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b9e2341b69
* One hits the global cache, one does not. * Also some extra checking. Co-authored-by: Bronek Kozicki <brok@incorrekt.com>
86 lines
2.8 KiB
C++
86 lines
2.8 KiB
C++
//------------------------------------------------------------------------------
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/*
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This file is part of rippled: https://github.com/ripple/rippled
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Copyright (c) 2012, 2013 Ripple Labs Inc.
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL , DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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//==============================================================================
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#include <xrpld/ledger/CachedView.h>
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#include <xrpl/basics/contract.h>
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#include <xrpl/protocol/Serializer.h>
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namespace ripple {
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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,
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"ripple::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 ripple
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