[GitHub] [nifi] mattyb149 commented on a change in pull request #4065: NIFI-4239 - Adding CaptureChangePostgreSQL processor to capture data changes (INSERT/UPDATE/DELETE) in PostgreSQL tables via Logical Replication.

[GitBox <gi...@apache.org>]

mattyb149 commented on a change in pull request #4065: NIFI-4239 - Adding CaptureChangePostgreSQL processor to capture data changes (INSERT/UPDATE/DELETE) in PostgreSQL tables via Logical Replication.
URL: https://github.com/apache/nifi/pull/4065#discussion_r383569647
 
 

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 File path: nifi-nar-bundles/nifi-cdc/nifi-cdc-postgresql-bundle/nifi-cdc-postgresql-processors/src/main/java/org/apache/nifi/cdc/postgresql/pgEasyReplication/PGEasyReplication.java
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+/*
+ * 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.cdc.postgresql.pgEasyReplication;
+
+import java.io.IOException;
+import java.io.UnsupportedEncodingException;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.text.ParseException;
+import org.postgresql.PGConnection;
+
+import org.apache.nifi.cdc.postgresql.pgEasyReplication.Event;
+import org.apache.nifi.cdc.postgresql.pgEasyReplication.Snapshot;
+
+public class PGEasyReplication {
+
+    private String publication;
+    private String slot;
+    private boolean slotDropIfExists;
+    private Stream stream;
+
+    public PGEasyReplication(String pub, String slt, boolean sltDropIfExists) {
+        this.publication = pub;
+        this.slot = slt;
+        this.slotDropIfExists = sltDropIfExists;
+    }
+
+    public void initializeLogicalReplication() {
+        try {
+            PreparedStatement stmt = ConnectionManager.getSQLConnection().prepareStatement("select 1 from pg_catalog.pg_replication_slots WHERE slot_name = ?");
+
+            stmt.setString(1, this.slot);
+            ResultSet rs = stmt.executeQuery();
+
+            if (rs.next()) { // If slot exists
+                if (this.slotDropIfExists) {
+                    this.dropReplicationSlot();
+                    this.createReplicationSlot();
+                }
+            } else {
+                this.createReplicationSlot();
+            }
+
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+    }
+
+    public void createReplicationSlot() {
+        try {
+            PGConnection pgcon = ConnectionManager.getReplicationConnection().unwrap(PGConnection.class);
+            // More details about pgoutput options: https://github.com/postgres/postgres/blob/master/src/backend/replication/pgoutput/pgoutput.c
 
 Review comment:
   This might end up being a dead link someday, perhaps just mention the file name and the postgres repo on GitHub? Not that big a deal, just mentioning it in passing

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