[
https://issues.apache.org/jira/browse/FLINK-2740?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14939651#comment-14939651
]
ASF GitHub Bot commented on FLINK-2740:
---------------------------------------
Github user rmetzger commented on a diff in the pull request:
https://github.com/apache/flink/pull/1198#discussion_r40899297
--- Diff:
flink-staging/flink-streaming/flink-streaming-connectors/flink-connector-nifi/src/main/java/org/apache/flink/streaming/connectors/nifi/NiFiSource.java
---
@@ -0,0 +1,119 @@
+/*
+ * 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.flink.streaming.connectors.nifi;
+
+import org.apache.flink.configuration.Configuration;
+import
org.apache.flink.streaming.api.functions.source.RichParallelSourceFunction;
+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.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+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.
+ */
+public class NiFiSource extends RichParallelSourceFunction<NiFiDataPacket>
{
+
+ private static final Logger LOG =
LoggerFactory.getLogger(NiFiSource.class);
+
+ private SiteToSiteClient client;
+ private SiteToSiteClientConfig clientConfig;
+ private transient volatile boolean running;
+
+ public NiFiSource(SiteToSiteClientConfig clientConfig) {
+ this.clientConfig = clientConfig;
+ }
+
+ @Override
+ public void open(Configuration parameters) throws Exception {
+ super.open(parameters);
+ client = new
SiteToSiteClient.Builder().fromConfig(clientConfig).build();
+ running = true;
+ }
+
+ @Override
+ public void run(SourceContext<NiFiDataPacket> ctx) throws Exception {
+ while (running) {
+ 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(1000L);
+ } catch (InterruptedException e) {
+
+ }
+ continue;
+ }
+
+ final List<NiFiDataPacket> niFiDataPackets = new
ArrayList<>();
+ do {
+ // Read the data into a byte array and wrap it
along with the attributes
+ // into a NiFiDataPacket.
+ final InputStream inStream =
dataPacket.getData();
+ final byte[] data = new byte[(int)
dataPacket.getSize()];
+ StreamUtils.fillBuffer(inStream, data);
+
+ final Map<String, String> attributes =
dataPacket.getAttributes();
+
+ niFiDataPackets.add(new
StandardNiFiDataPacket(data, attributes));
+ dataPacket = transaction.receive();
+ } while (dataPacket != null);
+
+ // Confirm transaction to verify the data
+ transaction.confirm();
+
+ for (NiFiDataPacket dp : niFiDataPackets) {
+ ctx.collect(dp);
+ }
+
+ transaction.complete();
+ }
+ }
+
+ @Override
+ public void cancel() {
+ running = false;
+ }
+
+ @Override
+ public void close() throws Exception {
+ super.close();
+ try {
+ client.close();
+ } catch (final IOException ioe) {
+ LOG.error("Unable to close SiteToSiteClient: " +
ioe.getMessage());
--- End diff --
Same here. Flink can handle the Exception
> Create data consumer for Apache NiFi
> ------------------------------------
>
> Key: FLINK-2740
> URL: https://issues.apache.org/jira/browse/FLINK-2740
> Project: Flink
> Issue Type: New Feature
> Components: Streaming Connectors
> Reporter: Kostas Tzoumas
> Assignee: Joseph Witt
>
> Create a connector to Apache NiFi to create Flink DataStreams from NiFi flows
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
