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/**
* ============LICENSE_START========================================================================
* ONAP : ccsdk feature sdnr wt odlux
* =================================================================================================
* Copyright (C) 2019 highstreet technologies GmbH Intellectual Property. All rights reserved.
* =================================================================================================
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
* in compliance with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the License
* is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
* or implied. See the License for the specific language governing permissions and limitations under
* the License.
* ============LICENSE_END==========================================================================
*/
import { Event } from "../common/event"
import { Action } from './action';
import { IActionHandler } from './action';
const LogLevel = +(localStorage.getItem('log.odlux.framework.flux.store') || 0);
export interface Dispatch {
<TAction extends Action>(action: TAction): TAction;
}
export interface Enhancer<TStoreState> {
(store: Store<TStoreState>): Dispatch;
}
class InitializationAction extends Action { };
const initializationAction = new InitializationAction();
export class Store<TStoreState> {
constructor(actionHandler: IActionHandler<TStoreState>, enhancer?: Enhancer<TStoreState>)
constructor(actionHandler: IActionHandler<TStoreState>, initialState: TStoreState, enhancer?: Enhancer<TStoreState>)
constructor(actionHandler: IActionHandler<TStoreState>, initialState?: TStoreState | Enhancer<TStoreState>, enhancer?: Enhancer<TStoreState>) {
if (typeof initialState === 'function') {
enhancer = initialState as Enhancer<TStoreState>;
initialState = undefined;
}
this._isDispatching = false;
this.changed = new Event<void>();
this._actionHandler = actionHandler;
this._state = initialState as TStoreState;
if (enhancer) this._dispatch = enhancer(this);
this._dispatch(initializationAction);
}
public changed: Event<void>;
private _dispatch: Dispatch = <TAction extends Action>(payload: TAction): TAction => {
if (LogLevel > 2) {
console.log('Store::Dispatch - ', payload);
}
if (payload == null || !(payload instanceof Action)) {
throw new Error(
'Actions must inherit from type Action. ' +
'Use a custom middleware for async actions.'
);
}
if (this._isDispatching) {
throw new Error('ActionHandler may not dispatch actions.');
}
const oldState = this._state;
try {
this._isDispatching = true;
this._state = this._actionHandler(oldState, payload);
} finally {
this._isDispatching = false;
}
if (this._state !== oldState) {
if (LogLevel > 3) {
console.log('Store::Dispatch - state has changed', this._state);
}
this.changed.invoke();
}
return payload;
}
public get dispatch(): Dispatch {
return this._dispatch;
}
public get state() {
return this._state
}
private _state: TStoreState;
private _isDispatching: boolean;
private _actionHandler: IActionHandler<TStoreState>;
}
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