Showing Revision 5 created 05/25/2016 by Udacity Robot.

1. Title:
   Testing Announcements - Developing Scalable Apps with Java
2. Description:

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   So I'm running my app now on localhost. And
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   you'll see, if you look in the APIs Explorer,
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   and drill down in to the functions in the
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   conference API, that the set announcement method is not here.
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   That's because we didn't expose it as an endpoints
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   function. Instead, we defined it as a servlet on
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   purpose, to keep it internal to the application. So
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    the APIs Explorer let's you explore endpoint functions, but it
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    doesn't let you explore your servlets. Since we're going to
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    put things into memcache, I've deployed my app to app
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    spot so I can use the memcache viewer. First, I'll
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    make sure I have some conferences that are nearly sold out.
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    Okay, this one's pretty close to being sold out. Only
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    three seats left. This one's only got one seat left. Okay,
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    so I've got a couple of conferences that only have
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    a couple of seats left. To test the new set announcement
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    function, you can use the browser to go to the
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    URL mapped to the servlet. However, you do have to be
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    logged in as a developer on the application or you'll
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    get an error that you're not in the required role. And
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    that's because we don't want just any old person coming
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    along, setting the announcements by going to the URL in the
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    browser. So to trigger the set announcement function, we go
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    to the URL that we mapped it to in the servlet,
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    in this case which is crons/set_announcment. So we
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    go to the URL. Crons_\set announcement. Nothing seems to
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    happen. But actually that's expected. Remember that the servlet
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    doesn't set a response so nothing happens in the
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    page, and if you've got to the place where it asks you to log in and you
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    go ahead and log in you're going to remain on
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    the log in page even when the URL executes.
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    However, we can use a memcache viewer to check
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    that the announcement got set. So here in the memcache
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    viewer we do see that we have one item. We
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    can use the content lookup section to look to see
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    if it is our announcement. The key we use
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    with recent announcements is a Java String, so let's display
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    it, see if we have an announcement. And yes, we
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    do. So the announcement about the conferences that have been
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    nearly sold out has been created and saved in memcache.
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    So now, we can save values in memcache and we
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    can use a memcache viewer to get those values back.
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    We're going to want to show this announcement to other people, not
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    to the developers of the application. Let's go ahead and
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    create an endpoint function to get the announcement out of Memcache
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    so we can show it to other people. So another
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    thing I want to mention is that in the constants class,
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    constants.java, we define the key for the
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    announcements, and this is where we get the
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    recent announcements key from. So in the conference
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    API class you can define the get announcement
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    function. This is going to be an end points function so this is a fairly simple
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    function. Basically get some memcache service, and then
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    calls the get method on the memcache service,
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    passing in the announcement key. We check if the value is null. So long as it's
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    not null, we create a new announcement object,
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    and we set the message property to the announcement
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    that we got out of memcache. And again,
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    we have to return an announcement, rather than
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    just a string, because this is an endpoint
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    function. And end point functions can't return just strings.