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# orm/uowdumper.py
# Copyright (C) 2005, 2006, 2007, 2008 Michael Bayer mike_mp@zzzcomputing.com
#
# This module is part of SQLAlchemy and is released under
# the MIT License: http://www.opensource.org/licenses/mit-license.php
"""Dumps out a string representation of a UOWTask structure"""
from sqlalchemy.orm import unitofwork
from sqlalchemy.orm import util as mapperutil
from sqlalchemy import util
class UOWDumper(unitofwork.UOWExecutor):
def __init__(self, tasks, buf, verbose=False):
self.verbose = verbose
self.indent = 0
self.tasks = tasks
self.buf = buf
self.headers = {}
self.execute(None, tasks)
def execute(self, trans, tasks, isdelete=None):
if isdelete is not True:
for task in tasks:
self._execute(trans, task, False)
if isdelete is not False:
for task in util.reversed(tasks):
self._execute(trans, task, True)
def _execute(self, trans, task, isdelete):
try:
i = self._indent()
if i:
i = i[:-1] + "+-"
self.buf.write(i + " " + self._repr_task(task))
self.buf.write(" (" + (isdelete and "delete " or "save/update ") + "phase) \n")
self.indent += 1
super(UOWDumper, self).execute(trans, [task], isdelete)
finally:
self.indent -= 1
def save_objects(self, trans, task):
# sort elements to be inserted by insert order
def comparator(a, b):
if a.state is None:
x = None
elif not hasattr(a.state, 'insert_order'):
x = None
else:
x = a.state.insert_order
if b.state is None:
y = None
elif not hasattr(b.state, 'insert_order'):
y = None
else:
y = b.state.insert_order
return cmp(x, y)
l = list(task.polymorphic_tosave_elements)
l.sort(comparator)
for rec in l:
if rec.listonly:
continue
self.header("Save elements"+ self._inheritance_tag(task))
self.buf.write(self._indent()[:-1] + "+-" + self._repr_task_element(rec) + "\n")
self.closeheader()
def delete_objects(self, trans, task):
for rec in task.polymorphic_todelete_elements:
if rec.listonly:
continue
self.header("Delete elements"+ self._inheritance_tag(task))
self.buf.write(self._indent() + "- " + self._repr_task_element(rec) + "\n")
self.closeheader()
def _inheritance_tag(self, task):
if not self.verbose:
return ""
else:
return (" (inheriting task %s)" % self._repr_task(task))
def header(self, text):
"""Write a given header just once."""
if not self.verbose:
return
try:
self.headers[text]
except KeyError:
self.buf.write(self._indent() + "- " + text + "\n")
self.headers[text] = True
def closeheader(self):
if not self.verbose:
return
self.buf.write(self._indent() + "- ------\n")
def execute_dependency(self, transaction, dep, isdelete):
self._dump_processor(dep, isdelete)
def execute_save_steps(self, trans, task):
super(UOWDumper, self).execute_save_steps(trans, task)
def execute_delete_steps(self, trans, task):
super(UOWDumper, self).execute_delete_steps(trans, task)
def execute_dependencies(self, trans, task, isdelete=None):
super(UOWDumper, self).execute_dependencies(trans, task, isdelete)
def execute_cyclical_dependencies(self, trans, task, isdelete):
self.header("Cyclical %s dependencies" % (isdelete and "delete" or "save"))
super(UOWDumper, self).execute_cyclical_dependencies(trans, task, isdelete)
self.closeheader()
def execute_per_element_childtasks(self, trans, task, isdelete):
super(UOWDumper, self).execute_per_element_childtasks(trans, task, isdelete)
def execute_element_childtasks(self, trans, element, isdelete):
self.header("%s subelements of UOWTaskElement(%s)" % ((isdelete and "Delete" or "Save"), hex(id(element))))
super(UOWDumper, self).execute_element_childtasks(trans, element, isdelete)
self.closeheader()
def _dump_processor(self, proc, deletes):
if deletes:
val = proc.targettask.polymorphic_todelete_elements
else:
val = proc.targettask.polymorphic_tosave_elements
if self.verbose:
self.buf.write(self._indent() + " +- %s attribute on %s (UOWDependencyProcessor(%d) processing %s)\n" % (
repr(proc.processor.key),
("%s's to be %s" % (self._repr_task_class(proc.targettask), deletes and "deleted" or "saved")),
hex(id(proc)),
self._repr_task(proc.targettask))
)
elif False:
self.buf.write(self._indent() + " +- %s attribute on %s\n" % (
repr(proc.processor.key),
("%s's to be %s" % (self._repr_task_class(proc.targettask), deletes and "deleted" or "saved")),
)
)
if len(val) == 0:
if self.verbose:
self.buf.write(self._indent() + " +- " + "(no objects)\n")
for v in val:
self.buf.write(self._indent() + " +- " + self._repr_task_element(v, proc.processor.key, process=True) + "\n")
def _repr_task_element(self, te, attribute=None, process=False):
if getattr(te, 'state', None) is None:
objid = "(placeholder)"
else:
if attribute is not None:
objid = "%s.%s" % (mapperutil.state_str(te.state), attribute)
else:
objid = mapperutil.state_str(te.state)
if self.verbose:
return "%s (UOWTaskElement(%s, %s))" % (objid, hex(id(te)), (te.listonly and 'listonly' or (te.isdelete and 'delete' or 'save')))
elif process:
return "Process %s" % (objid)
else:
return "%s %s" % ((te.isdelete and "Delete" or "Save"), objid)
def _repr_task(self, task):
if task.mapper is not None:
if task.mapper.__class__.__name__ == 'Mapper':
name = task.mapper.class_.__name__ + "/" + task.mapper.local_table.description + "/" + str(task.mapper.entity_name)
else:
name = repr(task.mapper)
else:
name = '(none)'
sd = getattr(task, '_superduper', False)
if sd:
return ("SD UOWTask(%s, %s)" % (hex(id(task)), name))
else:
return ("UOWTask(%s, %s)" % (hex(id(task)), name))
def _repr_task_class(self, task):
if task.mapper is not None and task.mapper.__class__.__name__ == 'Mapper':
return task.mapper.class_.__name__
else:
return '(none)'
def _indent(self):
return " |" * self.indent
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