DebugChannel Class Reference

a receiver of debugs() messages (e.g., stderr or cache.log) More...

Inheritance diagram for DebugChannel:

Collaboration diagram for DebugChannel:

Classes
class	Logger
	output iterator for writing CompiledDebugMessages to a given channel More...

Public Types
using	EarlyMessages = std::unique_ptr< CompiledDebugMessages >

Public Member Functions
	DebugChannel (const char *aName)
virtual	~DebugChannel ()=default
	DebugChannel (DebugChannel &&)=delete
bool	collectingEarlyMessages () const
	whether we are still expecting (and buffering) early messages More...
void	stopEarlyMessageCollection ()
	end early message buffering, logging any saved messages More...
EarlyMessages	releaseEarlyMessages ()
void	log (const DebugMessageHeader &, const CompiledDebugMessageBody &)

Protected Member Functions
virtual bool	shouldWrite (const DebugMessageHeader &) const =0
virtual void	write (const DebugMessageHeader &, const CompiledDebugMessageBody &)=0
	write the corresponding debugs() message into the channel More...
void	saveMessage (const DebugMessageHeader &, const CompiledDebugMessageBody &)
	stores the given early message (if possible) or forgets it (otherwise) More...
void	writeToStream (FILE &, const DebugMessageHeader &, const CompiledDebugMessageBody &)
	Formats a validated debugs() record and writes it to the given FILE. More...
void	noteWritten (const DebugMessageHeader &)
	reacts to a written a debugs() message More...

Static Protected Member Functions
static void	StopSavingAndLog (DebugChannel &, DebugChannel *=nullptr)
	stop saving and log() any "early" messages, in recordNumber order More...

Protected Attributes
const char *const	name = nullptr
	unique channel label for debugging More...
DebugRecordCount	written = 0
	the number of messages sent to the underlying channel so far More...
DebugRecordCount	lastWrittenRecordNumber = 0
	DebugMessageHeader::recordNumber of the last message we wrote. More...
EarlyMessages	earlyMessages

Detailed Description

Definition at line 146 of file debug.cc.

Member Typedef Documentation

EarlyMessages

using DebugChannel::EarlyMessages = std::unique_ptr<CompiledDebugMessages>

Definition at line 149 of file debug.cc.

Constructor & Destructor Documentation

DebugChannel() [1/2]

DebugChannel::DebugChannel ( const char *  aName )

explicit

Definition at line 520 of file debug.cc.

~DebugChannel()

virtual DebugChannel::~DebugChannel ( )

virtualdefault

DebugChannel() [2/2]

DebugChannel::DebugChannel ( DebugChannel &&  )

delete

Member Function Documentation

collectingEarlyMessages()

bool DebugChannel::collectingEarlyMessages ( ) const

inline

Definition at line 158 of file debug.cc.

References earlyMessages.

Referenced by DebugModule::prepareToDie().

log()

void DebugChannel::log	(	const DebugMessageHeader &	header,
		const CompiledDebugMessageBody &	body
	)

Write the message to the channel if the channel accepts (such) messages. This writing may be delayed until the channel configuration is settled.

Definition at line 535 of file debug.cc.

References lastWrittenRecordNumber, DebugMessageHeader::recordNumber, saveMessage(), shouldWrite(), stopEarlyMessageCollection(), and write().

Referenced by DebugModule::log().

noteWritten()

void DebugChannel::noteWritten ( const DebugMessageHeader &  header )

protected

Definition at line 621 of file debug.cc.

References lastWrittenRecordNumber, DebugMessageHeader::recordNumber, and written.

Referenced by writeToStream().

releaseEarlyMessages()

EarlyMessages DebugChannel::releaseEarlyMessages ( )

inline

end early message buffering, without logging any saved messages

Returns

(a possibly empty container with) saved messages or nil

Definition at line 165 of file debug.cc.

References earlyMessages.

Referenced by StopSavingAndLog().

saveMessage()

void DebugChannel::saveMessage ( const DebugMessageHeader &  header, const CompiledDebugMessageBody &  body  )

protected

Definition at line 592 of file debug.cc.

References assert, earlyMessages, EarlyMessagesLevel, and DebugMessageHeader::level.

Referenced by log().

shouldWrite()

virtual bool DebugChannel::shouldWrite ( const DebugMessageHeader &  ) const

protectedpure virtual

whether we should write() the corresponding debugs() message now (assumes some higher-level code applied cache.log section/level filter)

Implemented in SyslogChannel, StderrChannel, and CacheLogChannel.

Referenced by log().

stopEarlyMessageCollection()

void DebugChannel::stopEarlyMessageCollection

(

)

Definition at line 527 of file debug.cc.

References earlyMessages, and StopSavingAndLog().

Referenced by log(), DebugModule::prepareToDie(), Debug::SettleStderr(), Debug::SettleSyslog(), Debug::StopCacheLogUse(), and DebugModule::useCacheLog().

StopSavingAndLog()

void DebugChannel::StopSavingAndLog ( DebugChannel &  channelA, DebugChannel *  channelBOrNil = nullptr  )

staticprotected

Definition at line 567 of file debug.cc.

References assert, debugs, CompiledDebugMessage::header, name, DebugMessageHeader::recordNumber, releaseEarlyMessages(), and written.

Referenced by stopEarlyMessageCollection(), and StderrChannel::takeOver().

write()

virtual void DebugChannel::write ( const DebugMessageHeader &  , const CompiledDebugMessageBody &    )

protectedpure virtual

Implemented in SyslogChannel, StderrChannel, and CacheLogChannel.

Referenced by log().

writeToStream()

void DebugChannel::writeToStream ( FILE &  destination, const DebugMessageHeader &  header, const CompiledDebugMessageBody &  body  )

protected

Definition at line 611 of file debug.cc.

References debugLogTime(), noteWritten(), ProcessLabel, and DebugMessageHeader::timestamp.

Referenced by CacheLogChannel::write(), and StderrChannel::write().

Member Data Documentation

earlyMessages

EarlyMessages DebugChannel::earlyMessages

protected

debugs() messages waiting for the channel configuration to settle (and the channel to open) so that their eligibility for logging can be determined (and the messages can be actually written somewhere)

Definition at line 233 of file debug.cc.

Referenced by collectingEarlyMessages(), releaseEarlyMessages(), saveMessage(), and stopEarlyMessageCollection().

lastWrittenRecordNumber

DebugRecordCount DebugChannel::lastWrittenRecordNumber = 0

protected

Definition at line 228 of file debug.cc.

Referenced by log(), and noteWritten().

name

const char* const DebugChannel::name = nullptr

protected

Definition at line 222 of file debug.cc.

Referenced by StopSavingAndLog().

written

DebugRecordCount DebugChannel::written = 0

protected

Definition at line 225 of file debug.cc.

Referenced by noteWritten(), and StopSavingAndLog().

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

• src/debug/debug.cc