MutationMessage_test Class Reference

Description

Test:

properties of a container to transport a diff from an abstracted source generator to an abstracted consumer.

• this covers a standard usage scenario within Lumiera, where some producer in the Session core detects changes in session structure and sends a message to make the UI conform to the new structure
• diff messages are hard to debug and test, since they are designed as opaque sequences to be consumed only once. Thus for we provide a snapshot decorator to offer diagnostic facilities
• moreover we provide a simplified builder function to create hard wired diff messages in a concise way
• and finally this test repeats the scenario of DiffTreeApplication_test, but this time the diff sequences are encapsulated as MutationMessage.

  Remarks

  like all the other diff related tests, this code might be hard to follow, unless you're familiar with the underlying concepts. Basically, a Diff is represented as a linearised sequence of verb tokens. Together these tokens form a diff language. The semantics of that language are oriented towards application of this diff onto a target structure. The goal is to represent structure changes without being bound to a specific data structure implementation. Yet there is one meta data representation used within the diff itself, as well as for various test and demonstration examples: the generic data record together with its variant node element. The key point to note is the (recursive) usage of Record elements as payload within GenNode, which allows to represent tree shaped object like data structures.

  See also

  AbstractTangible_test::mutate() concrete usage scenario for UI-elements

  DiffTreeApplication_test change a tree-like data structure by diff

  DiffComplexApplication_test handling arbitrary data structures

  DiffListApplication_test

  MutationMessage

  ui-bus.hpp

Definition at line 118 of file mutation-message-test.cpp.

Private Member Functions
void	demonstrate_standardUsage ()
void	demonstrate_treeApplication ()
MutationMessage	mutationDiff ()
MutationMessage	populationDiff ()
virtual void	run (Arg)
void	verify_builder ()
void	verify_diagnostics ()
Private Member Functions inherited from TreeDiffLanguage
	DiffStep_CTOR (ins)
	DiffStep_CTOR (del)
	DiffStep_CTOR (pick)
	DiffStep_CTOR (find)
	DiffStep_CTOR (skip)
	DiffStep_CTOR (after)
	DiffStep_CTOR (set)
	DiffStep_CTOR (mut)
	DiffStep_CTOR (emu)

Additional Inherited Members
Private Types inherited from TreeDiffLanguage
using	Interpreter = TreeDiffInterpreter
Private Types inherited from DiffLanguage< TreeDiffInterpreter, GenNode >
using	DiffToken = std::tuple< DiffVerb, GenNode >
using	DiffVerb = VerbToken< TreeDiffInterpreter, void(GenNode const &)>
using	Interpreter = TreeDiffInterpreter
Static Private Attributes inherited from DiffLanguage< TreeDiffInterpreter, GenNode >
static const DiffStep	NIL
	fixed "invalid" marker token More...

Member Function Documentation

demonstrate_standardUsage()

void demonstrate_standardUsage ( )

inlineprivate

Test:

demonstrate the intended usage pattern

• a diff generation context is allocated
• the MutationMessage takes ownership
• and exposes the generated diff sequence
• which is pulled during iteration

Definition at line 140 of file mutation-message-test.cpp.

demonstrate_treeApplication()

void demonstrate_treeApplication ( )

inlineprivate

Test:

use MutationMessage to transport and apply changes to target data

Remarks

this almost literally repeats the DiffTreeApplication_test

Definition at line 388 of file mutation-message-test.cpp.

Inheritance diagram for MutationMessage_test:

Collaboration diagram for MutationMessage_test:

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The documentation for this class was generated from the following file:

• mutation-message-test.cpp