FdLoggingServer Class Reference

Base class that can receive log buffers from the FdLogging implementation and prints them to a file descriptor. More...

#include <TcpLogging.hxx>

Inheritance diagram for FdLoggingServer:

Public Member Functions
	FdLoggingServer (Service *service)
	Constructor.
Public Member Functions inherited from StateFlow< MessageType, QueueType >
	StateFlow (Service *service)
	Constructor.
Public Member Functions inherited from TypedStateFlow< MessageType, UntypedStateFlow< QueueType > >
	TypedStateFlow (Service *service)
	Constructor.
virtual	~TypedStateFlow ()
	Destructor.
void	send (MessageType *msg, unsigned priority=UINT_MAX) OVERRIDE
	Sends a message to the state flow for processing.
Public Member Functions inherited from UntypedStateFlow< QueueType >
	UntypedStateFlow (Service *service)
	Constructor.
Public Member Functions inherited from StateFlowWithQueue
void	notify () override
	Wakeup call arrived. Schedules *this on the executor.
bool	is_waiting ()
Public Member Functions inherited from StateFlowBase
void	run () override
	Callback from the executor.
Service *	service ()
	Return a pointer to the service I am bound to.
Public Member Functions inherited from Executable
void	test_deletion ()
Public Member Functions inherited from QMember
void	init ()
	Initiailize a QMember, in place of a public placement construction.
Public Member Functions inherited from LinkedObject< StateFlowWithQueue >
StateFlowWithQueue *	link_next ()
Public Member Functions inherited from FlowInterface< MessageType >
virtual Pool *	pool ()
virtual MessageType *	type_helper ()
	This function is never user in the code, but GDB can use it to infer the correct message types.
MessageType *	alloc ()
	Synchronously allocates a message buffer from the pool of this flow.
void	alloc_async (Executable *target)
	Asynchronously allocates a message buffer from the pool of this flow.

Protected Attributes
int	fd_ {-1}
	File descriptor to write log entries to.
Protected Attributes inherited from QMember
QMember *	next
	pointer to the next member in the queue
Protected Attributes inherited from LinkedObject< StateFlowWithQueue >
StateFlowWithQueue *	link_
	Linked list pointer.

Private Member Functions
Action	entry () override
	Arrival of new log message.
Action	write_done ()
	Called when the FD write is completed.
LogEntry *	input ()
	Helper function to get typed current message.

Private Attributes
StateFlowSelectHelper	selectHelper_ {this}
	Helper object for asynchronpus writing.

Additional Inherited Members
Public Types inherited from TypedStateFlow< MessageType, UntypedStateFlow< QueueType > >
typedef Base::Action	Action
	Allows using Action without having StateFlowBase:: prefix in front of it.
Public Types inherited from FlowInterface< MessageType >
typedef MessageType	message_type
	Stores the message template type for external reference.
Static Public Member Functions inherited from Singleton< FdLoggingServer >
static FdLoggingServer *	instance ()
static bool	exists ()
Static Public Member Functions inherited from StateFlowBase
template<class T , typename... Args>
static void	invoke_subflow_and_ignore_result (FlowInterface< Buffer< T > > *target_flow, Args &&... args)
	Calls a helper flow to perform some actions.
Static Public Member Functions inherited from LinkedObject< StateFlowWithQueue >
static StateFlowWithQueue *	link_head ()
static Atomic *	head_mu ()
	Locks the list for modification (at any entry!).
Static Public Member Functions inherited from FlowInterface< MessageType >
static MessageType *	cast_alloc (QMember *entry)
	Down casts and initializes an asynchronous allocation result to the appropriate flow's buffer type.
Protected Types inherited from UntypedStateFlow< QueueType >
typedef Action(StateFlowBase::*	Callback) ()
	State Flow callback prototype.
Protected Types inherited from StateFlowBase
typedef Action(StateFlowBase::*	Callback) ()
	State Flow callback prototype.
Protected Member Functions inherited from TypedStateFlow< MessageType, UntypedStateFlow< QueueType > >
void	release () OVERRIDE
	Unrefs the current buffer.
void	return_buffer ()
	For state flows that are operated using invoke_subflow_and_wait this is a way to hand back the buffer to the caller.
MessageType *	message ()
MessageType *	transfer_message ()
	Releases ownership of the current message.
Protected Member Functions inherited from UntypedStateFlow< QueueType >
void	send (BufferBase *msg, unsigned priority=UINT_MAX)
	Sends a message to the state flow for processing.
QMember *	queue_next (unsigned *priority) OVERRIDE
	Takes the front entry in the queue.
bool	queue_empty () OVERRIDE
Action	call_immediately (Callback c)
	Imediately call the next state upon return.
Protected Member Functions inherited from StateFlowWithQueue
	StateFlowWithQueue (Service *service)
	Constructor.
Action	exit ()
	Terminates the processing of this flow.
Action	release_and_exit ()
	Terminates the processing of the current message.
BufferBase *	message ()
BufferBase *	transfer_message ()
	Releases ownership of the current message.
void	reset_message (BufferBase *message, unsigned priority)
	Sets the current message being processed.
unsigned	priority ()
void	set_priority (unsigned priority)
	Overrides the current priority.
void	start_flow_at_init (Callback c)
	Call this from the constructor of the child class to do some work before the main queue processing loop begins.
Protected Member Functions inherited from StateFlowBase
	StateFlowBase (Service *service)
	Constructor.
	~StateFlowBase ()
	Destructor.
void	reset_flow (Callback c)
	Resets the flow to the specified state.
bool	is_state (Callback c)
bool	is_terminated ()
void	start_flow (Callback c)
	Resets the flow to the specified state and starts it.
Action	again ()
	Call the current state again via call_immediately.
Action	exit ()
	Terminate current StateFlow activity.
Action	delete_this ()
	Terminates the flow and deletes *this.
Action	set_terminated ()
	Sets the flow to terminated state.
Action	call_immediately (Callback c)
	Imediately call the next state upon return.
Action	wait ()
	Wait for an asynchronous call.
Action	wait_and_call (Callback c)
	Wait for resource to become available before proceeding to next state.
template<class T >
Action	allocate_and_call (FlowInterface< Buffer< T > > *target_flow, Callback c, Pool *pool=nullptr)
	Allocates a buffer from a pool and proceed to the next state when allocation is successful.
Action	allocate_and_call (Callback c, QAsync *queue)
	Allocates an entry from an asynchronous queue, and transitions to a state once the allocation is complete.
template<class T >
Buffer< T > *	full_allocation_result (FlowInterface< Buffer< T > > *target_flow)
	Takes the result of the asynchronous allocation without resetting the object.
template<class T >
T *	full_allocation_result (TypedQAsync< T > *queue)
	Takes the result of the asynchronous allocation without resetting the object.
template<class T >
void	cast_allocation_result (T **member)
	Takes the result of the asynchronous allocation without resetting the object.
template<class T >
Buffer< T > *	get_allocation_result (FlowInterface< Buffer< T > > *target_flow)
	Takes the result of the asynchronous allocation.
Action	yield_and_call (Callback c)
	Place the current flow to the back of the executor, and transition to a new state after we get the CPU again.
Action	yield ()
	Place the current flow to the back of the executor, and re-try the current state after we get the CPU again.
Action	sleep_and_call (::Timer *timer, long long timeout_nsec, Callback c)
	Suspends execution of this control flow for a specified time.
template<class T , typename... Args>
Action	invoke_subflow_and_wait (FlowInterface< Buffer< T > > *target_flow, Callback c, Args &&... args)
	Calls a helper flow to perform some actions.
Action	read_repeated (StateFlowSelectHelper *helper, int fd, void *buf, size_t size, Callback c, unsigned priority=Selectable::MAX_PRIO)
	Blocks until size bytes are read and then invokes the next state.
Action	read_single (StateFlowSelectHelper *helper, int fd, void *buf, size_t size, Callback c, unsigned priority=Selectable::MAX_PRIO)
	Attempts to read at most size_t bytes, and blocks the caller until at least one byte is read.
Action	read_nonblocking (StateFlowSelectHelper *helper, int fd, void *buf, size_t size, Callback c, unsigned priority=Selectable::MAX_PRIO)
	Attempts to read at most size bytes, and then invokes the next state, even if only zero bytes are available right now.
Action	read_repeated_with_timeout (StateFlowTimedSelectHelper *helper, long long timeout_nsec, int fd, void *buf, size_t size, Callback c, unsigned priority=Selectable::MAX_PRIO)
	Blocks until size bytes are read, or a timeout expires.
Action	internal_try_read ()
	Implementation state that gets repeatedly called upon every wakeup and tries to make progress on reading.
Action	write_repeated (StateFlowSelectHelper *helper, int fd, const void *buf, size_t size, Callback c, unsigned priority=Selectable::MAX_PRIO)
	Writes some data into a file descriptor, repeating the operation as necessary until all bytes are written.
Action	internal_try_write ()
	Implementation state that gets repeatedly called upon every wakeup and tries to make progress on writing.
Protected Member Functions inherited from QMember
	QMember ()
	Constructor.
	~QMember ()
	Destructor.
Protected Member Functions inherited from Atomic
void	lock ()
void	unlock ()
Protected Member Functions inherited from LinkedObject< StateFlowWithQueue >
StateFlowWithQueue *	link_this ()
	LinkedObject ()
	Constructor. Puts *this on the linked list.
	~LinkedObject ()
	Constructor. Removes *this from the linked list.
StateFlowWithQueue *	link_next ()
Static Protected Member Functions inherited from LinkedObject< StateFlowWithQueue >
static StateFlowWithQueue *	link_head ()
static Atomic *	head_mu ()
	Locks the list for modification (at any entry!).
Static Protected Attributes inherited from LinkedObject< StateFlowWithQueue >
static StateFlowWithQueue *	head_
	Beginning of the list.

Detailed Description

Base class that can receive log buffers from the FdLogging implementation and prints them to a file descriptor.

Definition at line 55 of file TcpLogging.hxx.

Constructor & Destructor Documentation

FdLoggingServer()

FdLoggingServer::FdLoggingServer ( Service *  service )

inline

Constructor.

Parameters

service

defines which executor to run this state flow.

Definition at line 63 of file TcpLogging.hxx.

Member Function Documentation

entry()

Action FdLoggingServer::entry ( )

inlineoverrideprivatevirtual

Arrival of new log message.

Returns

new state.

Implements TypedStateFlow< MessageType, UntypedStateFlow< QueueType > >.

Definition at line 70 of file TcpLogging.hxx.

input()

LogEntry * FdLoggingServer::input ( )

inlineprivate

Helper function to get typed current message.

Returns

log entry being processed.

Definition at line 93 of file TcpLogging.hxx.

write_done()

Action FdLoggingServer::write_done ( )

inlineprivate

Called when the FD write is completed.

Returns

new state

Definition at line 81 of file TcpLogging.hxx.

Member Data Documentation

fd_

int FdLoggingServer::fd_ {-1}

protected

File descriptor to write log entries to.

Definition at line 100 of file TcpLogging.hxx.

selectHelper_

StateFlowSelectHelper FdLoggingServer::selectHelper_ {this}

private

Helper object for asynchronpus writing.

Definition at line 104 of file TcpLogging.hxx.

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

• TcpLogging.hxx