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https://github.com/XRPLF/rippled.git
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1eb0fdac65
This change renames all occurrences of `namespace ripple` and `ripple::` to `namespace xrpl` and `xrpl::`, respectively, as well as the names of test suites. It also provides a script to allow developers to replicate the changes in their local branch or fork to avoid conflicts.
65 lines
1.7 KiB
C++
65 lines
1.7 KiB
C++
#include <xrpl/basics/TaggedCache.ipp>
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#include <xrpl/ledger/CachedView.h>
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namespace xrpl {
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namespace detail {
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bool
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CachedViewImpl::exists(Keylet const& k) const
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{
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return read(k) != nullptr;
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}
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std::shared_ptr<SLE const>
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CachedViewImpl::read(Keylet const& k) const
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{
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static CountedObjects::Counter hits{"CachedView::hit"};
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static CountedObjects::Counter hitsexpired{"CachedView::hitExpired"};
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static CountedObjects::Counter misses{"CachedView::miss"};
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bool cacheHit = false;
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bool baseRead = false;
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auto const digest = [&]() -> std::optional<uint256> {
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{
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std::lock_guard lock(mutex_);
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auto const iter = map_.find(k.key);
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if (iter != map_.end())
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{
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cacheHit = true;
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return iter->second;
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}
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}
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return base_.digest(k.key);
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}();
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if (!digest)
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return nullptr;
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auto sle = cache_.fetch(*digest, [&]() {
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baseRead = true;
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return base_.read(k);
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});
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// If the sle is null, then a failure must have occurred in base_.read()
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XRPL_ASSERT(
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sle || baseRead, "xrpl::CachedView::read : null SLE result from base");
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if (cacheHit && baseRead)
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hitsexpired.increment();
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else if (cacheHit)
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hits.increment();
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else
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misses.increment();
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if (!cacheHit)
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{
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// Avoid acquiring this lock unless necessary. It is only necessary if
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// the key was not found in the map_. The lock is needed to add the key
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// and digest.
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std::lock_guard lock(mutex_);
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map_.emplace(k.key, *digest);
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}
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if (!sle || !k.check(*sle))
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return nullptr;
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return sle;
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}
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} // namespace detail
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} // namespace xrpl
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