How to use Java to develop a distributed cache application based on Hazelcast

How to use Java to develop a distributed cache application based on Hazelcast

1. What is Hazelcast distributed cache?

Hazelcast is an open source distributed computing platform and a highly scalable in-memory data grid. It provides distributed cache, distributed data structure and distributed computing functions, which can help us build distributed high-performance applications. In this article, we will develop a distributed cache application based on Hazelcast using Java.

2. Environment setup

Before we start, we need to set up the development environment first. First, we need to download the Hazelcast jar package and import it into our project. You can download the latest version of the jar package from the official website of Hazelcast. Secondly, we need a Java compiler and development environment, such as Eclipse or IntelliJ IDEA.

3. Create a Hazelcast instance

In our code, we need to create a Hazelcast instance. First, we need to add the following dependencies to our pom.xml file:

<dependency>
    <groupId>com.hazelcast</groupId>
    <artifactId>hazelcast</artifactId>
    <version>4.2.1</version>
</dependency>

Then, we can create a Hazelcast instance according to the following code:

import com.hazelcast.core.Hazelcast;
import com.hazelcast.core.HazelcastInstance;

public class HazelcastCache {

    public static void main(String[] args) {
        // 创建一个Hazelcast实例
        HazelcastInstance hazelcastInstance = Hazelcast.newHazelcastInstance();
    }
}

4. Add data to the cache

Now that we have created a Hazelcast instance, we need to add some data to the cache. The following is a simple example:

import com.hazelcast.core.Hazelcast;
import com.hazelcast.core.HazelcastInstance;
import com.hazelcast.core.IMap;

public class HazelcastCache {

    public static void main(String[] args) {
        // 创建一个Hazelcast实例
        HazelcastInstance hazelcastInstance = Hazelcast.newHazelcastInstance();

        // 获取一个IMap实例
        IMap<String, String> cache = hazelcastInstance.getMap("cache");

        // 向缓存中添加数据
        cache.put("key1", "value1");
        cache.put("key2", "value2");
        cache.put("key3", "value3");
    }
}

5. Get data from the cache

Now that we have added some data to the cache, next we need to get the data from the cache. The following is a simple example:

import com.hazelcast.core.Hazelcast;
import com.hazelcast.core.HazelcastInstance;
import com.hazelcast.core.IMap;

public class HazelcastCache {

    public static void main(String[] args) {
        // 创建一个Hazelcast实例
        HazelcastInstance hazelcastInstance = Hazelcast.newHazelcastInstance();

        // 获取一个IMap实例
        IMap<String, String> cache = hazelcastInstance.getMap("cache");

        // 从缓存中获取数据
        String value1 = cache.get("key1");
        String value2 = cache.get("key2");
        String value3 = cache.get("key3");

        System.out.println("value1: " + value1);
        System.out.println("value2: " + value2);
        System.out.println("value3: " + value3);
    }
}

6. Run the application

Now that we have completed writing the code, we need to run our application. You can start the application by running the HazelcastCache.java file.

When the application is running, you should be able to see the following output on the console:

value1: value1
value2: value2
value3: value3

This proves that we have successfully obtained the data from the cache.

7. Summary

This article introduces how to use Java to develop a distributed cache application based on Hazelcast. First, we set up the development environment and then created a Hazelcast instance. Next, we added some data to the cache and retrieved the data from the cache. After studying this article, you should already know how to use Hazelcast to build distributed caching applications.

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