You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
52 lines
1.6 KiB
52 lines
1.6 KiB
/*
|
|
* Copyright 2014 Google Inc. All rights reserved.
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
#include "cached_greeter.h"
|
|
#include "key_value_storage.h"
|
|
|
|
class CachedGreeterImpl : public Greeter {
|
|
private:
|
|
Greeter* greeter;
|
|
KeyValueStorage* keyValueStorage;
|
|
|
|
public:
|
|
INJECT(CachedGreeterImpl(Greeter* greeter, KeyValueStorage* keyValueStorage))
|
|
: greeter(greeter), keyValueStorage(keyValueStorage) {
|
|
}
|
|
|
|
std::string greet() override {
|
|
std::string greeting = keyValueStorage->get("greeting");
|
|
if (!greeting.empty()) {
|
|
return greeting;
|
|
}
|
|
|
|
// Not in the cache, we need to compute the greeting.
|
|
greeting = greeter->greet();
|
|
|
|
// We also add it in the cache so that later calls don't need to call greeter->greet().
|
|
keyValueStorage->put("greeting", greeting);
|
|
|
|
return greeting;
|
|
}
|
|
};
|
|
|
|
fruit::Component<fruit::Annotated<Cached, Greeter>> getCachedGreeterComponent() {
|
|
return fruit::createComponent()
|
|
.bind<fruit::Annotated<Cached, Greeter>, CachedGreeterImpl>()
|
|
.install(getKeyValueStorageComponent)
|
|
.install(getGreeterComponent);
|
|
}
|