Project Lombok - @Synchronized Annotation Example

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As you probably know, to avoid multiple threads using a method at the same time, we can declare the method using the synchronized keyword in Java programs.
In this example, we will see how to use @Synchronized annotation to make Java methods synchronized.

Project Lombok Maven

1. Create a simple maven project using - How to Create a Simple Maven Project in Eclipse article.
2. Add the below dependency in your maven project pom.xml file:

<!-- https://mvnrepository.com/artifact/org.projectlombok/lombok -->
<dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
    <version>1.18.4</version>
    <scope>provided</scope>
</dependency>

Adding the Lombok Plugin in IDE (Eclipse)

Follow below steps to install Lombok in eclipse for Windows:

• Downloaded jar from https://projectlombok.org/download or use the jar which is downloaded from your maven build.
• Execute command in terminal: java -jar lombok.jar
• This command will open window as shown in the picture below, install and quit the installer and restart eclipse.
  

With Lombok

import lombok.Synchronized;

public class SynchronizedExample {
    private final Object readLock = new Object();

    @Synchronized
    public static void hello() {
        System.out.println("world");
    }

    @Synchronized
    public int answerToLife() {
        return 42;
    }

    @Synchronized("readLock")
    public void foo() {
        System.out.println("bar");
    }
}

Without Lombok

public class SynchronizedExample {
    private static final Object $LOCK = new Object[0];
    private final Object $lock = new Object[0];
    private final Object readLock = new Object();

    public static void hello() {
        synchronized($LOCK) {
            System.out.println("world");
        }
    }

    public int answerToLife() {
        synchronized($lock) {
            return 42;
        }
    }

    public void foo() {
        synchronized(readLock) {
            System.out.println("bar");
        }
    }
}

Reference

• https://projectlombok.org/features/Synchronized

GitHub Repository

You can view the source code of this article on my GitHub repository at https://github.com/RameshMF/project-lombok-tutorial

Related Project Lombok Articles

1. Project Lombok - @NonNull Annotation Example

2. Project Lombok - Getter, Setter and Constructor Example 

3. Project Lombok - toString(), equals() and hashCode() Method Example

4. Project Lombok - @Data Annotation Example
5. Project Lombok - Builder Pattern using @Builder Annotation

6. Project Lombok - Logging @Slf4j Annotation Example
7. Project Lombok - Automatic Resource Management using @Cleanup

8. Project Lombok - @Synchronized Annotation Example 

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