/*
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* Copyright 2014 Google Inc. All rights reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "request_dispatcher.h"
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#include "bar_handler.h"
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#include "foo_handler.h"
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#include <iostream>
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using namespace std;
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using namespace fruit;
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class RequestDispatcherImpl : public RequestDispatcher {
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private:
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const Request& request;
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// We hold providers here for lazy injection; we only want to inject the handler that is actually used for the
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// request.
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// In a large system, there will be many handlers, and many will have lots of dependencies that also have to be
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// injected.
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Provider<FooHandler> fooHandler;
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Provider<BarHandler> barHandler;
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public:
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INJECT(RequestDispatcherImpl(const Request& request, Provider<FooHandler> fooHandler,
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Provider<BarHandler> barHandler))
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: request(request), fooHandler(fooHandler), barHandler(barHandler) {}
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void handleRequest() override {
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if (stringStartsWith(request.path, "/foo/")) {
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fooHandler.get()->handleRequest();
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} else if (stringStartsWith(request.path, "/bar/")) {
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barHandler.get()->handleRequest();
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} else {
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cerr << "Error: no handler found for request path: '" << request.path << "' , ignoring request." << endl;
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}
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}
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private:
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static bool stringStartsWith(const string& s, const string& candidatePrefix) {
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return s.compare(0, candidatePrefix.size(), candidatePrefix) == 0;
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}
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};
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Component<Required<Request, ServerContext>, RequestDispatcher> getRequestDispatcherComponent() {
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return createComponent()
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.bind<RequestDispatcher, RequestDispatcherImpl>()
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.install(getFooHandlerComponent)
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.install(getBarHandlerComponent);
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}
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