XrdCl::PostMaster Class Reference

A hub for dispatching and receiving messages. More...

#include <XrdClPostMaster.hh>

Collaboration diagram for XrdCl::PostMaster:

Public Member Functions
	PostMaster ()
	Constructor.
virtual	~PostMaster ()
	Destructor.
void	CollapseRedirect (const URL &oldurl, const URL &newURL)
	Collapse channel URL - replace the URL of the channel.
void	DecFileInstCnt (const URL &url)
	Decrement file object instance count bound to this channel.
bool	Finalize ()
	Finalizer.
Status	ForceDisconnect (const URL &url)
	Shut down a channel.
Status	ForceDisconnect (const URL &url, bool hush)
	Shut down a channel.
Status	ForceReconnect (const URL &url)
	Reconnect the channel.
JobManager *	GetJobManager ()
	Get the job manager object user by the post master.
TaskManager *	GetTaskManager ()
	Get the task manager object user by the post master.
bool	Initialize ()
	Initializer.
bool	IsRunning ()
uint16_t	NbConnectedStrm (const URL &url)
	Get the number of connected data streams.
void	NotifyConnectHandler (const URL &url)
	Notify the global on-connect handler.
void	NotifyConnErrHandler (const URL &url, const XRootDStatus &status)
	Notify the global error connection handler.
Status	QueryTransport (const URL &url, uint16_t query, AnyObject &result)
Status	Redirect (const URL &url, Message *msg, MsgHandler *handler)
Status	RegisterEventHandler (const URL &url, ChannelEventHandler *handler)
	Register channel event handler.
bool	Reinitialize ()
	Reinitialize after fork.
Status	RemoveEventHandler (const URL &url, ChannelEventHandler *handler)
	Remove a channel event handler.
XRootDStatus	Send (const URL &url, Message *msg, MsgHandler *handler, bool stateful, time_t expires)
void	SetConnectionErrorHandler (std::function< void(const URL &, const XRootDStatus &)> handler)
	Set the global on-error on-connect handler for control streams.
void	SetOnConnectHandler (std::unique_ptr< Job > onConnJob)
	Set the global connection error handler.
void	SetOnDataConnectHandler (const URL &url, std::shared_ptr< Job > onConnJob)
	Set the on-connect handler for data streams.
bool	Start ()
	Start the post master.
bool	Stop ()
	Stop the postmaster.

Detailed Description

A hub for dispatching and receiving messages.

Definition at line 47 of file XrdClPostMaster.hh.

Constructor & Destructor Documentation

PostMaster()

XrdCl::PostMaster::PostMaster

(

)

Constructor.

Definition at line 106 of file XrdClPostMaster.cc.

                        : pImpl( new PostMasterImpl() )
  {
  }

~PostMaster()

XrdCl::PostMaster::~PostMaster ( )

virtual

Destructor.

Definition at line 113 of file XrdClPostMaster.cc.

  {
  }

Member Function Documentation

CollapseRedirect()

void XrdCl::PostMaster::CollapseRedirect	(	const URL &	oldurl,
		const URL &	newURL )

Collapse channel URL - replace the URL of the channel.

Definition at line 447 of file XrdClPostMaster.cc.

  {
    XrdSysRWLockHelper scopedDiscLock( pImpl->pDisconnectLock );
    XrdSysMutexHelper scopedMapLock( pImpl->pChannelMapMutex );
 
    //--------------------------------------------------------------------------
    // Get the passive channel
    //--------------------------------------------------------------------------
    PostMasterImpl::ChannelMap::iterator it =
        pImpl->pChannelMap.find( alias.GetChannelId() );
    Channel *passive = 0;
    if( it != pImpl->pChannelMap.end() )
      passive = it->second;
    //--------------------------------------------------------------------------
    // If the channel does not exist there's nothing to do
    //--------------------------------------------------------------------------
    else return;
 
    //--------------------------------------------------------------------------
    // Check if this URL is eligible for collapsing
    //--------------------------------------------------------------------------
    if( !passive->CanCollapse( url ) ) return;
 
    //--------------------------------------------------------------------------
    // Create the active channel
    //--------------------------------------------------------------------------
    TransportManager *trManager = DefaultEnv::GetTransportManager();
    TransportHandler *trHandler = trManager->GetHandler( url.GetProtocol() );
 
    if( !trHandler )
    {
      Log *log = DefaultEnv::GetLog();
      log->Error( PostMasterMsg, "Unable to get transport handler for %s "
                  "protocol", url.GetProtocol().c_str() );
      return;
    }
 
    Log *log = DefaultEnv::GetLog();
    log->Info( PostMasterMsg, "Label channel %s with alias %s.",
               url.GetHostId().c_str(), alias.GetHostId().c_str() );
 
    Channel *active = new Channel( alias, pImpl->pPoller, trHandler,
                                   pImpl->pTaskManager, pImpl->pJobManager, url );
    pImpl->pChannelMap[alias.GetChannelId()] = active;
    pImpl->pCollapsedMap[&passive->GetURL()] = passive;
 
    //--------------------------------------------------------------------------
    // The passive channel will be deallocated by TTL
    //--------------------------------------------------------------------------
  }

References XrdCl::Channel::CanCollapse(), XrdCl::Log::Error(), XrdCl::URL::GetChannelId(), XrdCl::TransportManager::GetHandler(), XrdCl::URL::GetHostId(), XrdCl::DefaultEnv::GetLog(), XrdCl::URL::GetProtocol(), XrdCl::DefaultEnv::GetTransportManager(), XrdCl::Channel::GetURL(), XrdCl::Log::Info(), and XrdCl::PostMasterMsg.

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DecFileInstCnt()

void XrdCl::PostMaster::DecFileInstCnt

(

const URL &

url

)

Decrement file object instance count bound to this channel.

Definition at line 501 of file XrdClPostMaster.cc.

  {
    XrdSysRWLockHelper scopedLock( pImpl->pDisconnectLock );
    Channel *channel = GetChannel( url );
 
    if( !channel ) return;
 
    return channel->DecFileInstCnt();
  }

References XrdCl::Channel::DecFileInstCnt().

Referenced by XrdCl::FileStateHandler::~FileStateHandler().

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Finalize()

bool XrdCl::PostMaster::Finalize

(

)

Finalizer.

Definition at line 147 of file XrdClPostMaster.cc.

  {
    //--------------------------------------------------------------------------
    // Clean up the channels
    //--------------------------------------------------------------------------
    if( !pImpl->pInitialized )
      return true;
 
    pImpl->pInitialized = false;
    pImpl->pJobManager->Finalize();
    PostMasterImpl::ChannelMap::iterator it;
 
    for( it = pImpl->pChannelMap.begin(); it != pImpl->pChannelMap.end(); ++it )
      delete it->second;
 
    pImpl->pChannelMap.clear();
    return pImpl->pPoller->Finalize();
  }

Referenced by XrdCl::DefaultEnv::GetPostMaster().

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ForceDisconnect() [1/2]

Status XrdCl::PostMaster::ForceDisconnect

(

const URL &

url

)

Shut down a channel.

Definition at line 324 of file XrdClPostMaster.cc.

  {
    return ForceDisconnect(url, false);
  }

References ForceDisconnect().

Referenced by ForceDisconnect(), and XrdCl::Stream::OnReadTimeout().

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ForceDisconnect() [2/2]

Status XrdCl::PostMaster::ForceDisconnect	(	const URL &	url,
		bool	hush )

Shut down a channel.

Definition at line 332 of file XrdClPostMaster.cc.

  {
    XrdSysRWLockHelper scopedLock( pImpl->pDisconnectLock, false );
    {
      //--------------------------------------------------------------------
      // See if this is called by channel replaced by collapse, reaching TTL
      //--------------------------------------------------------------------
      PostMasterImpl::CollapsedMap::iterator it =
          pImpl->pCollapsedMap.find( &url );
      if( it != pImpl->pCollapsedMap.end() )
      {
        Channel *passive = it->second;
        passive->ForceDisconnect( hush );
        delete passive;
        pImpl->pCollapsedMap.erase( it );
        return Status();
      }
    }
 
    PostMasterImpl::ChannelMap::iterator it =
        pImpl->pChannelMap.find( url.GetChannelId() );
 
    if( it == pImpl->pChannelMap.end() )
      return Status( stError, errInvalidOp );
 
    it->second->ForceDisconnect( hush );
    delete it->second;
    pImpl->pChannelMap.erase( it );
 
    return Status();
  }

References XrdCl::errInvalidOp, XrdCl::Channel::ForceDisconnect(), XrdCl::URL::GetChannelId(), and XrdCl::stError.

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ForceReconnect()

Status XrdCl::PostMaster::ForceReconnect

(

const URL &

url

)

Reconnect the channel.

Definition at line 364 of file XrdClPostMaster.cc.

  {
    XrdSysRWLockHelper scopedLock( pImpl->pDisconnectLock, false );
    PostMasterImpl::ChannelMap::iterator it =
        pImpl->pChannelMap.find( url.GetChannelId() );
 
    if( it == pImpl->pChannelMap.end() )
      return Status( stError, errInvalidOp );
 
    it->second->ForceReconnect();
    return Status();
  }

References XrdCl::errInvalidOp, XrdCl::URL::GetChannelId(), and XrdCl::stError.

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GetJobManager()

JobManager * XrdCl::PostMaster::GetJobManager

(

)

Get the job manager object user by the post master.

Definition at line 316 of file XrdClPostMaster.cc.

  {
    return pImpl->pJobManager;
  }

Referenced by XrdCl::FileStateHandler::Close(), XrdCl::Operation< HasHndl >::Run(), XrdEc::ScheduleHandler(), XrdEc::ScheduleHandler(), and XrdCl::FileStateHandler::TimeOutRequests().

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GetTaskManager()

TaskManager * XrdCl::PostMaster::GetTaskManager

(

)

Get the task manager object user by the post master.

Definition at line 308 of file XrdClPostMaster.cc.

  {
    return pImpl->pTaskManager;
  }

Referenced by XrdCl::DefaultEnv::GetPostMaster().

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Initialize()

bool XrdCl::PostMaster::Initialize

(

)

Initializer.

Definition at line 120 of file XrdClPostMaster.cc.

  {
    Env *env = DefaultEnv::GetEnv();
    std::string pollerPref = DefaultPollerPreference;
    env->GetString( "PollerPreference", pollerPref );
 
    pImpl->pPoller = PollerFactory::CreatePoller( pollerPref );
 
    if( !pImpl->pPoller )
      return false;
 
    bool st = pImpl->pPoller->Initialize();
 
    if( !st )
    {
      delete pImpl->pPoller;
      return false;
    }
 
    pImpl->pJobManager->Initialize();
    pImpl->pInitialized = true;
    return true;
  }

References XrdCl::PollerFactory::CreatePoller(), XrdCl::DefaultPollerPreference, XrdCl::DefaultEnv::GetEnv(), and XrdCl::Env::GetString().

Referenced by XrdCl::DefaultEnv::GetPostMaster().

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IsRunning()

bool XrdCl::PostMaster::IsRunning

(

)

Returns

: true if underlying threads are running, false otherwise

Definition at line 514 of file XrdClPostMaster.cc.

  {
    return pImpl->pRunning;
  }

NbConnectedStrm()

uint16_t XrdCl::PostMaster::NbConnectedStrm

(

const URL &

url

)

Get the number of connected data streams.

Definition at line 380 of file XrdClPostMaster.cc.

  {
    XrdSysRWLockHelper scopedLock( pImpl->pDisconnectLock );
    Channel *channel = GetChannel( url );
    if( !channel ) return 0;
    return channel->NbConnectedStrm();
  }

References XrdCl::Channel::NbConnectedStrm().

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NotifyConnectHandler()

void XrdCl::PostMaster::NotifyConnectHandler

(

const URL &

url

)

Notify the global on-connect handler.

Definition at line 421 of file XrdClPostMaster.cc.

  {
    XrdSysMutexHelper lck( pImpl->pMtx );
    if( pImpl->pOnConnJob )
    {
      URL *ptr = new URL( url );
      pImpl->pJobManager->QueueJob( pImpl->pOnConnJob.get(), ptr );
    }
  }

Referenced by XrdCl::Stream::OnConnect().

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NotifyConnErrHandler()

void XrdCl::PostMaster::NotifyConnErrHandler	(	const URL &	url,
		const XRootDStatus &	status )

Notify the global error connection handler.

Definition at line 434 of file XrdClPostMaster.cc.

  {
    XrdSysMutexHelper lck( pImpl->pMtx );
    if( pImpl->pOnConnErrCB )
    {
      ConnErrJob *job = new ConnErrJob( url, status, pImpl->pOnConnErrCB );
      pImpl->pJobManager->QueueJob( job, nullptr );
    }
  }

Referenced by XrdCl::Stream::OnConnectError().

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QueryTransport()

Status XrdCl::PostMaster::QueryTransport	(	const URL &	url,
		uint16_t	query,
		AnyObject &	result )

Query the transport handler for a given URL

Parameters

url	the channel to be queried
query	the query as defined in the TransportQuery struct or others that may be recognized by the protocol transport
result	the result of the query

Returns

status of the query

Definition at line 252 of file XrdClPostMaster.cc.

  {
    XrdSysRWLockHelper scopedLock( pImpl->pDisconnectLock );
    Channel *channel = 0;
    {
      XrdSysMutexHelper scopedLock2( pImpl->pChannelMapMutex );
      PostMasterImpl::ChannelMap::iterator it =
          pImpl->pChannelMap.find( url.GetChannelId() );
      if( it == pImpl->pChannelMap.end() )
        return Status( stError, errInvalidOp );
      channel = it->second;
    }
 
    if( !channel )
      return Status( stError, errNotSupported );
 
    return channel->QueryTransport( query, result );
  }

References XrdCl::errInvalidOp, XrdCl::errNotSupported, XrdCl::URL::GetChannelId(), XrdCl::Channel::QueryTransport(), and XrdCl::stError.

Referenced by XrdCl::FileSystem::DirList(), and XrdCl::FileStateHandler::PgRead().

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Redirect()

Status XrdCl::PostMaster::Redirect	(	const URL &	url,
		Message *	msg,
		MsgHandler *	handler )

Definition at line 238 of file XrdClPostMaster.cc.

  {
    RedirectorRegistry &registry  = RedirectorRegistry::Instance();
    VirtualRedirector *redirector = registry.Get( url );
    if( !redirector )
      return Status( stError, errInvalidOp );
    return redirector->HandleRequest( msg, inHandler );
  }

References XrdCl::errInvalidOp, XrdCl::RedirectorRegistry::Get(), XrdCl::VirtualRedirector::HandleRequest(), XrdCl::RedirectorRegistry::Instance(), and XrdCl::stError.

Referenced by XrdCl::MessageUtils::RedirectMessage().

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RegisterEventHandler()

Status XrdCl::PostMaster::RegisterEventHandler	(	const URL &	url,
		ChannelEventHandler *	handler )

Register channel event handler.

Definition at line 276 of file XrdClPostMaster.cc.

  {
    XrdSysRWLockHelper scopedLock( pImpl->pDisconnectLock );
    Channel *channel = GetChannel( url );
 
    if( !channel )
      return Status( stError, errNotSupported );
 
    channel->RegisterEventHandler( handler );
    return Status();
  }

References XrdCl::errNotSupported, XrdCl::Channel::RegisterEventHandler(), and XrdCl::stError.

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Reinitialize()

bool XrdCl::PostMaster::Reinitialize

(

)

Reinitialize after fork.

Definition at line 215 of file XrdClPostMaster.cc.

  {
    return true;
  }

RemoveEventHandler()

Status XrdCl::PostMaster::RemoveEventHandler	(	const URL &	url,
		ChannelEventHandler *	handler )

Remove a channel event handler.

Definition at line 292 of file XrdClPostMaster.cc.

  {
    XrdSysRWLockHelper scopedLock( pImpl->pDisconnectLock );
    Channel *channel = GetChannel( url );
 
    if( !channel )
      return Status( stError, errNotSupported );
 
    channel->RemoveEventHandler( handler );
    return Status();
  }

References XrdCl::errNotSupported, XrdCl::Channel::RemoveEventHandler(), and XrdCl::stError.

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Send()

XRootDStatus XrdCl::PostMaster::Send	(	const URL &	url,
		Message *	msg,
		MsgHandler *	handler,
		bool	stateful,
		time_t	expires )

Send the message asynchronously - the message is inserted into the send queue and a listener is called when the message is succesfsully pushed through the wire or when the timeout elapses

DEADLOCK WARNING: no lock should be taken while calling this method that are used in the callback as well.

Parameters

url	recipient of the message
msg	message to be sent
expires	unix timestamp after which a failure is reported to the handler
handler	handler will be notified about the status
stateful	physical stream disconnection causes an error

Returns

success if the message was successfully inserted into the send queues, failure otherwise

Definition at line 223 of file XrdClPostMaster.cc.

  {
    XrdSysRWLockHelper scopedLock( pImpl->pDisconnectLock );
    Channel *channel = GetChannel( url );
 
    if( !channel )
      return XRootDStatus( stError, errNotSupported );
 
    return channel->Send( msg, handler, stateful, expires );
  }

References XrdCl::errNotSupported, XrdCl::Channel::Send(), and XrdCl::stError.

Referenced by XrdCl::MessageUtils::SendMessage().

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SetConnectionErrorHandler()

void XrdCl::PostMaster::SetConnectionErrorHandler

(

std::function< void(const URL &, const XRootDStatus &)>

handler

)

Set the global on-error on-connect handler for control streams.

Definition at line 412 of file XrdClPostMaster.cc.

  {
    XrdSysMutexHelper lck( pImpl->pMtx );
    pImpl->pOnConnErrCB = std::move( handler );
  }

SetOnConnectHandler()

void XrdCl::PostMaster::SetOnConnectHandler

(

std::unique_ptr< Job >

onConnJob

)

Set the global connection error handler.

Set the global on-connect handler for control streams.

Definition at line 403 of file XrdClPostMaster.cc.

  {
    XrdSysMutexHelper lck( pImpl->pMtx );
    pImpl->pOnConnJob = std::move( onConnJob );
  }

Referenced by XrdPosixConfig::conTracker().

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SetOnDataConnectHandler()

void XrdCl::PostMaster::SetOnDataConnectHandler	(	const URL &	url,
		std::shared_ptr< Job >	onConnJob )

Set the on-connect handler for data streams.

Definition at line 391 of file XrdClPostMaster.cc.

  {
    XrdSysRWLockHelper scopedLock( pImpl->pDisconnectLock );
    Channel *channel = GetChannel( url );
    if( !channel ) return;
    channel->SetOnDataConnectHandler( onConnJob );
  }

References XrdCl::Channel::SetOnDataConnectHandler().

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Start()

bool XrdCl::PostMaster::Start

(

)

Start the post master.

Definition at line 169 of file XrdClPostMaster.cc.

  {
    if( !pImpl->pInitialized )
      return false;
 
    if( !pImpl->pPoller->Start() )
      return false;
 
    if( !pImpl->pTaskManager->Start() )
    {
      pImpl->pPoller->Stop();
      return false;
    }
 
    if( !pImpl->pJobManager->Start() )
    {
      pImpl->pPoller->Stop();
      pImpl->pTaskManager->Stop();
      return false;
    }
 
    pImpl->pRunning = true;
    return true;
  }

Referenced by XrdCl::DefaultEnv::GetPostMaster().

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Stop()

bool XrdCl::PostMaster::Stop

(

)

Stop the postmaster.

Definition at line 197 of file XrdClPostMaster.cc.

  {
    if( !pImpl->pInitialized || !pImpl->pRunning )
      return true;
 
    if( !pImpl->pJobManager->Stop() )
      return false;
    if( !pImpl->pPoller->Stop() )
      return false;
    if( !pImpl->pTaskManager->Stop() )
      return false;
    pImpl->pRunning = false;
    return true;
  }

Referenced by main().

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---

The documentation for this class was generated from the following files:

• XrdClPostMaster.hh
• XrdClPostMaster.cc