| // Copyright 2010-2015, Google Inc. |
| // All rights reserved. |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following disclaimer |
| // in the documentation and/or other materials provided with the |
| // distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived from |
| // this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #ifndef MOZC_CONVERTER_CACHED_CONNECTOR_H_ |
| #define MOZC_CONVERTER_CACHED_CONNECTOR_H_ |
| |
| #include "base/port.h" |
| #include "base/scoped_ptr.h" |
| #include "converter/connector_interface.h" |
| |
| namespace mozc { |
| namespace converter { |
| |
| // Provides cache mechanism for Connector. |
| class CachedConnector : public ConnectorInterface { |
| public: |
| // |cache_size| should be 2^k form of value. |
| CachedConnector(ConnectorInterface *connector, int cache_size); |
| virtual ~CachedConnector(); |
| |
| virtual int GetTransitionCost(uint16 rid, uint16 lid) const; |
| virtual int GetResolution() const; |
| |
| // Clears cache explicitly. |
| void ClearCache(); |
| |
| private: |
| void InitializeCache() const; |
| |
| ConnectorInterface *connector_; |
| |
| // Cache data need to be mutable as they are modified in const methods. For |
| // the performance, we are assuming the cache is an array, not vector. |
| mutable bool cache_initialized_; |
| mutable scoped_ptr<int[]> cache_key_; |
| mutable scoped_ptr<int[]> cache_value_; |
| const int cache_size_; |
| const int hash_mask_; |
| |
| |
| DISALLOW_COPY_AND_ASSIGN(CachedConnector); |
| }; |
| |
| } // namespace converter |
| } // namespace mozc |
| |
| #endif // MOZC_CONVERTER_CACHED_CONNECTOR_H_ |