joynr.capabilities.ParticipantIdStorage.js Maven / Gradle / Ivy

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/*jslint es5: true, nomen: true, node: true */

/*
 * #%L
 * %%
 * Copyright (C) 2011 - 2017 BMW Car IT GmbH
 * %%
 * 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.
 * #L%
 */

/**
 * @constructor
 * @name ParticipantIdStorage
 *
 * @param {Persistency} persistency - the persistence object to be used to store the participantIds
 * @param {Function} uuid - a function generating a uuid string
 */
function ParticipantIdStorage(persistency, uuid) {
    this._persistency = persistency;
    this._uuid = uuid;
}

/**
 * @function
 * @name ParticipantIdStorage#getParticipantId
 *
 * @param {String}
 *            domain
 * @param {Object}
 *            provider
 * @param {String}
 *            provider.interfaceName
 *
 * @returns {String} the retrieved or generated participantId
 */
ParticipantIdStorage.prototype.getParticipantId = function getParticipantId(domain, provider) {
    var key = "joynr.participant." + domain + "." + provider.interfaceName;
    var participantId = this._persistency.getItem(key);
    if (!participantId) {
        participantId = this._uuid();
        this._persistency.setItem(key, participantId);
    }
    return participantId;
};

module.exports = ParticipantIdStorage;