Author: dmeyer
Date: Mon Apr 9 18:09:56 2007
New Revision: 9423
Added:
trunk/core/src/resources.py
- copied, changed from r9421, /trunk/ui/src/application/resources.py
Removed:
trunk/ui/src/application/resources.py
Modified:
trunk/ui/src/application/__init__.py
trunk/ui/src/application/base.py
Log:
Move resource handling to Freevo core and make it a class
Patch by Mathias Weber
Copied: trunk/core/src/resources.py (from r9421,
/trunk/ui/src/application/resources.py)
==============================================================================
--- /trunk/ui/src/application/resources.py (original)
+++ trunk/core/src/resources.py Mon Apr 9 18:09:56 2007
@@ -29,32 +29,104 @@
#
# -----------------------------------------------------------------------------
+# kaa imports
+from kaa.notifier import InProgress, Callback, yield_execution
+
_resources = {}
-def get_resources(instance, *resources):
+class ResourceHandler(object):
"""
- Reserve a list of resources. If one or more resources can not be
- reserved, the whole operation fails. The function will return the
- list of failed resources with the instance having this resource.
+ The ResourceHandler inherit from it if you want to use resources that need
+ a specific access rights.
"""
- blocked = {}
- for r in resources:
- if r in _resources:
- blocked[r] = _resources[r]
- if blocked:
- # failed to reserve
- return blocked
- # reserve all resources
- for r in resources:
- _resources[r] = instance
- return {}
+ suspended_handler = []
+ def get_resources(self, *resources):
+ """
+ Reserve a list of resources. If one or more resources can not be
+ reserved, the whole operation fails. The function will return the
+ list of failed resources with this instance having this resource.
+ """
+ blocked = {}
+ for r in resources:
+ if r in _resources:
+ if _resources[r].can_suspend():
+ blocked[r] = _resources[r]
+ else:
+ return False
+ if blocked:
+ # failed to reserve
+ return blocked
+ # reserve all resources
+ for r in resources:
+ _resources[r] = self
+ return {}
+
+
+ def free_resources(self, *resources):
+ """
+ Free all resources blocked by this instance. If no resources are
+ provided, free all resources.
+ """
+ for res, app in _resources.items()[:]:
+ if app == self and (not resources or res in resources):
+ del _resources[res]
+
+
+ def _handler_suspended(self, t, blocked, callback):
+ """
+ Callback for handler that need some more time to release a resource.
+ """
+ for resource in blocked.keys():
+ if resource in _resources:
+ # not yet all resources are free yet
+ return
+
+ # all resource are free now call the handler
+ callback()
+
+
+ @yield_execution()
+ def suspend_all(self, blocked):
+ """
+ Suspend all handler that block a resource if done call the callback
+ method.
+ """
+ for handler in blocked:
+ self.suspended_handler.append(blocked[handler])
+ answer = blocked[handler].suspend()
+ if isinstance(answer, InProgress):
+ yield answer
+
+
+ def resume_all(self):
+ """
+ Resume all handler suspended by this handler. Clear list at the end.
+ """
+ # resume suspended handlers
+ for handler in self.suspended_handler:
+ handler.resume()
+ # clear list with suspended handler since all resumed
+ self.suspended_handler = []
+
+
+ def can_suspend(self):
+ """
+ Return if it is possible for this handler to release its resource.
+ """
+ return False
+
+
+ def suspend(self):
+ """
+ Suspend this resource handler. Should free all the resources.
+ """
+ return False
+
+
+ def resume(self):
+ """
+ Resume the plugin acquire all the resources again.
+ """
+ pass
-def free_resources(instance, *resources):
- """
- Free all resources blocked by the instance. If not resources are
- provided, free all resources.
- """
- for res, app in _resources.items()[:]:
- if app == instance and (not resources or res in resources):
- del _resources[res]
Modified: trunk/ui/src/application/__init__.py
==============================================================================
--- trunk/ui/src/application/__init__.py (original)
+++ trunk/ui/src/application/__init__.py Mon Apr 9 18:09:56 2007
@@ -29,7 +29,6 @@
#
# -----------------------------------------------------------------------------
-from resources import get_resources, free_resources
from base import Application, STATUS_RUNNING, STATUS_STOPPING, \
STATUS_STOPPED, STATUS_IDLE, CAPABILITY_TOGGLE, CAPABILITY_PAUSE, \
CAPABILITY_FULLSCREEN
Modified: trunk/ui/src/application/base.py
==============================================================================
--- trunk/ui/src/application/base.py (original)
+++ trunk/ui/src/application/base.py Mon Apr 9 18:09:56 2007
@@ -38,11 +38,11 @@
from kaa.notifier import Signal
# freevo imports
+from freevo.resources import ResourceHandler
from freevo.ui import gui
# application imports
from handler import handler
-from resources import get_resources, free_resources
# get logging object
log = logging.getLogger()
@@ -56,7 +56,7 @@
CAPABILITY_PAUSE = 2
CAPABILITY_FULLSCREEN = 4
-class Application(object):
+class Application(ResourceHandler):
"""
A basic application
"""
@@ -104,6 +104,7 @@
self.signals['start'].emit()
elif status == STATUS_IDLE:
handler.hide_application(self)
+ self.resume_all()
self._status = status
self.signals['stop'].emit()
else:
@@ -178,23 +179,6 @@
return self.__name
- def get_resources(self, *resources):
- """
- Reserve a list of resources. If one or more resources can not be
- reserved, the whole operation fails. The function will return the
- list of failed resources with the application having this resource.
- """
- return get_resources(self, *resources)
-
-
- def free_resources(self, *resources):
- """
- Free all resources blocked by this application. If not resources are
- provided, free all resources.
- """
- return free_resources(self, *resources)
-
-
def __repr__(self):
"""
String for debugging.
-------------------------------------------------------------------------
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