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Merge #19085: Refactor: clean up PeriodicFlush()

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e846a2a1d9 refactor: clean up PeriodicFlush() (John Newbery)

Pull request description:

  `PeriodicFlush()` is much more convoluted than it needs to be: it has triple nesting, local variables counting refs and return values, and increments the `mapFileUseCount` iterator unnecessarily. Removing all of that makes the function much easier to understand.

ACKs for top commit:
  MarcoFalke:
    ACK e846a2a1d9 🎁
  jonatack:
    re-ACK e846a2a per `git range-diff f7c19e8 7c10020 e846a2a`
  promag:
    ACK e846a2a1d9.

Tree-SHA512: 22bc600a5268b139c0a2c16b5a9f14837b262670ec24aef00643fcedd1c3ebcbf46dea1633e76adc8acf78e8840b776e17127307c5ee95308caa94239dad5b88
This commit is contained in:
MarcoFalke 2020-07-09 12:54:03 +02:00
commit c4a44186d8
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1 changed files with 23 additions and 32 deletions
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55
src/wallet/bdb.cpp
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@ -615,42 +615,33 @@ void BerkeleyEnvironment::Flush(bool fShutdown)
bool BerkeleyDatabase::PeriodicFlush()
{
if (IsDummy()) {
return true;
}
bool ret = false;
// There's nothing to do for dummy databases. Return true.
if (IsDummy()) return true;
// Don't flush if we can't acquire the lock.
TRY_LOCK(cs_db, lockDb);
if (lockDb)
{
// Don't do this if any databases are in use
int nRefCount = 0;
std::map<std::string, int>::iterator mit = env->mapFileUseCount.begin();
while (mit != env->mapFileUseCount.end())
{
nRefCount += (*mit).second;
mit++;
}
if (!lockDb) return false;
if (nRefCount == 0)
{
std::map<std::string, int>::iterator mi = env->mapFileUseCount.find(strFile);
if (mi != env->mapFileUseCount.end())
{
LogPrint(BCLog::WALLETDB, "Flushing %s\n", strFile);
int64_t nStart = GetTimeMillis();
// Flush wallet file so it's self contained
env->CloseDb(strFile);
env->CheckpointLSN(strFile);
env->mapFileUseCount.erase(mi++);
LogPrint(BCLog::WALLETDB, "Flushed %s %dms\n", strFile, GetTimeMillis() - nStart);
ret = true;
}
}
// Don't flush if any databases are in use
for (auto it = env->mapFileUseCount.begin() ; it != env->mapFileUseCount.end(); it++) {
if ((*it).second > 0) return false;
}
return ret;
// Don't flush if there haven't been any batch writes for this database.
auto it = env->mapFileUseCount.find(strFile);
if (it == env->mapFileUseCount.end()) return false;
LogPrint(BCLog::WALLETDB, "Flushing %s\n", strFile);
int64_t nStart = GetTimeMillis();
// Flush wallet file so it's self contained
env->CloseDb(strFile);
env->CheckpointLSN(strFile);
env->mapFileUseCount.erase(it);
LogPrint(BCLog::WALLETDB, "Flushed %s %dms\n", strFile, GetTimeMillis() - nStart);
return true;
}
bool BerkeleyDatabase::Backup(const std::string& strDest) const