2021-04-22

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参考技术A Last login: Tue Apr 20 14:55:45 on ttys002

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foxconndeMac-mini:~ foxconn cd System/Library/L
LASecureIO/ LaunchDaemons/ LoginPlugins/
LaunchAgents/ LinguisticData/
LaunchAgentsIgnored/ LocationBundles/
foxconndeMac-mini:/ foxconn ls
bootps.plist
com.apple.AirPlayXPCHelper.plist
com.apple.AppleFileServer.plist
com.apple.AppleQEMUGuestAgent.plist
com.apple.AssetCache.builtin.plist
com.apple.AssetCacheLocatorService.plist
com.apple.AssetCacheManagerService.plist
com.apple.AssetCacheTetheratorService.plist
com.apple.CSCSupportd.plist
com.apple.CommCenterRootHelper.plist
com.apple.CoreAuthentication.daemon.plist
com.apple.CrashReporterSupportHelper.plist
com.apple.CryptoTokenKit.ahp.plist
com.apple.DataDetectorsSourceAccess.plist
com.apple.DesktopServicesHelper.plist
com.apple.DumpGPURestart.plist
com.apple.DumpPanic.plist
com.apple.FileCoordination.plist
com.apple.FontWorker.plist
com.apple.GSSCred.plist
com.apple.GameController.gamecontrollerd.plist
com.apple.IFCStart.plist
com.apple.IOAccelMemoryInfoCollector.plist
com.apple.IOBluetoothUSBDFU.plist
com.apple.InstallerDiagnostics.installerdiagd.plist
com.apple.InstallerDiagnostics.installerdiagwatcher.plist
com.apple.InstallerProgress.plist
com.apple.Kerberos.digest-service.plist
com.apple.Kerberos.kadmind.plist
com.apple.Kerberos.kcm.plist
com.apple.Kerberos.kdc.plist
com.apple.Kerberos.kpasswdd.plist
com.apple.KernelEventAgent.plist
com.apple.ManagedClient.cloudconfigurationd.plist
com.apple.ManagedClient.enroll.plist
com.apple.ManagedClient.plist
com.apple.ManagedClient.startup.plist
com.apple.MobileAccessoryUpdater.plist
com.apple.MobileFileIntegrity.plist
com.apple.NetworkLinkConditioner.plist
com.apple.NetworkSharing.plist
com.apple.ODSAgent.plist
com.apple.PasswordService.plist
com.apple.PerfPowerServices.plist
com.apple.PerfPowerServicesExtended.plist
com.apple.RFBEventHelper.plist
com.apple.RemoteDesktop.PrivilegeProxy.plist
com.apple.ReportCrash.Root.plist
com.apple.ReportMemoryException.plist
com.apple.SCHelper.plist
com.apple.SafeEjectGPUStartupDaemon.plist
com.apple.SubmitDiagInfo.plist
com.apple.TrustEvaluationAgent.system.plist
com.apple.UpdateSettings.plist
com.apple.UserEventAgent-System.plist
com.apple.UserNotificationCenter.plist
com.apple.WindowServer.plist
com.apple.WirelessRadioManager-osx.plist
com.apple.accessoryd.plist
com.apple.adid.plist
com.apple.afpfs_afpLoad.plist
com.apple.afpfs_checkafp.plist
com.apple.airport.wps.plist
com.apple.airportd.plist
com.apple.akd.plist
com.apple.alf.agent.plist
com.apple.analyticsd.plist
com.apple.apfsd.plist
com.apple.applefileutil.plist
com.apple.appleseed.fbahelperd.plist
com.apple.applessdstatistics.plist
com.apple.appstored.plist
com.apple.apsd.plist
com.apple.aslmanager.plist
com.apple.atrun.plist
com.apple.audio.AudioComponentRegistrar.daemon.plist
com.apple.audio.coreaudiod.plist
com.apple.audio.systemsoundserverd.plist
com.apple.auditd.plist
com.apple.autofsd.plist
com.apple.automountd.plist
com.apple.avbdeviced.plist
com.apple.awdd.plist
com.apple.backupd-helper.plist
com.apple.backupd.plist
com.apple.biokitaggdd.plist
com.apple.biometrickitd.plist
com.apple.bluetoothReporter.plist
com.apple.bluetoothaudiod.plist
com.apple.bluetoothd.plist
com.apple.bnepd.plist
com.apple.bootinstalld.plist
com.apple.bosreporter.plist
com.apple.boswatcher.plist
com.apple.bridgeOSUpdateProxy.plist
com.apple.bsd.dirhelper.plist
com.apple.captiveagent.plist
com.apple.cfnetwork.cfnetworkagent.plist
com.apple.cfprefsd.xpc.daemon.plist
com.apple.ckdiscretionaryd.plist
com.apple.cmio.AVCAssistant.plist
com.apple.cmio.AppleCameraAssistant.plist
com.apple.cmio.IIDCVideoAssistant.plist
com.apple.cmio.VDCAssistant.plist
com.apple.cmio.iosScreenCaptureAssistant.plist
com.apple.colorsync.displayservices.plist
com.apple.colorsyncd.plist
com.apple.commerced.plist
com.apple.comsat.plist
com.apple.configd.plist
com.apple.configureLocalKDC.plist
com.apple.contextstored.plist
com.apple.corebrightnessd.plist
com.apple.corecaptured.plist
com.apple.coreduetd.osx.plist
com.apple.coreservices.appleevents.plist
com.apple.coreservices.launchservicesd.plist
com.apple.coreservices.sharedfilelistd.plist
com.apple.coreservicesd.plist
com.apple.corestorage.corestoraged.plist
com.apple.corestorage.corestoragehelperd.plist
com.apple.coresymbolicationd.plist
com.apple.csrutil.report.plist
com.apple.ctkd.plist
com.apple.cvmsServ.plist
com.apple.dasd-OSX.plist
com.apple.datastored.plist
com.apple.deleted_helper.plist
com.apple.dhcp6d.plist
com.apple.diagnosticd.plist
com.apple.diagnosticextensions.osx.getmobilityinfo.helper.plist
com.apple.diagnosticextensions.osx.spotlight.helper.plist
com.apple.diagnosticextensions.osx.timemachine.helper.plist
com.apple.diagnosticextensions.osx.wifi.helper.plist
com.apple.diskarbitrationd.plist
com.apple.diskmanagementd.plist
com.apple.diskmanagementstartup.plist
com.apple.displaypolicyd.plist
com.apple.distnoted.xpc.daemon.plist
com.apple.dpaudiothru.plist
com.apple.dpd.plist
com.apple.dprivacyd.plist
com.apple.driver.eficheck.plist
com.apple.driver.ethcheck.plist
com.apple.dspluginhelperd.plist
com.apple.dvdplayback.setregion.plist
com.apple.dynamic_pager.plist
com.apple.eapolcfg_auth.plist
com.apple.efilogin-helper.plist
com.apple.emlog.plist
com.apple.emond.aslmanager.plist
com.apple.emond.plist
com.apple.endpointsecurity.endpointsecurityd.plist
com.apple.eoshostd.plist
com.apple.eppc.plist
com.apple.familycontrols.plist
com.apple.findmymac.plist
com.apple.findmymacmessenger.plist
com.apple.firmwaresyncd.plist
com.apple.fontd.plist
com.apple.fontmover.plist
com.apple.fpsd.plist
com.apple.fseventsd.plist
com.apple.ftp-proxy.plist
com.apple.getty.plist
com.apple.gkreport.plist
com.apple.gssd.plist
com.apple.hdiejectd.plist
com.apple.hidd.plist
com.apple.icloud.findmydeviced.plist
com.apple.icloud.searchpartyd.plist
com.apple.iconservices.iconservicesagent.plist
com.apple.iconservices.iconservicesd.plist
com.apple.ifdreader.plist
com.apple.installandsetup.systemmigrationd.plist
com.apple.installd.plist
com.apple.ionodecache.plist
com.apple.jetsamproperties.Mac.plist
com.apple.kcproxy.plist
com.apple.kdumpd.plist
com.apple.kextd.plist
com.apple.kuncd.plist
com.apple.locate.plist
com.apple.locationd.plist
com.apple.lockd.plist
com.apple.logd.plist
com.apple.logind.plist
com.apple.loginwindow.plist
com.apple.logkextloadsd.plist
com.apple.lsd.plist
com.apple.lskdd.plist
com.apple.mDNSResponder.plist
com.apple.mDNSResponderHelper.plist
com.apple.managedconfiguration.teslad.plist
com.apple.mbsystemadministration.plist
com.apple.mbusertrampoline.plist
com.apple.mdmclient.daemon.plist
com.apple.mdmclient.daemon.runatboot.plist
com.apple.mediaremoted.plist
com.apple.metadata.mds.index.plist
com.apple.metadata.mds.plist
com.apple.metadata.mds.scan.plist
com.apple.metadata.mds.spindump.plist
com.apple.metrickitd.plist
com.apple.mobile.keybagd.plist
com.apple.mobileactivationd.plist
com.apple.mobileassetd.plist
com.apple.msrpc.echosvc.plist
com.apple.msrpc.lsarpc.plist
com.apple.msrpc.mdssvc.plist
com.apple.msrpc.netlogon.plist
com.apple.msrpc.srvsvc.plist
com.apple.msrpc.wkssvc.plist
com.apple.multiversed.plist
com.apple.nehelper.plist
com.apple.nesessionmanager.plist
com.apple.netauth.sys.auth.plist
com.apple.netauth.sys.gui.plist
com.apple.netbiosd.plist
com.apple.newsyslog.plist
com.apple.nfcd.plist
com.apple.nfrestore.plist
com.apple.nfsconf.plist
com.apple.nfsd.plist
com.apple.noticeboard.state.plist
com.apple.notifyd.plist
com.apple.nsurlsessiond.plist
com.apple.nsurlstoraged.plist
com.apple.ocspd.plist
com.apple.odproxyd.plist
com.apple.opendirectoryd.plist
com.apple.osanalytics.osanalyticshelper.plist
com.apple.periodic-daily.plist
com.apple.periodic-monthly.plist
com.apple.periodic-weekly.plist
com.apple.pfctl.plist
com.apple.pfd.plist
com.apple.postfix.master.plist
com.apple.postfix.newaliases.plist
com.apple.powerd.plist
com.apple.powerd.swd.plist
com.apple.preferences.timezone.admintool.plist
com.apple.printtool.daemon.plist
com.apple.racoon.plist
com.apple.rapportd.plist
com.apple.recoverylogd.plist
com.apple.remotepairtool.plist
com.apple.revisiond.plist
com.apple.rpcbind.plist
com.apple.rtcreportingd.plist
com.apple.runningboardd.plist
com.apple.sandboxd.plist
com.apple.screensharing.plist
com.apple.scsid.plist
com.apple.secinitd.plist
com.apple.securechanneld.plist
com.apple.security.FDERecoveryAgent.plist
com.apple.security.agent.login.plist
com.apple.security.authhost.plist
com.apple.security.authtrampoline.plist
com.apple.security.syspolicy.plist
com.apple.securityd.plist
com.apple.securityd_service.plist
com.apple.seld.plist
com.apple.sessionlogoutd.plist
com.apple.signpost.signpost_reporter.plist
com.apple.smb.preferences.plist
com.apple.smbd.plist
com.apple.softwareupdate_firstrun_tasks.plist
com.apple.softwareupdated.plist
com.apple.speech.speechsynthesisd.plist
com.apple.spindump.plist
com.apple.startupdiskhelper.plist
com.apple.statd.notify.plist
com.apple.storagekitd.plist
com.apple.storeaccountd.daemon.plist
com.apple.storeagent.daemon.plist
com.apple.storeassetd.daemon.plist
com.apple.storedownloadd.daemon.plist
com.apple.storereceiptinstaller.plist
com.apple.suhelperd.plist
com.apple.symptomsd.plist
com.apple.sysdiagnose.plist
com.apple.sysdiagnose_helper.plist
com.apple.sysextd.plist
com.apple.syslogd.plist
com.apple.sysmond.plist
com.apple.system_installd.plist
com.apple.systemkeychain.plist
com.apple.systemstats.analysis.plist
com.apple.systemstats.daily.plist
com.apple.systemstats.microstackshot_periodic.plist
com.apple.tailspind.plist
com.apple.taskgated-helper.plist
com.apple.taskgated.plist
com.apple.tccd.system.plist
com.apple.testmanagerd.plist
com.apple.thermald.plist
com.apple.timed.plist
com.apple.timezoneupdates.tzd.plist
com.apple.touchbarserver.plist
com.apple.trustd.plist
com.apple.tzlinkd.plist
com.apple.ucupdate.plist
com.apple.uninstalld.plist
com.apple.unmountassistant.sysagent.plist
com.apple.usbd.plist
com.apple.uucp.plist
com.apple.var-db-dslocal-backup.plist
com.apple.vsdbutil.plist
com.apple.warmd.plist
com.apple.watchdogd.plist
com.apple.wifiFirmwareLoader.plist
com.apple.wifip2pd.plist
com.apple.wifivelocityd.plist
com.apple.wwand.plist
com.apple.xartstorageremoted.plist
com.apple.xpc.roleaccountd.plist
com.apple.xpc.smd.plist
com.apple.xpc.uscwoap.plist
com.apple.xsan.plist
com.apple.xsandaily.plist
com.apple.xscertadmin.plist
com.apple.xscertd-helper.plist
com.apple.xscertd.plist
com.vix.cron.plist
ntalk.plist
org.apache.httpd.plist
org.cups.cups-lpd.plist
org.cups.cupsd.plist
org.net-snmp.snmpd.plist
org.openldap.slapd.plist
ssh.plist
tftp.plist
foxconndeMac-mini:LaunchDaemons foxconn$ vi com.apple.smbd.plist

</dict>
</plist>

Guava文档翻译之 Service

概览

Guava的接口代表了一个有运行状态的对象,有启动和停止的方法。比如网络服务器,RPC服务器,以及计时器等,都可以实现Service接口。掌管像这样的服务的状态,需要正确地管理启动和关闭,因此会是繁琐的,特别是牵扯到多线程和调度。Guava提供了一个基本的骨架,可以帮你管理状态逻辑,以及同步的细节

一个Service的通常的生命周期是

 

一个已经停止的Service是不能被重启的。如果这个服务在启动或者运行、停止时失败,那么它会转入Service.State.FAILED状态。

一个服务可以被使用 startAsync()来异步地启动,这个方法会返回‘this‘引用,以方便地使用方法链。只有这个服务是NEW状态的时候才能调用。所以,你的程序应该有个唯一的地方来启动每一个服务。

停止服务是类似的,使用异步的stopAsync()方法。但是不像startAsync()方法,它可以安全地调用多次。这使得可以它可以应对在关闭服务器可能遇到的竞争问题。

服务也提供了几种方法来等待服务状态转换的完成。

  • 异步地使用addListener()。addListener()允许你添加一个Service.Listener,它会在服务的服务状态转换时被调用。需要注意的是,如果在这个listener被添加时,服务器已经不是NEW的状态。,那么已经发生过的状态转换是不会在这个listener上重放。
  • 异步地使用awaitRunning()。它是不可中断的(uniterruptible),不会抛出受检异常,会在服务启动完毕时返回。如果服务启动失败,会抛出一个IllegalStateException。类似的是 awaitTerminated(),调用它等待服务到达终止状态(TERMINATED or FAILED)。这两个方法都有重载的方法,允许指定超时时间。

 Service接口是微妙的。我们不建议直接实现它。你可以使用我们在guava提供几个虚类中的一个作为你的实现的基础。每个基类提供了一个特定的线程模型。

实现

AbstractIdleService

 AbstractIdleService骨架实现了一个Service,这个服务不需要在“running”状态执行任何动作,因此它在运行时也不需要一个线程,但是它仍然需要执行启动和停止的动作。实现这样的服务只需要继承AbstractIdleService,并且实现 startUp()以及shutDown()方法,

protected void startUp() {
  servlets.add(new GcStatsServlet());
}
protected void shutDown() {}

需要指出的是,任何对GcStatsServlet的查询已经运行于一个线程中了。因此,在这个服务运行时,我们不需要它执行任务操作。

AbstractExecutionThreadService

一个AbstractExecutionThreadService在同一个线程中执行启动,动行和关闭操作。你必须重写run() 方法,而且这个方法必须对关闭请求作为响应。比如,你或许会在一个工作循环中执行这些动作:

public void run() {
  while (isRunning()) {
    // perform a unit of work
  }
}

或者,你可以覆盖 triggerShutdown()方法,只要它能够使得run()方法返回。覆盖startUp()shutdown()方法是可选的,但是服务的状态会由这个骨架替你管理。

protected void startUp() {
  dispatcher.listenForConnections(port, queue);
}
protected void run() {
  Connection connection;
  while ((connection = queue.take() != POISON)) {
    process(connection);
  }
}
protected void triggerShutdown() {
  dispatcher.stopListeningForConnections(queue);
  queue.put(POISON);
}

需要注意的是start()调用了你的startUp()方法,为你创建了一个线程,并且在这个线程中调用run()方法。stop()方法调用了triggerShutdown()方法,并且等待线程停止。(译注:重点是run()方法不是在调用start()的线程中执行的)

AbstractScheduledService

一个AbstractScheduledService在它动行时执行一些周期性的任务。它的子类覆盖runOneIteration()来指定每个周期的任务,同时也需要覆盖我们熟悉的startUpshutDown() 方法

为了描述怎么调度执行,你需要实现scheduler()方法。通常而言,你会使用已经AbstractScheduledService.Scheduler提供的几个调度器中的一个,newFixedRateSchedule(initialDelay, delay, TimeUnit)或者newFixedDelaySchedule(initialDelay, delay, TimeUnit),与我们熟知的ScheduledExecutorService中的方法相类。自定义的调度器可以用来实现,请参见Javadoc.

AbstractService

如果你需要自己管理线程,就需要直接覆盖AbstractService。通常来说,以上提到的几种实现就够用了,但是,有些情况下是建议实现AbstractService的,比如,你对有自己的线程语义的东西进行建模,把它做成一个Service,你就会有自己特殊的线程相关的需求。

为了实现AbstractService,你需要实现这两个方法

  • doStart():doStart()在第一次调用startAsync()时被直接调用,你的doStart()方法应该完成所有初始化工作,并且在启动成功时调用,或者启动失败时调用。
  • doStop():doStop()在第一次调用stopAsync()时被调用,你的doStop()方法应该关闭你的服务,并且如果关闭成功,最终调用notifyStopped(),或者关闭失败,就调用notifyFailed()

你的doStartdoStop方法应该执行得很快。如果你需要进行昂贵的初始化工作,比如读取文件,开启网络连接,或者进行任何可能会阻塞的工作,你需要移动这些工作到另一个线程去做。

使用SerivceManager

Service的骨架实现之外,Guava还提供了一个ServiceManager类,它使得一些跟多个Service的实现相关操作操作更简单一些。使用Service的集合创建一个新的ServiceManager。然后你就可以管理它们了:

或者检查这些服务:

  • isHealthy() 在所有服务都在状态时返回true
  • 将会返回一个所有服务的一致的snapshot,以它们的状态作为索引。
  • startupTimes()将会返回从受管理的Service到它花了多少毫秒启动的map.Guava保证这个返回的map将按照启动时间(startup time)排序。

别然我们建议服务的生命周期通过ServiceManager来管理,但是通过其它机制进行的状态转换不会影响它的方法的正确性。比如,如果一些服务不是通过startAsync()启动的,监听器仍然会在合适的时机被调用,并且 awaitHealthy()也会照常工作。ServiceManager的唯一要求是在ServiceManager构造时,所有的Serivce都在NEW状态。

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