Scala AtomicBoolean类代码示例

//设置package包名称以及导入依赖的类
package lazytx.benchmark.oltp

import java.util.concurrent.atomic.AtomicBoolean

object Benchmark {
  def benchmark(threads : Int, millis : Long, tx : () => Unit) : Double = {
    var start = time
    
    val running = new AtomicBoolean(false)
    val stopping = new AtomicBoolean(false)
    
    val ts = Array.ofDim[BenchmarkThread](threads)
    for(i <- 0 to threads - 1)
      ts(i) = new BenchmarkThread(running, stopping, tx)
    
    ts.foreach(_.start())
    
    val begin = time()
    running.set(true)
    Thread.sleep(millis)
    stopping.set(true)
    val end = time()
    
    ts.foreach(_.join())
    
    return ts.map(_.count).sum / (end - begin)
  }
  
  def time() = System.nanoTime() / 1000000000.0
}

class BenchmarkThread(running : AtomicBoolean, stopping : AtomicBoolean, tx : () => Unit) extends Thread {
  var count = 0L
  
  override def run() {
    var count = 0L
    
    while(!running.get()) {
      // wait to start
    }
    
    while(!stopping.get()) {
      tx()
      if(!stopping.get())  // Dont count transactions that didnt finish on time
        count += 1
    }
    
    this.count = count  
  }
} 

//设置package包名称以及导入依赖的类
package com.github.madoc.create_sbt_project.action.framework

import java.util.concurrent.atomic.AtomicBoolean

import com.github.madoc.create_sbt_project.action.CreateDirectory
import com.github.madoc.create_sbt_project.action.framework.ActionResult.PreconditionFailures
import com.github.madoc.create_sbt_project.action.precondition.PreconditionFailure
import com.github.madoc.create_sbt_project.action.precondition.PreconditionFailure.DirectoryDoesNotExist
import com.github.madoc.create_sbt_project.io.FileSystemSupport
import org.scalatest.{FreeSpec, Matchers}

class ActionListTest extends FreeSpec with Matchers {
  "an ActionList combines the precondition failures that its contents might deal with" in {
    val al = ActionList(CreateDirectory("dir1"), CreateDirectory("dir2"))
    al.mightDealWith(DirectoryDoesNotExist("dir1")) should be (true)
    al.mightDealWith(DirectoryDoesNotExist("dir2")) should be (true)
    al.mightDealWith(DirectoryDoesNotExist("dir3")) should be (false)
  }
  "ActionList() returns the empty action" in {
    ActionList() should be (ActionList empty)
  }
  "an empty ActionList cannot deal with any precondition failure" in {
    ActionList.empty.mightDealWith(DirectoryDoesNotExist("dir")) should be (false)
  }
  "an empty ActionList returns a meaningful toString" in {
    ActionList.empty.toString should be ("ActionList()")
  }
  "a non-empty ActionList returns a meaningful toString" in {
    ActionList(CreateDirectory("foo"), CreateDirectory("bar")).toString should be ("ActionList(CreateDirectory(foo), CreateDirectory(bar))")
  }
  "when an action in the middle of an ActionList fails, the following action is not called" in {
    object NonFailingAction extends Action {
      protected def run(env:ActionEnvironment) = ActionResult.Success
      def precondition = {_:ActionEnvironment ? Seq()}
      def mightDealWith(failure:PreconditionFailure) = false
    }
    class FailingAction extends Action {
      val runCalled = new AtomicBoolean(false)
      protected def run(env:ActionEnvironment) = {
        runCalled set true
        ActionResult.PreconditionFailures(Seq(DirectoryDoesNotExist("dummy")))
      }
      def precondition = {_:ActionEnvironment ? Seq()}
      def mightDealWith(failure:PreconditionFailure) = false
    }
    val (action1, action2, action3) = (NonFailingAction, new FailingAction, new FailingAction)
    ActionList(action1, action2, action3)(FileSystemSupport default) should be (PreconditionFailures(Seq(DirectoryDoesNotExist("dummy"))))
    action2.runCalled.get should be (true)
    action3.runCalled.get should be (false)
  }
} 

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

import java.util.concurrent.atomic.AtomicBoolean

import org.slf4j.LoggerFactory

import scala.util.control.NonFatal

trait ShutdownHooks {
  def onShutdown(block: => Unit): Unit

  def shutdown(): Unit

  def isShuttingDown: Boolean
}

object ShutdownHooks {
  def apply(): ShutdownHooks = new DefaultShutdownHooks
}

private[base] class BaseShutdownHooks extends ShutdownHooks {
  private[this] val log = LoggerFactory.getLogger(getClass)
  private[this] var shutdownHooks = List.empty[() => Unit]
  private[this] val shuttingDown = new AtomicBoolean(false)

  override def onShutdown(block: => Unit): Unit = {
    shutdownHooks +:= { () => block }
  }

  override def shutdown(): Unit = {
    shuttingDown.set(true)
    shutdownHooks.foreach { hook =>
      try hook()
      catch {
        case NonFatal(e) => log.error("while executing shutdown hook", e)
      }
    }
    shutdownHooks = Nil
  }

  override def isShuttingDown: Boolean = shuttingDown.get
}


private class DefaultShutdownHooks extends BaseShutdownHooks {
  Runtime.getRuntime.addShutdownHook(new Thread() {
    override def run(): Unit = {
      shutdown()
    }
  })
} 

//设置package包名称以及导入依赖的类
package io.grhodes.mcm.server.gcm

import java.util.concurrent.atomic.AtomicBoolean
import java.util.concurrent.{DelayQueue, Executors}

import com.gilt.gfc.logging.Loggable

import scala.util.control.NonFatal


class MessageRelayManager(val gcmMessageStore: GCMMessageStore) extends Loggable {

  private val executorService = Executors.newFixedThreadPool(50)
  private val queue = new DelayQueue[ScheduledJob]()
  private val keepRunning = new AtomicBoolean(true)
  private val schedulerFuture = executorService.submit(new JobScheduler(this))

  def shutdown(): Boolean = {
    this.keepRunning.set(false)
    gcmMessageStore.shutdown()
    queue.clear()
    schedulerFuture.cancel(true)
    true
  }

  def addJob(job: ScheduledJob): Boolean = queue.add(job)

  class JobScheduler(relayManager: MessageRelayManager) extends Runnable {
    override def run(): Unit = {
      while (keepRunning.get()) {
        try {
          val scheduledJob = queue.take()
          executorService.execute(new Runnable() {
            override def run(): Unit = scheduledJob.execute(relayManager)
          });
        } catch {
          case NonFatal(e) =>
            error("JobScheduler.run() got exception:", e)
        }
      }
    }
  }

} 

//设置package包名称以及导入依赖的类
package reactify

import java.util.concurrent.atomic.AtomicBoolean

import reactify.bind._

trait StateChannel[T] extends State[T] with Channel[T] {
  override def static(value: T): Unit = super.static(value)

  def bind[V](that: StateChannel[V], setNow: BindSet = BindSet.LeftToRight)
             (implicit t2v: T => V, v2t: V => T): Binding[T, V] = {
    setNow match {
      case BindSet.LeftToRight => that := t2v(this)
      case BindSet.RightToLeft => this := v2t(that)
      case BindSet.None => // Nothing
    }
    val changing = new AtomicBoolean(false)
    val leftToRight = this.attach { t =>
      if (changing.compareAndSet(false, true)) {
        try {
          that := t2v(get)
        } finally {
          changing.set(false)
        }
      }
    }
    val rightToLeft = that.attach { t =>
      if (changing.compareAndSet(false, true)) {
        try {
          StateChannel.this := v2t(that.get)
        } finally {
          changing.set(false)
        }
      }
    }
    new Binding(this, that, leftToRight, rightToLeft)
  }
} 

//设置package包名称以及导入依赖的类
package com.flipkart.connekt.barklice

import java.util.concurrent.atomic.AtomicBoolean

import com.flipkart.connekt.commons.connections.ConnectionProvider
import com.flipkart.connekt.commons.core.BaseApp
import com.flipkart.connekt.commons.dao.DaoFactory
import com.flipkart.connekt.commons.factories.{ConnektLogger, LogFile}
import com.flipkart.connekt.commons.services.ConnektConfig
import com.flipkart.connekt.commons.utils.{NetworkUtils, StringUtils, ConfigUtils}
import flipkart.cp.convert.ha.worker.Bootstrap

object BarkLiceBoot extends BaseApp {

  private val initialized = new AtomicBoolean(false)

  def start() {
    if (!initialized.getAndSet(true)) {
      ConnektLogger(LogFile.SERVICE).info("BarkLiceBoot initializing.")

      val loggerConfigFile = ConfigUtils.getSystemProperty("log4j.configurationFile").getOrElse("log4j2-barklice.xml")

      ConnektLogger(LogFile.SERVICE).info(s"BarkLiceBoot logging using: $loggerConfigFile")
      ConnektLogger.init(loggerConfigFile)

      val applicationConfigFile = ConfigUtils.getSystemProperty("barklice.appConfigurationFile").getOrElse("barklice-config.json")
      ConnektConfig(configServiceHost, configServicePort, apiVersion)(Seq("fk-connekt-root", "fk-connekt-".concat(ConfigUtils.getConfEnvironment), "fk-connekt-barklice"))(applicationConfigFile)

      DaoFactory.setUpConnectionProvider(new ConnectionProvider)

      val hConfig = ConnektConfig.getConfig("connections.hbase")
      DaoFactory.initHTableDaoFactory(hConfig.get)

      val hostname = NetworkUtils.getHostname
      val instanceId = hostname + "-" + StringUtils.generateRandomStr(5)
      ConnektLogger(LogFile.SERVICE).info(s"Starting BarkLice with InstanceId: $instanceId, Hostname : $hostname ...")
      new Bootstrap(instanceId, "", hostname).start()
    }
  }

  def terminate() = {
    ConnektLogger(LogFile.SERVICE).info("BarkLiceBoot shutting down")
    if (initialized.get()) {
      DaoFactory.shutdownHTableDaoFactory()
      ConnektLogger.shutdown()
    }
  }

  def main(args: Array[String]) {
    System.setProperty("log4j.configurationFile", "log4j2-test.xml")
    start()

  }
} 

//设置package包名称以及导入依赖的类
package com.twitter.finagle.service

import com.twitter.finagle.{Status, Service, ServiceClosedException, ServiceProxy, WriteException}
import com.twitter.util.{Future, Time}
import java.util.concurrent.atomic.AtomicBoolean


private[finagle] class CloseOnReleaseService[Req, Rep](underlying: Service[Req, Rep])
  extends ServiceProxy[Req, Rep](underlying)
{
  private[this] val wasReleased = new AtomicBoolean(false)

  override def apply(request: Req) = {
    if (!wasReleased.get) {
      super.apply(request)
    } else {
      Future.exception(
        WriteException(new ServiceClosedException))
    }
  }

  override def close(deadline: Time) = {
    if (wasReleased.compareAndSet(false, true))
      super.close(deadline)
    else
      Future.Done
  }

  override def status = 
    if (wasReleased.get) Status.Closed
    else super.status
} 

//设置package包名称以及导入依赖的类
package indi.lewis.spider.thread

import java.util.concurrent.atomic.AtomicBoolean


    def onException(job :Job[A], e : Exception) :Unit;
  }

  def getJobRunner[B](cores :Int,channel :Runner.JobChannel[B]) :Runner[B] = new Runner[B](cores,channel);
  def getJobRunner[B](channel :Runner.JobChannel[B]) :Runner[B] = getJobRunner(cpuCores*16,channel);

  final lazy val cpuCores:Int = Runtime.getRuntime.availableProcessors()
}

class Runner[C] private (cores :Int,channel : Runner.JobChannel[C]) {

  val ts=new Array[Thread](cores);

  private val started:java.util.concurrent.atomic.AtomicBoolean=new AtomicBoolean(false);

  val endCount=new java.util.concurrent.CountDownLatch(cores);
  val starter=new java.util.concurrent.CountDownLatch(1);

  def startRun() : Unit= {
    startRunAndRet().await()
  }

  def startRunAndRet():java.util.concurrent.CountDownLatch={
    synchronized {
      if (started.get() ) throw new RuntimeException(" Runner has been started ! ");
      started.set(true);
    }

    for( i <- 1 to cores){
      val th=new Thread(){
        override def run(): Unit = {
          starter.await();
          while(channel.nextJob().map( j =>{
            try{
              j.run();
              channel.onJobFinish(j);
            }catch {
              case ex :Exception =>channel.onException(j,ex)
            }
            channel.onJobOver(j)
          })!=None) {}
          endCount.countDown();
        }
      }

      th.setName(s"JobThread( $i /$cores )");
      th.setPriority(Thread.MAX_PRIORITY);
      ts(i-1)=th;
      th.start()
    }
    starter.countDown();

    endCount
  }

} 

//设置package包名称以及导入依赖的类
package org.http4s

import java.util.concurrent.atomic.AtomicBoolean

import com.twitter.util._
import com.twitter.finagle.tracing.Trace
import org.jboss.netty.handler.codec.http.{ DefaultHttpResponse, HttpResponseStatus, HttpVersion => Version }

import scalaz.concurrent.Task
import scalaz.syntax.all._

package object finagle {
  val bufferSize = 65536

  implicit object TwitterFutureMonad extends FutureMonad

  implicit class TwitterFutureToTask[A](val f: Future[A]) extends AnyVal {
    def asTask: Task[A] = Task.async { cb =>
      f.respond {
        case Return(a) => cb(a.right)
        case Throw(t)  => cb(t.left)
      }
    }
  }

  implicit class ScalazTaskToTwitterFuture[A](val t: Task[A]) extends AnyVal {
    def asFuture(handler: PartialFunction[Throwable, Unit] = PartialFunction.empty): Future[A] =
      new Promise[A] <| { p =>
        val cancel = new AtomicBoolean()
        p.setInterruptHandler {
          case th =>
            cancel.set(true)
            if (handler.isDefinedAt(th)) handler(th)
        }
        t.runAsyncInterruptibly({ _.fold(p.setException, p.setValue) }, cancel)
      }
  }

  private[finagle] object OneHundredContinueResponse
    extends DefaultHttpResponse(Version.HTTP_1_1, HttpResponseStatus.CONTINUE)

  def disableTracer(): Unit =
    Trace.disable()
} 

//设置package包名称以及导入依赖的类
package org.svars

import concurrent.{ Future, ExecutionContext, blocking }

import java.util.concurrent.atomic.{ AtomicInteger, AtomicBoolean }

case class HandlerPoolImpl[D, T](lattice: Lattice[D, T])(implicit executionContext: ExecutionContext) extends HandlerPool[D, T] {

  private val runningPuts = new AtomicInteger()

  private val hasHadInvalidPut = new AtomicBoolean()

  override def doPut(function: => Unit): Future[Unit] = Future {
    runningPuts.incrementAndGet

    try {
      function
    } catch {
      case e: LVarFrozenException[D, T] =>
        hasHadInvalidPut.set(true)
        throw e
    } finally {
      runningPuts.decrementAndGet
    }
  }

  override def doFuture(function: => Unit): Future[Unit] = Future {
    function
  }

  override def quiesce(function: => D): Future[D] = Future {
    if (hasHadInvalidPut.get) throw new IllegalStateException()
    blocking { while (runningPuts.get != 0) { } }
    function
  }

} 

//设置package包名称以及导入依赖的类
package com.bwsw.imp.common

import java.util.concurrent.atomic.AtomicBoolean


trait StartStopBehaviour {
  private val isStoppedFlag = new AtomicBoolean(true)
  def start() = {
    if(!isStoppedFlag.getAndSet(false))
      throw new IllegalStateException(s"Object $this is already started. Next start is available only after stop call.")
  }
  def stop() = {
    if(isStoppedFlag.getAndSet(true))
      throw new IllegalStateException(s"Object $this is already stopped. Next stop is available only after start call.")
  }

  def isStopped = isStoppedFlag.get()
} 

//设置package包名称以及导入依赖的类
package com.bwsw.sj.transaction.generator.server

import java.io.{DataInputStream, DataOutputStream}
import java.net.Socket
import java.util.concurrent.atomic.{AtomicBoolean, AtomicInteger, AtomicLong}

import com.bwsw.sj.common.utils.TransactionGeneratorLiterals

class TransactionGenerator(socket: Socket, doesServerWork: AtomicBoolean) extends Runnable {
  private val counter = new AtomicInteger(0)
  private val currentMillis = new AtomicLong(0)
  private val inputStream = new DataInputStream(socket.getInputStream)
  private val outputStream = new DataOutputStream(socket.getOutputStream)
  private val scale = TransactionGeneratorLiterals.scale

  override def run(): Unit = {
    try {
      while (doesServerWork.get()) {
        if (isClientAvailable) {
          val id = generateID()
          send(id)
        } else {
          close()
          return
        }
      }
    } catch {
      case ex: Exception =>
        close()
    }
  }

  private def isClientAvailable = {
    val clientRequestStatus = inputStream.read()

    clientRequestStatus != -1
  }

  private def generateID() = this.synchronized {
    val now = System.currentTimeMillis()
    if (now - currentMillis.get > 0) {
      currentMillis.set(now)
      counter.set(0)
    }
    now * scale + counter.getAndIncrement()
  }

  private def send(id: Long) {
    outputStream.writeLong(id)
  }

  private def close() = {
    inputStream.close()
    outputStream.close()
    socket.close()
  }
} 

//设置package包名称以及导入依赖的类
package io.eels.datastream

import java.util.concurrent.atomic.AtomicBoolean

trait Subscription {
  def cancel()
}

object Subscription {

  val empty = new Subscription {
    override def cancel(): Unit = ()
  }

  def fromRunning(running: AtomicBoolean) = new Subscription {
    assert(running.get)
    override def cancel(): Unit = running.set(false)
  }
} 

//设置package包名称以及导入依赖的类
package io.eels.datastream

import java.util.concurrent.LinkedBlockingQueue
import java.util.concurrent.atomic.{AtomicBoolean, AtomicMarkableReference, AtomicReference}

import com.sksamuel.exts.collection.BlockingQueueConcurrentIterator
import io.eels.Row
import io.eels.schema.StructType


class DataStreamPublisher(override val schema: StructType) extends DataStream {

  private val queue = new LinkedBlockingQueue[Seq[Row]]
  private val running = new AtomicBoolean(true)
  private val failure = new AtomicReference[Throwable](null)

  def isCancelled: Boolean = !running.get

  override def subscribe(subscriber: Subscriber[Seq[Row]]): Unit = {
    try {
      subscriber.subscribed(new Subscription {
        override def cancel(): Unit = {
          queue.clear()
          queue.put(Row.Sentinel)
          running.set(false)
        }
      })
      BlockingQueueConcurrentIterator(queue, Row.Sentinel).takeWhile(_ => running.get).foreach(subscriber.next)
      failure.get match {
        case t: Throwable => subscriber.error(t)
        case _ => subscriber.completed()
      }
    } catch {
      case t: Throwable => subscriber.error(t)
    }
  }

  def publish(row: Seq[Row]): Unit = queue.put(row)
  def error(t: Throwable): Unit = {
    failure.set(t)
    queue.clear()
    queue.add(Row.Sentinel)
  }
  def close(): Unit = queue.add(Row.Sentinel)
} 

//设置package包名称以及导入依赖的类
package io.eels.component.sequence

import java.util.concurrent.atomic.AtomicBoolean

import com.sksamuel.exts.Logging
import com.sksamuel.exts.io.Using
import io.eels._
import io.eels.datastream.{DataStream, Publisher, Subscriber, Subscription}
import io.eels.schema.StructType
import org.apache.hadoop.conf.Configuration
import org.apache.hadoop.fs.Path
import org.apache.hadoop.io.{BytesWritable, IntWritable, SequenceFile}

case class SequenceSource(path: Path)(implicit conf: Configuration) extends Source with Logging {
  logger.debug(s"Creating sequence source from $path")

  override def schema: StructType = SequenceSupport.schema(path)
  override def parts(): Seq[Publisher[Seq[Row]]] = List(new SequencePublisher(path))
}

object SequenceReaderIterator {
  def apply(schema: StructType, reader: SequenceFile.Reader): Iterator[Row] = new Iterator[Row] {
    private val k = new IntWritable()
    private val v = new BytesWritable()
    // throw away the header
    reader.next(k, v)
    override def next(): Row = Row(schema, SequenceSupport.toValues(v).toVector)
    override def hasNext(): Boolean = reader.next(k, v)
  }
}

class SequencePublisher(val path: Path)(implicit conf: Configuration) extends Publisher[Seq[Row]] with Logging with Using {

  override def subscribe(subscriber: Subscriber[Seq[Row]]): Unit = {
    try {
      using(SequenceSupport.createReader(path)) { reader =>
        val schema = SequenceSupport.schema(path)
        val running = new AtomicBoolean(true)
        subscriber.subscribed(Subscription.fromRunning(running))
        SequenceReaderIterator(schema, reader)
          .takeWhile(_ => running.get)
          .grouped(DataStream.DefaultBatchSize)
          .foreach(subscriber.next)

        subscriber.completed()
      }
    } catch {
      case t: Throwable => subscriber.error(t)
    }
  }
}