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Exercise 35 - Refactored #148

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155 changes: 73 additions & 82 deletions index.html
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Original file line number Diff line number Diff line change
Expand Up @@ -4206,100 +4206,91 @@ <h4>Exercise 35: Sequencing HTTP requests with callbacks</h4>
</ol>
<textarea class="code" rows="60" cols="80">
function(window, $, showMovieLists, showError) {
var error,
configDone,
movieLists,
queueList,
windowLoaded,
outputDisplayed,
errorHandler = function() {
// Otherwise show the error.
error = "There was a connectivity error";

// We may be ready to display out
tryToDisplayOutput();
},
tryToDisplayOutput = function() {
if (outputDisplayed) {
return;
}
if (windowLoaded) {
if (configDone && movieLists !== undefined) {
if (queueList !== undefined) {
movieLists.push(queueList);
}
outputDisplayed = true;
showMovieLists(JSON.stringify(movieLists));
}
else if (error) {
outputDisplayed = true;
showError(error);
}
}
},
windowLoadHandler = function() {
windowLoaded = true;
var error, configDone, movieLists,
queueList, windowLoaded, outputDisplayed;

// Remember to unsubscribe from events
window.removeEventListener("load", windowLoadHandler);
var hostUrl = "http://api-global.netflix.com/";

// This may be the last task we're waiting on, so try and display output.
tryToDisplayOutput();
};
function errorHandler() {
// Otherwise show the error.
error = "There was a connectivity error:";
// We may be ready to display out
tryToDisplayOutput();
}

function tryToDisplayOutput() {
// Wait for window. Output once.
if (!windowLoaded || outputDisplayed) return;

// Wait for both parallel requests
// member's config and movie list.
if (!configDone || !movieLists) {
// Only if something is missing check for an error instead.
if(!error) return;
outputDisplayed = true;
return showError(error);
}
// If queue list has been requested, append it to result
if (queueList) movieLists.push(queueList);
outputDisplayed = true;
showMovieLists(JSON.stringify(movieLists));
}

function windowLoadHandler() {
windowLoaded = true;
// Remember to unsubscribe from events
window.removeEventListener("load", windowLoadHandler);
// This may be the last task we're waiting on
// so try and display output.
tryToDisplayOutput();
}

// Register for the load event
window.addEventListener("load", windowLoadHandler);

// Request the service url prefix for the users AB test
$.getJSON(
"http://api-global.netflix.com/abTestInformation",
{
success: function(abTestInformation) {
// Request the member's config information to determine whether their instant
// queue should be displayed.
$.getJSON(
"http://api-global.netflix.com/" + abTestInformation.urlPrefix + "/config",
{
success: function(config) {
// Parallel retrieval of movie list could've failed,
// in which case we don't want to issue this call.
if (!error) {
// If we're supposed to
if (config.showInstantQueue) {
$.getJSON(
"http://api-global.netflix.com/" + abTestInformation.urlPrefix + "/queue",
{
success: function(queueMessage) {
queueList = queueMessage.list;

configDone = true;
tryToDisplayOutput();
},
error: errorHandler
});
}
else {
configDone = true;
tryToDisplayOutput();
}
}
},
error: errorHandler
});
$.getJSON( hostUrl + "abTestInformation", {
success: function(abTestInformation) {
var servicePath = hostUrl + abTestInformation.urlPrefix + '/';

// Request the member's config information to determine
// whether their instant queue should be displayed.
$.getJSON(servicePath + "config", {
success: function(config) {
// Parallel retrieval of movie list could've failed,
// in which case we don't want to issue this call.
if (error) return

// If we're not supposed to
if (!config.showInstantQueue) {
configDone = true;
tryToDisplayOutput();
return
}

// Retrieve the movie list
$.getJSON(
"http://api-global.netflix.com/" + abTestInformation.urlPrefix + "/movieLists",
{
success: function(movieListMessage) {
movieLists = movieListMessage.list;
$.getJSON(servicePath + "queue", {
success: function(queueMessage) {
queueList = queueMessage.list;
configDone = true;
tryToDisplayOutput();
},
error: errorHandler
});
},
error: errorHandler
});
},
error: errorHandler
});

// Retrieve the movie list
$.getJSON(servicePath + "movieLists", {
success: function(movieListMessage) {
movieLists = movieListMessage.list;
tryToDisplayOutput();
},
error: errorHandler
});
},
error: errorHandler
});
}
</textarea>
<button class="go">Run</button>
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