angular-cached-resource/lib/read_cache.js

An AngularJS module to interact with RESTful resources, even when browser is offline

// Generated by CoffeeScript 1.10.0
var modifyObjectInPlace, processReadArgs, readCache;

processReadArgs = require('./process_read_args');

modifyObjectInPlace = require('./modify_object_in_place');

module.exports = readCache = function($q, providerParams, name, CachedResource, actionConfig) {
  var ResourceCacheEntry;
  ResourceCacheEntry = require('./resource_cache_entry')(providerParams);
  return function() {
    var cacheDeferred, cacheEntry, httpDeferred, instance, params, readHttp, ref;
    ref = processReadArgs($q, arguments), params = ref.params, cacheDeferred = ref.deferred;
    httpDeferred = $q.defer();
    instance = new CachedResource({
      $promise: cacheDeferred.promise,
      $httpPromise: httpDeferred.promise
    });
    cacheEntry = new ResourceCacheEntry(CachedResource.$key, params).load();
    readHttp = function() {
      var resource;
      resource = CachedResource.$resource[name].call(CachedResource.$resource, params);
      resource.$promise.then(function(httpResponse) {
        modifyObjectInPlace(instance, httpResponse);
        if (!cacheEntry.value) {
          cacheDeferred.resolve(instance);
        }
        httpDeferred.resolve(instance);
        if (cacheEntry.dirty) {
          providerParams.$log.error("unexpectedly setting a clean entry (load) over a dirty entry (pending write)");
        }
        return cacheEntry.set(httpResponse, false);
      });
      return resource.$promise["catch"](function(error) {
        if (!cacheEntry.value) {
          cacheDeferred.reject(error);
        }
        return httpDeferred.reject(error);
      });
    };
    if (cacheEntry.dirty) {
      CachedResource.$writes.processResource(params, readHttp);
    } else if (!actionConfig.cacheOnly) {
      readHttp();
    }
    if (cacheEntry.value) {
      angular.extend(instance, cacheEntry.value);
      cacheDeferred.resolve(instance);
    } else if (actionConfig.cacheOnly) {
      cacheDeferred.reject(new Error("Cache value does not exist for params", params));
    }
    return instance;
  };
};