import { FDv2SourceResult } from './FDv2SourceResult';
/**
 * Interface for an asynchronous data source initializer.
 *
 * An initializer runs once and produces a single result. If successful, the
 * result contains a change set with flag data. If it fails, the result
 * contains a status describing the error.
 *
 * Once `run()` resolves, the initializer is complete and should not be
 * called again. Use `close()` to cancel a pending run.
 *
 * ```
 *     [START]
 *        │
 *        ▼
 *   ┌─────────┐
 *   │ RUNNING │──┐
 *   └─────────┘  │
 *    │  │  │  │  └──► SHUTDOWN ──► [END]
 *    │  │  │  └─────► INTERRUPTED ──► [END]
 *    │  │  └────────► CHANGESET ──► [END]
 *    │  └───────────► TERMINAL_ERROR ──► [END]
 *    └──────────────► GOODBYE ──► [END]
 * ```
 */
export interface Initializer {
    /**
     * Run the initializer to completion.
     *
     * This method is intended to be called only a single time for an instance.
     * @returns The result of the initializer.
     */
    run(): Promise<FDv2SourceResult>;
    /**
     * Close the initializer. If `run()` is in progress, it will resolve with
     * a shutdown result.
     */
    close(): void;
}
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