pg-transactional-outbox/dist/polling/strategies/batch-size-strategy.d.ts

A PostgreSQL based transactional outbox and inbox pattern implementation to support exactly once message processing (with at least once message delivery).

import { FullPollingListenerConfig } from '../config';
/**
 * Define the batch size strategy how many messages should be loaded at once.
 */
export interface PollingListenerBatchSizeStrategy {
    /**
     * Defines the number of records that should be loaded from the database table.
     * @param currentlyProcessed The number of currently processed messages
     * @returns The max number of records to load
     */
    (currentlyProcessed: number): Promise<number>;
}
/**
 * The default batch size strategy returns the configured value from the
 * `nextMessagesBatchSize`. But the first few times until the batch size is
 * reached it will tell to return only one message. This protects against
 * poisonous messages: if the full batch size would be taken during startup all
 * those messages would be marked as poisonous if one of them fails.
 */
export declare const defaultPollingListenerBatchSizeStrategy: (config: FullPollingListenerConfig) => PollingListenerBatchSizeStrategy;
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