lsst.dax.apdb g4122c88930+ce54348158
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Public Member Functions | Public Attributes | Static Public Attributes | Protected Member Functions | Protected Attributes | List of all members
lsst.dax.apdb.apdbCassandra.ApdbCassandra Class Reference
Inheritance diagram for lsst.dax.apdb.apdbCassandra.ApdbCassandra:
lsst.dax.apdb.apdb.Apdb

Public Member Functions

 __init__ (self, ApdbCassandraConfig config)
 
None __del__ (self)
 
Optional[Table] tableDef (self, ApdbTables table)
 
None makeSchema (self, bool drop=False)
 
pandas.DataFrame getDiaObjects (self, sphgeom.Region region)
 
Optional[pandas.DataFrame] getDiaSources (self, sphgeom.Region region, Optional[Iterable[int]] object_ids, dafBase.DateTime visit_time)
 
Optional[pandas.DataFrame] getDiaForcedSources (self, sphgeom.Region region, Optional[Iterable[int]] object_ids, dafBase.DateTime visit_time)
 
list[ApdbInsertId]|None getInsertIds (self)
 
None deleteInsertIds (self, Iterable[ApdbInsertId] ids)
 
ApdbTableData getDiaObjectsHistory (self, Iterable[ApdbInsertId] ids)
 
ApdbTableData getDiaSourcesHistory (self, Iterable[ApdbInsertId] ids)
 
ApdbTableData getDiaForcedSourcesHistory (self, Iterable[ApdbInsertId] ids)
 
pandas.DataFrame getSSObjects (self)
 
None store (self, dafBase.DateTime visit_time, pandas.DataFrame objects, Optional[pandas.DataFrame] sources=None, Optional[pandas.DataFrame] forced_sources=None)
 
None storeSSObjects (self, pandas.DataFrame objects)
 
None reassignDiaSources (self, Mapping[int, int] idMap)
 
None dailyJob (self)
 
int countUnassociatedObjects (self)
 
- Public Member Functions inherited from lsst.dax.apdb.apdb.Apdb
ConfigurableField makeField (cls, str doc)
 

Public Attributes

 config
 

Static Public Attributes

 partition_zero_epoch = dafBase.DateTime(1970, 1, 1, 0, 0, 0, dafBase.DateTime.TAI)
 
- Static Public Attributes inherited from lsst.dax.apdb.apdb.Apdb
 ConfigClass = ApdbConfig
 

Protected Member Functions

AuthProvider|None _make_auth_provider (self, ApdbCassandraConfig config)
 
Mapping[Any, ExecutionProfile] _makeProfiles (self, ApdbCassandraConfig config)
 
pandas.DataFrame _getSources (self, sphgeom.Region region, Optional[Iterable[int]] object_ids, float mjd_start, float mjd_end, ApdbTables table_name)
 
ApdbTableData _get_history (self, ExtraTables table, Iterable[ApdbInsertId] ids)
 
None _storeInsertId (self, ApdbInsertId insert_id, dafBase.DateTime visit_time)
 
None _storeDiaObjects (self, pandas.DataFrame objs, dafBase.DateTime visit_time, ApdbInsertId|None insert_id)
 
None _storeDiaSources (self, ApdbTables table_name, pandas.DataFrame sources, dafBase.DateTime visit_time, ApdbInsertId|None insert_id)
 
None _storeDiaSourcesPartitions (self, pandas.DataFrame sources, dafBase.DateTime visit_time, ApdbInsertId|None insert_id)
 
None _storeObjectsPandas (self, pandas.DataFrame records, Union[ApdbTables, ExtraTables] table_name, Optional[Mapping] extra_columns=None, Optional[int] time_part=None)
 
pandas.DataFrame _add_obj_part (self, pandas.DataFrame df)
 
pandas.DataFrame _add_src_part (self, pandas.DataFrame sources, pandas.DataFrame objs)
 
pandas.DataFrame _add_fsrc_part (self, pandas.DataFrame sources, pandas.DataFrame objs)
 
int _time_partition (self, Union[float, dafBase.DateTime] time)
 
pandas.DataFrame _make_empty_catalog (self, ApdbTables table_name)
 
cassandra.query.PreparedStatement _prep_statement (self, str query)
 
Iterator[Tuple[cassandra.query.Statement, Tuple]] _combine_where (self, str prefix, List[Tuple[str, Tuple]] where1, List[Tuple[str, Tuple]] where2, Optional[str] suffix=None)
 
List[Tuple[str, Tuple]] _spatial_where (self, Optional[sphgeom.Region] region, bool use_ranges=False)
 
Tuple[List[str], List[Tuple[str, Tuple]]] _temporal_where (self, ApdbTables table, Union[float, dafBase.DateTime] start_time, Union[float, dafBase.DateTime] end_time, Optional[bool] query_per_time_part=None)
 

Protected Attributes

 _pixelization
 
 _keyspace
 
 _cluster
 
 _session
 
 _schema
 
 _partition_zero_epoch_mjd
 

Detailed Description

Implementation of APDB database on to of Apache Cassandra.

The implementation is configured via standard ``pex_config`` mechanism
using `ApdbCassandraConfig` configuration class. For an example of
different configurations check config/ folder.

Parameters
----------
config : `ApdbCassandraConfig`
    Configuration object.

Member Function Documentation

◆ _add_fsrc_part()

pandas.DataFrame lsst.dax.apdb.apdbCassandra.ApdbCassandra._add_fsrc_part (   self,
pandas.DataFrame  sources,
pandas.DataFrame  objs 
)
protected
Add apdb_part column to DiaForcedSource catalog.

Notes
-----
This method copies apdb_part value from a matching DiaObject record.
DiaObject catalog needs to have a apdb_part column filled by
``_add_obj_part`` method and DiaSource records need to be
associated to DiaObjects via ``diaObjectId`` column.

This overrides any existing column in a DataFrame with the same name
(apdb_part). Original DataFrame is not changed, copy of a DataFrame is
returned.

◆ _add_obj_part()

pandas.DataFrame lsst.dax.apdb.apdbCassandra.ApdbCassandra._add_obj_part (   self,
pandas.DataFrame  df 
)
protected
Calculate spatial partition for each record and add it to a
DataFrame.

Notes
-----
This overrides any existing column in a DataFrame with the same name
(apdb_part). Original DataFrame is not changed, copy of a DataFrame is
returned.

◆ _add_src_part()

pandas.DataFrame lsst.dax.apdb.apdbCassandra.ApdbCassandra._add_src_part (   self,
pandas.DataFrame  sources,
pandas.DataFrame  objs 
)
protected
Add apdb_part column to DiaSource catalog.

Notes
-----
This method copies apdb_part value from a matching DiaObject record.
DiaObject catalog needs to have a apdb_part column filled by
``_add_obj_part`` method and DiaSource records need to be
associated to DiaObjects via ``diaObjectId`` column.

This overrides any existing column in a DataFrame with the same name
(apdb_part). Original DataFrame is not changed, copy of a DataFrame is
returned.

◆ _combine_where()

Iterator[Tuple[cassandra.query.Statement, Tuple]] lsst.dax.apdb.apdbCassandra.ApdbCassandra._combine_where (   self,
str  prefix,
List[Tuple[str, Tuple]]  where1,
List[Tuple[str, Tuple]]  where2,
Optional[str]   suffix = None 
)
protected
Make cartesian product of two parts of WHERE clause into a series
of statements to execute.

Parameters
----------
prefix : `str`
    Initial statement prefix that comes before WHERE clause, e.g.
    "SELECT * from Table"

◆ _get_history()

ApdbTableData lsst.dax.apdb.apdbCassandra.ApdbCassandra._get_history (   self,
ExtraTables  table,
Iterable[ApdbInsertId ids 
)
protected
Return records from a particular table given set of insert IDs.

◆ _getSources()

pandas.DataFrame lsst.dax.apdb.apdbCassandra.ApdbCassandra._getSources (   self,
sphgeom.Region  region,
Optional[Iterable[int]]  object_ids,
float  mjd_start,
float  mjd_end,
ApdbTables  table_name 
)
protected
Return catalog of DiaSource instances given set of DiaObject IDs.

Parameters
----------
region : `lsst.sphgeom.Region`
    Spherical region.
object_ids :
    Collection of DiaObject IDs
mjd_start : `float`
    Lower bound of time interval.
mjd_end : `float`
    Upper bound of time interval.
table_name : `ApdbTables`
    Name of the table.

Returns
-------
catalog : `pandas.DataFrame`, or `None`
    Catalog containing DiaSource records. Empty catalog is returned if
    ``object_ids`` is empty.

◆ _make_auth_provider()

AuthProvider | None lsst.dax.apdb.apdbCassandra.ApdbCassandra._make_auth_provider (   self,
ApdbCassandraConfig  config 
)
protected
Make Cassandra authentication provider instance.

◆ _make_empty_catalog()

pandas.DataFrame lsst.dax.apdb.apdbCassandra.ApdbCassandra._make_empty_catalog (   self,
ApdbTables  table_name 
)
protected
Make an empty catalog for a table with a given name.

Parameters
----------
table_name : `ApdbTables`
    Name of the table.

Returns
-------
catalog : `pandas.DataFrame`
    An empty catalog.

◆ _makeProfiles()

Mapping[Any, ExecutionProfile] lsst.dax.apdb.apdbCassandra.ApdbCassandra._makeProfiles (   self,
ApdbCassandraConfig  config 
)
protected
Make all execution profiles used in the code.

◆ _prep_statement()

cassandra.query.PreparedStatement lsst.dax.apdb.apdbCassandra.ApdbCassandra._prep_statement (   self,
str  query 
)
protected
Convert query string into prepared statement.

◆ _spatial_where()

List[Tuple[str, Tuple]] lsst.dax.apdb.apdbCassandra.ApdbCassandra._spatial_where (   self,
Optional[sphgeom.Region]  region,
bool   use_ranges = False 
)
protected
Generate expressions for spatial part of WHERE clause.

Parameters
----------
region : `sphgeom.Region`
    Spatial region for query results.
use_ranges : `bool`
    If True then use pixel ranges ("apdb_part >= p1 AND apdb_part <=
    p2") instead of exact list of pixels. Should be set to True for
    large regions covering very many pixels.

Returns
-------
expressions : `list` [ `tuple` ]
    Empty list is returned if ``region`` is `None`, otherwise a list
    of one or more (expression, parameters) tuples

◆ _storeDiaObjects()

None lsst.dax.apdb.apdbCassandra.ApdbCassandra._storeDiaObjects (   self,
pandas.DataFrame  objs,
dafBase.DateTime  visit_time,
ApdbInsertId | None   insert_id 
)
protected
Store catalog of DiaObjects from current visit.

Parameters
----------
objs : `pandas.DataFrame`
    Catalog with DiaObject records
visit_time : `lsst.daf.base.DateTime`
    Time of the current visit.

◆ _storeDiaSources()

None lsst.dax.apdb.apdbCassandra.ApdbCassandra._storeDiaSources (   self,
ApdbTables  table_name,
pandas.DataFrame  sources,
dafBase.DateTime  visit_time,
ApdbInsertId | None  insert_id 
)
protected
Store catalog of DIASources or DIAForcedSources from current visit.

Parameters
----------
sources : `pandas.DataFrame`
    Catalog containing DiaSource records
visit_time : `lsst.daf.base.DateTime`
    Time of the current visit.

◆ _storeDiaSourcesPartitions()

None lsst.dax.apdb.apdbCassandra.ApdbCassandra._storeDiaSourcesPartitions (   self,
pandas.DataFrame  sources,
dafBase.DateTime  visit_time,
ApdbInsertId | None   insert_id 
)
protected
Store mapping of diaSourceId to its partitioning values.

Parameters
----------
sources : `pandas.DataFrame`
    Catalog containing DiaSource records
visit_time : `lsst.daf.base.DateTime`
    Time of the current visit.

◆ _storeObjectsPandas()

None lsst.dax.apdb.apdbCassandra.ApdbCassandra._storeObjectsPandas (   self,
pandas.DataFrame  records,
Union[ApdbTables, ExtraTables table_name,
Optional[Mapping]   extra_columns = None,
Optional[int]   time_part = None 
)
protected
Store generic objects.

Takes Pandas catalog and stores a bunch of records in a table.

Parameters
----------
records : `pandas.DataFrame`
    Catalog containing object records
table_name : `ApdbTables`
    Name of the table as defined in APDB schema.
extra_columns : `dict`, optional
    Mapping (column_name, column_value) which gives fixed values for
    columns in each row, overrides values in ``records`` if matching
    columns exist there.
time_part : `int`, optional
    If not `None` then insert into a per-partition table.

Notes
-----
If Pandas catalog contains additional columns not defined in table
schema they are ignored. Catalog does not have to contain all columns
defined in a table, but partition and clustering keys must be present
in a catalog or ``extra_columns``.

◆ _temporal_where()

Tuple[List[str], List[Tuple[str, Tuple]]] lsst.dax.apdb.apdbCassandra.ApdbCassandra._temporal_where (   self,
ApdbTables  table,
Union[float, dafBase.DateTime]  start_time,
Union[float, dafBase.DateTime]  end_time,
Optional[bool]   query_per_time_part = None 
)
protected
Generate table names and expressions for temporal part of WHERE
clauses.

Parameters
----------
table : `ApdbTables`
    Table to select from.
start_time : `dafBase.DateTime` or `float`
    Starting Datetime of MJD value of the time range.
start_time : `dafBase.DateTime` or `float`
    Starting Datetime of MJD value of the time range.
query_per_time_part : `bool`, optional
    If None then use ``query_per_time_part`` from configuration.

Returns
-------
tables : `list` [ `str` ]
    List of the table names to query.
expressions : `list` [ `tuple` ]
    A list of zero or more (expression, parameters) tuples.

◆ _time_partition()

int lsst.dax.apdb.apdbCassandra.ApdbCassandra._time_partition (   self,
Union[float, dafBase.DateTime]  time 
)
protected
Calculate time partiton number for a given time.

Parameters
----------
time : `float` or `lsst.daf.base.DateTime`
    Time for which to calculate partition number. Can be float to mean
    MJD or `lsst.daf.base.DateTime`

Returns
-------
partition : `int`
    Partition number for a given time.

◆ countUnassociatedObjects()

int lsst.dax.apdb.apdbCassandra.ApdbCassandra.countUnassociatedObjects (   self)
Return the number of DiaObjects that have only one DiaSource
associated with them.

Used as part of ap_verify metrics.

Returns
-------
count : `int`
    Number of DiaObjects with exactly one associated DiaSource.

Notes
-----
This method can be very inefficient or slow in some implementations.

Reimplemented from lsst.dax.apdb.apdb.Apdb.

◆ dailyJob()

None lsst.dax.apdb.apdbCassandra.ApdbCassandra.dailyJob (   self)
Implement daily activities like cleanup/vacuum.

What should be done during daily activities is determined by
specific implementation.

Reimplemented from lsst.dax.apdb.apdb.Apdb.

◆ deleteInsertIds()

None lsst.dax.apdb.apdbCassandra.ApdbCassandra.deleteInsertIds (   self,
Iterable[ApdbInsertId ids 
)
Remove insert identifiers from the database.

Parameters
----------
ids : `iterable` [`ApdbInsertId`]
    Insert identifiers, can include items returned from `getInsertIds`.

Notes
-----
This method causes Apdb to forget about specified identifiers. If there
are any auxiliary data associated with the identifiers, it is also
removed from database (but data in regular tables is not removed).
This method should be called after successful transfer of data from
APDB to PPDB to free space used by history.

Reimplemented from lsst.dax.apdb.apdb.Apdb.

◆ getDiaForcedSources()

Optional[pandas.DataFrame] lsst.dax.apdb.apdbCassandra.ApdbCassandra.getDiaForcedSources (   self,
sphgeom.Region  region,
Optional[Iterable[int]]  object_ids,
dafBase.DateTime   visit_time 
)
Return catalog of DiaForcedSource instances from a given region.

Parameters
----------
region : `lsst.sphgeom.Region`
    Region to search for DIASources.
object_ids : iterable [ `int` ], optional
    List of DiaObject IDs to further constrain the set of returned
    sources. If list is empty then empty catalog is returned with a
    correct schema. If `None` then returned sources are not
    constrained. Some implementations may not support latter case.
visit_time : `lsst.daf.base.DateTime`
    Time of the current visit.

Returns
-------
catalog : `pandas.DataFrame`, or `None`
    Catalog containing DiaSource records. `None` is returned if
    ``read_forced_sources_months`` configuration parameter is set to 0.

Raises
------
NotImplementedError
    May be raised by some implementations if ``object_ids`` is `None`.

Notes
-----
This method returns DiaForcedSource catalog for a region with
additional filtering based on DiaObject IDs. Only a subset of DiaSource
history is returned limited by ``read_forced_sources_months`` config
parameter, w.r.t. ``visit_time``. If ``object_ids`` is empty then an
empty catalog is always returned with the correct schema
(columns/types). If ``object_ids`` is `None` then no filtering is
performed and some of the returned records may be outside the specified
region.

Reimplemented from lsst.dax.apdb.apdb.Apdb.

◆ getDiaForcedSourcesHistory()

ApdbTableData lsst.dax.apdb.apdbCassandra.ApdbCassandra.getDiaForcedSourcesHistory (   self,
Iterable[ApdbInsertId ids 
)
Return catalog of DiaForcedSource instances from a given time
period.

Parameters
----------
ids : `iterable` [`ApdbInsertId`]
    Insert identifiers, can include items returned from `getInsertIds`.

Returns
-------
data : `ApdbTableData`
    Catalog containing DiaForcedSource records. In addition to all
    regular columns it will contain ``insert_id`` column.

Notes
-----
This part of API may not be very stable and can change before the
implementation finalizes.

Reimplemented from lsst.dax.apdb.apdb.Apdb.

◆ getDiaObjects()

pandas.DataFrame lsst.dax.apdb.apdbCassandra.ApdbCassandra.getDiaObjects (   self,
sphgeom.Region  region 
)
Return catalog of DiaObject instances from a given region.

This method returns only the last version of each DiaObject. Some
records in a returned catalog may be outside the specified region, it
is up to a client to ignore those records or cleanup the catalog before
futher use.

Parameters
----------
region : `lsst.sphgeom.Region`
    Region to search for DIAObjects.

Returns
-------
catalog : `pandas.DataFrame`
    Catalog containing DiaObject records for a region that may be a
    superset of the specified region.

Reimplemented from lsst.dax.apdb.apdb.Apdb.

◆ getDiaObjectsHistory()

ApdbTableData lsst.dax.apdb.apdbCassandra.ApdbCassandra.getDiaObjectsHistory (   self,
Iterable[ApdbInsertId ids 
)
Return catalog of DiaObject instances from a given time period
including the history of each DiaObject.

Parameters
----------
ids : `iterable` [`ApdbInsertId`]
    Insert identifiers, can include items returned from `getInsertIds`.

Returns
-------
data : `ApdbTableData`
    Catalog containing DiaObject records. In addition to all regular
    columns it will contain ``insert_id`` column.

Notes
-----
This part of API may not be very stable and can change before the
implementation finalizes.

Reimplemented from lsst.dax.apdb.apdb.Apdb.

◆ getDiaSources()

Optional[pandas.DataFrame] lsst.dax.apdb.apdbCassandra.ApdbCassandra.getDiaSources (   self,
sphgeom.Region  region,
Optional[Iterable[int]]  object_ids,
dafBase.DateTime   visit_time 
)
Return catalog of DiaSource instances from a given region.

Parameters
----------
region : `lsst.sphgeom.Region`
    Region to search for DIASources.
object_ids : iterable [ `int` ], optional
    List of DiaObject IDs to further constrain the set of returned
    sources. If `None` then returned sources are not constrained. If
    list is empty then empty catalog is returned with a correct
    schema.
visit_time : `lsst.daf.base.DateTime`
    Time of the current visit.

Returns
-------
catalog : `pandas.DataFrame`, or `None`
    Catalog containing DiaSource records. `None` is returned if
    ``read_sources_months`` configuration parameter is set to 0.

Notes
-----
This method returns DiaSource catalog for a region with additional
filtering based on DiaObject IDs. Only a subset of DiaSource history
is returned limited by ``read_sources_months`` config parameter, w.r.t.
``visit_time``. If ``object_ids`` is empty then an empty catalog is
always returned with the correct schema (columns/types). If
``object_ids`` is `None` then no filtering is performed and some of the
returned records may be outside the specified region.

Reimplemented from lsst.dax.apdb.apdb.Apdb.

◆ getDiaSourcesHistory()

ApdbTableData lsst.dax.apdb.apdbCassandra.ApdbCassandra.getDiaSourcesHistory (   self,
Iterable[ApdbInsertId ids 
)
Return catalog of DiaSource instances from a given time period.

Parameters
----------
ids : `iterable` [`ApdbInsertId`]
    Insert identifiers, can include items returned from `getInsertIds`.

Returns
-------
data : `ApdbTableData`
    Catalog containing DiaSource records. In addition to all regular
    columns it will contain ``insert_id`` column.

Notes
-----
This part of API may not be very stable and can change before the
implementation finalizes.

Reimplemented from lsst.dax.apdb.apdb.Apdb.

◆ getInsertIds()

list[ApdbInsertId] | None lsst.dax.apdb.apdbCassandra.ApdbCassandra.getInsertIds (   self)
Return collection of insert identifiers known to the database.

Returns
-------
ids : `list` [`ApdbInsertId`] or `None`
    List of identifiers, they may be time-ordered if database supports
    ordering. `None` is returned if database is not configured to store
    insert identifiers.

Reimplemented from lsst.dax.apdb.apdb.Apdb.

◆ getSSObjects()

pandas.DataFrame lsst.dax.apdb.apdbCassandra.ApdbCassandra.getSSObjects (   self)
Return catalog of SSObject instances.

Returns
-------
catalog : `pandas.DataFrame`
    Catalog containing SSObject records, all existing records are
    returned.

Reimplemented from lsst.dax.apdb.apdb.Apdb.

◆ makeSchema()

None lsst.dax.apdb.apdbCassandra.ApdbCassandra.makeSchema (   self,
bool   drop = False 
)
Create or re-create whole database schema.

Parameters
----------
drop : `bool`
    If True then drop all tables before creating new ones.

Reimplemented from lsst.dax.apdb.apdb.Apdb.

◆ reassignDiaSources()

None lsst.dax.apdb.apdbCassandra.ApdbCassandra.reassignDiaSources (   self,
Mapping[int, int]  idMap 
)
Associate DiaSources with SSObjects, dis-associating them
from DiaObjects.

Parameters
----------
idMap : `Mapping`
    Maps DiaSource IDs to their new SSObject IDs.

Raises
------
ValueError
    Raised if DiaSource ID does not exist in the database.

Reimplemented from lsst.dax.apdb.apdb.Apdb.

◆ store()

None lsst.dax.apdb.apdbCassandra.ApdbCassandra.store (   self,
dafBase.DateTime  visit_time,
pandas.DataFrame  objects,
Optional[pandas.DataFrame]   sources = None,
Optional[pandas.DataFrame]   forced_sources = None 
)
Store all three types of catalogs in the database.

Parameters
----------
visit_time : `lsst.daf.base.DateTime`
    Time of the visit.
objects : `pandas.DataFrame`
    Catalog with DiaObject records.
sources : `pandas.DataFrame`, optional
    Catalog with DiaSource records.
forced_sources : `pandas.DataFrame`, optional
    Catalog with DiaForcedSource records.

Notes
-----
This methods takes DataFrame catalogs, their schema must be
compatible with the schema of APDB table:

  - column names must correspond to database table columns
  - types and units of the columns must match database definitions,
    no unit conversion is performed presently
  - columns that have default values in database schema can be
    omitted from catalog
  - this method knows how to fill interval-related columns of DiaObject
    (validityStart, validityEnd) they do not need to appear in a
    catalog
  - source catalogs have ``diaObjectId`` column associating sources
    with objects

Reimplemented from lsst.dax.apdb.apdb.Apdb.

◆ storeSSObjects()

None lsst.dax.apdb.apdbCassandra.ApdbCassandra.storeSSObjects (   self,
pandas.DataFrame  objects 
)
Store or update SSObject catalog.

Parameters
----------
objects : `pandas.DataFrame`
    Catalog with SSObject records.

Notes
-----
If SSObjects with matching IDs already exist in the database, their
records will be updated with the information from provided records.

Reimplemented from lsst.dax.apdb.apdb.Apdb.

◆ tableDef()

Optional[Table] lsst.dax.apdb.apdbCassandra.ApdbCassandra.tableDef (   self,
ApdbTables  table 
)
Return table schema definition for a given table.

Parameters
----------
table : `ApdbTables`
    One of the known APDB tables.

Returns
-------
tableSchema : `felis.simple.Table` or `None`
    Table schema description, `None` is returned if table is not
    defined by this implementation.

Reimplemented from lsst.dax.apdb.apdb.Apdb.


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