/**
* Copyright 2016 Yahoo Inc.
*
* 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 com.yahoo.pulsar.spark;
import org.apache.spark.storage.StorageLevel;
import org.apache.spark.streaming.receiver.Receiver;
import com.yahoo.pulsar.client.api.ClientConfiguration;
import com.yahoo.pulsar.client.api.Consumer;
import com.yahoo.pulsar.client.api.ConsumerConfiguration;
import com.yahoo.pulsar.client.api.Message;
import com.yahoo.pulsar.client.api.MessageListener;
import com.yahoo.pulsar.client.api.PulsarClient;
import com.yahoo.pulsar.client.api.PulsarClientException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.concurrent.TimeUnit;
public class SparkStreamingPulsarReceiver extends Receiver<byte[]> {
private ClientConfiguration clientConfiguration;
private ConsumerConfiguration consumerConfiguration;
private PulsarClient pulsarClient;
private String url;
private String topic;
private String subscription;
public SparkStreamingPulsarReceiver(ClientConfiguration clientConfiguration,
ConsumerConfiguration consumerConfiguration, String url, String topic, String subscription) {
this(StorageLevel.MEMORY_AND_DISK_2(), clientConfiguration, consumerConfiguration, url, topic, subscription);
}
public SparkStreamingPulsarReceiver(StorageLevel storageLevel, ClientConfiguration clientConfiguration,
ConsumerConfiguration consumerConfiguration, String url, String topic, String subscription) {
super(storageLevel);
this.clientConfiguration = clientConfiguration;
this.url = url;
this.topic = topic;
this.subscription = subscription;
if (consumerConfiguration.getAckTimeoutMillis() == 0) {
consumerConfiguration.setAckTimeout(60, TimeUnit.SECONDS);
}
consumerConfiguration.setMessageListener((consumer, msg) -> {
try {
store(msg.getData());
consumer.acknowledgeAsync(msg);
} catch (Exception e) {
log.error("Failed to store a message : {}", e.getMessage());
}
});
this.consumerConfiguration = consumerConfiguration;
}
public void onStart() {
try {
pulsarClient = PulsarClient.create(url, clientConfiguration);
pulsarClient.subscribe(topic, subscription, consumerConfiguration);
} catch (PulsarClientException e) {
log.error("Failed to start subscription : {}", e.getMessage());
restart("Restart a consumer");
}
}
public void onStop() {
try {
if (pulsarClient != null) {
pulsarClient.close();
}
} catch (PulsarClientException e) {
log.error("Failed to close client : {}", e.getMessage());
}
}
private static final Logger log = LoggerFactory.getLogger(SparkStreamingPulsarReceiver.class);
}