| /* |
| * |
| * 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.hadoop.hbase.namequeues; |
| |
| import com.lmax.disruptor.EventHandler; |
| import com.lmax.disruptor.RingBuffer; |
| |
| import java.lang.reflect.InvocationTargetException; |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.hbase.namequeues.request.NamedQueueGetRequest; |
| import org.apache.hadoop.hbase.namequeues.response.NamedQueueGetResponse; |
| import org.apache.yetus.audience.InterfaceAudience; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * Event Handler run by disruptor ringbuffer consumer. |
| * Although this is generic implementation for namedQueue, it can have individual queue specific |
| * logic. |
| */ |
| @InterfaceAudience.Private |
| class LogEventHandler implements EventHandler<RingBufferEnvelope> { |
| |
| private static final Logger LOG = LoggerFactory.getLogger(LogEventHandler.class); |
| |
| // Map that binds namedQueues to corresponding queue service implementation. |
| // If NamedQueue of specific type is enabled, corresponding service will be used to |
| // insert and retrieve records. |
| // Individual queue sizes should be determined based on their individual configs within |
| // each service. |
| private final Map<NamedQueuePayload.NamedQueueEvent, NamedQueueService> namedQueueServices = |
| new HashMap<>(); |
| |
| private static final String NAMED_QUEUE_PROVIDER_CLASSES = "hbase.namedqueue.provider.classes"; |
| |
| LogEventHandler(final Configuration conf) { |
| for (String implName : conf.getStringCollection(NAMED_QUEUE_PROVIDER_CLASSES)) { |
| Class<?> clz; |
| try { |
| clz = Class.forName(implName); |
| } catch (ClassNotFoundException e) { |
| LOG.warn("Failed to find NamedQueueService implementor class {}", implName, e); |
| continue; |
| } |
| |
| if (!NamedQueueService.class.isAssignableFrom(clz)) { |
| LOG.warn("Class {} is not implementor of NamedQueueService.", clz); |
| continue; |
| } |
| |
| // add all service mappings here |
| try { |
| NamedQueueService namedQueueService = |
| (NamedQueueService) clz.getConstructor(Configuration.class).newInstance(conf); |
| namedQueueServices.put(namedQueueService.getEvent(), namedQueueService); |
| } catch (InstantiationException | IllegalAccessException | NoSuchMethodException |
| | InvocationTargetException e) { |
| LOG.warn("Unable to instantiate/add NamedQueueService implementor {} to service map.", |
| clz); |
| } |
| } |
| } |
| |
| /** |
| * Called when a publisher has published an event to the {@link RingBuffer}. |
| * This is generic consumer of disruptor ringbuffer and for each new namedQueue that we |
| * add, we should also provide specific consumer logic here. |
| * |
| * @param event published to the {@link RingBuffer} |
| * @param sequence of the event being processed |
| * @param endOfBatch flag to indicate if this is the last event in a batch from |
| * the {@link RingBuffer} |
| */ |
| @Override |
| public void onEvent(RingBufferEnvelope event, long sequence, boolean endOfBatch) { |
| final NamedQueuePayload namedQueuePayload = event.getPayload(); |
| // consume ringbuffer payload based on event type |
| namedQueueServices.get(namedQueuePayload.getNamedQueueEvent()) |
| .consumeEventFromDisruptor(namedQueuePayload); |
| } |
| |
| /** |
| * Cleans up queues maintained by services. |
| * |
| * @param namedQueueEvent type of queue to clear |
| * @return true if queue is cleaned up, false otherwise |
| */ |
| boolean clearNamedQueue(NamedQueuePayload.NamedQueueEvent namedQueueEvent) { |
| return namedQueueServices.get(namedQueueEvent).clearNamedQueue(); |
| } |
| |
| /** |
| * Add all in memory queue records to system table. The implementors can use system table |
| * or direct HDFS file or ZK as persistence system. |
| */ |
| void persistAll(NamedQueuePayload.NamedQueueEvent namedQueueEvent) { |
| namedQueueServices.get(namedQueueEvent).persistAll(); |
| } |
| |
| /** |
| * Retrieve in memory queue records from ringbuffer |
| * |
| * @param request namedQueue request with event type |
| * @return queue records from ringbuffer after filter (if applied) |
| */ |
| NamedQueueGetResponse getNamedQueueRecords(NamedQueueGetRequest request) { |
| return namedQueueServices.get(request.getNamedQueueEvent()).getNamedQueueRecords(request); |
| } |
| |
| } |