ResponsibilityChain<R> class

A class providing the functionality for chaining responsibility handler nodes together and controlling the responsibility distribution between the linked nodes. The orElse function returns the value that should be returned when none of the responsibility handlers succeed to return the result.

Nodes of responsibility are lazily created and executed in the precise order in which they are chained.

The type parameter R represents the type of the result returned by the chain.

• The chain method adds a responsibility node to the end of this chain;
• The handle method returns the Future of R and lets the chained handle nodes successively try to return the value. If none of the handlers succeed, the result of orElse will be returned.

Inheritance

• Object
• ResponsibilityChainWithArgs<R, void>
• ResponsibilityChain

Constructors

ResponsibilityChain({required ParametrizedSupplier<R, void> orElse})

Properties

hashCode → int

The hash code for this object.

no setter, inherited

nodes → List<IResponsibilityNode<R, void>>

The list of nodes that are currently chained to this responsibility chain.

final, inherited

orElse → ParametrizedSupplier<R, void>

The function that returns the default value of type R.

final, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

chain(IResponsibilityNode<R, void> node) → void

Adds a given node to this chain.

inherited

handle([void args]) → Future<R>

This method iterates through the chained nodes in the precise order they had been chained and calls the IResponsibilityNodes with the argument arg.

override

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited