Github user vesense commented on a diff in the pull request:
https://github.com/apache/storm/pull/2024#discussion_r111551137
--- Diff:
external/storm-rocketmq/src/main/java/org/apache/storm/rocketmq/spout/RocketMQSpout.java
---
@@ -0,0 +1,189 @@
+/**
+ * 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.storm.rocketmq.spout;
+
+import org.apache.commons.lang.Validate;
+import org.apache.rocketmq.client.consumer.DefaultMQPushConsumer;
+import org.apache.rocketmq.client.consumer.MQPushConsumer;
+import
org.apache.rocketmq.client.consumer.listener.ConsumeConcurrentlyContext;
+import
org.apache.rocketmq.client.consumer.listener.ConsumeConcurrentlyStatus;
+import org.apache.rocketmq.client.consumer.listener.ConsumeOrderlyContext;
+import org.apache.rocketmq.client.consumer.listener.ConsumeOrderlyStatus;
+import
org.apache.rocketmq.client.consumer.listener.MessageListenerConcurrently;
+import org.apache.rocketmq.client.consumer.listener.MessageListenerOrderly;
+import org.apache.rocketmq.client.exception.MQClientException;
+import org.apache.rocketmq.common.message.MessageExt;
+import org.apache.storm.Config;
+import org.apache.storm.rocketmq.DefaultMessageRetryManager;
+import org.apache.storm.rocketmq.MessageRetryManager;
+import org.apache.storm.rocketmq.MessageSet;
+import org.apache.storm.rocketmq.RocketMQConfig;
+import org.apache.storm.rocketmq.SpoutConfig;
+import org.apache.storm.spout.SpoutOutputCollector;
+import org.apache.storm.task.TopologyContext;
+import org.apache.storm.topology.IRichSpout;
+import org.apache.storm.topology.OutputFieldsDeclarer;
+import org.apache.storm.tuple.Fields;
+import org.apache.storm.tuple.Values;
+import org.apache.storm.utils.ObjectReader;
+
+import java.util.List;
+import java.util.Map;
+import java.util.Properties;
+import java.util.concurrent.BlockingQueue;
+import java.util.concurrent.LinkedBlockingQueue;
+
+import static org.apache.storm.rocketmq.RocketMQUtils.getBoolean;
+import static org.apache.storm.rocketmq.RocketMQUtils.getInteger;
+
+/**
+ * RocketMQSpout uses MQPushConsumer as the default implementation.
+ * PushConsumer is a high level consumer API, wrapping the pulling details
+ * Looks like broker push messages to consumer
+ */
+public class RocketMQSpout implements IRichSpout {
+ // TODO add metrics
+
+ private static MQPushConsumer consumer;
+ private SpoutOutputCollector collector;
+ private BlockingQueue<MessageSet> queue;
+
+ private Properties properties;
+ private MessageRetryManager messageRetryManager;
+
+ public RocketMQSpout(Properties properties) {
+ this.properties = properties;
+ }
+
+ @Override
+ public void open(Map conf, TopologyContext context,
SpoutOutputCollector collector) {
+ Validate.notEmpty(properties, "Consumer properties can not be
empty");
+ boolean ordered = getBoolean(properties,
RocketMQConfig.CONSUMER_MESSAGES_ORDERLY, false);
+
+ int queueSize = getInteger(properties, SpoutConfig.QUEUE_SIZE,
ObjectReader.getInt(conf.get(Config.TOPOLOGY_MAX_SPOUT_PENDING)));
+ queue = new LinkedBlockingQueue<>(queueSize);
+
+ // Since RocketMQ Consumer is thread-safe, RocketMQSpout uses a
single
+ // consumer instance across threads to improve the performance.
+ synchronized (RocketMQSpout.class) {
+ if (consumer == null) {
+ consumer = new DefaultMQPushConsumer();
+ RocketMQConfig.buildConsumerConfigs(properties,
(DefaultMQPushConsumer)consumer);
+
+ if (ordered) {
+ consumer.registerMessageListener(new
MessageListenerOrderly() {
--- End diff --
In fact, the RocketMQ "push" mode is still pulling data from broker.
PushConsumer is a high level consumer API, wrapping the pulling details, looks
like broker push messages to consumer.
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