Class HDF5Meas

• Defined in File eh5_meas_api_v3.h

Class Documentation

class HDF5Meas

eCAL HDF5 measurement API

Public Types

typedef std::function<void(void)> CallbackFunction

Callback function type for pre file split notification.

Public Functions

HDF5Meas()

Constructor.

explicit HDF5Meas(const std::string &path, v3::eAccessType access = v3::eAccessType::RDONLY)

Constructor.

Parameters:

• path – Input file path / measurement directory path (see meas directory structure description bellow, in Open method).

• access – Access type

~HDF5Meas()

Destructor.

HDF5Meas(const HDF5Meas &other) = delete

Copy constructor deleted.

HDF5Meas &operator=(const HDF5Meas &other) = delete

Move assignemnt deleted.

HDF5Meas(HDF5Meas&&) = default

Move constructor.

HDF5Meas &operator=(HDF5Meas&&) = default

Move assignment.

bool Open(const std::string &path, v3::eAccessType access = v3::eAccessType::RDONLY)

Open file.

Parameters:

• path – Input file path / measurement directory path.

              Default measurement directory structure:
               - root directory e.g.: M:\measurement_directory\measurement01
               - documents directory:                                |_doc
               - hosts directories:                                  |_Host1 (e.g.: CARPC01)
                                                                     |_Host2 (e.g.: CARPC02)
  
              File path as input (eAccessType::RDONLY):
               - root directory (e.g.: M:\measurement_directory\measurement01) in this case all hosts subdirectories will be iterated,
               - host directory (e.g.: M:\measurement_directory\measurement01\CARPC01),
               - file path, path to file from measurement (e.g.: M:\measurement_directory\measurement01\CARPC01\meas01_05.hdf5).
  
              File path as output (eAccessType::CREATE):
               - full path to  measurement directory (recommended with host name) (e.g.: M:\measurement_directory\measurement01\CARPC01),
               - to set the name of the actual hdf5 file use SetFileBaseName method.
  

• access – Access type

Returns:

true if output (eAccessType::CREATE) measurement directory structure can be accessed/created, false otherwise. true if input (eAccessType::RDONLY) measurement/file path was opened, false otherwise.

bool Close()

Close file.

Returns:

true if succeeds, false if it fails

bool IsOk() const

Checks if file/measurement is ok.

Returns:

true if meas can be opened(read) or location is accessible(write), false otherwise

std::string GetFileVersion() const

Get the File Type Version of the current opened file.

Returns:

file version

size_t GetMaxSizePerFile() const

Gets maximum allowed size for an individual file.

Returns:

maximum size in MB

void SetMaxSizePerFile(size_t size)

Sets maximum allowed size for an individual file.

Parameters:

size – maximum size in MB

bool IsOneFilePerChannelEnabled() const

Whether each Channel shall be writte in its own file.

When enabled, data is clustered by channel and each channel is written to its own file. The filenames will consist of the basename and the channel name.

Returns:

true, if one file per channel is enabled

void SetOneFilePerChannelEnabled(bool enabled)

Enable / disable the creation of one individual file per channel.

When enabled, data is clustered by channel and each channel is written to its own file. The filenames will consist of the basename and the channel name.

Parameters:

enabled – Whether one file shall be created per channel

std::set<SChannel> GetChannels() const

Get the available channel names of the current opened file / measurement.

Returns:

Channels (channel name & id)

bool HasChannel(const eCAL::eh5::SChannel &channel) const

Check if channel exists in measurement.

Parameters:

channel – channel name & id

Returns:

true if exists, false otherwise

DataTypeInformation GetChannelDataTypeInformation(const SChannel &channel) const

Get data type information of the given channel.

Parameters:

channel_name – channel name

Returns:

channel type

void SetChannelDataTypeInformation(const SChannel &channel, const DataTypeInformation &info)

Set data type information of the given channel.

Parameters:

• channel_name – channel name

• info – datatype info of the channel

Returns:

channel type

long long GetMinTimestamp(const SChannel &channel) const

Gets minimum timestamp for specified channel.

Parameters:

channel – channel (name & id)

Returns:

minimum timestamp value

long long GetMaxTimestamp(const SChannel &channel) const

Gets maximum timestamp for specified channel.

Parameters:

channel – channel (name & id)

Returns:

maximum timestamp value

bool GetEntriesInfo(const SChannel &channel, EntryInfoSet &entries) const

Gets the header info for all data entries for the given channel Header = timestamp + entry id.

Parameters:

• channel – [in] channel (name & id)

• entries – [out] header info for all data entries

Returns:

true if succeeds, false if it fails

bool GetEntriesInfoRange(const SChannel &channel, long long begin, long long end, EntryInfoSet &entries) const

Gets the header info for data entries for the given channel included in given time range (begin->end) Header = timestamp + entry id.

Parameters:

• channel – [in] channel (name & id)

• begin – [in] time range begin timestamp

• end – [in] time range end timestamp

• entries – [out] header info for data entries in given range

Returns:

true if succeeds, false if it fails

bool GetEntryDataSize(long long entry_id, size_t &size) const

Gets data size of a specific entry.

Parameters:

• entry_id – [in] Entry ID

• size – [out] Entry data size

Returns:

true if succeeds, false if it fails

bool GetEntryData(long long entry_id, void *data) const

Gets data from a specific entry.

Parameters:

• entry_id – [in] Entry ID

• data – [out] Entry data

Returns:

true if succeeds, false if it fails

void SetFileBaseName(const std::string &base_name)

Set measurement file base name (desired name for the actual hdf5 files that will be created)

Parameters:

base_name – Name of the hdf5 files that will be created.

bool AddEntryToFile(const SWriteEntry &entry)

Add entry to file.

Parameters:

entry – the entry to be added to the file

Returns:

true if succeeds, false if it fails

void ConnectPreSplitCallback(CallbackFunction cb)

Connect callback for pre file split notification.

Parameters:

cb – callback function

void DisconnectPreSplitCallback()

Disconnect pre file split callback.