org.zalando.stups.spring.boot.actuator.ExtInfoEndpointConfiguration.java Source code

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Here is the source code for org.zalando.stups.spring.boot.actuator.ExtInfoEndpointConfiguration.java

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/**
 * Copyright (C) 2015 Zalando SE (http://tech.zalando.com)
 *
 * 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.zalando.stups.spring.boot.actuator;

import java.util.LinkedHashMap;
import java.util.List;
import java.util.Properties;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.actuate.autoconfigure.EndpointAutoConfiguration;
import org.springframework.boot.actuate.endpoint.InfoEndpoint;
import org.springframework.boot.autoconfigure.AutoConfigureBefore;
import org.springframework.context.annotation.Bean;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.PropertiesLoaderUtils;

import com.google.common.collect.Lists;
import com.google.common.collect.Maps;

/**
 * Creates an {@link InfoEndpoint} from existing '.properties'-file in the classpath.
 * 
 * @author jbellmann
 *
 */
@AutoConfigureBefore({ EndpointAutoConfiguration.class })
public class ExtInfoEndpointConfiguration {

    private static final String PROPERTIES_SUFFIX_REPLACEMENT = "";
    private static final String PROPERTIES_SUFFIX = ".properties";
    private final Logger log = LoggerFactory.getLogger(ExtInfoEndpointConfiguration.class);

    @Bean
    public InfoEndpoint infoEndpoint() throws Exception {
        LinkedHashMap<String, Object> info = new LinkedHashMap<String, Object>();
        for (String filename : getAllPropertiesFiles()) {
            Resource resource = new ClassPathResource("/" + filename);
            Properties properties = new Properties();
            if (resource.exists()) {
                properties = PropertiesLoaderUtils.loadProperties(resource);
                String name = resource.getFilename();

                info.put(name.replace(PROPERTIES_SUFFIX, PROPERTIES_SUFFIX_REPLACEMENT),
                        Maps.fromProperties(properties));
            } else {
                if (failWhenResourceNotExists()) {
                    throw new RuntimeException("Resource : " + filename + " does not exist");
                } else {
                    log.info("Resource {} does not exist", filename);
                }
            }
        }
        return new InfoEndpoint(info);
    }

    protected List<String> getAllPropertiesFiles() {
        return Lists.newArrayList();
    }

    protected boolean failWhenResourceNotExists() {
        return false;
    }
}