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Filename : service.js
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"use strict";
module.exports = Service;

// extends Namespace
var Namespace = require("./namespace");
((Service.prototype = Object.create(Namespace.prototype)).constructor = Service).className = "Service";

var Method = require("./method"),
    util   = require("./util"),
    rpc    = require("./rpc");

/**
 * Constructs a new service instance.
 * @classdesc Reflected service.
 * @extends NamespaceBase
 * @constructor
 * @param {string} name Service name
 * @param {Object.<string,*>} [options] Service options
 * @throws {TypeError} If arguments are invalid
 */
function Service(name, options) {
    Namespace.call(this, name, options);

    /**
     * Service methods.
     * @type {Object.<string,Method>}
     */
    this.methods = {}; // toJSON, marker

    /**
     * Cached methods as an array.
     * @type {Method[]|null}
     * @private
     */
    this._methodsArray = null;
}

/**
 * Service descriptor.
 * @interface IService
 * @extends INamespace
 * @property {Object.<string,IMethod>} methods Method descriptors
 */

/**
 * Constructs a service from a service descriptor.
 * @param {string} name Service name
 * @param {IService} json Service descriptor
 * @returns {Service} Created service
 * @throws {TypeError} If arguments are invalid
 */
Service.fromJSON = function fromJSON(name, json) {
    var service = new Service(name, json.options);
    /* istanbul ignore else */
    if (json.methods)
        for (var names = Object.keys(json.methods), i = 0; i < names.length; ++i)
            service.add(Method.fromJSON(names[i], json.methods[names[i]]));
    if (json.nested)
        service.addJSON(json.nested);
    service.comment = json.comment;
    return service;
};

/**
 * Converts this service to a service descriptor.
 * @param {IToJSONOptions} [toJSONOptions] JSON conversion options
 * @returns {IService} Service descriptor
 */
Service.prototype.toJSON = function toJSON(toJSONOptions) {
    var inherited = Namespace.prototype.toJSON.call(this, toJSONOptions);
    var keepComments = toJSONOptions ? Boolean(toJSONOptions.keepComments) : false;
    return util.toObject([
        "options" , inherited && inherited.options || undefined,
        "methods" , Namespace.arrayToJSON(this.methodsArray, toJSONOptions) || /* istanbul ignore next */ {},
        "nested"  , inherited && inherited.nested || undefined,
        "comment" , keepComments ? this.comment : undefined
    ]);
};

/**
 * Methods of this service as an array for iteration.
 * @name Service#methodsArray
 * @type {Method[]}
 * @readonly
 */
Object.defineProperty(Service.prototype, "methodsArray", {
    get: function() {
        return this._methodsArray || (this._methodsArray = util.toArray(this.methods));
    }
});

function clearCache(service) {
    service._methodsArray = null;
    return service;
}

/**
 * @override
 */
Service.prototype.get = function get(name) {
    return this.methods[name]
        || Namespace.prototype.get.call(this, name);
};

/**
 * @override
 */
Service.prototype.resolveAll = function resolveAll() {
    var methods = this.methodsArray;
    for (var i = 0; i < methods.length; ++i)
        methods[i].resolve();
    return Namespace.prototype.resolve.call(this);
};

/**
 * @override
 */
Service.prototype.add = function add(object) {

    /* istanbul ignore if */
    if (this.get(object.name))
        throw Error("duplicate name '" + object.name + "' in " + this);

    if (object instanceof Method) {
        this.methods[object.name] = object;
        object.parent = this;
        return clearCache(this);
    }
    return Namespace.prototype.add.call(this, object);
};

/**
 * @override
 */
Service.prototype.remove = function remove(object) {
    if (object instanceof Method) {

        /* istanbul ignore if */
        if (this.methods[object.name] !== object)
            throw Error(object + " is not a member of " + this);

        delete this.methods[object.name];
        object.parent = null;
        return clearCache(this);
    }
    return Namespace.prototype.remove.call(this, object);
};

/**
 * Creates a runtime service using the specified rpc implementation.
 * @param {RPCImpl} rpcImpl RPC implementation
 * @param {boolean} [requestDelimited=false] Whether requests are length-delimited
 * @param {boolean} [responseDelimited=false] Whether responses are length-delimited
 * @returns {rpc.Service} RPC service. Useful where requests and/or responses are streamed.
 */
Service.prototype.create = function create(rpcImpl, requestDelimited, responseDelimited) {
    var rpcService = new rpc.Service(rpcImpl, requestDelimited, responseDelimited);
    for (var i = 0, method; i < /* initializes */ this.methodsArray.length; ++i) {
        var methodName = util.lcFirst((method = this._methodsArray[i]).resolve().name).replace(/[^$\w_]/g, "");
        rpcService[methodName] = util.codegen(["r","c"], util.isReserved(methodName) ? methodName + "_" : methodName)("return this.rpcCall(m,q,s,r,c)")({
            m: method,
            q: method.resolvedRequestType.ctor,
            s: method.resolvedResponseType.ctor
        });
    }
    return rpcService;
};