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Testing Log Position Management Implementation in Canal

This test suite implements unit testing for the abstract log position management functionality in Canal, focusing on persistence and retrieval of MySQL binary log positions. It validates core position tracking mechanisms essential for Canal’s database change capture capabilities.

Test Coverage Overview

The test suite provides comprehensive coverage of log position management operations in Canal.

Key areas tested include:

Null position handling for new destinations
Position persistence verification
Sequential position updates and retrieval
Log identity and entry position construction

Integration points cover ZooKeeper persistence and MySQL binary log position tracking.

Implementation Analysis

The testing approach employs JUnit framework with a systematic verification of position management lifecycle.

Notable patterns include:

Abstract test class inheritance for shared ZooKeeper testing infrastructure
Builder pattern for LogPosition test data construction
Assertion-based verification of position equality

Framework features utilize JUnit’s assertion utilities and test inheritance capabilities.

Technical Details

Testing tools and configuration:

JUnit testing framework
Mock MySQL connection details (127.0.0.1:3306)
ZooKeeper test infrastructure
Canal protocol position classes (EntryPosition, LogIdentity, LogPosition)
Custom position builder method for test data generation

Best Practices Demonstrated

The test implementation showcases high-quality testing practices for distributed systems.

Notable practices include:

Systematic test state management
Isolated test data generation
Clear test method organization
Comprehensive assertion coverage
Proper test inheritance structure

alibaba/canal

parse/src/test/java/com/alibaba/otter/canal/parse/index/AbstractLogPositionManagerTest.java

            
package com.alibaba.otter.canal.parse.index;

import java.net.InetSocketAddress;
import java.util.Date;

import org.junit.Assert;

import com.alibaba.otter.canal.protocol.position.EntryPosition;
import com.alibaba.otter.canal.protocol.position.LogIdentity;
import com.alibaba.otter.canal.protocol.position.LogPosition;
import org.junit.Ignore;

@Ignore
public class AbstractLogPositionManagerTest extends AbstractZkTest {

    private static final String MYSQL_ADDRESS = "127.0.0.1";

    public LogPosition doTest(CanalLogPositionManager logPositionManager) {
        LogPosition getPosition = logPositionManager.getLatestIndexBy(destination);
        Assert.assertNull(getPosition);

        LogPosition postion1 = buildPosition(1);
        logPositionManager.persistLogPosition(destination, postion1);
        LogPosition getPosition1 = logPositionManager.getLatestIndexBy(destination);
        Assert.assertEquals(postion1, getPosition1);

        LogPosition postion2 = buildPosition(2);
        logPositionManager.persistLogPosition(destination, postion2);
        LogPosition getPosition2 = logPositionManager.getLatestIndexBy(destination);
        Assert.assertEquals(postion2, getPosition2);
        return postion2;
    }

    protected LogPosition buildPosition(int number) {
        LogPosition position = new LogPosition();
        position.setIdentity(new LogIdentity(new InetSocketAddress(MYSQL_ADDRESS, 3306), 1234L));
        position.setPostion(new EntryPosition("mysql-bin.000000" + number, 106L, new Date().getTime()));
        return position;
    }
}