com.oneops.opamp.cache.WatchedByAttributeCacheLoader.java Source code

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Here is the source code for com.oneops.opamp.cache.WatchedByAttributeCacheLoader.java

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/*******************************************************************************
 *  
 *   Copyright 2015 Walmart, 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 com.oneops.opamp.cache;

import java.util.List;

import org.apache.commons.lang.StringUtils;
import org.apache.log4j.Logger;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import com.google.common.cache.CacheLoader;
import com.oneops.cms.cm.domain.CmsCIRelation;
import com.oneops.cms.cm.domain.CmsCIRelationAttribute;
import com.oneops.cms.cm.service.CmsCmProcessor;

/**
 * 
 * @author glall
 * Loads the 'WatchedBy' aka 'Monitor'  relation attributes; key {manifestId:toCiName:attributeName}
 */
@Component
public class WatchedByAttributeCacheLoader extends CacheLoader<String, String> {
    /**
     * Logger instance
     */
    private static Logger logger = Logger.getLogger(WatchedByAttributeCacheLoader.class);

    /**
     * Cms CI processor
     */
    @Autowired
    private CmsCmProcessor cmProcessor;

    @Override
    public String load(String key) {
        logger.warn("Loading Watched By Attributes from cms for " + key);
        String attributeValue = null;
        if (key == null) {
            throw new IllegalArgumentException("key can not be null");
        } else {
            //split the key
            String[] parts = key.split(":");
            long manifestId = Long.valueOf(parts[0]);
            String source = parts[1];
            String attributeName = parts[2];
            attributeValue = getAttributeValue(manifestId, source, attributeName);
        }
        logger.info("loaded  the attribute for key: " + key + " with value " + attributeValue);

        return attributeValue;
    }

    private String getAttributeValue(Long manifestId, String source, String attributeName) {
        List<CmsCIRelation> manifestRelations = cmProcessor.getFromCIRelationsByClassAndCiName(manifestId,
                "manifest.WatchedBy", null, "manifest.Monitor", source);
        String attributeValue = null;
        if (manifestRelations.size() > 0) {
            CmsCIRelationAttribute attribute = manifestRelations.get(0).getAttribute(attributeName);

            attributeValue = (attribute != null) ? attribute.getDfValue() : StringUtils.EMPTY;
            if (attribute == null) {
                logger.warn("The relation attribute :" + attributeName + " could not be found for manifestId "
                        + manifestId + " source " + source);
            }
        }
        return attributeValue;
    }

}