| /** |
| * Copyright 2016 Open Networking Laboratory |
| * 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.onosproject.kafkaintegration.impl; |
| |
| import org.apache.felix.scr.annotations.Activate; |
| import org.apache.felix.scr.annotations.Component; |
| import org.apache.felix.scr.annotations.Deactivate; |
| import org.apache.felix.scr.annotations.Reference; |
| import org.apache.felix.scr.annotations.ReferenceCardinality; |
| import org.onosproject.kafkaintegration.api.KafkaEventStorageService; |
| import org.onosproject.kafkaintegration.api.dto.OnosEvent; |
| import org.onosproject.store.service.AtomicValue; |
| import org.onosproject.store.service.StorageService; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.util.TreeMap; |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.ScheduledExecutorService; |
| import java.util.concurrent.TimeUnit; |
| |
| @Component(immediate = false) |
| public class KafkaStorageManager implements KafkaEventStorageService { |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| protected StorageService storageService; |
| |
| private TreeMap<Long, OnosEvent> kafkaEventStore; |
| |
| private AtomicValue<Long> lastPublishedEvent; |
| |
| private final Logger log = LoggerFactory.getLogger(getClass()); |
| |
| private ScheduledExecutorService gcExService; |
| |
| private InternalGarbageCollector gcTask; |
| |
| // Thread scheduler parameters. |
| private final long delay = 0; |
| private final long period = 1; |
| |
| @Activate |
| protected void activate() { |
| kafkaEventStore = new TreeMap<Long, OnosEvent>(); |
| lastPublishedEvent = storageService.<Long>atomicValueBuilder() |
| .withName("onos-app-kafka-published-seqNumber").build() |
| .asAtomicValue(); |
| |
| startGC(); |
| |
| log.info("Started"); |
| } |
| |
| private void startGC() { |
| log.info("Starting Garbage Collection Service"); |
| gcExService = Executors.newSingleThreadScheduledExecutor(); |
| gcTask = new InternalGarbageCollector(); |
| gcExService.scheduleAtFixedRate(gcTask, delay, period, |
| TimeUnit.SECONDS); |
| } |
| |
| @Deactivate |
| protected void deactivate() { |
| stopGC(); |
| log.info("Stopped"); |
| } |
| |
| private void stopGC() { |
| log.info("Stopping Garbage Collection Service"); |
| gcExService.shutdown(); |
| } |
| |
| @Override |
| public boolean insertCacheEntry(OnosEvent e) { |
| // TODO: Fill in the code once the event carries timestamp info. |
| return true; |
| } |
| |
| @Override |
| public void updateLastPublishedEntry(Long sequenceNumber) { |
| this.lastPublishedEvent.set(sequenceNumber); |
| } |
| |
| /** |
| * Removes events from the Kafka Event Store which have been published. |
| * |
| */ |
| private class InternalGarbageCollector implements Runnable { |
| |
| @Override |
| public void run() { |
| kafkaEventStore.headMap(lastPublishedEvent.get(), true).clear(); |
| } |
| } |
| |
| } |