Introduction
Adobe Experience Manager (AEM) Developer Mode offers indispensable tools and functionalities that empower developers to streamline their workflow, debug efficiently, and enhance productivity. In this comprehensive guide, we explore the various features and benefits of Developer Mode, delve into effective unit testing practices using popular frameworks, and demonstrate how to implement custom health checks using OSGi services. Whether you’re new to AEM development or looking to optimize your existing processes, this guide will equip you with practical insights and actionable steps.
The Need for Developer Mode
In the realm of AEM development, identifying errors swiftly and navigating through complex node structures are fundamental tasks. However, traditional approaches often involve cumbersome steps that hinder productivity. Developer Mode addresses these challenges by providing a user-friendly interface packed with powerful debugging tools and utilities.
Advantages of Developer Mode
Developer Mode in AEM offers several key advantages from both developer and author perspectives:
Developer Perspective:
- Effortless Error Detection: Quickly pinpoint errors in SLING models and other components directly within the AEM interface. The error section of Developer Mode displays comprehensive stack traces, facilitating rapid troubleshooting without leaving the current page.
- Point-and-Click Node Navigation: Seamlessly navigate to component nodes, scripts, and other resources within CRX. Hyperlinks in Developer Mode streamline the exploration process, enhancing developer efficiency.
- Component Policies and Details: Instantly review applied policies, component details, and documentation links with a single click. This feature aids in understanding component configurations and usage across the AEM instance.
Author Perspective:
- Live Usage and Component Reports: Authors benefit from insights into where specific components are utilized across the AEM platform. This visibility enhances content management and governance.
- Component Documentation and Authoring Guide: Access component-specific documentation directly within Developer Mode. Customizable authoring guides improve author experience by providing clear instructions and best practices.
Unit Testing in AEM
With the evolution of AEM as a Cloud Service (AEMaaCS), incorporating robust unit testing practices is crucial for maintaining code quality and ensuring compatibility with cloud-native environments. Let’s explore the usage of four prominent testing frameworks:
JUnit 5:
JUnit remains the standard framework for writing unit tests in Java applications. It supports assertions and test case organization, making it ideal for testing non-AEM specific code and business logic.
Mockito:
Mockito excels in mocking external dependencies such as services and databases. It facilitates behavior verification and interaction testing, ensuring isolated and reliable unit tests.
Apache Sling Mocks:
Apache Sling Mocks simulate the AEM environment, including Sling-specific functionality and resource handling. This framework is invaluable for testing AEM components and services within a controlled environment.
AEM Mocks:
Tailored for AEM-specific testing, AEM Mocks provide extensive support for Sling models and simulate AEM behaviors effectively. It integrates well with AEM development workflows and is suitable for comprehensive integration tests.
java
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@ExtendWith({MockitoExtension.class, AemContextExtension.class})
class MyComponentTest {
private final AemContext context = new AemContext();
@Mock
private ExternalDataService externalDataService;
@BeforeEach
void setUp() {
// Set up AEM context with necessary resources and sling models
context.create().resource(“/content/my-site”);
context.addModelsForClasses(MyContentModel.class);
context.registerService(ExternalDataService.class, externalDataService);
}
@Test
void testMyComponentWithData() {
// Mock behavior of the external service
when(externalDataService.getData(“/content/my-site”)).thenReturn(“Mocked Data”);
// Create an instance of your component
MyComponent component = context.request().adaptTo(MyComponent.class);
// Test component logic when data is available
String result = component.renderContent();
// Verify interactions and assertions
verify(externalDataService).getData(“/content/my-site”);
assertEquals(“Expected Result: Mocked Data”, result);
}
@Test
void testMyComponentWithoutData() {
// Mock behavior of the external service when data is not available
when(externalDataService.getData(“/content/my-site”)).thenReturn(null);
// Create an instance of your component
MyComponent component = context.request().adaptTo(MyComponent.class);
// Test component logic when data is not available
String result = component.renderContent();
// Verify interactions and assertions
verify(externalDataService).getData(“/content/my-site”);
assertEquals(“Fallback Result: No Data Available”, result);
}
}
Keyboard Shortcuts for AEM Efficiency
Mastering keyboard shortcuts in AEM enhances productivity by minimizing navigation time and optimizing workflow. Here’s a handy shortcut to toggle between Preview and selected modes:
- Ctrl-Shift-m: Toggle between Preview and the selected mode in any edit window.
Implementing Custom Health Checks with OSGi Services
Monitoring the health and performance of an AEM application is critical for ensuring reliability and stability. Implementing custom health checks using OSGi services provides tailored insights into specific aspects of your AEM instance. Let’s illustrate this with an example health check for disk space usage:
java
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package com.example.aem.healthchecks;
import org.apache.felix.hc.api.HealthCheck;
import org.apache.felix.hc.api.Result;
import org.apache.felix.hc.api.ResultLog;
import org.apache.sling.api.resource.ResourceResolver;
import org.osgi.service.component.annotations.Component;
import org.osgi.service.component.annotations.Reference;
import java.io.File;
import java.util.Arrays;
import java.util.List;
@Component(service = HealthCheck.class,
property = {
HealthCheck.NAME + “=Disk Space Check”,
HealthCheck.TAGS + “=example”,
HealthCheck.MBEAN_NAME + “=DiskSpaceCheck”,
HealthCheck.MBEAN_DESCRIPTION + “=Checks the disk space usage at specified paths”
})
public class DiskSpaceCheck implements HealthCheck {
@Override
public Result execute() {
ResultLog resultLog = new ResultLog();
List<String> pathsToCheck = Arrays.asList(“/content”, “/apps”);
for (String path : pathsToCheck) {
File file = new File(path);
long freeSpace = file.getFreeSpace();
long totalSpace = file.getTotalSpace();
double usedPercentage = ((double) (totalSpace – freeSpace) / totalSpace) * 100;
if (usedPercentage >= 90) {
resultLog.critical(“Disk space usage at ” + path + ” is critical: ” + usedPercentage + “%”);
} else if (usedPercentage >= 80) {
resultLog.warn(“Disk space usage at ” + path + ” is warning: ” + usedPercentage + “%”);
} else {
resultLog.info(“Disk space usage at ” + path + ” is normal: ” + usedPercentage + “%”);
}
}
return new Result(resultLog);
}
}
Conclusion
Embracing AEM Developer Mode, adopting effective unit testing strategies, and implementing custom health checks are integral to maximizing the potential of Adobe Experience Manager. By leveraging these tools and techniques, developers and teams can enhance code quality, streamline development workflows, and ensure robust performance in both development and production environments. Stay tuned for more insights into mastering AEM and optimizing your digital experiences.
In conclusion, mastering AEM Developer Mode, implementing robust unit tests, and deploying custom health checks are crucial steps towards optimizing Adobe Experience Manager for enhanced performance and reliability. By integrating these practices into your development workflow, you can ensure smoother deployments, faster debugging, and more resilient applications. Stay tuned for more in-depth insights and best practices to elevate your AEM development skills and efficiency.
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