ZoneSpecification class Null safety

A parameter object with custom zone function handlers for Zone.fork.

A zone specification is a parameter object passed to Zone.fork and any underlying ForkHandler custom implementations. The individual handlers, if set to a non-null value, will be the implementation of the corresponding Zone methods for a forked zone created using this zone specification.

Handlers have the same signature as the same-named methods on Zone, but receive three additional arguments:

  1. The zone the handlers are attached to (the "self" zone). This is the zone created by Zone.fork where the handler is passed as part of the zone delegation.
  2. A ZoneDelegate to the parent zone.
  3. The "current" zone at the time the request was made. The self zone is always a parent zone of the current zone.

Handlers can either stop propagating the request (by simply not calling the parent handler), or forward to the parent zone, potentially modifying the arguments on the way.

Constructors

ZoneSpecification({HandleUncaughtErrorHandler? handleUncaughtError, RunHandler? run, RunUnaryHandler? runUnary, RunBinaryHandler? runBinary, RegisterCallbackHandler? registerCallback, RegisterUnaryCallbackHandler? registerUnaryCallback, RegisterBinaryCallbackHandler? registerBinaryCallback, ErrorCallbackHandler? errorCallback, ScheduleMicrotaskHandler? scheduleMicrotask, CreateTimerHandler? createTimer, CreatePeriodicTimerHandler? createPeriodicTimer, PrintHandler? print, ForkHandler? fork})
Creates a specification with the provided handlers. [...]
const
factory
ZoneSpecification.from(ZoneSpecification other, {HandleUncaughtErrorHandler? handleUncaughtError, RunHandler? run, RunUnaryHandler? runUnary, RunBinaryHandler? runBinary, RegisterCallbackHandler? registerCallback, RegisterUnaryCallbackHandler? registerUnaryCallback, RegisterBinaryCallbackHandler? registerBinaryCallback, ErrorCallbackHandler? errorCallback, ScheduleMicrotaskHandler? scheduleMicrotask, CreateTimerHandler? createTimer, CreatePeriodicTimerHandler? createPeriodicTimer, PrintHandler? print, ForkHandler? fork})
Creates a specification from other and provided handlers. [...]
factory

Properties

createPeriodicTimer CreatePeriodicTimerHandler?
A custom Zone.createPeriodicTimer implementation for a new zone.
read-only
createTimer CreateTimerHandler?
A custom Zone.createTimer implementation for a new zone.
read-only
errorCallback ErrorCallbackHandler?
A custom Zone.errorCallback implementation for a new zone.
read-only
fork ForkHandler?
A custom Zone.handleUncaughtError implementation for a new zone.
read-only
handleUncaughtError HandleUncaughtErrorHandler?
A custom Zone.handleUncaughtError implementation for a new zone.
read-only
hashCode int
The hash code for this object. [...]
read-only, inherited
print PrintHandler?
A custom Zone.print implementation for a new zone.
read-only
registerBinaryCallback RegisterBinaryCallbackHandler?
A custom Zone.registerBinaryCallback implementation for a new zone.
read-only
registerCallback RegisterCallbackHandler?
A custom Zone.registerCallback implementation for a new zone.
read-only
registerUnaryCallback RegisterUnaryCallbackHandler?
A custom Zone.registerUnaryCallback implementation for a new zone.
read-only
run RunHandler?
A custom Zone.run implementation for a new zone.
read-only
runBinary RunBinaryHandler?
A custom Zone.runBinary implementation for a new zone.
read-only
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited
runUnary RunUnaryHandler?
A custom Zone.runUnary implementation for a new zone.
read-only
scheduleMicrotask ScheduleMicrotaskHandler?
A custom Zone.scheduleMicrotask implementation for a new zone.
read-only

Methods

noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed. [...]
inherited
toString() String
A string representation of this object. [...]
inherited

Operators

operator ==(Object other) bool
The equality operator. [...]
inherited