C++ CCoinsMap类代码示例

bool CCoinsViewCache::BatchWrite(CCoinsMap &mapCoins, const uint256 &hashBlockIn) {
    assert(!hasModifier);
    for (CCoinsMap::iterator it = mapCoins.begin(); it != mapCoins.end();) {
        if (it->second.flags & CCoinsCacheEntry::DIRTY) { // Ignore non-dirty entries (optimization).
            CCoinsMap::iterator itUs = cacheCoins.find(it->first);
            if (itUs == cacheCoins.end()) {
                if (!it->second.coins.IsPruned()) {
                    // The parent cache does not have an entry, while the child
                    // cache does have (a non-pruned) one. Move the data up, and
                    // mark it as fresh (if the grandparent did have it, we
                    // would have pulled it in at first GetCoins).
                    assert(it->second.flags & CCoinsCacheEntry::FRESH);
                    CCoinsCacheEntry& entry = cacheCoins[it->first];
                    entry.coins.swap(it->second.coins);
                    entry.flags = CCoinsCacheEntry::DIRTY | CCoinsCacheEntry::FRESH;
                }
            } else {
                if ((itUs->second.flags & CCoinsCacheEntry::FRESH) && it->second.coins.IsPruned()) {
                    // The grandparent does not have an entry, and the child is
                    // modified and being pruned. This means we can just delete
                    // it from the parent.
                    cacheCoins.erase(itUs);
                } else {
                    // A normal modification.
                    itUs->second.coins.swap(it->second.coins);
                    itUs->second.flags |= CCoinsCacheEntry::DIRTY;
                }
            }
        }
        CCoinsMap::iterator itOld = it++;
        mapCoins.erase(itOld);
    }
    hashBlock = hashBlockIn;
    return true;
}

bool CCoinsViewCache::BatchWrite(CCoinsMap &mapCoins, const uint256 &hashBlockIn) {
    for (CCoinsMap::iterator it = mapCoins.begin(); it != mapCoins.end(); it = mapCoins.erase(it)) {
        // Ignore non-dirty entries (optimization).
        if (!(it->second.flags & CCoinsCacheEntry::DIRTY)) {
            continue;
        }
        CCoinsMap::iterator itUs = cacheCoins.find(it->first);
        if (itUs == cacheCoins.end()) {
            // The parent cache does not have an entry, while the child does
            // We can ignore it if it's both FRESH and pruned in the child
            if (!(it->second.flags & CCoinsCacheEntry::FRESH && it->second.coin.IsSpent())) {
                // Otherwise we will need to create it in the parent
                // and move the data up and mark it as dirty
                CCoinsCacheEntry& entry = cacheCoins[it->first];
                entry.coin = std::move(it->second.coin);
                cachedCoinsUsage += entry.coin.DynamicMemoryUsage();
                entry.flags = CCoinsCacheEntry::DIRTY;
                // We can mark it FRESH in the parent if it was FRESH in the child
                // Otherwise it might have just been flushed from the parent's cache
                // and already exist in the grandparent
                if (it->second.flags & CCoinsCacheEntry::FRESH) {
                    entry.flags |= CCoinsCacheEntry::FRESH;
                }
            }
        } else {
            // Assert that the child cache entry was not marked FRESH if the
            // parent cache entry has unspent outputs. If this ever happens,
            // it means the FRESH flag was misapplied and there is a logic
            // error in the calling code.
            if ((it->second.flags & CCoinsCacheEntry::FRESH) && !itUs->second.coin.IsSpent()) {
                throw std::logic_error("FRESH flag misapplied to cache entry for base transaction with spendable outputs");
            }

            // Found the entry in the parent cache
            if ((itUs->second.flags & CCoinsCacheEntry::FRESH) && it->second.coin.IsSpent()) {
                // The grandparent does not have an entry, and the child is
                // modified and being pruned. This means we can just delete
                // it from the parent.
                cachedCoinsUsage -= itUs->second.coin.DynamicMemoryUsage();
                cacheCoins.erase(itUs);
            } else {
                // A normal modification.
                cachedCoinsUsage -= itUs->second.coin.DynamicMemoryUsage();
                itUs->second.coin = std::move(it->second.coin);
                cachedCoinsUsage += itUs->second.coin.DynamicMemoryUsage();
                itUs->second.flags |= CCoinsCacheEntry::DIRTY;
                // NOTE: It is possible the child has a FRESH flag here in
                // the event the entry we found in the parent is pruned. But
                // we must not copy that FRESH flag to the parent as that
                // pruned state likely still needs to be communicated to the
                // grandparent.
            }
        }
    }
    hashBlock = hashBlockIn;
    return true;
}

bool CCoinsViewCache::BatchWrite(CCoinsMap &mapCoins, const uint256 &hashBlockIn) {
    for (CCoinsMap::iterator it = mapCoins.begin(); it != mapCoins.end();) {
        cacheCoins[it->first].swap(it->second);
        CCoinsMap::iterator itOld = it++;
        mapCoins.erase(itOld);
    }
    hashBlock = hashBlockIn;
    return true;
}

void GetCoinsMapEntry(const CCoinsMap& map, CAmount& value, char& flags)
{
    auto it = map.find(OUTPOINT);
    if (it == map.end()) {
        value = ABSENT;
        flags = NO_ENTRY;
    } else {
        if (it->second.coin.IsSpent()) {
            value = PRUNED;
        } else {
            value = it->second.coin.out.nValue;
        }
        flags = it->second.flags;
        assert(flags != NO_ENTRY);
    }
}

bool CCoinsViewCache::BatchWrite(CCoinsMap &mapCoins, const uint256 &hashBlockIn, const CNameCache &names) {
    assert(!hasModifier);
    for (CCoinsMap::iterator it = mapCoins.begin(); it != mapCoins.end();) {
        if (it->second.flags & CCoinsCacheEntry::DIRTY) { // Ignore non-dirty entries (optimization).
            CCoinsMap::iterator itUs = cacheCoins.find(it->first);
            if (itUs == cacheCoins.end()) {
                // The parent cache does not have an entry, while the child does
                // We can ignore it if it's both FRESH and pruned in the child
                if (!(it->second.flags & CCoinsCacheEntry::FRESH && it->second.coins.IsPruned())) {
                    // Otherwise we will need to create it in the parent
                    // and move the data up and mark it as dirty
                    CCoinsCacheEntry& entry = cacheCoins[it->first];
                    entry.coins.swap(it->second.coins);
                    cachedCoinsUsage += entry.coins.DynamicMemoryUsage();
                    entry.flags = CCoinsCacheEntry::DIRTY;
                    // We can mark it FRESH in the parent if it was FRESH in the child
                    // Otherwise it might have just been flushed from the parent's cache
                    // and already exist in the grandparent
                    if (it->second.flags & CCoinsCacheEntry::FRESH)
                        entry.flags |= CCoinsCacheEntry::FRESH;
                }
            } else {
                // Found the entry in the parent cache
                if ((itUs->second.flags & CCoinsCacheEntry::FRESH) && it->second.coins.IsPruned()) {
                    // The grandparent does not have an entry, and the child is
                    // modified and being pruned. This means we can just delete
                    // it from the parent.
                    cachedCoinsUsage -= itUs->second.coins.DynamicMemoryUsage();
                    cacheCoins.erase(itUs);
                } else {
                    // A normal modification.
                    cachedCoinsUsage -= itUs->second.coins.DynamicMemoryUsage();
                    itUs->second.coins.swap(it->second.coins);
                    cachedCoinsUsage += itUs->second.coins.DynamicMemoryUsage();
                    itUs->second.flags |= CCoinsCacheEntry::DIRTY;
                }
            }
        }
        CCoinsMap::iterator itOld = it++;
        mapCoins.erase(itOld);
    }
    hashBlock = hashBlockIn;
    cacheNames.apply(names);
    return true;
}

bool CCoinsViewDB::BatchWrite(CCoinsMap &mapCoins, const uint256 &hashBlock) {
    CDBBatch batch(db);
    size_t count = 0;
    size_t changed = 0;
    for (CCoinsMap::iterator it = mapCoins.begin(); it != mapCoins.end();) {
        if (it->second.flags & CCoinsCacheEntry::DIRTY) {
            if (it->second.coins.IsPruned())
                batch.Erase(std::make_pair(DB_COINS, it->first));
            else
                batch.Write(std::make_pair(DB_COINS, it->first), it->second.coins);
            changed++;
        }
        count++;
        CCoinsMap::iterator itOld = it++;
        mapCoins.erase(itOld);
    }
    if (!hashBlock.IsNull())
        batch.Write(DB_BEST_BLOCK, hashBlock);

    LogPrint("coindb", "Committing %u changed transactions (out of %u) to coin database...\n", (unsigned int)changed, (unsigned int)count);
    return db.WriteBatch(batch);
}

bool CCoinsViewCache::BatchWrite(CCoinsMap& mapCoins, const uint256& hashBlockIn)
{
    assert(!hasModifier);
    for (CCoinsMap::iterator it = mapCoins.begin(); it != mapCoins.end();) {
        if (it->second.flags & CCoinsCacheEntry::DIRTY) { // Ignore non-dirty entries (optimization).
            CCoinsMap::iterator itUs = cacheCoins.find(it->first);
            if (itUs == cacheCoins.end()) {

                if (!(it->second.flags & CCoinsCacheEntry::FRESH && it->second.coins.IsPruned())) {

                    CCoinsCacheEntry& entry = cacheCoins[it->first];
                    entry.coins.swap(it->second.coins);
                    cachedCoinsUsage += entry.coins.DynamicMemoryUsage();
                    entry.flags = CCoinsCacheEntry::DIRTY;

                    if (it->second.flags & CCoinsCacheEntry::FRESH)
                        entry.flags |= CCoinsCacheEntry::FRESH;
                }
            } else {

                if ((itUs->second.flags & CCoinsCacheEntry::FRESH) && it->second.coins.IsPruned()) {

                    cachedCoinsUsage -= itUs->second.coins.DynamicMemoryUsage();
                    cacheCoins.erase(itUs);
                } else {

                    cachedCoinsUsage -= itUs->second.coins.DynamicMemoryUsage();
                    itUs->second.coins.swap(it->second.coins);
                    cachedCoinsUsage += itUs->second.coins.DynamicMemoryUsage();
                    itUs->second.flags |= CCoinsCacheEntry::DIRTY;
                }
            }
        }
        CCoinsMap::iterator itOld = it++;
        mapCoins.erase(itOld);
    }
    hashBlock = hashBlockIn;
    return true;
}

static size_t InsertCoinsMapEntry(CCoinsMap& map, CAmount value, char flags)
{
    if (value == ABSENT) {
        assert(flags == NO_ENTRY);
        return 0;
    }
    assert(flags != NO_ENTRY);
    CCoinsCacheEntry entry;
    entry.flags = flags;
    SetCoinsValue(value, entry.coin);
    auto inserted = map.emplace(OUTPOINT, std::move(entry));
    assert(inserted.second);
    return inserted.first->second.coin.DynamicMemoryUsage();
}

bool CCoinsViewCache::BatchWrite(CCoinsMap &mapCoins,
                                 const uint256 &hashBlockIn,
                                 const uint256 &hashAnchorIn,
                                 CAnchorsMap &mapAnchors,
                                 CNullifiersMap &mapNullifiers) {
    assert(!hasModifier);
    for (CCoinsMap::iterator it = mapCoins.begin(); it != mapCoins.end();) {
        if (it->second.flags & CCoinsCacheEntry::DIRTY) { // Ignore non-dirty entries (optimization).
            CCoinsMap::iterator itUs = cacheCoins.find(it->first);
            if (itUs == cacheCoins.end()) {
                if (!it->second.coins.IsPruned()) {
                    // The parent cache does not have an entry, while the child
                    // cache does have (a non-pruned) one. Move the data up, and
                    // mark it as fresh (if the grandparent did have it, we
                    // would have pulled it in at first GetCoins).
                    assert(it->second.flags & CCoinsCacheEntry::FRESH);
                    CCoinsCacheEntry& entry = cacheCoins[it->first];
                    entry.coins.swap(it->second.coins);
                    cachedCoinsUsage += memusage::DynamicUsage(entry.coins);
                    entry.flags = CCoinsCacheEntry::DIRTY | CCoinsCacheEntry::FRESH;
                }
            } else {
                if ((itUs->second.flags & CCoinsCacheEntry::FRESH) && it->second.coins.IsPruned()) {
                    // The grandparent does not have an entry, and the child is
                    // modified and being pruned. This means we can just delete
                    // it from the parent.
                    cachedCoinsUsage -= memusage::DynamicUsage(itUs->second.coins);
                    cacheCoins.erase(itUs);
                } else {
                    // A normal modification.
                    cachedCoinsUsage -= memusage::DynamicUsage(itUs->second.coins);
                    itUs->second.coins.swap(it->second.coins);
                    cachedCoinsUsage += memusage::DynamicUsage(itUs->second.coins);
                    itUs->second.flags |= CCoinsCacheEntry::DIRTY;
                }
            }
        }
        CCoinsMap::iterator itOld = it++;
        mapCoins.erase(itOld);
    }

    for (CAnchorsMap::iterator child_it = mapAnchors.begin(); child_it != mapAnchors.end();)
    {
        if (child_it->second.flags & CAnchorsCacheEntry::DIRTY) {
            CAnchorsMap::iterator parent_it = cacheAnchors.find(child_it->first);

            if (parent_it == cacheAnchors.end()) {
                CAnchorsCacheEntry& entry = cacheAnchors[child_it->first];
                entry.entered = child_it->second.entered;
                entry.tree = child_it->second.tree;
                entry.flags = CAnchorsCacheEntry::DIRTY;

                cachedCoinsUsage += memusage::DynamicUsage(entry.tree);
            } else {
                if (parent_it->second.entered != child_it->second.entered) {
                    // The parent may have removed the entry.
                    parent_it->second.entered = child_it->second.entered;
                    parent_it->second.flags |= CAnchorsCacheEntry::DIRTY;
                }
            }
        }

        CAnchorsMap::iterator itOld = child_it++;
        mapAnchors.erase(itOld);
    }

    for (CNullifiersMap::iterator child_it = mapNullifiers.begin(); child_it != mapNullifiers.end();)
    {
        if (child_it->second.flags & CNullifiersCacheEntry::DIRTY) { // Ignore non-dirty entries (optimization).
            CNullifiersMap::iterator parent_it = cacheNullifiers.find(child_it->first);

            if (parent_it == cacheNullifiers.end()) {
                CNullifiersCacheEntry& entry = cacheNullifiers[child_it->first];
                entry.entered = child_it->second.entered;
                entry.flags = CNullifiersCacheEntry::DIRTY;
            } else {
                if (parent_it->second.entered != child_it->second.entered) {
                    parent_it->second.entered = child_it->second.entered;
                    parent_it->second.flags |= CNullifiersCacheEntry::DIRTY;
                }
            }
        }
        CNullifiersMap::iterator itOld = child_it++;
        mapNullifiers.erase(itOld);
    }

    hashAnchor = hashAnchorIn;
    hashBlock = hashBlockIn;
    return true;
}