Mercurial > hg > orthanc-stone
view Framework/Messages/MessageForwarder.h @ 429:c7fb700a7d12 am-vsol-upgrade
cleanup
author | am@osimis.io |
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date | Wed, 28 Nov 2018 10:46:32 +0100 |
parents | 751fb354149e |
children | a750f11892ec |
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/** * Stone of Orthanc * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics * Department, University Hospital of Liege, Belgium * Copyright (C) 2017-2018 Osimis S.A., Belgium * * This program is free software: you can redistribute it and/or * modify it under the terms of the GNU Affero General Public License * as published by the Free Software Foundation, either version 3 of * the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Affero General Public License for more details. * * You should have received a copy of the GNU Affero General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. **/ #pragma once #include "ICallable.h" #include "IObserver.h" #include <boost/noncopyable.hpp> namespace OrthancStone { class IObservable; class IMessageForwarder : public IObserver { IObservable& emitter_; public: IMessageForwarder(MessageBroker& broker, IObservable& emitter) : IObserver(broker), emitter_(emitter) {} virtual ~IMessageForwarder() {} protected: void ForwardMessageInternal(const IMessage& message); void RegisterForwarderInEmitter(); }; /* When an Observer (B) simply needs to re-emit a message it has received, instead of implementing * a specific member function to forward the message, it can create a MessageForwarder. * The MessageForwarder will re-emit the message "in the name of (B)" * * Consider the chain where * A is an observable * | * B is an observer of A and observable * | * C is an observer of B and knows that B is re-emitting many messages from A * * instead of implementing a callback, B will create a MessageForwarder that will emit the messages in his name: * A.RegisterObserverCallback(new MessageForwarder<A::MessageType>(broker, *this) // where "this" is B * * in C: * B.RegisterObserverCallback(new Callable<C, A:MessageTyper>(*this, &B::MyCallback)) // where "this" is C */ template<typename TMessage> class MessageForwarder : public IMessageForwarder, public Callable<MessageForwarder<TMessage>, TMessage> { public: MessageForwarder(MessageBroker& broker, IObservable& emitter // the object that will emit the messages to forward ) : IMessageForwarder(broker, emitter), Callable<MessageForwarder<TMessage>, TMessage>(*this, &MessageForwarder::ForwardMessage) { RegisterForwarderInEmitter(); } protected: void ForwardMessage(const TMessage& message) { ForwardMessageInternal(message); } }; }