Page Speed Optimization Libraries  1.3.25.1
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 "net/instaweb/util/public/string.h"
00028 
00029 namespace net_instaweb {
00030 
00031 class AbstractMutex;
00032 class SharedString;
00033 class Statistics;
00034 class Variable;
00035 
00049 class CacheBatcher : public CacheInterface {
00050  public:
00062   static const int kDefaultMaxParallelLookups = 1;
00063 
00068   static const size_t kDefaultMaxQueueSize = 1000;
00069 
00071   CacheBatcher(CacheInterface* cache, AbstractMutex* mutex,
00072                Statistics* statistics);
00073   virtual ~CacheBatcher();
00074 
00078   static void InitStats(Statistics* statistics);
00079 
00080   virtual void Get(const GoogleString& key, Callback* callback);
00081   virtual void Put(const GoogleString& key, SharedString* value);
00082   virtual void Delete(const GoogleString& key);
00083   virtual const char* Name() const { return name_.c_str(); }
00084 
00087   virtual bool IsBlocking() const { return cache_->IsBlocking(); }
00088 
00089   int last_batch_size() const { return last_batch_size_; }  
00090   void set_max_queue_size(size_t n) { max_queue_size_ = n; }
00091   void set_max_parallel_lookups(size_t n) { max_parallel_lookups_ = n; }
00092 
00093   int Pending(); 
00094 
00095   virtual bool IsHealthy() const { return cache_->IsHealthy(); }
00096   virtual void ShutDown();
00097 
00098  private:
00099   class Group;
00100   class BatcherCallback;
00101 
00102   void GroupComplete();
00103   bool CanIssueGet() const; 
00104 
00105   scoped_ptr<CacheInterface> cache_;
00106   scoped_ptr<AbstractMutex> mutex_;
00107   GoogleString name_;
00108   MultiGetRequest queue_;
00109   int last_batch_size_;
00110   int pending_;
00111   int max_parallel_lookups_;
00112   size_t max_queue_size_; 
00113   Variable* dropped_gets_;
00114 
00115   DISALLOW_COPY_AND_ASSIGN(CacheBatcher);
00116 };
00117 
00118 }  
00119 
00120 #endif  ///< NET_INSTAWEB_UTIL_PUBLIC_CACHE_BATCHER_H_
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