| /* |
| * 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_BASE_NULL_STATISTICS_H_ |
| #define PAGESPEED_KERNEL_BASE_NULL_STATISTICS_H_ |
| |
| #include "pagespeed/kernel/base/basictypes.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 CountHistogram; |
| class Statistics; |
| |
| class NullStatisticsVariable { |
| public: |
| NullStatisticsVariable(StringPiece name, Statistics* statistics) {} |
| ~NullStatisticsVariable() {} |
| void Set(int64 value) { } |
| int64 Get() const { return 0; } |
| int64 AddHelper(int64 delta) const { return 0; } |
| StringPiece GetName() const { return StringPiece(NULL); } |
| |
| private: |
| DISALLOW_COPY_AND_ASSIGN(NullStatisticsVariable); |
| }; |
| |
| // Simple name/value pair statistics implementation. |
| class NullStatistics : public ScalarStatisticsTemplate<NullStatisticsVariable> { |
| public: |
| NullStatistics(); |
| virtual ~NullStatistics(); |
| |
| virtual CountHistogram* NewHistogram(StringPiece name); |
| |
| private: |
| DISALLOW_COPY_AND_ASSIGN(NullStatistics); |
| }; |
| |
| } // namespace net_instaweb |
| |
| #endif // PAGESPEED_KERNEL_BASE_NULL_STATISTICS_H_ |