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34e85ccb62
All handling of Ledger in shared_ptr is modified to use a const managed object when the context requires immutable semantics.
73 lines
2.3 KiB
C++
73 lines
2.3 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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#ifndef RIPPLE_APP_LEDGER_LEDGERHOLDER_H_INCLUDED
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#define RIPPLE_APP_LEDGER_LEDGERHOLDER_H_INCLUDED
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#include <ripple/basics/contract.h>
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#include <mutex>
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namespace ripple {
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// Can std::atomic<std::shared_ptr>> make this lock free?
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// VFALCO NOTE This class can be replaced with atomic<shared_ptr<...>>
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/** Hold a ledger in a thread-safe way.
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VFALCO TODO The constructor should require a valid ledger, this
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way the object always holds a value. We can use the
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genesis ledger in all cases.
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*/
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class LedgerHolder
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{
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public:
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// Update the held ledger
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void set (std::shared_ptr<Ledger const> ledger)
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{
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if(! ledger)
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LogicError("LedgerHolder::set with nullptr");
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if(! ledger->isImmutable())
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LogicError("LedgerHolder::set with mutable Ledger");
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std::lock_guard <std::mutex> sl (m_lock);
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m_heldLedger = std::move(ledger);
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}
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// Return the (immutable) held ledger
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std::shared_ptr<Ledger const> get ()
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{
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std::lock_guard <std::mutex> sl (m_lock);
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return m_heldLedger;
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}
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bool empty ()
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{
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std::lock_guard <std::mutex> sl (m_lock);
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return m_heldLedger == nullptr;
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}
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private:
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std::mutex m_lock;
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std::shared_ptr<Ledger const> m_heldLedger;
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};
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} // ripple
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#endif
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