@nivinjoseph/n-eda
Version:
Event Driven Architecture framework
137 lines • 7.3 kB
JavaScript
// import { ApplicationException } from "@nivinjoseph/n-exception";
// import { Delay, Deserializer, Make } from "@nivinjoseph/n-util";
// import { EventRegistration } from "../event-registration";
// import { Consumer } from "./consumer";
// import { ConsumerProfiler } from "./consumer-profiler";
export {};
// export class ProfilingConsumer extends Consumer
// {
// private readonly _profiler = new ConsumerProfiler();
// public get profiler(): ConsumerProfiler { return this._profiler; }
// protected async beginConsume(): Promise<void>
// {
// while (true)
// {
// if (this.isDisposed)
// return;
// try
// {
// this._profiler.fetchPartitionWriteIndexStarted();
// const writeIndex = await this.fetchPartitionWriteIndex();
// this._profiler.fetchPartitionWriteIndexEnded();
// this._profiler.fetchConsumerPartitionReadIndexStarted();
// const readIndex = await this.fetchConsumerPartitionReadIndex();
// this._profiler.fetchConsumerPartitionReadIndexEnded();
// if (readIndex >= writeIndex)
// {
// await Delay.seconds(1);
// continue;
// }
// const maxRead = 50;
// const lowerBoundReadIndex = readIndex + 1;
// const upperBoundReadIndex = (writeIndex - readIndex) > maxRead ? readIndex + maxRead : writeIndex;
// this._profiler.batchRetrieveEventsStarted();
// const eventsData = await this.batchRetrieveEvents(lowerBoundReadIndex, upperBoundReadIndex);
// this._profiler.batchRetrieveEventsEnded();
// for (const item of eventsData)
// {
// if (this.isDisposed)
// return;
// let eventData = item.value;
// let numReadAttempts = 1;
// const maxReadAttempts = 10;
// while (eventData == null && numReadAttempts < maxReadAttempts) // we need to do this to deal with race condition
// {
// if (this.isDisposed)
// return;
// await Delay.milliseconds(100);
// this._profiler.retrieveEventStarted();
// eventData = await this.retrieveEvent(item.index);
// this._profiler.retrieveEventEnded();
// numReadAttempts++;
// }
// if (eventData == null)
// {
// try
// {
// throw new ApplicationException(`Failed to read event data after ${maxReadAttempts} read attempts => Topic=${this.topic}; Partition=${this.partition}; ReadIndex=${item.index};`);
// }
// catch (error)
// {
// await this.logger.logError(error);
// }
// this._profiler.incrementConsumerPartitionReadIndexStarted();
// await this.incrementConsumerPartitionReadIndex();
// this._profiler.incrementConsumerPartitionReadIndexEnded();
// continue;
// }
// this._profiler.decompressEventStarted();
// const event = await this.decompressEvent(eventData);
// this._profiler.decompressEventEnded();
// const eventId = (<any>event).$id || (<any>event).id; // for compatibility with n-domain DomainEvent
// const eventName = (<any>event).$name || (<any>event).name; // for compatibility with n-domain DomainEvent
// const eventRegistration = this.manager.eventMap.get(eventName) as EventRegistration;
// // const deserializedEvent = (<any>eventRegistration.eventType).deserializeEvent(event);
// this._profiler.deserializeEventStarted();
// const deserializedEvent = Deserializer.deserialize(event);
// this._profiler.deserializeEventEnded();
// if (this.trackedIdsSet.has(eventId))
// {
// this._profiler.incrementConsumerPartitionReadIndexStarted();
// await this.incrementConsumerPartitionReadIndex();
// this._profiler.incrementConsumerPartitionReadIndexEnded();
// continue;
// }
// let failed = false;
// try
// {
// this._profiler.eventProcessingStarted(eventName, eventId);
// await Make.retryWithExponentialBackoff(async () =>
// {
// if (this.isDisposed)
// {
// failed = true;
// return;
// }
// try
// {
// await this.processEvent(eventName, eventRegistration, deserializedEvent, eventId);
// }
// catch (error)
// {
// this._profiler.eventRetried(eventName);
// throw error;
// }
// }, 5)();
// this._profiler.eventProcessingEnded(eventName, eventId);
// }
// catch (error)
// {
// failed = true;
// this._profiler.eventFailed(eventName);
// await this.logger.logWarning(`Failed to process event of type '${eventName}' with data ${JSON.stringify(event)} after 5 attempts.`);
// await this.logger.logError(error);
// }
// finally
// {
// if (failed && this.isDisposed)
// return;
// this.track(eventId);
// this._profiler.incrementConsumerPartitionReadIndexStarted();
// await this.incrementConsumerPartitionReadIndex();
// this._profiler.incrementConsumerPartitionReadIndexEnded();
// }
// }
// }
// catch (error)
// {
// await this.logger.logWarning(`Error in consumer => ConsumerGroupId: ${this.manager.consumerGroupId}; Topic: ${this.topic}; Partition: ${this.partition};`);
// await this.logger.logError(error);
// if (this.isDisposed)
// return;
// await Delay.seconds(15);
// }
// }
// }
// }
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