| /* |
| * 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.karaf.decanter.processor.groupby; |
| |
| import org.osgi.service.component.ComponentContext; |
| import org.osgi.service.component.annotations.Activate; |
| import org.osgi.service.component.annotations.Component; |
| import org.osgi.service.component.annotations.Deactivate; |
| import org.osgi.service.component.annotations.Reference; |
| import org.osgi.service.event.Event; |
| import org.osgi.service.event.EventAdmin; |
| import org.osgi.service.event.EventConstants; |
| import org.osgi.service.event.EventHandler; |
| |
| import java.util.*; |
| import java.util.concurrent.ConcurrentHashMap; |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.ScheduledExecutorService; |
| import java.util.concurrent.TimeUnit; |
| |
| @Component( |
| name = "org.apache.karaf.decanter.processor.groupby", |
| immediate = true, |
| property = EventConstants.EVENT_TOPIC + "=decanter/collect/*" |
| ) |
| public class GroupByProcessor implements EventHandler { |
| |
| @Reference |
| private EventAdmin dispatcher; |
| |
| private String targetTopics; |
| private String groupBy; |
| private boolean flat; |
| |
| private ConcurrentHashMap<Integer, List<Event>> accumulation = new ConcurrentHashMap<>(); |
| |
| private ScheduledExecutorService scheduledExecutorService; |
| |
| @Activate |
| public void activate(ComponentContext componentContext) { |
| activate(componentContext.getProperties()); |
| } |
| |
| public void activate(Dictionary<String, Object> configuration) { |
| targetTopics = (configuration.get("target.topics") != null) ? configuration.get("target.topics").toString() : "decanter/process/aggregate"; |
| long period = (configuration.get("period") != null) ? Long.parseLong(configuration.get("period").toString()) : 60L; |
| groupBy = (configuration.get("groupBy") != null) ? configuration.get("groupBy").toString() : null; |
| flat = (configuration.get("flat") != null) ? Boolean.parseBoolean(configuration.get("flat").toString()) : true; |
| scheduledExecutorService = Executors.newScheduledThreadPool(1); |
| scheduledExecutorService.scheduleAtFixedRate(new GroupByTask(), 0, period, TimeUnit.SECONDS); |
| } |
| |
| @Deactivate |
| public void deactivate() { |
| scheduledExecutorService.shutdownNow(); |
| } |
| |
| @Override |
| public void handleEvent(Event event) { |
| String[] groups = groupBy.split(","); |
| int hash = 0; |
| for (String group : groups) { |
| if (event.getProperty(group) == null) { |
| return; |
| } else { |
| hash = hash + event.getProperty(group).hashCode(); |
| } |
| } |
| if (accumulation.get(hash) == null) { |
| List<Event> events = new ArrayList<>(); |
| events.add(event); |
| accumulation.put(hash, events); |
| } else { |
| accumulation.get(hash).add(event); |
| } |
| } |
| |
| class GroupByTask implements Runnable { |
| |
| @Override |
| public void run() { |
| if (accumulation.size() > 0) { |
| for (Integer hash : accumulation.keySet()) { |
| Map merge = new HashMap(); |
| merge.put("processor", "groupBy"); |
| if (flat) { |
| for (Event event : accumulation.get(hash)) { |
| for (String propertyName : event.getPropertyNames()) { |
| merge.put(propertyName, event.getProperty(propertyName)); |
| } |
| } |
| } else { |
| List<Map<String, Object>> events = new ArrayList<>(); |
| merge.put("events", events); |
| for (Event event : accumulation.get(hash)) { |
| Map<String,Object> properties = new HashMap<>(); |
| for (String propertyName : event.getPropertyNames()) { |
| properties.put(propertyName, event.getProperty(propertyName)); |
| } |
| events.add(properties); |
| } |
| } |
| // send event |
| String[] topics = targetTopics.split(","); |
| for (String topic : topics) { |
| dispatcher.postEvent(new Event(topic, merge)); |
| } |
| } |
| accumulation.clear(); |
| } |
| } |
| |
| } |
| |
| public void setDispatcher(EventAdmin dispatcher) { |
| this.dispatcher = dispatcher; |
| } |
| |
| } |