[CDCSDK] [#9019] CDC SDK Client API and Java Console Subscriber

Summary:

Github Master Ticket: #9019
Design DocumentL https://docs.google.com/document/d/1_xZqU5UgzCu1W--kci3ajU7_iYXXHMQvudmybDI-Xsk/edit
Functional Spec: https://docs.google.com/document/u/2/d/1nHuzHQ-qYVPbKi2dqo_drzSXMq00h7w5oi0JDf0GD1U/edit#heading=h.jmqfs7jgvvg8

This is the client-side change that exposes some APIs to be consumed by CDC consumers. Currently, these APIs are not public and are to be consumed by our Debezium connector. For testing purposes, we have written a console subscriber for testing purposes.

Test Plan:
Unit tests in java for APIs and CDC behavior.
We have done some long-running testing with applications.
We have also run the YB-sample apps and enabled CDC on the table. Verified that all the events are received.

Reviewers: nicolas, bogdan, ybase, ashetkar, nkumar, nikhil, rahuldesirazu

Reviewed By: rahuldesirazu

Subscribers: vkushwaha, srangavajjula

Differential Revision: https://phabricator.dev.yugabyte.com/D13836

Author: suranjan

java/yb-cdc/pom.xml

@@ -28,16 +28,17 @@
     <dependency>
       <groupId>org.apache.kafka</groupId>
       <artifactId>kafka-clients</artifactId>
-      <version>2.8.1</version>
+      <version>2.3.0</version>
     </dependency>
     <dependency>
       <groupId>org.apache.avro</groupId>
       <artifactId>avro</artifactId>
-      <version>1.10.2</version>
+      <version>1.9.0</version>
     </dependency>
     <dependency>
       <groupId>commons-io</groupId>
       <artifactId>commons-io</artifactId>
+      <version>2.5</version>
     </dependency>
     <dependency>
       <groupId>org.yb</groupId>
@@ -69,10 +70,12 @@
     <dependency>
       <groupId>commons-cli</groupId>
       <artifactId>commons-cli</artifactId>
+      <version>1.2</version>
     </dependency>
     <dependency>
       <groupId>commons-codec</groupId>
       <artifactId>commons-codec</artifactId>
+      <version>1.10</version>
     </dependency>
     <dependency>
       <groupId>org.apache.commons</groupId>
@@ -83,6 +86,33 @@
       <artifactId>gson</artifactId>
       <version>2.8.0</version>
     </dependency>
+    <dependency>
+      <groupId>org.postgresql</groupId>
+      <artifactId>postgresql</artifactId>
+      <version>42.2.23</version>
+    </dependency>
+    <dependency>
+      <groupId>org.mybatis</groupId>
+      <artifactId>mybatis</artifactId>
+      <version>3.4.5</version>
+    </dependency>
+    <!-- dependency for YCQL driver -->
+    <dependency>
+      <groupId>com.yugabyte</groupId>
+      <artifactId>java-driver-core</artifactId>
+      <version>4.6.0-yb-6</version>
+    </dependency>
+    <!-- dependency for smart jdbc driver yugabyte -->
+    <dependency>
+      <groupId>com.yugabyte</groupId>
+      <artifactId>jdbc-yugabytedb</artifactId>
+      <version>42.3.0-beta.1</version>
+    </dependency>
+    <dependency>
+      <groupId>${junit.groupId}</groupId>
+      <artifactId>junit</artifactId>
+      <scope>test</scope>
+    </dependency>
   </dependencies>
 
   <build>
@@ -114,6 +144,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-dependency-plugin</artifactId>
+        <version>3.2.0</version>
         <executions>
           <execution>
             <id>copy-dependencies</id>
@@ -134,13 +165,14 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-assembly-plugin</artifactId>
+        <version>3.3.0</version>
         <configuration>
           <finalName>yb-cdc-connector</finalName>
           <appendAssemblyId>false</appendAssemblyId>
           <archive>
             <manifest>
               <addClasspath>true</addClasspath>
-              <mainClass>org.yb.cdc.Main</mainClass>
+              <mainClass>org.yb.cdc.CDCConsoleSubscriber</mainClass>
             </manifest>
           </archive>
           <descriptorRefs>
@@ -166,6 +198,14 @@
           <preparationGoals>clean verify</preparationGoals>
         </configuration>
       </plugin>
+      <plugin>
+        <artifactId>maven-surefire-plugin</artifactId>
+        <version>2.22.1</version>
+      </plugin>
+      <plugin>
+        <artifactId>maven-jar-plugin</artifactId>
+        <version>3.0.2</version>
+      </plugin>
     </plugins>
   </build>
 </project>

java/yb-cdc/src/main/java/org/yb/cdc/CDCConsoleSubscriber.java

@@ -0,0 +1,58 @@
+// Copyright (c) YugaByte, Inc.
+//
+// Licensed 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.yb.cdc;
+
+import org.apache.log4j.*;
+
+public class CDCConsoleSubscriber {
+  private static final Logger LOG = Logger.getLogger(CDCConsoleSubscriber.class);
+
+  private ConcurrentLogConnector connector;
+
+  public CDCConsoleSubscriber(CmdLineOpts cmdLineOpts, OutputClient opClient) throws Exception {
+    connector = new ConcurrentLogConnector(cmdLineOpts, opClient);
+  }
+
+  public void run() {
+    try {
+      connector.run();
+    } catch (Exception e) {
+      e.printStackTrace();
+      LOG.error("Application ran into an error: ", e);
+      System.exit(0);
+    }
+  }
+
+  public void close() {
+    try {
+      connector.close();
+    } catch (Exception e) {
+      System.exit(0);
+    }
+  }
+
+  public static void main(String[] args) throws Exception {
+    LOG.info("Starting CDC Console Connector...");
+
+    CmdLineOpts configuration = CmdLineOpts.createFromArgs(args);
+    try {
+      CDCConsoleSubscriber subscriber = new CDCConsoleSubscriber(configuration, new LogClient());
+      subscriber.run();
+    }
+    catch (Exception e) {
+      e.printStackTrace();
+      System.exit(1);
+    }
+  }
+}