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[Code Style] Use prototypes in persistence bundles
WTD-1482
This commit is contained in:
Victor Woeltjen
@ -42,154 +42,108 @@ define(
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* instance.
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* @memberof platform/persistence/couch
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* @constructor
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* @implements {PersistenceService}
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* @param $http Angular's $http service
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* @param $interval Angular's $interval service
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* @param {string} space the name of the persistence space being served
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* @param {string} path the path to the CouchDB instance
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*/
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function CouchPersistenceProvider($http, $q, SPACE, PATH) {
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var spaces = [ SPACE ],
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revs = {};
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// Convert a subpath to a full path, suitable to pass
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// to $http.
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function url(subpath) {
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return PATH + '/' + subpath;
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}
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// Issue a request using $http; get back the plain JS object
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// from the expected JSON response
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function request(subpath, method, value) {
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return $http({
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method: method,
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url: url(subpath),
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data: value
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}).then(function (response) {
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return response.data;
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}, function () {
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return undefined;
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});
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}
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// Shorthand methods for GET/PUT methods
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function get(subpath) {
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return request(subpath, "GET");
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}
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function put(subpath, value) {
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return request(subpath, "PUT", value);
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}
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// Pull out a list of document IDs from CouchDB's
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// _all_docs response
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function getIdsFromAllDocs(allDocs) {
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return allDocs.rows.map(function (r) { return r.id; });
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}
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// Get a domain object model out of CouchDB's response
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function getModel(response) {
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if (response && response.model) {
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revs[response[ID]] = response[REV];
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return response.model;
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} else {
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return undefined;
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}
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}
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// Check the response to a create/update/delete request;
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// track the rev if it's valid, otherwise return false to
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// indicate that the request failed.
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function checkResponse(response) {
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if (response && response.ok) {
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revs[response.id] = response.rev;
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return response.ok;
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} else {
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return false;
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}
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}
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return {
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/**
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* List all persistence spaces which this provider
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* recognizes.
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*
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* @returns {Promise.<string[]>} a promise for a list of
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* spaces supported by this provider
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* @memberof platform/persistence/couch.CouchPersistenceProvider#
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*/
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listSpaces: function () {
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return $q.when(spaces);
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},
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/**
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* List all objects (by their identifiers) that are stored
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* in the given persistence space, per this provider.
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* @param {string} space the space to check
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* @returns {Promise.<string[]>} a promise for the list of
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* identifiers
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* @memberof platform/persistence/couch.CouchPersistenceProvider#
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*/
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listObjects: function (space) {
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return get("_all_docs").then(getIdsFromAllDocs);
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},
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/**
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* Create a new object in the specified persistence space.
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* @param {string} space the space in which to store the object
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* @param {string} key the identifier for the persisted object
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* @param {object} value a JSONifiable object that should be
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* stored and associated with the provided identifier
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* @returns {Promise.<boolean>} a promise for an indication
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* of the success (true) or failure (false) of this
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* operation
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* @memberof platform/persistence/couch.CouchPersistenceProvider#
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*/
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createObject: function (space, key, value) {
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return put(key, new CouchDocument(key, value))
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.then(checkResponse);
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},
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/**
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* Read an existing object back from persistence.
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* @param {string} space the space in which to look for
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* the object
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* @param {string} key the identifier for the persisted object
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* @returns {Promise.<object>} a promise for the stored
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* object; this will resolve to undefined if no such
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* object is found.
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* @memberof platform/persistence/couch.CouchPersistenceProvider#
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*/
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readObject: function (space, key) {
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return get(key).then(getModel);
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},
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/**
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* Update an existing object in the specified persistence space.
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* @param {string} space the space in which to store the object
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* @param {string} key the identifier for the persisted object
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* @param {object} value a JSONifiable object that should be
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* stored and associated with the provided identifier
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* @returns {Promise.<boolean>} a promise for an indication
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* of the success (true) or failure (false) of this
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* operation
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* @memberof platform/persistence/couch.CouchPersistenceProvider#
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*/
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updateObject: function (space, key, value) {
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return put(key, new CouchDocument(key, value, revs[key]))
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.then(checkResponse);
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},
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/**
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* Delete an object in the specified persistence space.
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* @param {string} space the space from which to delete this
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* object
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* @param {string} key the identifier of the persisted object
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* @param {object} value a JSONifiable object that should be
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* deleted
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* @returns {Promise.<boolean>} a promise for an indication
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* of the success (true) or failure (false) of this
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* operation
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* @memberof platform/persistence/couch.CouchPersistenceProvider#
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*/
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deleteObject: function (space, key, value) {
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return put(key, new CouchDocument(key, value, revs[key], true))
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.then(checkResponse);
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}
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};
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function CouchPersistenceProvider($http, $q, space, path) {
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this.spaces = [ space ];
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this.revs = {};
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this.$q = $q;
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this.$http = $http;
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this.path = path;
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}
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function bind(fn, thisArg) {
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return function () {
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return fn.apply(thisArg, arguments);
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};
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}
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// Pull out a list of document IDs from CouchDB's
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// _all_docs response
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function getIdsFromAllDocs(allDocs) {
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return allDocs.rows.map(function (r) { return r.id; });
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}
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// Check the response to a create/update/delete request;
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// track the rev if it's valid, otherwise return false to
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// indicate that the request failed.
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function checkResponse(response) {
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if (response && response.ok) {
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this.revs[response.id] = response.rev;
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return response.ok;
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} else {
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return false;
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}
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}
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// Get a domain object model out of CouchDB's response
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function getModel(response) {
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if (response && response.model) {
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this.revs[response[ID]] = response[REV];
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return response.model;
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} else {
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return undefined;
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}
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}
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// Issue a request using $http; get back the plain JS object
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// from the expected JSON response
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CouchPersistenceProvider.prototype.request = function (subpath, method, value) {
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return this.$http({
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method: method,
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url: this.path + '/' + subpath,
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data: value
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}).then(function (response) {
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return response.data;
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}, function () {
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return undefined;
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});
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};
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// Shorthand methods for GET/PUT methods
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CouchPersistenceProvider.prototype.get = function (subpath) {
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return this.request(subpath, "GET");
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};
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CouchPersistenceProvider.prototype.put = function (subpath, value) {
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return this.request(subpath, "PUT", value);
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};
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CouchPersistenceProvider.prototype.listSpaces = function () {
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return this.$q.when(this.spaces);
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};
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CouchPersistenceProvider.prototype.listObjects = function (space) {
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return this.get("_all_docs").then(bind(getIdsFromAllDocs, this));
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};
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CouchPersistenceProvider.prototype.createObject = function (space, key, value) {
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return this.put(key, new CouchDocument(key, value))
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.then(bind(checkResponse, this));
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};
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CouchPersistenceProvider.prototype.readObject = function (space, key) {
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return this.get(key).then(bind(getModel, this));
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};
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CouchPersistenceProvider.prototype.updateObject = function (space, key, value) {
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var rev = this.revs[key];
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return this.put(key, new CouchDocument(key, value, rev))
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.then(bind(checkResponse, this));
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};
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CouchPersistenceProvider.prototype.deleteObject = function (space, key, value) {
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var rev = this.revs[key];
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return this.put(key, new CouchDocument(key, value, rev, true))
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.then(bind(checkResponse, this));
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};
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return CouchPersistenceProvider;
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}
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);
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