Mercurial > hg > orthanc
view OrthancFramework/Sources/Cache/MemoryCache.cpp @ 5420:d37dff2c0028 am-new-cache
Optimized the MemoryStringCache to prevent loading the same file multiple times if multiple users request the same file at the same time
author | Alain Mazy <am@osimis.io> |
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date | Mon, 13 Nov 2023 17:01:59 +0100 |
parents | 0ea402b4d901 |
children | 48b8dae6dc77 |
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/** * Orthanc - A Lightweight, RESTful DICOM Store * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics * Department, University Hospital of Liege, Belgium * Copyright (C) 2017-2023 Osimis S.A., Belgium * Copyright (C) 2021-2023 Sebastien Jodogne, ICTEAM UCLouvain, Belgium * * This program is free software: you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public License * as published by the Free Software Foundation, either version 3 of * the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this program. If not, see * <http://www.gnu.org/licenses/>. **/ #include "../PrecompiledHeaders.h" #include "MemoryCache.h" #include "../Logging.h" namespace Orthanc { namespace Deprecated { MemoryCache::Page& MemoryCache::Load(const std::string& id) { // Reuse the cache entry if it already exists Page* p = NULL; if (index_.Contains(id, p)) { LOG(TRACE) << "Reusing a cache page"; assert(p != NULL); index_.MakeMostRecent(id); return *p; } // The id is not in the cache yet. Make some room if the cache // is full. if (index_.GetSize() == cacheSize_) { LOG(TRACE) << "Dropping the oldest cache page"; index_.RemoveOldest(p); delete p; } // Create a new cache page std::unique_ptr<Page> result(new Page); result->id_ = id; result->content_.reset(provider_.Provide(id)); // Add the newly create page to the cache LOG(TRACE) << "Registering new data in a cache page"; p = result.release(); index_.Add(id, p); return *p; } MemoryCache::MemoryCache(ICachePageProvider& provider, size_t cacheSize) : provider_(provider), cacheSize_(cacheSize) { } void MemoryCache::Invalidate(const std::string& id) { Page* p = NULL; if (index_.Contains(id, p)) { LOG(TRACE) << "Invalidating a cache page"; assert(p != NULL); delete p; index_.Invalidate(id); } } MemoryCache::~MemoryCache() { while (!index_.IsEmpty()) { Page* element = NULL; index_.RemoveOldest(element); assert(element != NULL); delete element; } } IDynamicObject& MemoryCache::Access(const std::string& id) { return *Load(id).content_; } } }