/**
 * Domain Interface: IDeadLetterQueue
 * Contract for dead letter queue implementations
 */
import { LogEntry } from '../entities/LogEntry';
export interface IDeadLetterQueue {
    /**
     * Add a log entry to the dead letter queue
     * @param entry Log entry that failed to send
     * @param reason Reason for failure
     */
    add(entry: LogEntry, reason: string): Promise<DLQAddResult>;
    /**
     * Add multiple entries to DLQ in a single batch
     */
    addBatch(entries: LogEntry[], reason: string): Promise<DLQAddResult>;
    /**
     * Attempt to flush entries from DLQ
     */
    flush(): Promise<number>;
    /**
     * Get current size of DLQ
     */
    size(): number;
    /**
     * Clear all entries from DLQ
     */
    clear(): Promise<void>;
    /**
     * Get entries (for retry or inspection)
     */
    getEntries(limit?: number): Promise<Array<{
        entry: LogEntry;
        reason: string;
        timestamp: number;
    }>>;
    /**
     * Queue statistics
     */
    getStats(): DeadLetterQueueStats;
}
export interface DLQAddResult {
    added: number;
    dropped: number;
}
export interface DeadLetterQueueStats {
    size: number;
    droppedEntries: number;
}
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