Scala Semaphore类代码示例

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本文整理汇总了Scala中java.util.concurrent.Semaphore类的典型用法代码示例。如果您正苦于以下问题：Scala Semaphore类的具体用法？Scala Semaphore怎么用？Scala Semaphore使用的例子？那么恭喜您, 这里精选的类代码示例或许可以为您提供帮助。

在下文中一共展示了Semaphore类的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于我们的系统推荐出更棒的Scala代码示例。

示例1: LimitConcurrentRequestsFilter

//设置package包名称以及导入依赖的类
package mesosphere.marathon.api

import java.util.concurrent.Semaphore
import javax.servlet._
import javax.servlet.http.HttpServletResponse


class LimitConcurrentRequestsFilter(concurrentOption: Option[Int]) extends Filter {

  val concurrent = concurrentOption.getOrElse(0)
  val semaphore = new Semaphore(concurrent)
  val filterFunction = concurrentOption.map(_ => withSemaphore _).getOrElse(pass _)

  def withSemaphore(request: ServletRequest, response: ServletResponse, chain: FilterChain): Unit = {
    if (semaphore.tryAcquire()) {
      try { chain.doFilter(request, response) }
      finally { semaphore.release() }
    } else {
      response match {
        case r: HttpServletResponse => r.sendError(503, s"Too many concurrent requests! Allowed: $concurrent.")
        case r: ServletResponse => throw new IllegalArgumentException(s"Expected http response but got $response")
      }
    }
  }

  def pass(request: ServletRequest, response: ServletResponse, chain: FilterChain): Unit = {
    chain.doFilter(request, response)
  }

  override def doFilter(request: ServletRequest, response: ServletResponse, chain: FilterChain): Unit = {
    filterFunction(request, response, chain)
  }

  override def init(filterConfig: FilterConfig): Unit = {}
  override def destroy(): Unit = {}
}

开发者ID:xiaozai512，项目名称:marathon，代码行数:37，代码来源:LimitConcurrentRequestsFilter.scala

注：本文中的java.util.concurrent.Semaphore类示例整理自Github/MSDocs等源码及文档管理平台，相关代码片段筛选自各路编程大神贡献的开源项目，源码版权归原作者所有，传播和使用请参考对应项目的License；未经允许，请勿转载。