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AllPersistenceIdsPublisher.cs
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AllPersistenceIdsPublisher.cs
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//-----------------------------------------------------------------------
// <copyright file="AllPersistenceIdsPublisher.cs" company="Akka.NET Project">
// Copyright (C) 2009-2022 Lightbend Inc. <http://www.lightbend.com>
// Copyright (C) 2013-2022 .NET Foundation <https://github.com/akkadotnet/akka.net>
// </copyright>
//-----------------------------------------------------------------------
using System;
using Akka.Actor;
using Akka.Event;
using Akka.Persistence.Sql.Common.Journal;
using Akka.Streams.Actors;
namespace Akka.Persistence.Query.Sql
{
internal sealed class CurrentPersistenceIdsPublisher : ActorPublisher<string>, IWithUnboundedStash
{
public static Props Props(string writeJournalPluginId)
{
return Actor.Props.Create(() => new CurrentPersistenceIdsPublisher(writeJournalPluginId));
}
private readonly IActorRef _journalRef;
private readonly DeliveryBuffer<string> _buffer;
private readonly ILoggingAdapter _log;
public IStash Stash { get; set; }
public CurrentPersistenceIdsPublisher(string writeJournalPluginId)
{
_buffer = new DeliveryBuffer<string>(OnNext);
_journalRef = Persistence.Instance.Apply(Context.System).JournalFor(writeJournalPluginId);
_log = Context.GetLogger();
}
protected override bool Receive(object message)
{
switch (message)
{
case Request _:
Become(Initializing);
_journalRef
.Ask<CurrentPersistenceIds>(new SelectCurrentPersistenceIds(0, Self))
.PipeTo(Self);
return true;
case Cancel _:
Context.Stop(Self);
return true;
default:
return false;
}
}
private bool Initializing(object message)
{
switch (message)
{
case CurrentPersistenceIds current:
_buffer.AddRange(current.AllPersistenceIds);
_buffer.DeliverBuffer(TotalDemand);
if (_buffer.IsEmpty)
{
OnCompleteThenStop();
return true;
}
Become(Active);
Stash.UnstashAll();
return true;
case Cancel _:
Context.Stop(Self);
return true;
case Status.Failure msg:
if (msg.Cause is AskTimeoutException e)
{
_log.Info(e, "Current persistence id query timed out, retrying");
}
else
{
_log.Info(msg.Cause, "Current persistence id query failed, retrying");
}
_journalRef
.Ask<CurrentPersistenceIds>(new SelectCurrentPersistenceIds(0, Self))
.PipeTo(Self);
return true;
default:
Stash.Stash();
return true;
}
}
private bool Active(object message)
{
switch (message)
{
case CurrentPersistenceIds _:
// Ignore duplicate CurrentPersistenceIds response
return true;
case Request _:
_buffer.DeliverBuffer(TotalDemand);
if (_buffer.IsEmpty)
OnCompleteThenStop();
return true;
case Cancel _:
Context.Stop(Self);
return true;
default:
return false;
}
}
}
internal sealed class LivePersistenceIdsPublisher : ActorPublisher<string>, IWithUnboundedStash
{
private sealed class Continue
{
public static readonly Continue Instance = new Continue();
private Continue() { }
}
public static Props Props(TimeSpan refreshInterval, string writeJournalPluginId)
{
return Actor.Props.Create(() => new LivePersistenceIdsPublisher(refreshInterval, writeJournalPluginId));
}
private long _lastOrderingOffset;
private readonly ICancelable _tickCancelable;
private readonly IActorRef _journalRef;
private readonly DeliveryBuffer<string> _buffer;
private readonly ILoggingAdapter _log;
public IStash Stash { get; set; }
public LivePersistenceIdsPublisher(TimeSpan refreshInterval, string writeJournalPluginId)
{
_log = Context.GetLogger();
_tickCancelable = Context.System.Scheduler.ScheduleTellRepeatedlyCancelable(
refreshInterval,
refreshInterval,
Self,
Continue.Instance,
Self);
_buffer = new DeliveryBuffer<string>(OnNext);
_journalRef = Persistence.Instance.Apply(Context.System).JournalFor(writeJournalPluginId);
}
protected override void PostStop()
{
_tickCancelable.Cancel();
base.PostStop();
}
protected override bool Receive(object message)
{
switch (message)
{
case Request _:
Become(Waiting);
_journalRef
.Ask<CurrentPersistenceIds>(new SelectCurrentPersistenceIds(_lastOrderingOffset, Self))
.PipeTo(Self);
return true;
case Continue _:
return true;
case Cancel _:
Context.Stop(Self);
return true;
default:
return false;
}
}
private bool Waiting(object message)
{
switch (message)
{
case CurrentPersistenceIds current:
_lastOrderingOffset = current.HighestOrderingNumber;
_buffer.AddRange(current.AllPersistenceIds);
_buffer.DeliverBuffer(TotalDemand);
Become(Active);
Stash.UnstashAll();
return true;
case Continue _:
return true;
case Cancel _:
Context.Stop(Self);
return true;
case Status.Failure msg:
if (msg.Cause is AskTimeoutException e)
{
_log.Info(e, $"Current persistence id query timed out, retrying. Offset: {_lastOrderingOffset}");
}
else
{
_log.Info(msg.Cause, $"Current persistence id query failed, retrying. Offset: {_lastOrderingOffset}");
}
Become(Active);
Stash.UnstashAll();
return true;
default:
Stash.Stash();
return true;
}
}
private bool Active(object message)
{
switch (message)
{
case CurrentPersistenceIds _:
// Ignore duplicate CurrentPersistenceIds response
return true;
case Request _:
_buffer.DeliverBuffer(TotalDemand);
return true;
case Continue _:
Become(Waiting);
_journalRef
.Ask<CurrentPersistenceIds>(new SelectCurrentPersistenceIds(_lastOrderingOffset, Self))
.PipeTo(Self);
return true;
case Cancel _:
Context.Stop(Self);
return true;
case Status.Failure msg:
_log.Info(msg.Cause, "Unexpected failure received");
return true;
default:
return false;
}
}
}
}