https://quoters.apps.pcfone.io

GET /api         - get all quotes
GET /api/random  - get random quote
GET /api/{id}    - get specific quote

package hello;

import com.fasterxml.jackson.annotation.JsonIgnoreProperties;

import org.springframework.util.ObjectUtils;

import lombok.Data;

@Data
@JsonIgnoreProperties(ignoreUnknown = true)
@SuppressWarnings("unused")
public class Quote {

  private Long id;

  private String quote;

  @Override
  public boolean equals(Object obj) {

    if (this == obj) {
      return true;
    }

    if (!(obj instanceof Quote)) {
      return false;
    }

    Quote that = (Quote) obj;

    return ObjectUtils.nullSafeEquals(this.getId(), that.getId());
  }

  @Override
  public int hashCode() {

    int hashValue = 17;

    hashValue = 37 * hashValue + ObjectUtils.nullSafeHashCode(getId());

    return hashValue;
  }

  @Override
  public String toString() {
    return getQuote();
  }
}

package hello;

import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import com.fasterxml.jackson.annotation.JsonProperty;

import lombok.Data;

@Data
@JsonIgnoreProperties(ignoreUnknown = true)
public class QuoteResponse {

  @JsonProperty("value")
  private Quote quote;

  @JsonProperty("type")
  private String status;

  @Override
  public String toString() {
    return String.format("{ @type = %1$s, quote = '%2$s', status = %3$s }",
      getClass().getName(), getQuote(), getStatus());
  }
}

{
  "type":"success",
  "value": {
    "id":1,
    "quote":"Working with Spring Boot is like pair-programming with the Spring developers."
  }
}

package hello;

import java.util.Collections;
import java.util.Map;
import java.util.Optional;

import org.springframework.cache.annotation.CachePut;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.stereotype.Service;
import org.springframework.web.client.RestTemplate;

@SuppressWarnings("unused")
@Service
public class QuoteService {

  protected static final String ID_BASED_QUOTE_SERVICE_URL = "https://quoters.apps.pcfone.io/api/{id}";
  protected static final String RANDOM_QUOTE_SERVICE_URL = "https://quoters.apps.pcfone.io/api/random";

  private volatile boolean cacheMiss = false;

  private final RestTemplate quoteServiceTemplate = new RestTemplate();

  /**
   * Determines whether the previous service method invocation resulted in a cache miss.
   *
   * @return a boolean value indicating whether the previous service method invocation resulted in a cache miss.
   */
  public boolean isCacheMiss() {
    boolean cacheMiss = this.cacheMiss;
    this.cacheMiss = false;
    return cacheMiss;
  }

  protected void setCacheMiss() {
    this.cacheMiss = true;
  }

  /**
   * Requests a quote with the given identifier.
   *
   * @param id the identifier of the {@link Quote} to request.
   * @return a {@link Quote} with the given ID.
   */
  @Cacheable("Quotes")
  public Quote requestQuote(Long id) {
    setCacheMiss();
    return requestQuote(ID_BASED_QUOTE_SERVICE_URL, Collections.singletonMap("id", id));
  }

  /**
   * Requests a random quote.
   *
   * @return a random {@link Quote}.
   */
  @CachePut(cacheNames = "Quotes", key = "#result.id")
  public Quote requestRandomQuote() {
    setCacheMiss();
    return requestQuote(RANDOM_QUOTE_SERVICE_URL);
  }

  protected Quote requestQuote(String URL) {
    return requestQuote(URL, Collections.emptyMap());
  }

  protected Quote requestQuote(String URL, Map<String, Object> urlVariables) {

    return Optional.ofNullable(this.quoteServiceTemplate.getForObject(URL, QuoteResponse.class, urlVariables))
      .map(QuoteResponse::getQuote)
      .orElse(null);
  }
}

package hello;

import java.util.Optional;

import org.apache.geode.cache.client.ClientRegionShortcut;

import org.springframework.boot.ApplicationRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.data.gemfire.cache.config.EnableGemfireCaching;
import org.springframework.data.gemfire.config.annotation.ClientCacheApplication;
import org.springframework.data.gemfire.config.annotation.EnableCachingDefinedRegions;

@SpringBootApplication
@ClientCacheApplication(name = "CachingGemFireApplication")
@EnableCachingDefinedRegions(clientRegionShortcut = ClientRegionShortcut.LOCAL)
@EnableGemfireCaching
@SuppressWarnings("unused")
public class Application {

  public static void main(String[] args) {
    SpringApplication.run(Application.class, args);
  }

  @Bean
  ApplicationRunner runner(QuoteService quoteService) {

    return args -> {
      Quote quote = requestQuote(quoteService, 12L);
      requestQuote(quoteService, quote.getId());
      requestQuote(quoteService, 10L);
    };
  }

  private Quote requestQuote(QuoteService quoteService, Long id) {

    long startTime = System.currentTimeMillis();

    Quote quote = Optional.ofNullable(id)
      .map(quoteService::requestQuote)
      .orElseGet(quoteService::requestRandomQuote);

    long elapsedTime = System.currentTimeMillis();

    System.out.printf("\"%1$s\"%nCache Miss [%2$s] - Elapsed Time [%3$s ms]%n", quote,
      quoteService.isCacheMiss(), (elapsedTime - startTime));

    return quote;
  }
}

你可以通过 Gradle 或 Maven 从命令行运行应用程序。你也可以构建一个包含所有必需依赖项、类和资源的单个可执行 JAR 文件并运行它。这样可以轻松地在整个开发生命周期中，在不同的环境中打包、版本控制和部署服务。

如果你使用 Gradle，可以通过运行 ./gradlew bootRun 来启动应用程序。或者，你也可以通过运行 ./gradlew build 构建 JAR 文件，并按如下方式运行该 JAR 文件：

如果你使用 Maven，可以通过运行 ./mvnw spring-boot:run 来启动应用。或者，你可以通过执行 ./mvnw clean package 构建 JAR 文件，然后按照以下方式运行该 JAR 文件：

显示日志输出，服务将在几秒钟内启动并开始运行。

从这里可以看出，第一次调用报价服务获取报价耗时776毫秒，导致缓存未命中。然而，第二次请求相同报价的调用仅耗时0毫秒，并且缓存命中。这清楚地表明第二次调用被缓存了，并没有实际访问报价服务。但是，当最终为一个特定的、未缓存的报价请求进行服务调用时，它耗时96毫秒，并且由于这个新报价在调用之前不在缓存中而导致缓存未命中。