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https://issues.apache.org/jira/browse/NIFI-3413?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15943379#comment-15943379
]
ASF GitHub Bot commented on NIFI-3413:
--------------------------------------
Github user mattyb149 commented on a diff in the pull request:
https://github.com/apache/nifi/pull/1618#discussion_r108187176
--- Diff:
nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/db/impl/mysql/event/io/InsertRowsWriter.java
---
@@ -0,0 +1,90 @@
+/*
+ * 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.standard.db.impl.mysql.event.io;
+
+import org.apache.nifi.flowfile.FlowFile;
+import org.apache.nifi.processor.ProcessSession;
+import org.apache.nifi.processors.standard.GetChangeDataCaptureMySQL;
+import org.apache.nifi.processors.standard.db.event.ColumnDefinition;
+import
org.apache.nifi.processors.standard.db.impl.mysql.event.InsertRowsEventInfo;
+
+import java.io.IOException;
+import java.io.Serializable;
+import java.util.BitSet;
+import java.util.concurrent.atomic.AtomicLong;
+
+import static
org.apache.nifi.processors.standard.db.impl.mysql.MySQLCDCUtils.getWritableObject;
+
+/**
+ * A writer class to output MySQL binlog "write rows" (aka INSERT) events
to flow file(s).
+ */
+public class InsertRowsWriter extends
AbstractBinlogTableEventWriter<InsertRowsEventInfo> {
+
+ /**
+ * Creates and transfers a new flow file whose contents are the
JSON-serialized value of the specified event, and the sequence ID attribute set
+ *
+ * @param session A reference to a ProcessSession from which the
flow file(s) will be created and transferred
+ * @param eventInfo An event whose value will become the contents of
the flow file
+ * @return The next available CDC sequence ID for use by the CDC
processor
+ */
+ public long writeEvent(final ProcessSession session, final
InsertRowsEventInfo eventInfo, final long currentSequenceId) {
+ final AtomicLong seqId = new AtomicLong(currentSequenceId);
+ for (Serializable[] row : eventInfo.getRows()) {
+
+ FlowFile flowFile = session.create();
+ flowFile = session.write(flowFile, outputStream -> {
+
+ super.startJson(outputStream, eventInfo);
+ super.writeJson(eventInfo);
+
+ final BitSet bitSet = eventInfo.getIncludedColumns();
+ writeRow(eventInfo, row, bitSet);
+
+ super.endJson();
+ });
+
+ flowFile = session.putAllAttributes(flowFile,
getCommonAttributes(seqId.get(), eventInfo));
+ session.transfer(flowFile,
GetChangeDataCaptureMySQL.REL_SUCCESS);
+ seqId.getAndIncrement();
+ }
+ return seqId.get();
+ }
+
+ protected void writeRow(InsertRowsEventInfo event, Serializable[] row,
BitSet includedColumns) throws IOException {
+ jsonGenerator.writeArrayFieldStart("columns");
+ int i = includedColumns.nextSetBit(0);
+ while (i != -1) {
+ jsonGenerator.writeStartObject();
+ jsonGenerator.writeNumberField("id", i + 1);
+ ColumnDefinition columnDefinition = event.getColumnByIndex(i);
+ Integer columnType = null;
+ if (columnDefinition != null) {
+ jsonGenerator.writeStringField("name",
columnDefinition.getName());
+ columnType = (int) columnDefinition.getType();
--- End diff --
Per the above comment/response, I've changed the getType() method to return
an int, I only use Integer in case we don't have a column definition, then we
can write "null" as the value for the column type. I'd prefer to use the JDBC
Types constants rather than our own enum, as that is what will be used 99% of
the time.
> Implement a GetChangeDataCapture processor
> ------------------------------------------
>
> Key: NIFI-3413
> URL: https://issues.apache.org/jira/browse/NIFI-3413
> Project: Apache NiFi
> Issue Type: New Feature
> Components: Extensions
> Reporter: Matt Burgess
> Assignee: Matt Burgess
>
> Database systems such as MySQL, Oracle, and SQL Server allow access to their
> transactional logs and such, in order for external clients to have a "change
> data capture" (CDC) capability. I propose a GetChangeDataCapture processor to
> enable this in NiFi.
> The processor would be configured with a DBCPConnectionPool controller
> service, as well as a Database Type property (similar to the one in
> QueryDatabaseTable) for database-specific handling. Additional properties
> might include the CDC table name, etc. Additional database-specific
> properties could be handled using dynamic properties (and the documentation
> should reflect this).
> The processor would accept no incoming connections (it is a "Get" or source
> processor), would be intended to run on the primary node only as a single
> threaded processor, and would generate a flow file for each operation
> (INSERT, UPDATE, DELETE, e,g,) in one or some number of formats (JSON, e.g.).
> The flow files would be transferred in time order (to enable a replication
> solution, for example), perhaps with some auto-incrementing attribute to also
> indicate order if need be.
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