delay_cache.h

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/*
 * Copyright 2012 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_DELAY_CACHE_H_
#define PAGESPEED_KERNEL_CACHE_DELAY_CACHE_H_

#include <map>

#include "pagespeed/kernel/base/abstract_mutex.h"
#include "pagespeed/kernel/base/basictypes.h"
#include "pagespeed/kernel/base/scoped_ptr.h"
#include "pagespeed/kernel/base/shared_string.h"
#include "pagespeed/kernel/base/string.h"
#include "pagespeed/kernel/base/string_util.h"
#include "pagespeed/kernel/base/thread_system.h"
#include "pagespeed/kernel/cache/cache_interface.h"
#include "pagespeed/kernel/thread/queued_worker_pool.h"

namespace net_instaweb {

class DelayCache : public CacheInterface {
 public:
  DelayCache(CacheInterface* cache, ThreadSystem* thread_system);
  virtual ~DelayCache();

  virtual void Get(const GoogleString& key, Callback* callback);
  virtual void Put(const GoogleString& key, const SharedString& value);
  virtual void Delete(const GoogleString& key);
  virtual void MultiGet(MultiGetRequest* request);

  void DelayKey(const GoogleString& key);

  void ReleaseKey(const GoogleString& key) { ReleaseKeyInSequence(key, NULL); }

  void ReleaseKeyInSequence(const GoogleString& key,
                            QueuedWorkerPool::Sequence* sequence);

  static GoogleString FormatName(StringPiece name);
  virtual GoogleString Name() const { return FormatName(cache_->Name()); }

  virtual bool IsBlocking() const { return false; }
  virtual bool IsHealthy() const { return cache_->IsHealthy(); }
  virtual void ShutDown() { cache_->ShutDown(); }

 private:
  class DelayCallback;
  friend class DelayCallback;

  void LookupComplete(DelayCallback* callback);

  typedef std::map<GoogleString, DelayCallback*> DelayMap;

  CacheInterface* cache_;
  scoped_ptr<AbstractMutex> mutex_;
  StringSet delay_requests_;
  DelayMap delay_map_;

  
};

}  

#endif