cache_key_prepender.h

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/*
 * Copyright 2016 Google Inc.
 *
 * 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.
 */


#ifndef PAGESPEED_KERNEL_CACHE_CACHE_KEY_PREPENDER_H_
#define PAGESPEED_KERNEL_CACHE_CACHE_KEY_PREPENDER_H_

#include "pagespeed/kernel/base/basictypes.h"
#include "pagespeed/kernel/base/shared_string.h"
#include "pagespeed/kernel/base/string.h"
#include "pagespeed/kernel/base/string_util.h"
#include "pagespeed/kernel/cache/cache_interface.h"

namespace net_instaweb {

class CacheKeyPrepender : public CacheInterface {
 public:
  CacheKeyPrepender(StringPiece prefix, CacheInterface* cache);
  ~CacheKeyPrepender() override {}

  void Get(const GoogleString& key, Callback* callback) override;
  void MultiGet(MultiGetRequest* request) override;
  void Put(const GoogleString& key, const SharedString& value) override;
  void Delete(const GoogleString& key) override;
  CacheInterface* Backend() override { return cache_; }
  bool IsBlocking() const override { return cache_->IsBlocking(); }

  bool IsHealthy() const override { return cache_->IsHealthy(); }
  void ShutDown() override { cache_->ShutDown(); }
  GoogleString Name() const override {
    return FormatName(prefix_.Value(), cache_->Name());
  }

  static GoogleString FormatName(StringPiece prefix, StringPiece cache);

 private:
  class KeyPrependerCallback;

  CacheInterface* cache_;
  SharedString prefix_; 

  GoogleString AddPrefix(const GoogleString &key);

  
};

}  

#endif