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iox::posix::NamedPipe🔗

Inherits from DesignPattern::Creation< NamedPipe, IpcChannelError >

Public Types🔗

Name
using cxx::string< MAX_MESSAGE_SIZE > Message_t
using concurrent::LockFreeQueue< Message_t, MAX_NUMBER_OF_MESSAGES > MessageQueue_t

Public Functions🔗

Name
NamedPipe(const NamedPipe & )
NamedPipe & operator=(const NamedPipe & )
NamedPipe()
For compatibility with IpcChannel alias, default ctor which creates an uninitialized NamedPipe.
NamedPipe(NamedPipe && rhs)
NamedPipe & operator=(NamedPipe && rhs)
~NamedPipe()
cxx::expected< IpcChannelError > destroy()
destroys an initialized named pipe.
cxx::expected< bool, IpcChannelError > isOutdated()
for compatibility with IpcChannelError
cxx::expected< IpcChannelError > trySend(const std::string & message) const
tries to send a message via the named pipe. if the pipe is full IpcChannelError::TIMEOUT is returned
cxx::expected< IpcChannelError > send(const std::string & message) const
sends a message via the named pipe. if the pipe is full this call is blocking until the message could be delivered
cxx::expected< IpcChannelError > timedSend(const std::string & message, const units::Duration & timeout) const
sends a message via the named pipe.
cxx::expected< std::string, IpcChannelError > tryReceive() const
tries to receive a message via the named pipe. if the pipe is empty IpcChannelError::TIMEOUT is returned
cxx::expected< std::string, IpcChannelError > receive() const
receives a message via the named pipe. if the pipe is empty this call is blocking until a message was received
cxx::expected< std::string, IpcChannelError > timedReceive(const units::Duration & timeout) const
receives a message via the named pipe.
cxx::expected< bool, IpcChannelError > unlinkIfExists(const IpcChannelName_t & name)
removes a named pipe artifact from the system

Public Attributes🔗

Name
constexpr uint64_t MAX_MESSAGE_SIZE
constexpr uint64_t MAX_NUMBER_OF_MESSAGES
constexpr uint64_t NULL_TERMINATOR_SIZE
constexpr units::Duration CYCLE_TIME
constexpr const char NAMED_PIPE_PREFIX

Friends🔗

Name
class DesignPattern::Creation< NamedPipe, IpcChannelError >

Additional inherited members🔗

Public Types inherited from DesignPattern::Creation< NamedPipe, IpcChannelError >

Name
using Creation< DerivedClass, ErrorType > CreationPattern_t
using iox::cxx::expected< DerivedClass, ErrorType > result_t
using ErrorType errorType_t

Public Functions inherited from DesignPattern::Creation< NamedPipe, IpcChannelError >

Name
template <typename... Targs>
result_t
create(Targs &&... args)
factory method which guarantees that either a working object is produced or an error value describing the error during construction
result_t verify(DerivedClass && newObject)
verifies if a class was created successfully
template <typename... Targs>
iox::cxx::expected< ErrorType >
placementCreate(void *const memory, Targs &&... args)
factory method which guarantees that either a working object is produced or an error value describing the error during construction
Creation() =default
Creation(Creation && rhs)
Creation(const Creation & rhs) =default
bool isInitialized() const
returns true if the object was constructed successfully, otherwise false

Protected Attributes inherited from DesignPattern::Creation< NamedPipe, IpcChannelError >

Name
bool m_isInitialized
ErrorType m_errorValue

Public Types Documentation🔗

using Message_t🔗

using iox::posix::NamedPipe::Message_t =  cxx::string<MAX_MESSAGE_SIZE>;

using MessageQueue_t🔗

using iox::posix::NamedPipe::MessageQueue_t =  concurrent::LockFreeQueue<Message_t, MAX_NUMBER_OF_MESSAGES>;

Public Functions Documentation🔗

function NamedPipe🔗

NamedPipe(
    const NamedPipe & 
)

function operator=🔗

NamedPipe & operator=(
    const NamedPipe & 
)

function NamedPipe🔗

NamedPipe()

For compatibility with IpcChannel alias, default ctor which creates an uninitialized NamedPipe.

function NamedPipe🔗

NamedPipe(
    NamedPipe && rhs
)

function operator=🔗

NamedPipe & operator=(
    NamedPipe && rhs
)

function ~NamedPipe🔗

~NamedPipe()

function destroy🔗

cxx::expected< IpcChannelError > destroy()

destroys an initialized named pipe.

Return: is always successful

function isOutdated🔗

cxx::expected< bool, IpcChannelError > isOutdated()

for compatibility with IpcChannelError

Return: always false

function trySend🔗

cxx::expected< IpcChannelError > trySend(
    const std::string & message
) const

tries to send a message via the named pipe. if the pipe is full IpcChannelError::TIMEOUT is returned

Return: on failure an error which describes the failure

function send🔗

cxx::expected< IpcChannelError > send(
    const std::string & message
) const

sends a message via the named pipe. if the pipe is full this call is blocking until the message could be delivered

Parameters:

  • message the message which should be sent, is not allowed to be longer then MAX_MESSAGE_SIZE

Return: success when message was sent otherwise an error which describes the failure

function timedSend🔗

cxx::expected< IpcChannelError > timedSend(
    const std::string & message,
    const units::Duration & timeout
) const

sends a message via the named pipe.

Parameters:

  • message the message which should be sent, is not allowed to be longer then MAX_MESSAGE_SIZE
  • timeout the timeout on how long this method should retry to send the message

Return: success when message was sent otherwise an error which describes the failure

function tryReceive🔗

cxx::expected< std::string, IpcChannelError > tryReceive() const

tries to receive a message via the named pipe. if the pipe is empty IpcChannelError::TIMEOUT is returned

Return: on success a string containing the message, otherwise an error which describes the failure

function receive🔗

cxx::expected< std::string, IpcChannelError > receive() const

receives a message via the named pipe. if the pipe is empty this call is blocking until a message was received

Return: on success a string containing the message, otherwise an error which describes the failure

function timedReceive🔗

cxx::expected< std::string, IpcChannelError > timedReceive(
    const units::Duration & timeout
) const

receives a message via the named pipe.

Parameters:

  • timeout the timeout on how long this method should retry to receive a message

Return: on success a string containing the message, otherwise an error which describes the failure

function unlinkIfExists🔗

static cxx::expected< bool, IpcChannelError > unlinkIfExists(
    const IpcChannelName_t & name
)

removes a named pipe artifact from the system

Return: true if the artifact was removed, false when no artifact was found and IpcChannelError::INTERNAL_LOGIC_ERROR when shm_unlink failed

Public Attributes Documentation🔗

variable MAX_MESSAGE_SIZE🔗

static constexpr uint64_t MAX_MESSAGE_SIZE = 4U * 1024U;

variable MAX_NUMBER_OF_MESSAGES🔗

static constexpr uint64_t MAX_NUMBER_OF_MESSAGES = 10U;

variable NULL_TERMINATOR_SIZE🔗

static constexpr uint64_t NULL_TERMINATOR_SIZE = 0U;

variable CYCLE_TIME🔗

static constexpr units::Duration CYCLE_TIME = units::Duration::fromMilliseconds(10);

variable NAMED_PIPE_PREFIX🔗

static constexpr const char NAMED_PIPE_PREFIX = "iox_np_";

Friends🔗

friend DesignPattern::Creation< NamedPipe, IpcChannelError >🔗

friend class DesignPattern::Creation< NamedPipe, IpcChannelError >(
    DesignPattern::Creation< NamedPipe, IpcChannelError > 
);

Updated on 2 April 2022 at 16:37:47 CEST