import { SystemEvent } from '../event';
/**
 * ** System Event Dispatcher.
 *
 *   - This Class is start point to trigger SystemEvent.
 *   - SystemEvent identifier is in string format, and would be nice those string to be assigned to constant for easier usage.
 *   - Payload could be any format but preferable is Literal Object.
 *   - SystemEvents could be dispatched in two ways using implemented behavior:
 *
 *   1) POST - this is NON-BLOCKING execution that leverages `setTimeout(handler, 0)` to avoid blocking main JavaScript thread.
 *
 *   2) SEND - this is BLOCKING execution that leverages `Promise` mechanism to chain Handlers execution. At the end returns
 *               flow of execution to Invoker.
 *
 *   - Handlers and their usage read at Decorators JSDoc {@link SystemEventHandlerClass} {@link SystemEventHandler}.
 *
 * @see SystemEventDispatcher.post
 * @see SystemEventDispatcher.send
 *
 * @example
 *    // void
 *    SystemEventDispatcher
 *        .post('SE_Send_Email', { email: 'taurus-shared@vmware.com });
 *
 *    // returns Promise
 *    SystemEventDispatcher
 *        .send('SE_Create_Job', { jobName: 'Test', jobCreator: 'System' })
 *        .then((v) => {
 *          // Do something
 *        });
 */
export declare class SystemEventDispatcher {
    /**
     * ** Method to post System Event.
     *
     *   - NON-BLOCKING execution.
     *   - Execution is non-blocking, e.g. it is executed in queue using setTimeout of 0.
     *   - If third parameters is provided it will execute as many handlers as it is request.
     *      - e.g. 1 or 2 or N and will skip the others.
     */
    static post(eventId: SystemEvent, payload: any, handlersToExecute?: number): void;
    /**
     * ** Method to send System Event.
     *
     *   - BLOCKING execution.
     *   - Execution is blocking, e.g. it is achieved using Promises, and every handler must return Promise.
     *   - If third parameters is provided it will execute as many handlers as it is request.
     *      - e.g. 1 or 2 or N and will return the flow to the invoker.
     */
    static send(eventId: SystemEvent, payload: any, handlersToExecute?: number): Promise<boolean>;
    /**
     * ** Execute send command and handle Promises from handlers.
     */
    private static executeSendCommand;
    /**
     * ** Execute Expression filter for Handler before execution.
     */
    private static executeExpressionFilter;
}