#include <userver/ugrpc/protobuf_visit.hpp>

Detailed Description

Collects knowledge of the structure of the protobuf messages allowing for efficient loops over fields to apply a callback to the ones selected by the 'selector' function.

If you do not have static knowledge of the required fields, you should use VisitFields or VisitFieldsRecursive that are equivalent to FieldsVisitor with a return true; selector.

Warning: You should not construct this at runtime as it performs significant computations in the constructor to precompile the visitors. You should create this ones at start-up.

Example usage:

Definition at line 243 of file protobuf_visit.hpp.

Inheritance diagram for ugrpc::FieldsVisitor:

Public Types
using	Selector = utils::function_ref<bool(const google::protobuf::FieldDescriptor& field)>

enum class	LockBehavior { kNone = 0 , kShared = 1 }

Public Member Functions
	FieldsVisitor (Selector selector)
	Creates the visitor with the given selector and compiles it for the message types we can find.

	FieldsVisitor (Selector selector, const DescriptorList &descriptors)
	Creates the visitor with the given selector and compiles it for the given message types and their fields recursively.

	FieldsVisitor (Selector selector, LockBehavior lock_behavior)
	Creates the visitor with custom thread locking behavior and the given selector for runtime compilation.

	FieldsVisitor (Selector selector, const DescriptorList &descriptors, LockBehavior lock_behavior)
	Creates the visitor with custom thread locking behavior and the given selector; compiles it for the given message types.

void	Visit (google::protobuf::Message &message, FieldVisitCallback callback)
	Execute a callback without recursion.

void	VisitRecursive (google::protobuf::Message &message, FieldVisitCallback callback)
	Execute a callback recursively.

void	Compile (const google::protobuf::Descriptor *descriptor)
	Compiles the visitor for the given message type and its dependent types.

void	Compile (const DescriptorList &descriptors)
	Compiles the visitor for the given message types and their dependent types.

void	CompileAllGenerated ()
	Compiles the visitor for all message types we can find. Not guaranteed to find all message types.

void	CompileGenerated (std::string_view message_name)
	Compiles the visitor for the given generated message type and its dependent types.

void	CompileGenerated (utils::span< std::string_view > message_names)
	Compiles the visitor for the given generated message type and their dependent types.

bool	ContainsSelected (const google::protobuf::Descriptor *descriptor)
	Efficiently checks if the message contains any selected structures.

Member Typedef Documentation

◆ Selector

using ugrpc::FieldsVisitor::Selector = utils::function_ref<bool(const google::protobuf::FieldDescriptor& field)>

Definition at line 245 of file protobuf_visit.hpp.

Member Enumeration Documentation

◆ LockBehavior

enum class ugrpc::VisitorCompiler::LockBehavior

stronginherited

Enumerator
kNone	Do not take shared_mutex locks for any operation on the visitor.
kShared	Take shared_lock for all read operations on the visitor and unique_lock for all Compile operations.

Definition at line 72 of file protobuf_visit.hpp.

Constructor & Destructor Documentation

◆ FieldsVisitor() [1/2]

ugrpc::FieldsVisitor::FieldsVisitor	(	Selector	selector,
		LockBehavior	lock_behavior )

Creates the visitor with custom thread locking behavior and the given selector for runtime compilation.

Warning: Do not use this unless you know what you are doing.

◆ FieldsVisitor() [2/2]

ugrpc::FieldsVisitor::FieldsVisitor	(	Selector	selector,
		const DescriptorList &	descriptors,
		LockBehavior	lock_behavior )

Creates the visitor with custom thread locking behavior and the given selector; compiles it for the given message types.

Warning: Do not use this unless you know what you are doing.

Member Function Documentation

◆ ContainsSelected()

bool ugrpc::VisitorCompiler::ContainsSelected ( const google::protobuf::Descriptor * descriptor )

inherited

Efficiently checks if the message contains any selected structures.

You may want to call this before Visit and VisitRecursive to avoid a copy of the message beforehand if you require one.

◆ Visit()

void ugrpc::BaseVisitor< FieldVisitCallback >::Visit	(	google::protobuf::Message &	message,
		FieldVisitCallback	callback )

inlineinherited

Execute a callback without recursion.

Equivalent to VisitFields but utilizes the precompilation data from Compile

Definition at line 178 of file protobuf_visit.hpp.

◆ VisitRecursive()

void ugrpc::BaseVisitor< FieldVisitCallback >::VisitRecursive	(	google::protobuf::Message &	message,
		FieldVisitCallback	callback )

inlineinherited

Execute a callback recursively.

Equivalent to VisitFieldsRecursive and VisitMessagesRecursive but utilizes the precompilation data from Compile

Definition at line 190 of file protobuf_visit.hpp.

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

userver/ugrpc/protobuf_visit.hpp