Page Speed Optimization Libraries  1.5.27.2
net/instaweb/util/public/cache_batcher.h
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00001 /*
00002  * Copyright 2012 Google Inc.
00003  *
00004  * Licensed under the Apache License, Version 2.0 (the "License");
00005  * you may not use this file except in compliance with the License.
00006  * You may obtain a copy of the License at
00007  *
00008  *      http:///www.apache.org/licenses/LICENSE-2.0
00009  *
00010  * Unless required by applicable law or agreed to in writing, software
00011  * distributed under the License is distributed on an "AS IS" BASIS,
00012  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  * See the License for the specific language governing permissions and
00014  * limitations under the License.
00015  */
00016 
00018 
00019 #ifndef NET_INSTAWEB_UTIL_PUBLIC_CACHE_BATCHER_H_
00020 #define NET_INSTAWEB_UTIL_PUBLIC_CACHE_BATCHER_H_
00021 
00022 #include <cstddef>
00023 
00024 #include "net/instaweb/util/public/basictypes.h"
00025 #include "net/instaweb/util/public/cache_interface.h"
00026 #include "net/instaweb/util/public/scoped_ptr.h"
00027 #include "pagespeed/kernel/base/string.h"
00028 #include "pagespeed/kernel/base/string_util.h"
00029 
00030 namespace net_instaweb {
00031 
00032 class AbstractMutex;
00033 class SharedString;
00034 class Statistics;
00035 class Variable;
00036 
00050 class CacheBatcher : public CacheInterface {
00051  public:
00063   static const int kDefaultMaxParallelLookups = 1;
00064 
00069   static const size_t kDefaultMaxQueueSize = 1000;
00070 
00072   CacheBatcher(CacheInterface* cache, AbstractMutex* mutex,
00073                Statistics* statistics);
00074   virtual ~CacheBatcher();
00075 
00079   static void InitStats(Statistics* statistics);
00080 
00081   virtual void Get(const GoogleString& key, Callback* callback);
00082   virtual void Put(const GoogleString& key, SharedString* value);
00083   virtual void Delete(const GoogleString& key);
00084   virtual GoogleString Name() const;
00085   static GoogleString FormatName(StringPiece cache, int parallelism, int max);
00086 
00089   virtual bool IsBlocking() const { return cache_->IsBlocking(); }
00090 
00091   int last_batch_size() const { return last_batch_size_; }  
00092   void set_max_queue_size(size_t n) { max_queue_size_ = n; }
00093   void set_max_parallel_lookups(size_t n) { max_parallel_lookups_ = n; }
00094 
00095   int Pending(); 
00096 
00097   virtual bool IsHealthy() const { return cache_->IsHealthy(); }
00098   virtual void ShutDown();
00099 
00100  private:
00101   class Group;
00102   class BatcherCallback;
00103 
00104   void GroupComplete();
00105   bool CanIssueGet() const; 
00106 
00107   CacheInterface* cache_;
00108   scoped_ptr<AbstractMutex> mutex_;
00109   MultiGetRequest queue_;
00110   int last_batch_size_;
00111   int pending_;
00112   int max_parallel_lookups_;
00113   size_t max_queue_size_; 
00114   Variable* dropped_gets_;
00115 
00116   DISALLOW_COPY_AND_ASSIGN(CacheBatcher);
00117 };
00118 
00119 }  
00120 
00121 #endif  ///< NET_INSTAWEB_UTIL_PUBLIC_CACHE_BATCHER_H_
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