mybatis中使用到的设计模式_构造者模式

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目录

概 述

构造者模式：

// 该类就是构造者
public class CacheBuilder {
  // 这几个属性就是为生成产品对象需要的字段 
  private String id;
  private Class<? extends Cache> implementation;
  private List<Class<? extends Cache>> decorators;
  private Integer size;
  private Long clearInterval;
  private boolean readWrite;
  private Properties properties;

  public CacheBuilder(String id) {
    this.id = id;
    this.decorators = new ArrayList<Class<? extends Cache>>();
  }
  // 以下这几个方法就是构造者在生成产品对象时，需要使用到的几个具体模块方法。可以根据这几个方法的不同组合，生成不同的Cache对象
  public CacheBuilder implementation(Class<? extends Cache> implementation) {
    this.implementation = implementation;
    return this;
  }

  public CacheBuilder addDecorator(Class<? extends Cache> decorator) {
    if (decorator != null) {
      this.decorators.add(decorator);
    }
    return this;
  }

  public CacheBuilder size(Integer size) {
    this.size = size;
    return this;
  }

  public CacheBuilder clearInterval(Long clearInterval) {
    this.clearInterval = clearInterval;
    return this;
  }

  public CacheBuilder readWrite(boolean readWrite) {
    this.readWrite = readWrite;
    return this;
  }

  public CacheBuilder properties(Properties properties) {
    this.properties = properties;
    return this;
  }
  // 这个方法就是构造者生成产品的具体方法 返回的Cahce对象就是产品角色
  public Cache build() {
    setDefaultImplementations();
    Cache cache = newBaseCacheInstance(implementation, id);
    setCacheProperties(cache);
    if (PerpetualCache.class.equals(cache.getClass())) { // issue #352, do not apply decorators to custom caches
      for (Class<? extends Cache> decorator : decorators) {
        cache = newCacheDecoratorInstance(decorator, cache);
        setCacheProperties(cache);
      }
      cache = setStandardDecorators(cache);
    }
    return cache;
  }
}

总结：

相关工具如下：

分析：

小结：

主要讲述了接下来构造者模式应用，请大家指正~

参考资料和推荐阅读

1.链接: 参考资料.