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'use strict';
/**
* @ngdoc object
* @name angular.module.NG.$xhr.cache
* @function
*
* @requires $xhr.bulk
* @requires $defer
* @requires $xhr.error
* @requires $log
*
* @description
* Acts just like the {@link angular.module.NG.$xhr $xhr} service but caches responses for `GET`
* requests. All cache misses are delegated to the $xhr service.
*
* @property {function()} delegate Function to delegate all the cache misses to. Defaults to
* the {@link angular.module.NG.$xhr $xhr} service.
* @property {object} data The hashmap where all cached entries are stored.
*
* @param {string} method HTTP method.
* @param {string} url Destination URL.
* @param {(string|Object)=} post Request body.
* @param {function(number, (string|Object))} success Response success callback.
* @param {function(number, (string|Object))=} error Response error callback.
* @param {boolean=} [verifyCache=false] If `true` then a result is immediately returned from cache
* (if present) while a request is sent to the server for a fresh response that will update the
* cached entry. The `success` function will be called when the response is received.
* @param {boolean=} [sync=false] in case of cache hit execute `success` synchronously.
*/
function $XhrCacheProvider() {
this.$get = ['$xhr.bulk', '$defer', '$xhr.error', '$log',
function($xhr, $defer, $error, $log) {
var inflight = {};
function cache(method, url, post, success, error, verifyCache, sync) {
if (isFunction(post)) {
if (!isFunction(success)) {
verifyCache = success;
sync = error;
error = null;
} else {
sync = verifyCache;
verifyCache = error;
error = success;
}
success = post;
post = null;
} else if (!isFunction(error)) {
sync = verifyCache;
verifyCache = error;
error = null;
}
if (method == 'GET') {
var data, dataCached;
if ((dataCached = cache.data[url])) {
if (sync) {
success(200, copy(dataCached.value));
} else {
$defer(function() { success(200, copy(dataCached.value)); });
}
if (!verifyCache)
return;
}
if ((data = inflight[url])) {
data.successes.push(success);
data.errors.push(error);
} else {
inflight[url] = {successes: [success], errors: [error]};
cache.delegate(method, url, post,
function(status, response) {
if (status == 200)
cache.data[url] = {value: response};
var successes = inflight[url].successes;
delete inflight[url];
forEach(successes, function(success) {
try {
(success||noop)(status, copy(response));
} catch(e) {
$log.error(e);
}
});
},
function(status, response) {
var errors = inflight[url].errors,
successes = inflight[url].successes;
delete inflight[url];
forEach(errors, function(error, i) {
try {
if (isFunction(error)) {
error(status, copy(response));
} else {
$error(
{method: method, url: url, data: post, success: successes[i]},
{status: status, body: response});
}
} catch(e) {
$log.error(e);
}
});
});
}
} else {
cache.data = {};
cache.delegate(method, url, post, success, error);
}
}
cache.data = {};
cache.delegate = $xhr;
return cache;
}];
}
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