/********************************************************************************
 * Copyright (c) 2021 TypeFox and others.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the Eclipse
 * Public License v. 2.0 are satisfied: GNU General Public License, version 2
 * with the GNU Classpath Exception which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 ********************************************************************************/
import { Action } from './actions';
import { DiagramServer } from './diagram-server';
import { DiagramState } from './diagram-services';
export type ServerActionHandler<A extends Action = Action> = (action: A, state: DiagramState, server: DiagramServer) => void | Promise<void>;
/**
 * Use this service to register handlers to specific actions. The `DiagramServer` queries this registry
 * when an action is received from the client, and falls back to the built-in behavior if no handlers
 * are found.
 */
export declare class ServerActionHandlerRegistry {
    protected readonly handlers: Map<string, ServerActionHandler<Action>[]>;
    /**
     * Returns the action handlers for the given action kind, or `undefined` if there are none.
     */
    getHandler(kind: string): ServerActionHandler[] | undefined;
    /**
     * Add an action handler to be called when an action of the specified kind is received.
     */
    onAction<A extends Action>(kind: string, handler: ServerActionHandler<A>): void;
    /**
     * Remove an action handler that was previously added with `onAction`.
     */
    removeActionHandler<A extends Action>(kind: string, handler: ServerActionHandler<A>): void;
}
//# sourceMappingURL=action-handler.d.ts.map