Exemplo n.º 1
0
        /// <summary>
        /// Replay all events since the last snapshot.
        /// </summary>
        /// <returns>
        /// A <see cref="Task"/> representing the work performed.
        /// </returns>
        public async Task ReplayUnappliedEvents()
        {
            if (!this.IsBeingReplayed)
            {
                try
                {
                    this.IsBeingReplayed = true;
                    var currentEventId = this.LastJournaledEventId;
                    await this.journal.ReadFrom(currentEventId).ForEachAsync(
                        async @event =>
                    {
                        // Update internal state.
                        if (@event.EventId > this.LastJournaledEventId)
                        {
                            this.LastJournaledEventId = @event.EventId;
                        }

                        // Deserialize the event.
                        var request = SerializationManager.DeserializeFromByteArray <MethodInvocation>(@event.Event);

                        // Apply the event.
                        await GrainExecutionHelper.ApplyRequest(this.grain, request);
                    });
                }
                finally
                {
                    this.IsBeingReplayed = false;
                }
            }
        }
Exemplo n.º 2
0
        /// <summary>
        /// Journal the current request.
        /// </summary>
        /// <returns>
        /// The <see cref="Task"/>.
        /// </returns>
        public async Task WriteJournal()
        {
            if (!this.IsBeingReplayed)
            {
                if (++this.journaledSinceLastSnapshot % this.journalWritesBetweenSnapshots == 0)
                {
                    await this.WriteSnapshot();
                }

                var currentRequest = GrainExecutionHelper.CurrentRequest(this.grain);
                if (currentRequest != null)
                {
                    var bytes       = SerializationManager.SerializeToByteArray(currentRequest);
                    var nextEventId = this.LastJournaledEventId + 1;
                    await this.journal.Append(bytes, nextEventId);

                    this.LastJournaledEventId = nextEventId;
                }
            }
        }