sijie commented on a change in pull request #3379: Issue #3378: [pulsar-io] Support Pulsar to receive and send data from Apache NiFi URL: https://github.com/apache/pulsar/pull/3379#discussion_r248701799
########## File path: pulsar-io/nifi/src/main/java/org/apache/pulsar/io/nifi/NiFiSource.java ########## @@ -0,0 +1,169 @@ +/** + * 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.pulsar.io.nifi; + +import lombok.extern.slf4j.Slf4j; +import org.apache.nifi.remote.Transaction; +import org.apache.nifi.remote.TransferDirection; +import org.apache.nifi.remote.client.SiteToSiteClient; +import org.apache.nifi.remote.client.SiteToSiteClientConfig; +import org.apache.nifi.remote.protocol.DataPacket; +import org.apache.nifi.stream.io.StreamUtils; +import org.apache.pulsar.functions.api.Record; +import org.apache.pulsar.io.core.PushSource; +import org.apache.pulsar.io.core.SourceContext; +import org.apache.pulsar.io.core.annotations.Connector; +import org.apache.pulsar.io.core.annotations.IOType; + +import java.io.IOException; +import java.io.InputStream; +import java.util.ArrayList; +import java.util.List; +import java.util.Map; + + +/** + * A source that pulls data from Apache NiFi using the NiFi Site-to-Site client. This source + * produces NiFiDataPackets which encapsulate the content and attributes of a NiFi FlowFile. + */ +@Connector( + name = "nifi", + type = IOType.SOURCE, + help = "A simple connector to move messages from Apache NiFi using the NiFi Site-to-Site client to a Pulsar topic", + configClass = NiFiConfig.class) +@Slf4j +public class NiFiSource extends PushSource<NiFiDataPacket> { + + private long waitTimeMs; + private volatile boolean isRunning = true; + private NiFiConfig niFiConfig; + private SiteToSiteClientConfig clientConfig; + + Thread runnerThread; + + @Override + public void open(Map<String, Object> config, SourceContext sourceContext) throws Exception { + niFiConfig = NiFiConfig.load(config); + if (niFiConfig.getUrl() == null + || niFiConfig.getPortName() == null) { + throw new IllegalArgumentException("Required property not set."); + } + + waitTimeMs = niFiConfig.getWaitTimeMs(); + clientConfig = new SiteToSiteClient.Builder() + .url(niFiConfig.getUrl()) + .portName(niFiConfig.getPortName()) + .requestBatchCount(niFiConfig.getRequestBatchCount()) + .buildConfig(); + + this.start(); + } + + @Override + public void close() throws Exception { + this.isRunning = false; + if (runnerThread != null) { + runnerThread.interrupt(); + runnerThread.join(); + runnerThread = null; + } + } + + protected void start() throws Exception { + runnerThread = new Thread(new ReceiveRunnable()); + runnerThread.setName("Nifi Source Thread"); + runnerThread.start(); + } + + + class ReceiveRunnable implements Runnable { + + public ReceiveRunnable() { + } + + @Override + public void run() { + try { + final SiteToSiteClient client = new SiteToSiteClient.Builder().fromConfig(clientConfig).build(); + try { + while (isRunning) { + final Transaction transaction = client.createTransaction(TransferDirection.RECEIVE); + DataPacket dataPacket = transaction.receive(); + if (dataPacket == null) { + transaction.confirm(); + transaction.complete(); + + // no data available. Wait a bit and try again + try { + Thread.sleep(waitTimeMs); + } catch (InterruptedException e) { + } Review comment: nit: can you add a logging message? ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org With regards, Apache Git Services
