30394116826

Committed 28 Jul 2026 07:56PM UTC coverage: 74.382%. First build

Build # 30394116826

Build Type

Pull #46

github

Committed by

web-flow

Commit Message

Merge a20371fc5 into c324de21a

Pull Request Pull Request #46: Address PR comments

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63.66

/src/Immediate.Jobs.Shared/SingleServerJobStorage.cs

namespace Immediate.Jobs.Shared;

/// <summary>
/// A single-server storage topology that executes against an authoritative in-process store while
/// synchronously replicating changes to durable storage and restoring them when the process starts.
/// </summary>
public sealed class SingleServerJobStorage :
        IRecurringJobStorage,
        IJobGraphStorage,
        IAsyncDisposable,
        IDisposable
{
        private const int RecoveryBatchSize = 1000;
        private readonly TimeProvider _timeProvider;
#pragma warning disable CA2213 // Kept alive so callers already waiting during disposal can safely leave the semaphore.
        private readonly SemaphoreSlim _initialization = new(1, 1);
#pragma warning restore CA2213
        private readonly IRecurringJobStorage _recurringDurableStorage;
        private readonly IJobGraphStorage _graphDurableStorage;
#pragma warning disable IDE0330 // System.Threading.Lock is unavailable on the lowest target framework.
        private readonly object _disposeGate = new();
#pragma warning restore IDE0330
        private InMemoryJobStorage _primary;
        private bool _initialized;
        private Task? _disposeTask;
        private int _disposeStarted;

        /// <summary>Creates a memory-primary store backed by the supplied durable replica.</summary>
        /// <remarks>The wrapper takes ownership of <paramref name="durableStorage"/> and disposes it with the primary store.</remarks>
        public SingleServerJobStorage(IJobStorage durableStorage, TimeProvider timeProvider)
        {
                ArgumentNullException.ThrowIfNull(durableStorage);
                ArgumentNullException.ThrowIfNull(timeProvider);
                if (durableStorage is SingleServerJobStorage)
                        throw new ArgumentException("A single-server store cannot be used as its own durable replica.", nameof(durableStorage));
                if (durableStorage is not IJobStorageReplica)
                        throw new ArgumentException("Single-server durable storage must implement IJobStorageReplica.", nameof(durableStorage));
                if (durableStorage is not IRecurringJobStorage recurringDurableStorage)
                        throw new ArgumentException("Single-server durable storage must support recurring jobs.", nameof(durableStorage));
                if (durableStorage is not IJobGraphStorage graphDurableStorage)
                        throw new ArgumentException("Single-server durable storage must support batches and continuations.", nameof(durableStorage));

                DurableStorage = durableStorage;
                _recurringDurableStorage = recurringDurableStorage;
                _graphDurableStorage = graphDurableStorage;
                _timeProvider = timeProvider;
                _primary = new(timeProvider);
        }

        /// <summary>The in-process authoritative store.</summary>
        public IJobStorage PrimaryStorage => _primary;

        /// <summary>The durable write-through replica.</summary>
        public IJobStorage DurableStorage { get; }

        /// <inheritdoc />
        public ValueTask InitializeAsync(CancellationToken cancellationToken = default) => EnsureInitializedAsync(cancellationToken);

        /// <inheritdoc />
        public async ValueTask EnqueueAsync(JobRecord job, CancellationToken cancellationToken = default)
        {
                await EnsureInitializedAsync(cancellationToken).ConfigureAwait(false);
                await DurableStorage.EnqueueAsync(job, cancellationToken).ConfigureAwait(false);
                await _primary.EnqueueAsync(job, cancellationToken).ConfigureAwait(false);
        }

        /// <inheritdoc />
        public async ValueTask<IReadOnlyList<JobContinuationEdge>> GetIncomingEdgesAsync(
                IReadOnlyCollection<string> childJobIds,
                CancellationToken cancellationToken = default
        )
        {
                await EnsureInitializedAsync(cancellationToken).ConfigureAwait(false);
                return await _primary.GetIncomingEdgesAsync(childJobIds, cancellationToken).ConfigureAwait(false);
        }

        /// <inheritdoc />
        public async ValueTask EnqueueContinuationAsync(
                JobRecord job,
                IReadOnlyList<JobContinuationEdge> edges,
                CancellationToken cancellationToken = default
        )
        {
                await EnsureInitializedAsync(cancellationToken).ConfigureAwait(false);
                await _graphDurableStorage.EnqueueContinuationAsync(job, edges, cancellationToken).ConfigureAwait(false);
                await _primary.EnqueueContinuationAsync(job, edges, cancellationToken).ConfigureAwait(false);
        }

        /// <inheritdoc />
        public async ValueTask EnqueueBatchAsync(
                JobBatchRecord batch,
                IReadOnlyList<JobRecord> jobs,
                IReadOnlyList<JobContinuationEdge> edges,
                CancellationToken cancellationToken = default
        )
        {
                await EnsureInitializedAsync(cancellationToken).ConfigureAwait(false);
                await _graphDurableStorage.EnqueueBatchAsync(batch, jobs, edges, cancellationToken).ConfigureAwait(false);
                await _primary.EnqueueBatchAsync(batch, jobs, edges, cancellationToken).ConfigureAwait(false);
        }

        /// <inheritdoc />
        public async ValueTask<IReadOnlyList<JobRecord>> AcquireDueJobsAsync(
                JobAcquisitionRequest request,
                CancellationToken cancellationToken = default
        )
        {
                await EnsureInitializedAsync(cancellationToken).ConfigureAwait(false);
                var acquired = await _primary.AcquireDueJobsAsync(request, cancellationToken).ConfigureAwait(false);
                if (acquired.Count == 0)
                        return acquired;

                var replica = (IJobStorageReplica)DurableStorage;
                var replicated = await replica.AcquireJobsAsync(
                        [.. acquired.Select(x => x.Id)],
                        request.WorkerId,
                        request.Lease,
                        cancellationToken
                ).ConfigureAwait(false);
                if (acquired.Count != replicated.Count ||
                        !acquired.Select(x => x.Id).ToHashSet(StringComparer.Ordinal).SetEquals(replicated.Select(x => x.Id)))
                {
                        throw new ImmediateJobException(
                                "The durable job replica has drifted from the authoritative in-memory queue. " +
                                "Single-server mode must not be used by multiple scheduler processes."
                        );
                }

                return acquired;
        }

        /// <inheritdoc />
        public async ValueTask SetExecutionTelemetryAsync(
                string jobId,
                string workerId,
                string? traceId,
                string? spanId,
                DateTimeOffset startedAt,
                CancellationToken cancellationToken = default
        )
        {
                await EnsureInitializedAsync(cancellationToken).ConfigureAwait(false);
                await DurableStorage.SetExecutionTelemetryAsync(
                        jobId,
                        workerId,
                        traceId,
                        spanId,
                        startedAt,
                        cancellationToken
                ).ConfigureAwait(false);
                await _primary.SetExecutionTelemetryAsync(
                        jobId,
                        workerId,
                        traceId,
                        spanId,
                        startedAt,
                        cancellationToken
                ).ConfigureAwait(false);
        }

        /// <inheritdoc />
        public async ValueTask RenewLeaseAsync(
                string jobId,
                string workerId,
                TimeSpan lease,
                CancellationToken cancellationToken = default
        )
        {
                await EnsureInitializedAsync(cancellationToken).ConfigureAwait(false);
                await DurableStorage.RenewLeaseAsync(jobId, workerId, lease, cancellationToken).ConfigureAwait(false);
                await _primary.RenewLeaseAsync(jobId, workerId, lease, cancellationToken).ConfigureAwait(false);
        }

        /// <inheritdoc />
        public async ValueTask CompleteAsync(string jobId, string workerId, CancellationToken cancellationToken = default)
        {
                await EnsureInitializedAsync(cancellationToken).ConfigureAwait(false);
                await DurableStorage.CompleteAsync(jobId, workerId, cancellationToken).ConfigureAwait(false);
                await _primary.CompleteAsync(jobId, workerId, cancellationToken).ConfigureAwait(false);
        }

        /// <inheritdoc />
        public async ValueTask CompleteWithContinuationsAsync(
                string jobId,
                string workerId,
                IReadOnlyList<JobContinuationAddition> additions,
                CancellationToken cancellationToken = default
        )
        {
                await EnsureInitializedAsync(cancellationToken).ConfigureAwait(false);
                await _graphDurableStorage.CompleteWithContinuationsAsync(jobId, workerId, additions, cancellationToken)
                        .ConfigureAwait(false);
                await _primary.CompleteWithContinuationsAsync(jobId, workerId, additions, cancellationToken)
                        .ConfigureAwait(false);
        }

        /// <inheritdoc />
        public async ValueTask AddBatchJobAsync(
                string currentJobId,
                JobRecord job,
                ContinuationOptions options,
                CancellationToken cancellationToken = default
        )
        {
                await EnsureInitializedAsync(cancellationToken).ConfigureAwait(false);
                await _graphDurableStorage.AddBatchJobAsync(currentJobId, job, options, cancellationToken).ConfigureAwait(false);
                await _primary.AddBatchJobAsync(currentJobId, job, options, cancellationToken).ConfigureAwait(false);
        }

        /// <inheritdoc />
        public async ValueTask FailAsync(
                string jobId,
                string workerId,
                string error,
                DateTimeOffset? nextRetryAt,
                CancellationToken cancellationToken = default
        )
        {
                await EnsureInitializedAsync(cancellationToken).ConfigureAwait(false);
                await DurableStorage.FailAsync(jobId, workerId, error, nextRetryAt, cancellationToken).ConfigureAwait(false);
                await _primary.FailAsync(jobId, workerId, error, nextRetryAt, cancellationToken).ConfigureAwait(false);
        }

        /// <inheritdoc />
        public async ValueTask UpsertRecurringAsync(RecurringJobSchedule schedule, CancellationToken cancellationToken = default)
        {
                await EnsureInitializedAsync(cancellationToken).ConfigureAwait(false);
                await _recurringDurableStorage.UpsertRecurringAsync(schedule, cancellationToken).ConfigureAwait(false);
                await _primary.UpsertRecurringAsync(schedule, cancellationToken).ConfigureAwait(false);
        }

        /// <inheritdoc />
        public async ValueTask RemoveObsoleteCodeDefinedRecurringAsync(
                IReadOnlyCollection<string> activeScheduleNames,
                CancellationToken cancellationToken = default
        )
        {
                await EnsureInitializedAsync(cancellationToken).ConfigureAwait(false);
                await _recurringDurableStorage.RemoveObsoleteCodeDefinedRecurringAsync(activeScheduleNames, cancellationToken)
                        .ConfigureAwait(false);
                await _primary.RemoveObsoleteCodeDefinedRecurringAsync(activeScheduleNames, cancellationToken).ConfigureAwait(false);
        }

        /// <inheritdoc />
        public async ValueTask RemoveRecurringAsync(string name, CancellationToken cancellationToken = default)
        {
                await EnsureInitializedAsync(cancellationToken).ConfigureAwait(false);
                await _recurringDurableStorage.RemoveRecurringAsync(name, cancellationToken).ConfigureAwait(false);
                await _primary.RemoveRecurringAsync(name, cancellationToken).ConfigureAwait(false);
        }

        /// <inheritdoc />
        public async ValueTask PauseRecurringAsync(string name, CancellationToken cancellationToken = default)
        {
                await EnsureInitializedAsync(cancellationToken).ConfigureAwait(false);
                await _recurringDurableStorage.PauseRecurringAsync(name, cancellationToken).ConfigureAwait(false);
                await _primary.PauseRecurringAsync(name, cancellationToken).ConfigureAwait(false);
        }

        /// <inheritdoc />
        public async ValueTask ResumeRecurringAsync(string name, CancellationToken cancellationToken = default)
        {
                await EnsureInitializedAsync(cancellationToken).ConfigureAwait(false);
                await _recurringDurableStorage.ResumeRecurringAsync(name, cancellationToken).ConfigureAwait(false);
                await _primary.ResumeRecurringAsync(name, cancellationToken).ConfigureAwait(false);
        }

        /// <inheritdoc />
        public async ValueTask<IReadOnlyList<RecurringJobSchedule>> GetDueRecurringAsync(
                DateTimeOffset now,
                int batchSize,
                CancellationToken cancellationToken = default
        )
        {
                await EnsureInitializedAsync(cancellationToken).ConfigureAwait(false);
                return await _primary.GetDueRecurringAsync(now, batchSize, cancellationToken).ConfigureAwait(false);
        }

        /// <inheritdoc />
        public async ValueTask<bool> MaterializeRecurringAsync(
                RecurringJobSchedule schedule,
                JobRecord job,
                DateTimeOffset nextRunAt,
                CancellationToken cancellationToken = default
        )
        {
                await EnsureInitializedAsync(cancellationToken).ConfigureAwait(false);
                if (!await _recurringDurableStorage.MaterializeRecurringAsync(schedule, job, nextRunAt, cancellationToken).ConfigureAwait(false))
                        return false;
                return await _primary.MaterializeRecurringAsync(schedule, job, nextRunAt, cancellationToken).ConfigureAwait(false);
        }

        /// <inheritdoc />
        public async ValueTask<JobMonitoringSnapshot> GetMonitoringSnapshotAsync(CancellationToken cancellationToken = default)
        {
                await EnsureInitializedAsync(cancellationToken).ConfigureAwait(false);
                return await _primary.GetMonitoringSnapshotAsync(cancellationToken).ConfigureAwait(false);
        }

        /// <inheritdoc />
        public async ValueTask<IReadOnlyList<JobRecord>> QueryJobsAsync(
                JobQuery query,
                CancellationToken cancellationToken = default
        )
        {
                await EnsureInitializedAsync(cancellationToken).ConfigureAwait(false);
                return await _primary.QueryJobsAsync(query, cancellationToken).ConfigureAwait(false);
        }

        /// <inheritdoc />
        public async ValueTask<BatchStatus?> GetBatchStatusAsync(
                string batchId,
                CancellationToken cancellationToken = default
        )
        {
                await EnsureInitializedAsync(cancellationToken).ConfigureAwait(false);
                return await _primary.GetBatchStatusAsync(batchId, cancellationToken).ConfigureAwait(false);
        }

        /// <inheritdoc />
        public async ValueTask<IReadOnlyList<BatchStatus>> QueryBatchesAsync(
                JobBatchQuery query,
                CancellationToken cancellationToken = default
        )
        {
                await EnsureInitializedAsync(cancellationToken).ConfigureAwait(false);
                return await _primary.QueryBatchesAsync(query, cancellationToken).ConfigureAwait(false);
        }

        /// <inheritdoc />
        public async ValueTask<IReadOnlyList<BatchMemberStatus>> QueryBatchMembersAsync(
                string batchId,
                BatchMemberQuery query,
                CancellationToken cancellationToken = default
        )
        {
                await EnsureInitializedAsync(cancellationToken).ConfigureAwait(false);
                return await _primary.QueryBatchMembersAsync(batchId, query, cancellationToken).ConfigureAwait(false);
        }

        /// <inheritdoc />
        public async ValueTask<BatchGraph?> GetBatchGraphAsync(
                string batchId,
                CancellationToken cancellationToken = default
        )
        {
                await EnsureInitializedAsync(cancellationToken).ConfigureAwait(false);
                return await _primary.GetBatchGraphAsync(batchId, cancellationToken).ConfigureAwait(false);
        }

        /// <inheritdoc />
        public async ValueTask<JobStatus?> GetJobStatusAsync(
                string jobId,
                CancellationToken cancellationToken = default
        )
        {
                await EnsureInitializedAsync(cancellationToken).ConfigureAwait(false);
                return await _primary.GetJobStatusAsync(jobId, cancellationToken).ConfigureAwait(false);
        }

        /// <inheritdoc />
        public async ValueTask CancelBatchAsync(string batchId, CancellationToken cancellationToken = default)
        {
                await EnsureInitializedAsync(cancellationToken).ConfigureAwait(false);
                await _graphDurableStorage.CancelBatchAsync(batchId, cancellationToken).ConfigureAwait(false);
                await _primary.CancelBatchAsync(batchId, cancellationToken).ConfigureAwait(false);
        }

        /// <inheritdoc />
        public async ValueTask DeleteBatchAsync(string batchId, CancellationToken cancellationToken = default)
        {
                await EnsureInitializedAsync(cancellationToken).ConfigureAwait(false);
                await _graphDurableStorage.DeleteBatchAsync(batchId, cancellationToken).ConfigureAwait(false);
                await _primary.DeleteBatchAsync(batchId, cancellationToken).ConfigureAwait(false);
        }

        /// <inheritdoc />
        public async ValueTask RetryAsync(string jobId, CancellationToken cancellationToken = default)
        {
                await EnsureInitializedAsync(cancellationToken).ConfigureAwait(false);
                await DurableStorage.RetryAsync(jobId, cancellationToken).ConfigureAwait(false);
                await _primary.RetryAsync(jobId, cancellationToken).ConfigureAwait(false);
        }

        /// <inheritdoc />
        public async ValueTask DeleteAsync(string jobId, CancellationToken cancellationToken = default)
        {
                await EnsureInitializedAsync(cancellationToken).ConfigureAwait(false);
                await DurableStorage.DeleteAsync(jobId, cancellationToken).ConfigureAwait(false);
                await _primary.DeleteAsync(jobId, cancellationToken).ConfigureAwait(false);
        }

        /// <inheritdoc />
        public async ValueTask PurgeJobsAsync(
                TimeSpan succeededRetention,
                TimeSpan failedRetention,
                CancellationToken cancellationToken = default
        )
        {
                await EnsureInitializedAsync(cancellationToken).ConfigureAwait(false);
                await DurableStorage.PurgeJobsAsync(
                        succeededRetention,
                        failedRetention,
                        cancellationToken
                ).ConfigureAwait(false);
                await _primary.PurgeJobsAsync(
                        succeededRetention,
                        failedRetention,
                        cancellationToken
                ).ConfigureAwait(false);
        }

        /// <inheritdoc />
        public async ValueTask PurgeBatchesAsync(
                TimeSpan batchSucceededRetention,
                TimeSpan batchFailedRetention,
                CancellationToken cancellationToken = default
        )
        {
                await EnsureInitializedAsync(cancellationToken).ConfigureAwait(false);
                await _graphDurableStorage.PurgeBatchesAsync(
                        batchSucceededRetention,
                        batchFailedRetention,
                        cancellationToken
                ).ConfigureAwait(false);
                await _primary.PurgeBatchesAsync(
                        batchSucceededRetention,
                        batchFailedRetention,
                        cancellationToken
                ).ConfigureAwait(false);
        }

        /// <inheritdoc />
        public async ValueTask HeartbeatAsync(JobServerSnapshot server, CancellationToken cancellationToken = default)
        {
                await EnsureInitializedAsync(cancellationToken).ConfigureAwait(false);
                await _primary.HeartbeatAsync(server, cancellationToken).ConfigureAwait(false);
        }

        /// <inheritdoc />
        public async ValueTask<bool> IsHealthyAsync(CancellationToken cancellationToken = default)
        {
                await EnsureInitializedAsync(cancellationToken).ConfigureAwait(false);
                return await DurableStorage.IsHealthyAsync(cancellationToken).ConfigureAwait(false);
        }

        /// <inheritdoc />
        public void Dispose() => DisposeAsync().AsTask().GetAwaiter().GetResult();

        /// <inheritdoc />
        public ValueTask DisposeAsync()
        {
                lock (_disposeGate)
                        return new(_disposeTask ??= DisposeCoreAsync());
        }

        private async Task DisposeCoreAsync()
        {
                Volatile.Write(ref _disposeStarted, 1);
                await _initialization.WaitAsync(CancellationToken.None).ConfigureAwait(false);
                try
                {
                        await _primary.DisposeAsync().ConfigureAwait(false);
                        await DurableStorage.DisposeAsync().ConfigureAwait(false);
                }
                finally
                {
                        _ = _initialization.Release();
                }
        }

        private async ValueTask EnsureInitializedAsync(CancellationToken cancellationToken)
        {
                ThrowIfDisposed();
                if (Volatile.Read(ref _initialized))
                        return;

                await _initialization.WaitAsync(cancellationToken).ConfigureAwait(false);
                InMemoryJobStorage? recoveredPrimary = null;
                try
                {
                        ThrowIfDisposed();
                        if (Volatile.Read(ref _initialized))
                                return;

                        await DurableStorage.InitializeAsync(cancellationToken).ConfigureAwait(false);
                        recoveredPrimary = CreatePrimaryStorage();
                        await recoveredPrimary.InitializeAsync(cancellationToken).ConfigureAwait(false);

                        var recoveredJobs = new List<JobRecord>();
                        var recoveredIncomingEdges = new Dictionary<string, List<JobContinuationEdge>>(StringComparer.Ordinal);
                        foreach (var state in Enum.GetValues<JobState>())
                        {
                                var skip = 0;
                                while (true)
                                {
                                        var jobs = await DurableStorage.QueryJobsAsync(
                                                new() { State = state, Skip = skip, Take = RecoveryBatchSize },
                                                cancellationToken
                                        ).ConfigureAwait(false);
                                        recoveredJobs.AddRange(jobs);
                                        var standaloneIds = jobs
                                                .Where(static job => job.BatchId is null)
                                                .Select(static job => job.Id)
                                                .ToArray();
                                        if (standaloneIds.Length != 0)
                                        {
                                                var incomingEdges = await _graphDurableStorage.GetIncomingEdgesAsync(
                                                        standaloneIds,
                                                        cancellationToken
                                                ).ConfigureAwait(false);
                                                var requestedIds = standaloneIds.ToHashSet(StringComparer.Ordinal);
                                                foreach (var edge in incomingEdges)
                                                {
                                                        if (!requestedIds.Contains(edge.ChildJobId))
                                                        {
                                                                throw new ImmediateJobException(
                                                                        $"Durable storage returned an incoming edge for unrequested job '{edge.ChildJobId}'."
                                                                );
                                                        }

                                                        if (!recoveredIncomingEdges.TryGetValue(edge.ChildJobId, out var edges))
                                                                recoveredIncomingEdges.Add(edge.ChildJobId, edges = []);
                                                        edges.Add(edge);
                                                }
                                        }

                                        if (jobs.Count < RecoveryBatchSize)
                                                break;
                                        skip += jobs.Count;
                                }
                        }

                        var batchIds = recoveredJobs
                                .Where(static job => job.BatchId is not null)
                                .Select(static job => job.BatchId!)
                                .Distinct(StringComparer.Ordinal)
                                .ToArray();
                        var recoveredBatches = new Dictionary<string, RecoveredBatch>(batchIds.Length, StringComparer.Ordinal);
                        foreach (var batchId in batchIds)
                        {
                                var status = await _graphDurableStorage.GetBatchStatusAsync(batchId, cancellationToken).ConfigureAwait(false)
                                        ?? throw new ImmediateJobException($"Batch '{batchId}' has members but no durable batch header.");
                                var graph = await _graphDurableStorage.GetBatchGraphAsync(batchId, cancellationToken).ConfigureAwait(false)
                                        ?? throw new ImmediateJobException($"Batch '{batchId}' has members but no durable dependency graph.");
                                recoveredBatches.Add(batchId, new(
                                        new()
                                        {
                                                Id = status.Id,
                                                CreatedAt = status.CreatedAt,
                                                TotalJobs = status.Total,
                                                PendingCount = status.Remaining,
                                                SucceededCount = status.Succeeded,
                                                FailedCount = status.Failed,
                                                CancelledCount = status.Cancelled,
                                                StartedAt = status.StartedAt,
                                                CompletedAt = status.CompletedAt,
                                                State = status.State,
                                        },
                                        [.. recoveredJobs.Where(job => job.BatchId == batchId)],
                                        [.. graph.Edges.Select(ToContinuationEdge)]
                                ));
                        }

                        var restoredBatchIds = new HashSet<string>(StringComparer.Ordinal);
                        while (recoveredBatches.Count != 0)
                        {
                                var ready = recoveredBatches.Values
                                        .Where(batch => batch.Edges
                                                .Where(static edge => edge.ParentBatchId is not null)
                                                .All(edge => restoredBatchIds.Contains(edge.ParentBatchId!)))
                                        .OrderBy(static batch => batch.Record.CreatedAt)
                                        .ThenBy(static batch => batch.Record.Id, StringComparer.Ordinal)
                                        .ToArray();
                                if (ready.Length == 0)
                                {
                                        var unresolved = string.Join(", ", recoveredBatches.Keys.Order(StringComparer.Ordinal));
                                        throw new ImmediateJobException(
                                                $"Durable batches have cyclic or missing parent-batch dependencies: {unresolved}."
                                        );
                                }

                                foreach (var batch in ready)
                                {
                                        await recoveredPrimary.EnqueueBatchAsync(
                                                batch.Record,
                                                batch.Jobs,
                                                batch.Edges,
                                                cancellationToken
                                        ).ConfigureAwait(false);
                                        _ = recoveredBatches.Remove(batch.Record.Id);
                                        _ = restoredBatchIds.Add(batch.Record.Id);
                                }
                        }

                        var restoredJobIds = recoveredJobs
                                .Where(static job => job.BatchId is not null)
                                .Select(static job => job.Id)
                                .ToHashSet(StringComparer.Ordinal);
                        var allRecoveredJobIds = recoveredJobs.Select(static job => job.Id).ToHashSet(StringComparer.Ordinal);
                        var standaloneContinuations = new Dictionary<string, JobRecord>(StringComparer.Ordinal);
                        foreach (var job in recoveredJobs.Where(static job => job.BatchId is null))
                        {
                                if (!recoveredIncomingEdges.TryGetValue(job.Id, out var incomingEdges))
                                {
                                        if (job.State == JobState.AwaitingContinuation || job.RemainingDependencies != 0)
                                        {
                                                throw new ImmediateJobException(
                                                        $"Job '{job.Id}' has continuation dependencies but no durable dependency graph."
                                                );
                                        }

                                        await recoveredPrimary.EnqueueAsync(job, cancellationToken).ConfigureAwait(false);
                                        _ = restoredJobIds.Add(job.Id);
                                }
                                else
                                        standaloneContinuations.Add(job.Id, job);
                        }

                        bool AreContinuationParentsRestored(JobRecord job) => recoveredIncomingEdges[job.Id].All(edge =>
                                (edge.ParentJobId is null || restoredJobIds.Contains(edge.ParentJobId))
                                && (edge.ParentBatchId is null || restoredBatchIds.Contains(edge.ParentBatchId))
                        );

                        while (standaloneContinuations.Count != 0)
                        {
                                var ready = standaloneContinuations.Values
                                        .Where(AreContinuationParentsRestored)
                                        .OrderBy(static job => job.CreatedAt)
                                        .ThenBy(static job => job.Id, StringComparer.Ordinal)
                                        .ToArray();
                                if (ready.Length == 0)
                                {
                                        var missingParents = standaloneContinuations.Values
                                                .SelectMany(job => recoveredIncomingEdges[job.Id])
                                                .Where(edge => edge.ParentJobId is { } parentId && !allRecoveredJobIds.Contains(parentId))
                                                .Select(static edge => edge.ParentJobId!)
                                                .Distinct(StringComparer.Ordinal)
                                                .Order(StringComparer.Ordinal)
                                                .ToArray();
                                        var missingParentBatches = standaloneContinuations.Values
                                                .SelectMany(job => recoveredIncomingEdges[job.Id])
                                                .Where(edge => edge.ParentBatchId is { } parentId && !restoredBatchIds.Contains(parentId))
                                                .Select(static edge => edge.ParentBatchId!)
                                                .Distinct(StringComparer.Ordinal)
                                                .Order(StringComparer.Ordinal)
                                                .ToArray();
                                        var unresolved = string.Join(", ", standaloneContinuations.Keys.Order(StringComparer.Ordinal));
                                        if (missingParents.Length != 0)
                                        {
                                                throw new ImmediateJobException(
                                                        $"Durable standalone continuations reference missing parent jobs: {string.Join(", ", missingParents)}."
                                                );
                                        }

                                        if (missingParentBatches.Length != 0)
                                        {
                                                throw new ImmediateJobException(
                                                        $"Durable standalone continuations reference missing parent batches: {string.Join(", ", missingParentBatches)}."
                                                );
                                        }

                                        throw new ImmediateJobException($"Durable standalone continuations contain a cycle: {unresolved}.");
                                }

                                foreach (var job in ready)
                                {
                                        await recoveredPrimary.EnqueueContinuationAsync(
                                                job,
                                                recoveredIncomingEdges[job.Id],
                                                cancellationToken
                                        ).ConfigureAwait(false);
                                        _ = standaloneContinuations.Remove(job.Id);
                                        _ = restoredJobIds.Add(job.Id);
                                }
                        }

                        var snapshot = await DurableStorage.GetMonitoringSnapshotAsync(cancellationToken).ConfigureAwait(false);
                        foreach (var schedule in snapshot.Recurring)
                                await recoveredPrimary.UpsertRecurringAsync(schedule, cancellationToken).ConfigureAwait(false);

                        var previousPrimary = _primary;
                        _primary = recoveredPrimary;
                        recoveredPrimary = null;
                        await previousPrimary.DisposeAsync().ConfigureAwait(false);
                        Volatile.Write(ref _initialized, true);
                }
                finally
                {
                        if (recoveredPrimary is not null)
                                await recoveredPrimary.DisposeAsync().ConfigureAwait(false);
                        _ = _initialization.Release();
                }
        }

        private void ThrowIfDisposed() =>
                ObjectDisposedException.ThrowIf(Volatile.Read(ref _disposeStarted) != 0, this);

        private static JobContinuationEdge ToContinuationEdge(BatchGraphEdge edge) => new()
        {
                ChildJobId = edge.ChildJobId,
                ParentJobId = edge.ParentJobId,
                ParentBatchId = edge.ParentBatchId,
                Trigger = edge.Trigger,
        };

        private InMemoryJobStorage CreatePrimaryStorage() => new(_timeProvider);

        private sealed record RecoveredBatch(
                JobBatchRecord Record,
                IReadOnlyList<JobRecord> Jobs,
                IReadOnlyList<JobContinuationEdge> Edges
        );
}

ImmediatePlatform / Immediate.Jobs / 30394116826

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