NIFI-927: Use a serializable version of NiFiDataPacket in the spark receiver

nifi-external/nifi-spark-receiver/src/main/java/org/apache/nifi/spark/NiFiReceiver.java

@@ -170,18 +170,7 @@ public class NiFiReceiver extends Receiver<NiFiDataPacket> {
                             StreamUtils.fillBuffer(inStream, data);
 
                             final Map<String, String> attributes = dataPacket.getAttributes();
-                            final NiFiDataPacket NiFiDataPacket = new NiFiDataPacket() {
+                            final NiFiDataPacket NiFiDataPacket = new StandardNiFiDataPacket(data, attributes);
-                                @Override
-                                public byte[] getContent() {
-                                    return data;
-                                }
-
-                                @Override
-                                public Map<String, String> getAttributes() {
-                                    return attributes;
-                                }
-                            };
-
                             dataPackets.add(NiFiDataPacket);
                             dataPacket = transaction.receive();
                         } while (dataPacket != null);

nifi-external/nifi-spark-receiver/src/main/java/org/apache/nifi/spark/StandardNiFiDataPacket.java

@@ -0,0 +1,43 @@
+/*
+ * 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.spark;
+
+import java.io.Serializable;
+import java.util.Map;
+
+public class StandardNiFiDataPacket implements NiFiDataPacket, Serializable {
+    private static final long serialVersionUID = 6364005260220243322L;
+
+    private final byte[] content;
+    private final Map<String, String> attributes;
+
+    public StandardNiFiDataPacket(final byte[] content, final Map<String, String> attributes) {
+        this.content = content;
+        this.attributes = attributes;
+    }
+
+    @Override
+    public byte[] getContent() {
+        return content;
+    }
+
+    @Override
+    public Map<String, String> getAttributes() {
+        return attributes;
+    }
+
+}