Class ChangeSet

src/txmempool.h:618–691

     * mempool.
     */
    class ChangeSet {
    public:
        explicit ChangeSet(CTxMemPool* pool) : m_pool(pool) { m_pool->m_txgraph->StartStaging(); }
        ~ChangeSet() EXCLUSIVE_LOCKS_REQUIRED(m_pool->cs) {
            AssertLockHeld(m_pool->cs);
            if (m_pool->m_txgraph->HaveStaging()) {
                m_pool->m_txgraph->AbortStaging();
            }
            m_pool->m_have_changeset = false;
        }

        ChangeSet(const ChangeSet&) = delete;
        ChangeSet& operator=(const ChangeSet&) = delete;

        using TxHandle = CTxMemPool::txiter;

        TxHandle StageAddition(const CTransactionRef& tx, CAmount fee, int64_t time, unsigned int entry_height, uint64_t entry_sequence, bool spends_coinbase, int64_t sigops_cost, LockPoints lp);

        void StageRemoval(CTxMemPool::txiter it);

        const CTxMemPool::setEntries& GetRemovals() const { return m_to_remove; }

        /** Check if any cluster limits are exceeded. Returns true if pass, false if fail. */
        bool CheckMemPoolPolicyLimits();

        CTxMemPool::setEntries CalculateMemPoolAncestors(TxHandle tx)
        {
            // Look up transaction in our cache first
            auto it = m_ancestors.find(tx);
            if (it != m_ancestors.end()) return it->second;

            // If not found, try to have the mempool calculate it, and cache
            // for later.
            LOCK(m_pool->cs);
            auto ret = m_pool->CalculateMemPoolAncestors(*tx);
            m_ancestors.try_emplace(tx, ret);
            return ret;
        }

        std::vector<CTransactionRef> GetAddedTxns() const {
            std::vector<CTransactionRef> ret;
            ret.reserve(m_entry_vec.size());
            for (const auto& entry : m_entry_vec) {
                ret.emplace_back(entry->GetSharedTx());
            }
            return ret;
        }

        /**
         * Calculate the sorted chunks for the old and new mempool relating to the
         * clusters that would be affected by a potential replacement transaction.
         *
         * @return old and new diagram pair respectively, or an error string if the conflicts don't match a calculable topology
         */
        util::Result<std::pair<std::vector<FeeFrac>, std::vector<FeeFrac>>> CalculateChunksForRBF();

        size_t GetTxCount() const { return m_entry_vec.size(); }
        const CTransaction& GetAddedTxn(size_t index) const { return m_entry_vec.at(index)->GetTx(); }