Question

我正在尝试在scala中转换此代码http://uadetector.sourceforge.net/usage.html#improve_performance，但却变得非常糟糕

object CachedUserAgentStringParser extends UserAgentStringParser {
  private val parser = UADetectorServiceFactory.getCachingAndUpdatingParser

  private val cache = CacheBuilder.newBuilder().maximumSize(100).expireAfterWrite(2, TimeUnit.HOURS)
    .build()


  override def getDataVersion(): String = parser.getDataVersion



  override def parse(userAgentString: String): ReadableUserAgent = {
    var result = cache.getIfPresent(userAgentString)
    if (result == null) {
      result = parser.parse(userAgentString)
      cache.put(userAgentString, result)
    }
    result
  }

  override def shutdown() {
    parser.shutdown()
  }

}

获取错误类型

 mismatch; found : net.sf.uadetector.ReadableUserAgent required: Nothing

  result = parser.parse(userAgentString)
                        ^
  cache.put(userAgentString, result)
            ^

Answer 1

您需要为cache变量指定类型参数。

private val cache: Cache[String, ReadableUserAgent] =
  CacheBuilder.newBuilder().maximumSize(100).expireAfterWrite(2, TimeUnit.HOURS).build()

以下是一个可编辑的示例：https://gist.github.com/tkawachi/2b68ca16d1b317c1d1dd

不匹配;发现：net.sf.uadetector.ReadableUserAgent必需：没什么

1 个答案: