com.hazelcast.config.MaxSizeConfig 的导入问题

Question

我正在编写 Spring boot 教程，但我对视频的这一部分有点困惑。视频中的旁白在 return 语句中使用 MaxSizeConfig 导入。尝试同一行，我收到一条错误，指出 MaxSizeConfig 无法解析为类型。查看 hazelcast 的文档，导入存在。我可以得到一些关于我的代码做错的地方的指示吗？

这是我的 pom.xml：

<?xml version="1.0" encoding="UTF-8"?>
 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.5.3</version>
    <relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.stephen.springweb</groupId>
<artifactId>productrestapi</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>productrestapi</name>
<description>Demo project for Spring Boot</description>
<properties>
    <java.version>8</java.version>
</properties>
<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-actuator</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-security</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
        <exclusions>
            <exclusion>
                <groupId>
                    org.springframework.boot
                </groupId>
                <artifactId>
                    spring-boot-starter-tomcat
                </artifactId>
            </exclusion>
        </exclusions>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-cache</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-jetty</artifactId>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <scope>runtime</scope>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>com.hazelcast</groupId>
        <artifactId>hazelcast</artifactId>
    </dependency>
    <dependency>
        <groupId>com.hazelcast</groupId>
        <artifactId>hazelcast-spring</artifactId>
    </dependency>
</dependencies>

<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
            <executions>
                <execution>
                    <goals>
                        <goal>build-info</goal>
                    </goals>
                </execution>
            </executions>
        </plugin>
    </plugins>
</build>

这是尝试使用 MaxSizeConfig 的代码：

package com.stephen.springweb.productrestapi.config;

import org.springframework.context.annotation.Bean;
import com.hazelcast.config.Config;
import com.hazelcast.config.EvictionPolicy;
import com.hazelcast.config.MapConfig;
import com.hazelcast.config.MaxSizePolicy;

import org.springframework.context.annotation.Configuration;

@Configuration
public class ProductCacheConfig {

    @Bean
    public Config cacheConfig() {
        return new Config()
                    .setInstanceName("hazel-instance")
                    .addMapConfig(new MapConfig()
                        .setName("product-cache")
                        .setTimeToLiveSeconds(3000)
                        .setMaxSizeConfig(new MaxSizeConfig(200, MaxSizePolicy.FREE_HEAP_SIZE))
                        .setEvictionPolicy(EvictionPolicy.LRU)
                    );
    }
}

谢谢。

Answer 1

对于版本 4，请使用 setEvictionConfig。 https://docs.hazelcast.org/docs/4.0/javadoc/com/hazelcast/config/EvictionConfig.html

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import com.hazelcast.config.Config;
import com.hazelcast.config.EvictionConfig;
import com.hazelcast.config.EvictionPolicy;
import com.hazelcast.config.MapConfig;
import com.hazelcast.config.MaxSizePolicy;

@Configuration
public class ProductCacheConfig {

    @Bean
    public Config cacheConfig() {
        return new Config()
                .setInstanceName("hazel-instance")
                .addMapConfig(new MapConfig()
                        .setName("product-cache")
                        .setTimeToLiveSeconds(3000)
                        .setEvictionConfig(new EvictionConfig()
                                .setSize(200)
                                .setMaxSizePolicy(MaxSizePolicy.FREE_HEAP_SIZE)
                                .setEvictionPolicy(EvictionPolicy.LRU)
                        )
                );
    }

}