easy::DependenciesComponent< Dependencies > Class Template Reference

#include <userver/easy.hpp>

Detailed Description

template<class Dependencies>
class easy::DependenciesComponent< Dependencies >

Factory component for the dependencies from easy library.

This component can be registered in the component list and used by any client. For example:

using Deps = easy::Dependencies<ActionDep, easy::PgDep>;
using DepsComponent = easy::DependenciesComponent<Deps>;
 
class MyHandler final : public server::handlers::HttpHandlerBase {
public:
    MyHandler(const components::ComponentConfig& config, const components::ComponentContext& component_context)
        : HttpHandlerBase(config, component_context),
          deps_(component_context.FindComponent<DepsComponent>().GetDependencies()) {}
 
    std::string HandleRequestThrow(const server::http::HttpRequest& request, server::request::RequestContext&)
        const override {
        const auto& action = request.GetArg("action");
        deps_.pg().Execute(
            storages::postgres::ClusterHostType::kMaster, "INSERT INTO events_table(action) VALUES($1)", action
        );
        return deps_.CreateActionRequest(action)->body();
    }
 
private:
    const Deps deps_;
};
 
int main(int argc, char* argv[]) {
    auto component_list = components::MinimalServerComponentList()
                              .Append<components::TestsuiteSupport>()
                              .Append<components::HttpClient>()
                              .Append<clients::dns::Component>()
                              .Append<ActionClient>()
                              .Append<DepsComponent>()
                              .Append<components::Postgres>("postgres")
                              .Append<MyHandler>("/log-POST");
 
    return utils::DaemonMain(argc, argv, component_list);
}

Definition at line 44 of file easy.hpp.

Inheritance diagram for easy::DependenciesComponent< Dependencies >:

Public Member Functions
	DependenciesComponent (const components::ComponentConfig &config, const components::ComponentContext &context)
Dependencies	GetDependencies () const
ComponentHealth	GetComponentHealth () const override
void	OnLoadingCancelled () override
void	OnAllComponentsLoaded () override
void	OnAllComponentsAreStopping () override

Static Public Member Functions
static yaml_config::Schema	GetStaticConfigSchema ()

Static Public Attributes
static constexpr std::string_view	kName = "easy-dependencies"
	The default name of easy::DependenciesComponent.

Protected Types
using	LoggableComponentBase = ComponentBase
	Legacy alias, use ComponentBase instead.

Member Typedef Documentation

LoggableComponentBase

using components::ComponentBase::LoggableComponentBase = ComponentBase

protectedinherited

Legacy alias, use ComponentBase instead.

Definition at line 67 of file component_base.hpp.

Constructor & Destructor Documentation

DependenciesComponent()

template<class Dependencies >

easy::DependenciesComponent< Dependencies >::DependenciesComponent ( const components::ComponentConfig & config, const components::ComponentContext & context )

inline

Definition at line 50 of file easy.hpp.

Member Function Documentation

GetComponentHealth()

ComponentHealth components::ComponentBase::GetComponentHealth ( ) const

inlineoverridevirtualinherited

Override this function to inform the world of the state of your component.

Warning

The function is called concurrently from multiple threads.

Reimplemented from components::RawComponentBase.

Reimplemented in server::handlers::Restart.

Definition at line 35 of file component_base.hpp.

GetDependencies()

template<class Dependencies >

Dependencies easy::DependenciesComponent< Dependencies >::GetDependencies ( ) const

inline

Definition at line 53 of file easy.hpp.

GetStaticConfigSchema()

static yaml_config::Schema components::ComponentBase::GetStaticConfigSchema ( )

staticinherited

If the component pulls more options from ComponentConfig than its parent component, then it needs to define GetStaticConfigSchema method and add its own options to the parent component's options.

OnAllComponentsAreStopping()

void components::ComponentBase::OnAllComponentsAreStopping ( )

inlineoverridevirtualinherited

Component may use this function to stop doing work before the stop of the components that depend on it.

Base components may override it and make final to do some work before the derived object constructor is called. Don't use it otherwise.

Reimplemented from components::RawComponentBase.

Reimplemented in urabbitmq::ConsumerComponentBase, and components::Server.

Definition at line 58 of file component_base.hpp.

OnAllComponentsLoaded()

void components::ComponentBase::OnAllComponentsLoaded ( )

inlineoverridevirtualinherited

Component may use this function to finalize registration of other components that depend on it (for example, handler components register in server component, and the latter uses OnAllComponentsLoaded() to start processing requests).

Base components may override it and make final to do some work after the derived object constructor is called. Don't use it otherwise.

Reimplemented from components::RawComponentBase.

Reimplemented in urabbitmq::ConsumerComponentBase, components::Server, and server::handlers::Ping.

Definition at line 51 of file component_base.hpp.

OnLoadingCancelled()

void components::ComponentBase::OnLoadingCancelled ( )

inlineoverridevirtualinherited

Called once if the creation of any other component failed. If the current component expects some other component to take any action with the current component, this call is a signal that such action may never happen due to components loading was cancelled. Application components might not want to override it.

Reimplemented from components::RawComponentBase.

Definition at line 42 of file component_base.hpp.

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

• userver/easy.hpp