def test_dataset_buffer__max_num_bytes():
filename = os.path.join(tempfile.gettempdir(), "store.h5")
try:
with h5py.File(filename, "w") as store:
columns = ("1", "2", "3", "4")
dataset = DatasetBuffer(store, "data", 100, np.float, columns)
assert dataset.max_num_bytes() == 3200
finally:
if os.path.exists(filename):
os.remove(filename)
class ValueContainer:
"""Container for a sequence of instances of ValueStorageBase."""
# These could potentially be reduced in bit lengths. Compression probably
# makes that unnecessary.
_TYPE_MAPPING = {
float: np.float,
int: np.int,
complex: np.complex,
}
def __init__(self,
value,
hdf_store,
path,
max_size,
dataset_property_type,
max_chunk_bytes=None,
store_timestamp=False):
group_name = os.path.dirname(path)
basename = os.path.basename(path)
try:
if basename in hdf_store[group_name].keys():
raise InvalidParameter(f"duplicate dataset name {basename}")
except KeyError:
# Don't bother checking each sub path.
pass
dtype = self._TYPE_MAPPING.get(value.value_type)
assert dtype is not None
scaleoffset = None
if dtype == np.float:
scaleoffset = 4
elif dtype == np.int:
scaleoffset = 0
attributes = {"type": dataset_property_type.value}
timestamp_path = None
if store_timestamp:
timestamp_path = self.timestamp_path(path)
self._timestamps = DatasetBuffer(
hdf_store,
timestamp_path,
max_size,
np.float,
["Timestamp"],
scaleoffset=scaleoffset,
max_chunk_bytes=max_chunk_bytes,
attributes={"type": DatasetPropertyType.TIMESTAMP.value},
)
attributes["timestamp_path"] = timestamp_path
else:
self._timestamps = None
self._dataset = DatasetBuffer(
hdf_store,
path,
max_size,
dtype,
value.make_columns(),
scaleoffset=scaleoffset,
max_chunk_bytes=max_chunk_bytes,
attributes=attributes,
)
@staticmethod
def timestamp_path(path):
return path + "Timestamp"
def append(self, value, timestamp=None):
"""Append a value to the container.
Parameters
----------
value : ValueStorageBase
timestamp : float | None
"""
self._dataset.write_value(value.value)
if self._timestamps is not None:
assert timestamp is not None
self._timestamps.write_value(timestamp)
def flush_data(self):
"""Flush any outstanding data to disk."""
self._dataset.flush_data()
if self._timestamps is not None:
self._timestamps.flush_data()
def max_num_bytes(self):
"""Return the maximum number of bytes the container could hold.
Returns
-------
int
"""
return self._dataset.max_num_bytes()
class ValueContainer:
"""Container for a sequence of instances of ValueStorageBase."""
def __init__(self,
values,
hdf_store,
path,
max_size,
elem_names,
dataset_property_type,
max_chunk_bytes=None,
store_time_step=False):
group_name = os.path.dirname(path)
basename = os.path.basename(path)
try:
if basename in hdf_store[group_name]:
raise InvalidParameter(f"duplicate dataset name {basename}")
except KeyError:
# Don't bother checking each sub path.
pass
dtype = values[0].value_type
scaleoffset = None
# There is no np.float128 on Windows.
if dtype in (float, np.float32, np.float64, np.longdouble):
scaleoffset = 4
time_step_path = None
max_size = max_size * len(values) if store_time_step else max_size
if store_time_step:
# Store indices for time step and element.
# Each row of this dataset corresponds to a row in the data.
# This will be required to interpret the raw data.
attributes = {"type": DatasetPropertyType.TIME_STEP.value}
time_step_path = self.time_step_path(path)
self._time_steps = DatasetBuffer(
hdf_store,
time_step_path,
max_size,
int,
["Time", "Name"],
scaleoffset=0,
max_chunk_bytes=max_chunk_bytes,
attributes=attributes,
)
columns = []
tmp_columns = values[0].make_columns()
for column in tmp_columns:
fields = column.split(ValueStorageBase.DELIMITER)
fields[0] = "AllNames"
columns.append(ValueStorageBase.DELIMITER.join(fields))
column_ranges = [0, len(tmp_columns)]
else:
columns = []
column_ranges = []
col_index = 0
for value in values:
tmp_columns = value.make_columns()
col_range = (col_index, len(tmp_columns))
column_ranges.append(col_range)
for column in tmp_columns:
columns.append(column)
col_index += 1
self._time_steps = None
attributes = {"type": dataset_property_type.value}
if store_time_step:
attributes["time_step_path"] = time_step_path
self._dataset = DatasetBuffer(
hdf_store,
path,
max_size,
dtype,
columns,
scaleoffset=scaleoffset,
max_chunk_bytes=max_chunk_bytes,
attributes=attributes,
names=elem_names,
column_ranges_per_name=column_ranges,
)
@staticmethod
def time_step_path(path):
return path + "TimeStep"
def append(self, values):
"""Append a value to the container.
Parameters
----------
value : list
list of ValueStorageBase
"""
if isinstance(values[0].value, list):
vals = [x for y in values for x in y.value]
else:
vals = [x.value for x in values]
self._dataset.write_value(vals)
def append_by_time_step(self, value, time_step, elem_index):
"""Append a value to the container.
Parameters
----------
value : ValueStorageBase
time_step : int
elem_index : int
"""
if isinstance(value.value, list):
vals = [x for x in value.value]
else:
vals = value.value
self._dataset.write_value(vals)
self._time_steps.write_value([time_step, elem_index])
def flush_data(self):
"""Flush any outstanding data to disk."""
self._dataset.flush_data()
if self._time_steps is not None:
self._time_steps.flush_data()
def max_num_bytes(self):
"""Return the maximum number of bytes the container could hold.
Returns
-------
int
"""
return self._dataset.max_num_bytes()