| /* |
| * Copyright 2010 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. |
| */ |
| |
| // Author: jmarantz@google.com (Joshua Marantz) |
| |
| #ifndef PAGESPEED_KERNEL_UTIL_SIMPLE_STATS_H_ |
| #define PAGESPEED_KERNEL_UTIL_SIMPLE_STATS_H_ |
| |
| #include "pagespeed/kernel/base/abstract_mutex.h" |
| #include "pagespeed/kernel/base/basictypes.h" |
| #include "pagespeed/kernel/base/scoped_ptr.h" |
| #include "pagespeed/kernel/base/statistics.h" |
| #include "pagespeed/kernel/base/statistics_template.h" |
| #include "pagespeed/kernel/base/string.h" |
| #include "pagespeed/kernel/base/string_util.h" |
| |
| namespace net_instaweb { |
| |
| class AbstractMutex; |
| class ThreadSystem; |
| |
| // These variables are thread-safe. |
| class SimpleStatsVariable : public MutexedScalar { |
| public: |
| SimpleStatsVariable(StringPiece name, Statistics* stats); |
| virtual ~SimpleStatsVariable(); |
| virtual StringPiece GetName() const { return StringPiece(NULL); } |
| |
| void set_mutex(AbstractMutex* mutex) { mutex_.reset(mutex); } |
| |
| protected: |
| virtual AbstractMutex* mutex() const { return mutex_.get(); } |
| virtual int64 GetLockHeld() const; |
| virtual int64 SetReturningPreviousValueLockHeld(int64 value); |
| |
| private: |
| int64 value_; |
| scoped_ptr<AbstractMutex> mutex_; |
| DISALLOW_COPY_AND_ASSIGN(SimpleStatsVariable); |
| }; |
| |
| // Simple name/value pair statistics implementation. |
| class SimpleStats : public ScalarStatisticsTemplate<SimpleStatsVariable> { |
| public: |
| // SimpleStats will not take ownership of thread_system. The thread system is |
| // used to instantiate mutexes to allow SimpleStatsVariable to be thread-safe. |
| explicit SimpleStats(ThreadSystem* thread_system); |
| virtual ~SimpleStats(); |
| |
| void SetThreadSystem(ThreadSystem* x); |
| ThreadSystem* thread_system() const { return thread_system_; } |
| |
| virtual CountHistogram* NewHistogram(StringPiece name); |
| virtual Var* NewVariable(StringPiece name); |
| virtual UpDown* NewUpDownCounter(StringPiece name); |
| |
| private: |
| ThreadSystem* thread_system_; // Not owned by this class. |
| |
| DISALLOW_COPY_AND_ASSIGN(SimpleStats); |
| }; |
| |
| } // namespace net_instaweb |
| |
| #endif // PAGESPEED_KERNEL_UTIL_SIMPLE_STATS_H_ |