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//=- CachePruning.h - Helper to manage the pruning of a cache dir -*- C++ -*-=//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements pruning of a directory intended for cache storage, using
// various policies.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_SUPPORT_CACHE_PRUNING_H
#define LLVM_SUPPORT_CACHE_PRUNING_H
#include "llvm/ADT/StringRef.h"
#include <chrono>
namespace llvm {
/// Handle pruning a directory provided a path and some options to control what
/// to prune.
class CachePruning {
public:
/// Prepare to prune \p Path.
CachePruning(StringRef Path) : Path(Path) {}
/// Define the pruning interval. This is intended to be used to avoid scanning
/// the directory too often. It does not impact the decision of which file to
/// prune. A value of 0 forces the scan to occurs.
CachePruning &setPruningInterval(std::chrono::seconds PruningInterval) {
Interval = PruningInterval;
return *this;
}
/// Define the expiration for a file. When a file hasn't been accessed for
/// \p ExpireAfter seconds, it is removed from the cache. A value of 0 disable
/// the expiration-based pruning.
CachePruning &setEntryExpiration(std::chrono::seconds ExpireAfter) {
Expiration = ExpireAfter;
return *this;
}
/// Define the maximum size for the cache directory, in terms of percentage of
/// the available space on the the disk. Set to 100 to indicate no limit, 50
/// to indicate that the cache size will not be left over half the
/// available disk space. A value over 100 will be reduced to 100. A value of
/// 0 disable the size-based pruning.
CachePruning &setMaxSize(unsigned Percentage) {
PercentageOfAvailableSpace = std::min(100u, Percentage);
return *this;
}
/// Peform pruning using the supplied options, returns true if pruning
/// occured, i.e. if PruningInterval was expired.
bool prune();
private:
// Options that matches the setters above.
std::string Path;
std::chrono::seconds Expiration = std::chrono::seconds::zero();
std::chrono::seconds Interval = std::chrono::seconds::zero();
unsigned PercentageOfAvailableSpace = 0;
};
} // namespace llvm
#endif
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