Back to Repositories

Testing Spring Memory Instance Generation in Canal

A comprehensive unit test suite for validating the Spring-based memory instance functionality in Canal, focusing on instance generation and lifecycle management. The test suite ensures proper initialization, execution, and cleanup of Canal instances within a Spring context.

Test Coverage Overview

The test suite provides coverage for Canal’s memory-based instance management system.

Key areas tested include:

Instance generation through Spring context
Lifecycle management (start/stop operations)
Spring configuration loading and validation
Instance destination property handling

Implementation Analysis

The testing approach utilizes Spring’s ClassPathXmlApplicationContext for dependency injection and component management.

Key implementation patterns include:

Before/After test lifecycle hooks for setup and cleanup
Spring context configuration through XML
System property configuration for instance destination
Explicit instance lifecycle management

Technical Details

Testing infrastructure includes:

JUnit 4 framework
Spring TestContext framework
ClassPathXmlApplicationContext for bean management
Memory-based instance configuration
Canal Instance Generator integration

Best Practices Demonstrated

The test suite exemplifies several testing best practices in Spring-based applications.

Notable practices include:

Proper resource cleanup in @After methods
Isolation of test context through system property configuration
Explicit verification of component initialization
Controlled instance lifecycle management
Clear separation of setup, execution, and teardown phases

alibaba/canal

instance/spring/src/test/java/com/alibaba/otter/canal/instance/spring/integrated/MemorySpringInstanceTest.java

            
package com.alibaba.otter.canal.instance.spring.integrated;

import org.junit.After;
import org.junit.Before;
import org.junit.Ignore;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.AbstractApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.util.Assert;

import com.alibaba.otter.canal.instance.core.CanalInstance;
import com.alibaba.otter.canal.instance.core.CanalInstanceGenerator;

/**
 * @author zebin.xuzb @ 2012-7-13
 * @version 1.0.0
 */
@Ignore
public class MemorySpringInstanceTest {

    private ApplicationContext context;

    @Before
    public void start() {
        System.setProperty("canal.instance.destination", "retl");
        context = new ClassPathXmlApplicationContext(new String[] { "classpath:spring/memory-instance.xml" });
    }

    @After
    public void close() {
        if (context != null && context instanceof AbstractApplicationContext) {
            ((AbstractApplicationContext) context).close();
        }
    }

    @Test
    public void testInstance() {
        CanalInstanceGenerator generator = (CanalInstanceGenerator) context.getBean("canalInstanceGenerator");
        CanalInstance canalInstance = generator.generate("instance");
        Assert.notNull(canalInstance);

        canalInstance.start();
        try {
            Thread.sleep(10 * 1000);
        } catch (InterruptedException e) {
        }
        canalInstance.stop();
    }
}