Guice を使用した Java キャッシュ テクノロジの実装

<dependency>
    <groupId>com.google.inject.extensions</groupId>
    <artifactId>guice-assistedinject</artifactId>
    <version>4.2.2</version>
</dependency>

<dependency>
    <groupId>com.google.inject.extensions</groupId>
    <artifactId>guice-grapher</artifactId>
    <version>4.2.2</version>
</dependency>

<dependency>
    <groupId>com.google.inject.extensions</groupId>
    <artifactId>guice-multibindings</artifactId>
    <version>4.2.2</version>
</dependency>

<dependency>
    <groupId>com.google.inject.extensions</groupId>
    <artifactId>guice-servlet</artifactId>
    <version>4.2.2</version>
</dependency>

<dependency>
    <groupId>com.google.inject.extensions</groupId>
    <artifactId>guice</artifactId>
    <version>4.2.2</version>
</dependency>

<dependency>
    <groupId>com.google.guava</groupId>
    <artifactId>guava</artifactId>
    <version>27.1-jre</version>
</dependency>

import com.google.common.cache.CacheBuilder;
import com.google.inject.AbstractModule;
import com.google.inject.Provides;
import com.google.inject.Singleton;
import com.google.inject.name.Names;
import java.util.concurrent.TimeUnit;

public class CacheLoaderModule extends AbstractModule {

  @Override
  protected void configure() {
    bindConstant().annotatedWith(Names.named("cache.maximumSize")).to(1000);
    bindConstant().annotatedWith(Names.named("cache.expireAfterWrite")).to(10);
  }

  @Provides
  @Singleton
  CacheLoader<String, Object> getCacheLoader() {
    CacheBuilder<Object, Object> cacheBuilder =
        CacheBuilder.newBuilder()
            .maximumSize(1000)
            .expireAfterWrite(10, TimeUnit.MINUTES);

    return new CacheLoader<String, Object>() {
      @Override
      public Object load(String key) throws Exception {
        return null;
      }
    };
  }
}

import com.google.inject.Guice;
import com.google.inject.Injector;
import com.google.inject.Key;
import com.google.inject.name.Names;
import java.util.concurrent.ExecutionException;
import org.apache.commons.lang3.RandomStringUtils;

public class Main {
  public static void main(String[] args) throws ExecutionException {
    Injector injector = Guice.createInjector(new CacheLoaderModule());

    Cache<String, Object> cache = injector.getInstance(Key.get(new TypeLiteral<Cache<String, Object>>() {}));

    String key = RandomStringUtils.randomAlphanumeric(10);

    Object value = cache.get(key, () -> {
      return new Object();
    });

    System.out.println("Key: " + key);
    System.out.println("Value: " + value);
  }
}