private ThreadStart Inserter <T1>(AtomicReferenceArray <T1> lastBatches, Generator[] generators, System.Threading.CountdownEvent insertersDone, ReadWriteLock updateLock, int slot) where T1 : Org.Neo4j.Kernel.Api.Index.IndexEntryUpdate <T1>
{
int worstCaseEntriesPerThread = BATCHES_PER_THREAD * MAX_BATCH_SIZE;
return(throwing(() =>
{
try
{
Generator generator = generators[slot] = new Generator(this, MAX_BATCH_SIZE, Random.seed() + slot, slot * worstCaseEntriesPerThread);
for (int j = 0; j < BATCHES_PER_THREAD; j++)
{
IList <IndexEntryUpdate <object> > batch = generator.Batch();
updateLock.readLock().@lock();
try
{
_populator.add(batch);
}
finally
{
updateLock.readLock().unlock();
}
lastBatches.set(slot, batch);
}
}
finally
{
// This helps the updater know when to stop updating
insertersDone.Signal();
}
}));
}
public void run()
{
if (random.nextFloat() < CHANCE_LARGE_TX)
{
// Few large transactions
using (Transaction tx = _outerInstance.db.beginTx())
{
for (int i = 0; i < LARGE_TX_SIZE; i++)
{
// Nodes are created with properties here. Whereas the properties don't have a functional
// impact on this test they do affect timings so that the issue is (was) triggered more often
// and therefore have a positive effect on this test.
_outerInstance.db.createNode(randomLabels()).setProperty("name", randomUUID().ToString());
}
tx.Success();
}
}
else
{
// Many small create/delete transactions
Node node;
using (Transaction tx = _outerInstance.db.beginTx())
{
node = _outerInstance.db.createNode(randomLabels());
_nodeHeads.set(_guy, node);
tx.Success();
}
if (random.nextFloat() < CHANCE_TO_DELETE_BY_SAME_THREAD)
{
// Most of the time delete in this thread
if (_nodeHeads.getAndSet(_guy, null) != null)
{
using (Transaction tx = _outerInstance.db.beginTx())
{
node.Delete();
tx.Success();
}
}
// Otherwise there will be other threads sitting there waiting for these nodes and deletes them if they can
}
}
}
//JAVA TO C# CONVERTER TODO TASK: Most Java annotations will not have direct .NET equivalent attributes:
//ORIGINAL LINE: @Test public void shouldBeAbleToSnapshotDuringHeavyLoad() throws Throwable
//JAVA TO C# CONVERTER WARNING: Method 'throws' clauses are not available in C#:
public virtual void ShouldBeAbleToSnapshotDuringHeavyLoad()
{
// GIVEN
//JAVA TO C# CONVERTER WARNING: The original Java variable was marked 'final':
//ORIGINAL LINE: final KernelTransactions transactions = newKernelTransactions();
KernelTransactions transactions = NewKernelTransactions();
Race race = new Race();
const int threads = 50;
//JAVA TO C# CONVERTER WARNING: The original Java variable was marked 'final':
//ORIGINAL LINE: final java.util.concurrent.atomic.AtomicBoolean end = new java.util.concurrent.atomic.AtomicBoolean();
AtomicBoolean end = new AtomicBoolean();
//JAVA TO C# CONVERTER WARNING: The original Java variable was marked 'final':
//ORIGINAL LINE: final java.util.concurrent.atomic.AtomicReferenceArray<KernelTransactionsSnapshot> snapshots = new java.util.concurrent.atomic.AtomicReferenceArray<>(threads);
AtomicReferenceArray <KernelTransactionsSnapshot> snapshots = new AtomicReferenceArray <KernelTransactionsSnapshot>(threads);
// Representing "transaction" threads
for (int i = 0; i < threads; i++)
{
//JAVA TO C# CONVERTER WARNING: The original Java variable was marked 'final':
//ORIGINAL LINE: final int threadIndex = i;
int threadIndex = i;
race.AddContestant(() =>
{
ThreadLocalRandom random = ThreadLocalRandom.current();
while (!end.get())
{
try
{
using (KernelTransaction transaction = GetKernelTransaction(transactions))
{
KernelTransactionsSnapshot snapshot = null;
try
{
parkNanos(MILLISECONDS.toNanos(random.Next(3)));
if (snapshots.get(threadIndex) == null)
{
requireNonNull(transactions, "transactions is null");
snapshot = requireNonNull(transactions.Get(), "transactions.get() returned null");
snapshots.set(threadIndex, snapshot);
parkNanos(MILLISECONDS.toNanos(random.Next(3)));
}
}
catch (Exception e)
{
StringBuilder sb = (new StringBuilder("Gotcha!\n")).Append("threadIndex=").Append(threadIndex).Append('\n').Append("transaction=").Append(transaction).Append('\n').Append("snapshots=").Append(snapshots).Append('\n').Append("snapshot=").Append(snapshot).Append('\n').Append("end=").Append(end);
throw new Exception(sb.ToString(), e);
}
}
}
catch (TransactionFailureException e)
{
throw new Exception(e);
}
}
});
}
// Just checks snapshots
race.AddContestant(() =>
{
ThreadLocalRandom random = ThreadLocalRandom.current();
int snapshotsLeft = 1_000;
while (snapshotsLeft > 0)
{
int threadIndex = random.Next(threads);
KernelTransactionsSnapshot snapshot = snapshots.get(threadIndex);
if (snapshot != null && snapshot.AllClosed())
{
snapshotsLeft--;
snapshots.set(threadIndex, null);
}
}
// End condition of this test can be described as:
// when 1000 snapshots have been seen as closed.
// setting this boolean to true will have all other threads end as well so that race.go() will end
end.set(true);
});
// WHEN
race.Go();
}
