appllo源码，摘取其中的工具，含部分guava工具

检查入参不为空

Preconditions.checkNotNull(args,"入参不能为空");

检查List为空

if (CollectionUtils.isEmpty(list))

创建list

List strs = Lists.newArrayList("小明","小强","小红");

创建blockingQueue(guava)

private static final int CLEAN_QUEUE_MAX_SIZE = 100;
private BlockingQueue toClean = Queues.newLinkedBlockingQueue(CLEAN_QUEUE_MAX_SIZE);

Strings判断是否为空 (guava)

Strings.isNullOrEmpty(value)

定时任务线程池

ScheduledExecutorService
        executorService =
        Executors.newScheduledThreadPool(1, ApolloThreadFactory.create("ConfigRefresher", true));

获取spring的全部配置

@Autowired
private ConfigurableEnvironment environment;

跟据入参复制对应的属性

public static void copyEntityProperties(Object source, Object target) {
  org.springframework.beans.BeanUtils.copyProperties(source, target, COPY_IGNORED_PROPERTIES);
}

private static final String[] COPY_IGNORED_PROPERTIES = {"id", "dataChangeCreatedBy", "dataChangeCreatedTime", "dataChangeLastModifiedTime"};

MoreObjects.toStringHelper

public static void main(String[] args) {
        Student st = new Student("小明",2);
        String s = MoreObjects.toStringHelper(st)
                .add("name", st.getName())
                .add("age", st.getAge())
                .toString();
        System.out.println(s);
    }
输出：
Student{name=小明, age=2}

@PostConstruct

//被@PostConstruct修饰的方法会在构造函数之后，init()方法之前运行。
@PostConstruct
private void initialize() {
  cleanExecutorService.submit(() -> {
    while (!cleanStopped.get() && !Thread.currentThread().isInterrupted()) {
      try {
        Long rm = toClean.poll(1, TimeUnit.SECONDS);
        if (rm != null) {
          cleanMessage(rm);
        } else {
          TimeUnit.SECONDS.sleep(5);
        }
      } catch (Throwable ex) {
        Tracer.logError(ex);
      }
    }
  });
}

spring提供的rest操作工具类 RestTemplate

ResponseEntity>> response =
        restTemplate.exchange(portalConfig.userServiceUrl(), HttpMethod.POST, entity, responseType);

原子对象引用

private AtomicReference> m_configServices;

限流算法

RateLimiter m_warnLogRateLimiter　＝　m_warnLogRateLimiter = RateLimiter.create(0.017);

Google依赖注入框架

Injector m_injector = m_injector = Guice.createInjector(new ApolloModule())

UrlEscapers 处理url特殊字符

public static void main(String[] args) {
        String str="http://www.baidu.com/api/?action=s2s_install&a={appsunion}&b=3&c=300294cf2fb33ab47691cde6fed03836";
        str = UrlEscapers.urlFragmentEscaper().escape(str);
        System.out.println("*********" + str);
    }