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Testing Mixed Log Position Management Integration in Alibaba Canal

This test suite validates the MixedLogPositionManager implementation in Canal, focusing on log position management across distributed systems using ZooKeeper. It verifies the persistence and retrieval of log positions while handling multiple manager instances.

Test Coverage Overview

The test suite provides comprehensive coverage of the MixedLogPositionManager functionality.

Key areas tested include:

Log position persistence across multiple manager instances
ZooKeeper integration for distributed state management
Memory and ZooKeeper position manager synchronization
Clean setup and teardown of test environment

Implementation Analysis

The testing approach employs JUnit 4 framework with a systematic setup-execute-verify pattern. The implementation leverages ZooKeeper for distributed coordination, utilizing both in-memory and persistent storage mechanisms.

Notable patterns include:

Before/After test lifecycle hooks for environment management
Multiple manager instance testing for distributed scenarios
Assertion-based verification of position consistency

Technical Details

Testing infrastructure includes:

JUnit 4 testing framework
ZkClientx for ZooKeeper interaction
Custom AbstractLogPositionManagerTest base class
ZookeeperPathUtils for path management
Multiple cluster configuration support

Best Practices Demonstrated

The test suite exemplifies several testing best practices.

Notable aspects include:

Proper test isolation through setup/teardown methods
Comprehensive verification of distributed system behavior
Resource cleanup after test execution
Clear separation of concerns between different position manager implementations

alibaba/canal

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

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

import org.junit.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Ignore;
import org.junit.Test;

import com.alibaba.otter.canal.common.zookeeper.ZkClientx;
import com.alibaba.otter.canal.common.zookeeper.ZookeeperPathUtils;
import com.alibaba.otter.canal.protocol.position.LogPosition;
@Ignore
public class MixedLogPositionManagerTest extends AbstractLogPositionManagerTest {

    private ZkClientx zkclientx = new ZkClientx(cluster1 + ";" + cluster2);

    @Before
    public void setUp() {
        String path = ZookeeperPathUtils.getDestinationPath(destination);
        zkclientx.deleteRecursive(path);
    }

    @After
    public void tearDown() {
        String path = ZookeeperPathUtils.getDestinationPath(destination);
        zkclientx.deleteRecursive(path);
    }

    @Test
    public void testAll() {
        MemoryLogPositionManager memoryLogPositionManager = new MemoryLogPositionManager();
        ZooKeeperLogPositionManager zookeeperLogPositionManager = new ZooKeeperLogPositionManager(zkclientx);

        MixedLogPositionManager logPositionManager = new MixedLogPositionManager(zkclientx);
        logPositionManager.start();

        LogPosition position2 = doTest(logPositionManager);
        sleep(1000);

        MixedLogPositionManager logPositionManager2 = new MixedLogPositionManager(zkclientx);
        logPositionManager2.start();

        LogPosition getPosition2 = logPositionManager2.getLatestIndexBy(destination);
        Assert.assertEquals(position2, getPosition2);

        logPositionManager.stop();
        logPositionManager2.stop();
    }
}