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From GitBox <...@apache.org>
Subject [GitHub] sijie commented on a change in pull request #3379: Issue #3378: [pulsar-io] Support Pulsar to receive and send data from Apache NiFi
Date Mon, 28 Jan 2019 19:43:34 GMT
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_r251563529
 
 

 ##########
 File path: pulsar-io/nifi/src/main/java/org/apache/pulsar/io/nifi/NiFiSink.java
 ##########
 @@ -0,0 +1,156 @@
+/**
+ * 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 com.google.common.base.Preconditions;
+import com.google.common.collect.Lists;
+import lombok.extern.slf4j.Slf4j;
+import org.apache.commons.collections.CollectionUtils;
+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.pulsar.functions.api.Record;
+import org.apache.pulsar.io.core.Sink;
+import org.apache.pulsar.io.core.SinkContext;
+import org.apache.pulsar.io.core.annotations.Connector;
+import org.apache.pulsar.io.core.annotations.IOType;
+
+import java.io.IOException;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.Executors;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.TimeUnit;
+
+
+/**
+ * A sink that delivers data to Apache NiFi using the NiFi Site-to-Site client. The sink
requires
+ * a NiFiDataPacketBuilder which can create instances of NiFiDataPacket from the incoming
data.
+ */
+@Connector(
+    name = "nifi",
+    type = IOType.SINK,
+    help = "The NiFiSink is used for moving messages from Pulsar to Apache NiFi using the
NiFi Site-to-Site client.",
+    configClass = NiFiConfig.class
+)
+@Slf4j
+public class NiFiSink implements Sink<NiFiDataPacket> {
+
+    private NiFiConfig niFiConfig;
+    private SiteToSiteClientConfig clientConfig;
+    private SiteToSiteClient client;
+
+    private int requestBatchCount;
+    private long waitTimeMs;
+    private List<Record<NiFiDataPacket>>  currentList;
+    private ScheduledExecutorService flushExecutor;
+
+    @Override
+    public void open(Map<String, Object> config, SinkContext sinkContext) throws Exception
{
+        niFiConfig = NiFiConfig.load(config);
+        Preconditions.checkNotNull(niFiConfig.getUrl(), "url property not set.");
+        Preconditions.checkNotNull(niFiConfig.getPortName(), "portName property not set.");
+        Preconditions.checkArgument(niFiConfig.getRequestBatchCount() > 0,
+                "requestBatchCount must be a positive integer.");
+
+        clientConfig = new SiteToSiteClient.Builder()
+                .url(niFiConfig.getUrl())
+                .portName(niFiConfig.getPortName())
+                .requestBatchCount(niFiConfig.getRequestBatchCount())
+                .buildConfig();
+        client = new SiteToSiteClient.Builder().fromConfig(clientConfig).build();
+
+        requestBatchCount = niFiConfig.getRequestBatchCount();
+        waitTimeMs = niFiConfig.getWaitTimeMs();
+        currentList= Lists.newArrayList();
+
+        flushExecutor = Executors.newScheduledThreadPool(1);
+        flushExecutor.scheduleAtFixedRate(() -> flush(), waitTimeMs, waitTimeMs, TimeUnit.MILLISECONDS);
+    }
+
+    @Override
+    public void close() throws Exception {
+        if (null != client) {
+            client.close();
+        }
+
+        if (null != flushExecutor) {
+            flushExecutor.shutdown();
+        }
+
+    }
+
+    @Override
+    public void write(Record<NiFiDataPacket> record) {
+        int number;
+        synchronized (this) {
+            if (null != record) {
+                currentList.add(record);
+            }
+            number = currentList.size();
+        }
+
+        if (number == requestBatchCount) {
+            flushExecutor.submit(() -> flush());
+        }
+    }
+
+    private void flush() {
+        List<Record<NiFiDataPacket>>  toFlushList;
+        synchronized (this) {
+            if (currentList.isEmpty()) {
+                return;
+            }
+            toFlushList = currentList;
+            currentList = Lists.newArrayList();
+        }
+
+        Transaction transaction = null;
+        try {
+            transaction = client.createTransaction(TransferDirection.SEND);
+        } catch (IOException ioe) {
+            log.warn("Created NiFi transaction Failed", ioe);
 
 Review comment:
   if we failed to create transaction, we have to error out the `toFlushList`.

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