Martin Michelsen
44 lines
1.3 KiB
C++
44 lines
1.3 KiB
C++
#include "FileContentsCache.hh"
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#include <unistd.h>
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#include <phosg/Filesystem.hh>
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#include <phosg/Time.hh>
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using namespace std;
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FileContentsCache::File::File(const string& name, shared_ptr<const string> contents,
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uint64_t load_time) : name(name), contents(contents), load_time(load_time) { }
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shared_ptr<const string> FileContentsCache::get(const std::string& name) {
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return this->get(name, [name]() -> string { return load_file(name); });
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}
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shared_ptr<const string> FileContentsCache::get(const char* name) {
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return this->get(string(name));
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}
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shared_ptr<const string> FileContentsCache::get(const std::string& name,
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std::function<std::string()> generate) {
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uint64_t t = now();
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try {
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auto& entry = this->name_to_file.at(name);
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if (t - entry.load_time < 300000000) { // not 5 minutes old? return it
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return entry.contents;
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}
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} catch (const out_of_range& e) { }
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shared_ptr<const string> contents(new string(generate()));
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this->name_to_file.erase(name);
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this->name_to_file.emplace(piecewise_construct, forward_as_tuple(name),
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forward_as_tuple(name, contents, t));
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return contents;
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}
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shared_ptr<const string> FileContentsCache::get(const char* name,
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std::function<std::string()> generate) {
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return this->get(string(name), generate);
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}
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