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qom: add a generic mechanism to resolve paths

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It may be desirable to have custom link<> properties that do more
than just store an object.  Even the addition of a "check"
function is not enough if setting the link has side effects
or if a non-standard reference counting is preferrable.

Avoid the assumption that the opaque field of a link<> is a
LinkProperty struct, by adding a generic "resolve" callback
to ObjectProperty.  This fixes aliases of link properties.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2014-06-05 13:11:51 +02:00
parent ef7c7ff6d4
commit 64607d0881
2 changed files with 82 additions and 34 deletions
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34
include/qom/object.h
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@ -303,6 +303,25 @@ typedef void (ObjectPropertyAccessor)(Object *obj,
const char *name,
Error **errp);
/**
* ObjectPropertyResolve:
* @obj: the object that owns the property
* @opaque: the opaque registered with the property
* @part: the name of the property
*
* Resolves the #Object corresponding to property @part.
*
* The returned object can also be used as a starting point
* to resolve a relative path starting with "@part".
*
* Returns: If @path is the path that led to @obj, the function
* returns the #Object corresponding to "@path/@part".
* If "@path/@part" is not a valid object path, it returns #NULL.
*/
typedef Object *(ObjectPropertyResolve)(Object *obj,
void *opaque,
const char *part);
/**
* ObjectPropertyRelease:
* @obj: the object that owns the property
@ -321,6 +340,7 @@ typedef struct ObjectProperty
gchar *type;
ObjectPropertyAccessor *get;
ObjectPropertyAccessor *set;
ObjectPropertyResolve *resolve;
ObjectPropertyRelease *release;
void *opaque;
@ -787,12 +807,16 @@ void object_unref(Object *obj);
* destruction. This may be NULL.
* @opaque: an opaque pointer to pass to the callbacks for the property
* @errp: returns an error if this function fails
*
* Returns: The #ObjectProperty; this can be used to set the @resolve
* callback for child and link properties.
*/
void object_property_add(Object *obj, const char *name, const char *type,
ObjectPropertyAccessor *get,
ObjectPropertyAccessor *set,
ObjectPropertyRelease *release,
void *opaque, Error **errp);
ObjectProperty *object_property_add(Object *obj, const char *name,
const char *type,
ObjectPropertyAccessor *get,
ObjectPropertyAccessor *set,
ObjectPropertyRelease *release,
void *opaque, Error **errp);
void object_property_del(Object *obj, const char *name, Error **errp);