Github user david-streamlio commented on a diff in the pull request:
https://github.com/apache/nifi/pull/2702#discussion_r197625631
--- Diff:
nifi-nar-bundles/nifi-pulsar-bundle/nifi-pulsar-processors/src/main/java/org/apache/nifi/processors/pulsar/pubsub/PublishPulsar.java
---
@@ -0,0 +1,103 @@
+/*
+ * 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.nifi.processors.pulsar.pubsub;
+
+import java.io.ByteArrayOutputStream;
+
+import org.apache.nifi.annotation.behavior.InputRequirement;
+import org.apache.nifi.annotation.behavior.WritesAttribute;
+import org.apache.nifi.annotation.documentation.CapabilityDescription;
+import org.apache.nifi.annotation.documentation.Tags;
+import org.apache.nifi.flowfile.FlowFile;
+import org.apache.nifi.logging.ComponentLog;
+import org.apache.nifi.processor.ProcessContext;
+import org.apache.nifi.processor.ProcessSession;
+import org.apache.nifi.processor.exception.ProcessException;
+import org.apache.nifi.processors.pulsar.AbstractPulsarProducerProcessor;
+import org.apache.nifi.util.StringUtils;
+import org.apache.pulsar.client.api.MessageId;
+import org.apache.pulsar.client.api.Producer;
+import org.apache.pulsar.client.api.PulsarClientException;
+
+@Tags({"Apache", "Pulsar", "Put", "Send", "Message", "PubSub"})
+@CapabilityDescription("Sends the contents of a FlowFile as a message to
Apache Pulsar using the Pulsar 1.X Producer API."
+ + "The messages to send may be individual FlowFiles or may be
delimited, using a "
+ + "user-specified delimiter, such as a new-line. "
+ + "The complementary NiFi processor for fetching messages is
ConsumePulsar.")
+@InputRequirement(InputRequirement.Requirement.INPUT_REQUIRED)
+@WritesAttribute(attribute = "msg.count", description = "The number of
messages that were sent to Pulsar for this FlowFile. This attribute is added
only to "
+ + "FlowFiles that are routed to success.")
+public class PublishPulsar extends AbstractPulsarProducerProcessor<byte[]>
{
+
+ @Override
+ public void onTrigger(ProcessContext context, ProcessSession session)
throws ProcessException {
+ FlowFile flowFile = session.get();
+
+ if (flowFile == null) {
+ return;
+ }
+
+ final ComponentLog logger = getLogger();
+ final String topic =
context.getProperty(TOPIC).evaluateAttributeExpressions(flowFile).getValue();
+
+ if (StringUtils.isBlank(topic)) {
+ logger.error("Invalid topic specified {}", new Object[]
{topic});
+ session.transfer(flowFile, REL_FAILURE);
+ return;
+ }
+
+ // Read the contents of the FlowFile into a byte array
+ ByteArrayOutputStream baos = new ByteArrayOutputStream();
+ session.exportTo(flowFile, baos);
+
+ final byte[] messageContent = baos.toByteArray();
+ // Nothing to do, so skip this Flow file.
+ if (messageContent == null || messageContent.length < 1) {
+ session.putAttribute(flowFile, "msg.count", "0");
+ session.transfer(flowFile, REL_SUCCESS);
+ return;
+ }
+
+ try {
+ Producer<byte[]> producer = getProducer(context, topic);
+
+ if (context.getProperty(ASYNC_ENABLED).asBoolean()) {
+ sendAsync(producer, session, messageContent);
+ session.remove(flowFile);
--- End diff --
Since we are operating in async mode at this point, If we transfer to
success, we can't later transfer it to failure if there was a connection
failure etc.
How would you advise I handle that scenario? If we have already routed the
Flowfile to success, how will the user be able to retry the FF again after the
connection problem is resolved?
---
