com.opsmatters.newrelic.batch.renderers.MetricConditionRenderer Maven / Gradle / Ivy

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/*
 * Copyright 2018 Gerald Curley
 *
 * 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.opsmatters.newrelic.batch.renderers;

import java.io.IOException;
import java.util.List;
import java.util.ArrayList;
import java.util.logging.Logger;
import com.opsmatters.core.documents.OutputFileWriter;
import com.opsmatters.newrelic.api.model.Entity;
import com.opsmatters.newrelic.api.model.EntityList;
import com.opsmatters.newrelic.api.model.alerts.policies.AlertPolicy;
import com.opsmatters.newrelic.api.model.alerts.policies.AlertPolicyList;
import com.opsmatters.newrelic.api.model.alerts.conditions.MetricCondition;
import com.opsmatters.newrelic.batch.templates.FileTemplate;
import com.opsmatters.newrelic.batch.templates.TemplateFactory;

/**
 * Base class for all metric alert condition renderers.
 * 
 * @author Gerald Curley (opsmatters)
 */
public abstract class MetricConditionRenderer extends BaseConditionRenderer
{
    private static final Logger logger = Logger.getLogger(MetricConditionRenderer.class.getName());

    /**
     * Protected constructor.
     */
    protected MetricConditionRenderer()
    {
    }

    /**
     * Writes the given alert conditions to a writer.
     * @param policies The set of alert policies for the conditions
     * @param entities The set of entities for the condition
     * @param conditions The alert conditions to be serialized
     * @param writer The writer to use to serialize the alert conditions
     * @throws IOException if there was an error writing the alert conditions
     */
    public void render(List policies, List entities, List conditions, OutputFileWriter writer)
        throws IOException
    {
        List lines = new ArrayList();
        FileTemplate template = TemplateFactory.getTemplate(getClass());
        AlertPolicyList policyList = new AlertPolicyList(policies);
        EntityList entityList = new EntityList(entities);
        String[] headers = template.getOutputHeaders();

        lines.add(headers);
        for(T condition : conditions)
        {
            AlertPolicy policy = policyList.get(condition.getPolicyId());
            if(policy == null)
                throw new IllegalStateException("unable to find policy \""+condition.getPolicyId()+"\" for alert condition: "+condition.getName());
            if(policy.getId() == null || policy.getId() == 0L)
                throw new IllegalStateException("missing policy_id: "+policy.getName());
            lines.add(serialize(entityList.list(condition.getEntities()), template, policy, condition));
        }

        logger.fine("Rendering "+template.getType()+" file: headers="+headers.length+" lines="+lines.size());
        writer.write(lines);
    }

    /**
     * Serializes the alert condition to a line.
     * 
     * Implemented by super-class.
     * 
     * @param entities The set of entities for the condition
     * @param template The template with the columns
     * @param policy The alert policy for the condition
     * @param condition The alert condition to be serialized
     * @return The line representing the alert condition
     */
    protected abstract String[] serialize(List entities, FileTemplate template, AlertPolicy policy, T condition);
}