futoin-eventstream/GenFace.js

Neutral event stream interface

'use strict';

/**
 * @file
 *
 * Copyright 2017 FutoIn Project (https://futoin.org)
 * Copyright 2017 Andrey Galkin <andrey@futoin.org>
 *
 * 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.
 */

const _defaults = require( 'lodash/defaults' );

const { SPEC_DIRS } = require( '@futoin/specs' );
const { PingFace } = require( 'futoin-invoker' );
const { FTN18_VERSION, PING_VERSION } = require( './common' );


/**
 * Event Stream - Generator Face
 */
class GenFace extends PingFace {
    /**
     * Latest supported FTN17 version
     */
    static get LATEST_VERSION() {
        return FTN18_VERSION;
    }

    /**
     * Latest supported FTN4 version
     */
    static get PING_VERSION() {
        return PING_VERSION;
    }

    /**
     * CCM registration helper
     * @param {AsyncSteps} as - steps interface
     * @param {AdvancedCCM} ccm - CCM instance
     * @param {string} name - CCM registration name
     * @param {any} endpoint - see AdvancedCCM#register
     * @param {any} [credentials] - see AdvancedCCM#register
     * @param {object} [options] - interface options
     * @param {string} [options.version] - interface version to use
     */
    static register( as, ccm, name, endpoint, credentials=null, options={} ) {
        const ifacever = options.version || this.LATEST_VERSION;

        _defaults( options, {
            nativeImpl: this,
            specDirs: this.spec(),
            sendOnBehalfOf: false,
        } );

        ccm.register(
            as,
            name,
            `futoin.evt.gen:${ifacever}`,
            endpoint,
            credentials,
            options,
        );
    }

    static spec() {
        return SPEC_DIRS;
    }
}

module.exports = GenFace;