57       cache_rep_(nullptr) {  in WriteBufferManager()
61     cache_rep_.reset(new CacheRep(cache));  in WriteBufferManager()
70   if (cache_rep_) {  in ~WriteBufferManager()
71     for (auto* handle : cache_rep_->dummy_handles_) {  in ~WriteBufferManager()
72       cache_rep_->cache_->Release(handle, true);  in ~WriteBufferManager()
81   assert(cache_rep_ != nullptr);  in ReserveMemWithCache()
84   std::lock_guard<std::mutex> lock(cache_rep_->cache_mutex_);  in ReserveMemWithCache()
88   while (new_mem_used > cache_rep_->cache_allocated_size_) {  in ReserveMemWithCache()
92     cache_rep_->cache_->Insert(cache_rep_->GetNextCacheKey(), nullptr,  in ReserveMemWithCache()
94     cache_rep_->dummy_handles_.push_back(handle);  in ReserveMemWithCache()
95     cache_rep_->cache_allocated_size_ += kSizeDummyEntry;  in ReserveMemWithCache()
104   assert(cache_rep_ != nullptr);  in FreeMemWithCache()
107   std::lock_guard<std::mutex> lock(cache_rep_->cache_mutex_);  in FreeMemWithCache()
119   if (new_mem_used < cache_rep_->cache_allocated_size_ / 4 * 3 &&  in FreeMemWithCache()
120       cache_rep_->cache_allocated_size_ - kSizeDummyEntry > new_mem_used) {  in FreeMemWithCache()
121     assert(!cache_rep_->dummy_handles_.empty());  in FreeMemWithCache()
122     cache_rep_->cache_->Release(cache_rep_->dummy_handles_.back(), true);  in FreeMemWithCache()
123     cache_rep_->dummy_handles_.pop_back();  in FreeMemWithCache()
124     cache_rep_->cache_allocated_size_ -= kSizeDummyEntry;  in FreeMemWithCache()