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Brooklyn entities for Web App software processes
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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.brooklyn.entity.webapp;

import org.apache.brooklyn.api.catalog.Catalog;
import org.apache.brooklyn.api.entity.ImplementedBy;
import org.apache.brooklyn.api.sensor.AttributeSensor;
import org.apache.brooklyn.core.config.render.RendererHints;
import org.apache.brooklyn.core.sensor.BasicAttributeSensor;
import org.apache.brooklyn.entity.group.DynamicCluster;
import org.apache.brooklyn.util.time.Duration;

/**
 * DynamicWebAppClusters provide cluster-wide aggregates of entity attributes.  Currently totals and averages:
 * 
 *   Entity request counts
 *   Entity error counts
 *   Requests per second
 *   Entity processing time
 * 
 */
@Catalog(name="Dynamic Web-app Cluster", description="A cluster of web-apps, which can be dynamically re-sized; this does not include a load-balancer")
@ImplementedBy(DynamicWebAppClusterImpl.class)
public interface DynamicWebAppCluster extends DynamicCluster, WebAppService, JavaWebAppService,
        JavaWebAppService.CanDeployAndUndeploy, JavaWebAppService.CanRedeployAll {

    public static final AttributeSensor REQUEST_COUNT_PER_NODE = new BasicAttributeSensor(
            Double.class, "webapp.reqs.total.perNode", "Cluster entity request average");

    public static final AttributeSensor ERROR_COUNT_PER_NODE = new BasicAttributeSensor(
            Integer.class, "webapp.reqs.errors.perNode", "Cluster entity request error average");

    public static final AttributeSensor REQUESTS_PER_SECOND_LAST_PER_NODE = new BasicAttributeSensor(
            Double.class, "webapp.reqs.perSec.last.perNode", "Reqs/sec (last datapoint) averaged over all nodes");

    public static final AttributeSensor REQUESTS_PER_SECOND_IN_WINDOW_PER_NODE = new BasicAttributeSensor(
            Double.class, "webapp.reqs.perSec.windowed.perNode", "Reqs/sec (over time window) averaged over all nodes");

    public static final AttributeSensor TOTAL_PROCESSING_TIME_PER_NODE = ApplyDisplayHints.TOTAL_PROCESSING_TIME_PER_NODE;

    public static final AttributeSensor PROCESSING_TIME_FRACTION_IN_WINDOW_PER_NODE = new BasicAttributeSensor(
            Double.class, "webapp.reqs.processingTime.fraction.windowed.perNode", "Fraction of time spent processing " +
            "reported by webserver (percentage, over time window) averaged over all nodes");

    class ApplyDisplayHints {
        public static final AttributeSensor TOTAL_PROCESSING_TIME_PER_NODE = new BasicAttributeSensor(
            Integer.class, "webapp.reqs.processingTime.perNode", "Total processing time per node (millis)");
        static {
            RendererHints.register(TOTAL_PROCESSING_TIME_PER_NODE, RendererHints.displayValue(Duration.millisToStringRounded()));
        }
    }

}