyTargetClass", "true");
        }
    }

    private void addDefaultProperty(ConfigurableEnvironment environment, String name,
                                    String value) {
        MutablePropertySources sources = environment.getPropertySources();
        Map<String, Object> map = null;
        if (sources.contains("defaultProperties")) {
            PropertySource<?> source = sources.get("defaultProperties");
            if (source instanceof MapPropertySource) {
                map = ((MapPropertySource) source).getSource();
            }
        } else {
            map = new LinkedHashMap<>();
            sources.addLast(new MapPropertySource("defaultProperties", map));
        }
        if (map != null) {
            map.put(name, value);
        }
    }
}