wangle::ServiceFilter< ReqA, RespA, ReqB, RespB > Class Template Reference

#include <Service.h>

Inheritance diagram for wangle::ServiceFilter< ReqA, RespA, ReqB, RespB >:

Public Member Functions
	ServiceFilter (std::shared_ptr< Service< ReqB, RespB >> service)
	~ServiceFilter () override=default
folly::Future< folly::Unit >	close () override
bool	isAvailable () override
Public Member Functions inherited from wangle::Service< ReqA, RespA >
virtual folly::Future< RespA >	operator() (ReqArequest)=0
virtual	~Service ()=default

Protected Attributes
std::shared_ptr< Service< ReqB, RespB > >	service_

Detailed Description

template<typename ReqA, typename RespA, typename ReqB = ReqA, typename RespB = RespA>
class wangle::ServiceFilter< ReqA, RespA, ReqB, RespB >

A Filter acts as a decorator/transformer of a service. It may apply transformations to the input and output of that service:

     class MyService

ReqA -> | | -> ReqB | <- RespB RespA <- |

For example, you may have a service that takes Strings and parses them as Ints. If you want to expose this as a Network Service via Thrift, it is nice to isolate the protocol handling from the business rules. Hence you might have a Filter that converts back and forth between Thrift structs:

[ThriftIn -> (String -> Int) -> ThriftOut]

Definition at line 67 of file Service.h.

Constructor & Destructor Documentation

template<typename ReqA, typename RespA, typename ReqB = ReqA, typename RespB = RespA>

wangle::ServiceFilter< ReqA, RespA, ReqB, RespB >::ServiceFilter ( std::shared_ptr< Service< ReqB, RespB >>  service )

inlineexplicit

Definition at line 69 of file Service.h.

      : service_(service) {}

template<typename ReqA, typename RespA, typename ReqB = ReqA, typename RespB = RespA>

wangle::ServiceFilter< ReqA, RespA, ReqB, RespB >::~ServiceFilter ( )

overridedefault

Member Function Documentation

template<typename ReqA, typename RespA, typename ReqB = ReqA, typename RespB = RespA>

folly::Future<folly::Unit> wangle::ServiceFilter< ReqA, RespA, ReqB, RespB >::close ( )

inlineoverridevirtual

Reimplemented from wangle::Service< ReqA, RespA >.

Definition at line 73 of file Service.h.

                                          {
    return service_->close();
  }

template<typename ReqA, typename RespA, typename ReqB = ReqA, typename RespB = RespA>

bool wangle::ServiceFilter< ReqA, RespA, ReqB, RespB >::isAvailable ( )

inlineoverridevirtual

Reimplemented from wangle::Service< ReqA, RespA >.

Definition at line 77 of file Service.h.

                              {
    return service_->isAvailable();
  }

Member Data Documentation

template<typename ReqA, typename RespA, typename ReqB = ReqA, typename RespB = RespA>

std::shared_ptr<Service<ReqB, RespB> > wangle::ServiceFilter< ReqA, RespA, ReqB, RespB >::service_

protected

Definition at line 82 of file Service.h.

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

• proxygen/wangle/wangle/service/Service.h