Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>I don't think this is possible in Java, but I've managed to put together a simple Scala version. You can still use Java for all other parts of you project.</p> <p>But be aware that it's just a crude demo, focussing on the "simultaneous up- and download" part and ignoring everything else. I'm not even sure that this is the <em>right</em> way to do it, but it seems to work.</p> <p>Basically, what you want to do is to use <code>Concurrent.broadcast</code> to create a input/output stream pair. The output part (<code>Enumeratee</code>) is streamed to the client. Then, you need a custom <code>PartHandler</code> which takes the uploaded data as it arrives, and feeds it into the the input part (<code>Concurrent.Channel</code>).</p> <p>Please not that, in order for this example to work, you have to go to the download page first, <strong>then</strong> start uploading a file. </p> <h2>sample Application.scala</h2> <pre><code>package controllers import play.api._ import libs.iteratee.{Enumerator, Input, Iteratee, Concurrent} import play.api.mvc._ import scala.collection.concurrent object Application extends Controller { val streams = new concurrent.TrieMap[String,(Enumerator[Array[Byte]], Concurrent.Channel[Array[Byte]])] def index = Action { Ok(views.html.index()) } def download(id: String) = Action { val (fileStream, fileInput) = Concurrent.broadcast[Array[Byte]] streams += id -&gt; (fileStream, fileInput) Ok.stream { fileStream.onDoneEnumerating(streams -= id) } } def upload = Action(parse.multipartFormData(myPartHandler)) { request =&gt; Ok("banana!") } def myPartHandler: BodyParsers.parse.Multipart.PartHandler[MultipartFormData.FilePart[Result]] = { parse.Multipart.handleFilePart { case parse.Multipart.FileInfo(partName, filename, contentType) =&gt; val (thisStream, thisInput) = streams(partName) Iteratee.fold[Array[Byte], Concurrent.Channel[Array[Byte]]](thisInput) { (inp, data) =&gt; inp.push(data) inp }.mapDone { inp =&gt; inp.push(Input.EOF) Ok("upload Done") } } } } </code></pre> <h2>sample index.scala.html</h2> <pre><code>&lt;p&gt; &lt;a href="@routes.Application.download("123456")"&gt;Download&lt;/a&gt; &lt;/p&gt; &lt;form action="@routes.Application.upload" method="post" enctype="multipart/form-data"&gt; &lt;input type="file" name="123456"&gt; &lt;input type="submit"&gt; &lt;/form&gt; </code></pre>
    singulars
    1. This table or related slice is empty.
    1. POPossible to use Java NIO in Play 2 framework to POST and GET files simultaneously?
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USCarsten
    1. USCarsten
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POPossible to use Java NIO in Play 2 framework to POST and GET files simultaneously?
      singulars
      1. PTQuestion
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTAcceptedByOriginator
    1. COThanks for your help. I haven't upgraded to Play 2.1 yet, but I got it to work using the post you shared with PipedInputStream and PipedOutputStream. I will definitely try Concurrent.broadcast once I use Play 2.1.
      singulars
      1. PO
      1. UScoolsuntraveler
    2. COin my implementation, Play will start buffering the data if sending occurs before receiving. Does it happen in your implementation? Do you know of anyway to tell Play to block sending? My ideal behavior is for sending to start first, but Play will block it. Once the receiving side starts receiving, sending will start uploading. I tried tweaking chunk size of enumerator and pipe size of PipedInputStream, but it didn't help.
      singulars
      1. PO
      1. UScoolsuntraveler
    3. COYou can start sending, as long as there's an appropriate entry in the `streams` Map. In my example, it's just created on the downloader's side, but you could as well check on both sides if it already exists, and if it doesn't, create it. But again: my example just focuses on the streaming stuff. You really need to implement checks like this one, and also if there are multiple people uploading to or downloading from the same `id`.
      singulars
      1. PO
      1. USCarsten
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload