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Testing Request Collapsing Implementation in Netflix Hystrix

This test suite validates Hystrix’s Request Collapsing functionality within a Spring framework context. The tests ensure proper request batching and collapsing behavior for optimizing multiple concurrent requests in Netflix’s fault tolerance library.

Test Coverage Overview

The test suite focuses on request collapsing capabilities in Hystrix, covering batch request handling and optimization.

Key areas tested include:

Spring-managed request collapsing
User service request batching
Integration with Spring’s dependency injection
CGLIB-based AOP configuration

Implementation Analysis

The implementation leverages Spring’s testing framework with JUnit4 integration. The test extends BasicCollapserTest while incorporating Spring-specific configurations through @ContextConfiguration and @RunWith annotations.

Notable patterns include:

Spring bean configuration for UserService
AOP-based request collapsing setup
Autowired dependency management

Technical Details

Testing infrastructure includes:

SpringJUnit4ClassRunner for test execution
Spring Context Configuration with AopCglibConfig
Autowired UserService injection
Configurable test configuration class
Integration with Hystrix’s collapser functionality

Best Practices Demonstrated

The test exemplifies several testing best practices for Spring-based Hystrix applications.

Notable practices include:

Clean separation of configuration and test logic
Proper use of Spring testing annotations
Inheritance-based test organization
Clear configuration management through dedicated config classes

netflix/hystrix

hystrix-contrib/hystrix-javanica/src/test/java/com/netflix/hystrix/contrib/javanica/test/spring/collapser/CollapserTest.java

            
/**
 * Copyright 2015 Netflix, Inc.
 * <p/>
 * 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
 * <p/>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p/>
 * 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 com.netflix.hystrix.contrib.javanica.test.spring.collapser;

import com.netflix.hystrix.contrib.javanica.test.common.collapser.BasicCollapserTest;
import com.netflix.hystrix.contrib.javanica.test.spring.conf.AopCglibConfig;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Configurable;
import org.springframework.context.annotation.Bean;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

/**
 * This test covers "Request Collapsing" functionality.
 * <p/>
 * https://github.com/Netflix/Hystrix/wiki/How-To-Use#Collapsing
 */
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = {AopCglibConfig.class, CollapserTest.CollapserTestConfig.class})
public class CollapserTest extends BasicCollapserTest {

    @Autowired
    private BasicCollapserTest.UserService userService;

    @Override
    protected UserService createUserService() {
        return userService;
    }


    /**
     * Spring configuration.
     */
    @Configurable
    public static class CollapserTestConfig {

        @Bean
        public UserService userService() {
            return new UserService();
        }
    }

}