QueryDependencyManager class

Manages parent-child relationships between queries.

Enables cascading cancellation when a parent query is disposed, automatically cancelling in-flight fetch operations of dependent queries.

Example:

final manager = QueryDependencyManager();
manager.registerDependency('user:123:posts', 'user:123');
manager.registerDependency('user:123:followers', 'user:123');

// When 'user:123' is disposed:
manager.notifyParentDisposed('user:123', (childKey) {
  print('Cancelling: $childKey');
});
// Output: Cancelling: user:123:posts
//         Cancelling: user:123:followers

Constructors

QueryDependencyManager()

Properties

hashCode → int

The hash code for this object.

no setter, inherited

relationshipCount → int

Returns the total number of registered relationships.

no setter

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

clear() → void

Clears all registered relationships.

getAllDescendants(String parentKey) → Set<String>

Returns all descendant keys (children, grandchildren, etc.) for a parent.

getChildren(String parentKey) → Set<String>

Returns all direct child keys for a given parent.

getParent(String childKey) → String?

Returns the parent key for a given child, or null if no parent.

hasChildren(String parentKey) → bool

Checks whether a query has any registered dependents.

hasParent(String childKey) → bool

Checks whether a query has a parent dependency.

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

notifyAllDescendantsDisposed(String parentKey, void onDescendant(String)) → void

Notifies all descendant queries (deep) when a parent is disposed.

notifyParentDisposed(String parentKey, void onChild(String)) → void

Notifies all direct child queries when a parent is disposed.

registerDependency(String childKey, String parentKey) → void

Registers a dependency relationship between a child and parent query.

toString() → String

A string representation of this object.

inherited

unregister(String key) → void

Unregisters a query from all dependency relationships.

Operators

operator ==(Object other) → bool

The equality operator.

inherited