<div dir="ltr"><div class="markdown-here-wrapper" style=""><blockquote style="margin:1.2em 0px;border-left:4px solid rgb(221,221,221);padding:0px 1em;color:rgb(119,119,119);quotes:none">
<p style="margin:0px 0px 1.2em!important"> but I would just create something like this on top of STS</p>
</blockquote>
<p style="margin:0px 0px 1.2em!important">Definitely possible (and it is how I made my PoC), but the point I was trying to make is that there should be some base TaskScope that does not touch the other constructs and for other constructs we should use a different StructuredTask implementation.<br>One can easily implement <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">StructuredTask.lambdaScopedBuilder(...)</code> (name in progress) which works as Eric’s example.</p>
<p style="margin:0px 0px 1.2em!important">Now that I re-read the mailing chain I realised that my <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">StructuredTask.stream</code> is not what Eric talked about, but I still stand by my point that if we add such a construct to the API, it should be separated from the “basic” one.</p>
<blockquote style="margin:1.2em 0px;border-left:4px solid rgb(221,221,221);padding:0px 1em;color:rgb(119,119,119);quotes:none">
<p style="margin:0px 0px 1.2em!important">If you have a working implementation of something like this, I would be curious to see it</p>
</blockquote>
<p style="margin:0px 0px 1.2em!important">Unfortunately I only have a partial implementation at the moment, and it is sitting in a closed network. I will try to get it out/rewrite it and upload it to git to share it when I can.</p>
<blockquote style="margin:1.2em 0px;border-left:4px solid rgb(221,221,221);padding:0px 1em;color:rgb(119,119,119);quotes:none">
<p style="margin:0px 0px 1.2em!important">Though I suspect an actual implementation has to go through some iterations</p>
</blockquote>
<p style="margin:0px 0px 1.2em!important">Definitely, in the actual API I have apart from <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">flatFork</code> also <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">fork</code> (obviously), <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">forkMulti</code>, <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">flatFanIn</code> (see bellow) (I didn’t implement <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">fanInMulti</code> yet, but conceptually it is there, although a bit more tricky to implement because of short-circuit), <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">exit</code> (anly accessible after <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">flatFanIn</code>, you put a condition based on number of iterations and time for when to short-circuit the <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">fanIn</code> mod), <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">joinAll</code> (equivalent to the standard <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">StructuredTaskScope</code>), <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">joinTillFirst</code> (equivalent to <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">ShutdownOnSuccess</code>), <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">joinTillFailure</code> (equivalent to <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">ShutdownOnFailure</code>) and <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">start</code> (start can be called only after one of the <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">joinX</code> was called). After a “start” call, you are left with a normal stream</p>
<p style="margin:0px 0px 1.2em!important">The API is certainly not perfect and is more of a PoC (e.g. it always saves the results and the exceptions in fanOut mod, and never in fanIn mod, apart maybe from the last task finished), also apart from heavy pipe-lines I prefer to not use this style of coding, so I never actually planned to promote this from PoC.</p>
<p style="margin:0px 0px 1.2em!important">To handle situations like you described I made the <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">fanIn</code> mod, which basically just runs repeatedly till the <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">exit</code> condition is met or is called to exit from one of the subtasks in creates:</p>
<pre style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;font-size:1em;line-height:1.2em;margin:1.2em 0px"><code class="hljs language-java" style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline;white-space:pre;overflow:auto;border-radius:3px;border:1px solid rgb(204,204,204);padding:0.5em 0.7em;display:block!important;display:block;overflow-x:auto;padding:0.5em;color:rgb(51,51,51);background:rgb(248,248,248)">StructuredTask.streamBuilder() <span class="hljs-comment" style="color:rgb(153,153,136);font-style:italic">// in actuality it is not part of "StructuredTask"</span>
.flatFanIn(() -> serverSocket.accept())
.exit((count, time, absoluteTime) -> ...) <span class="hljs-comment" style="color:rgb(153,153,136);font-style:italic">// count is the number of "events" fired, "time" is time since last "event", "absoluteTime" is time since entering "fanIn" mod</span>
.fork(ctx -> ...) <span class="hljs-comment" style="color:rgb(153,153,136);font-style:italic">//in "fanIn" mod fork has a "context" of the mod, which allows an individual task to access it's `count, time, absoluteTime` as well as exiting the mod</span>
.joinAll()
.start(); <span class="hljs-comment" style="color:rgb(153,153,136);font-style:italic">// empty stream, because it is fanIn mod</span>
</code></pre>
<blockquote style="margin:1.2em 0px;border-left:4px solid rgb(221,221,221);padding:0px 1em;color:rgb(119,119,119);quotes:none">
<p style="margin:0px 0px 1.2em!important">And also compare how particular cases would compare against <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">Stream</code>, because your example looks like more of a candidate of parallel <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">Stream</code></p>
</blockquote>
<p style="margin:0px 0px 1.2em!important">It is a similar API to a stream, it is also structured concurrency.</p>
<p style="margin:0px 0px 1.2em!important">It also has nothing (okay, maybe not <b>nothing</b>) to do with parallel stream apart from the similar function call chaining, the semantics of “parallel stream” in Java is that the parallelism works together in completing a transformation on the input (as evidenced by the <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">reduce</code>and <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">collect</code> methods), and in general in the <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">Stream</code> interface there are a lot of methods that doesn’t make sense for the StructuredTaskStream</p>
<p style="margin:0px 0px 1.2em!important">On Fri, May 19, 2023 at 10:43 PM Attila Kelemen <a href="http://mailto:attila.kelemen85@gmail.com">attila.kelemen85@gmail.com</a> wrote:</p>
<p style="margin:0px 0px 1.2em!important"></p><div class="markdown-here-exclude"><p></p><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">><br>
> Attila (and still Eric)<br>
> It seems like both of you don’t like the TWR part, but I find it extremely nice to have, and a lot of times prefer it over a lambda argument.<br>
> TWR allows us to propagate checked exceptions, which till we add union-types in generic levels is impossible to do with lambdas, and it doesn’t have the (justified) restrictions of lambdas.<br>
<br>
I'm not really against having the TWR way available as a low level<br>
construct, I just like to have these lambda blocks as utility to which<br>
you resort to (although tbh, it is a bit strange that scoped values<br>
give you lambda block only, while STS only TWR). Of course, checked<br>
exceptions are a nightmare in these constructs, and that is why I<br>
usually have `UnsafeFunction<T, E extends Throwable>` (and its<br>
gazillion siblings) around (and I'm pretty sure there are many-many<br>
people creating their own "Unsafe" function interfaces). In an idea<br>
world we could have constructs similar to Kotlin's inline functions,<br>
which would solve this issue (fingers crossed for it :))<br>
<br>
><br>
> var results = StructuredTask.StreamBuilder()<br>
> .value<String>("USERNAME", "duke")<br>
> .flatFork(() -> Stream.of(workers))<br>
> .join()<br>
> .throwIfFailed() // "StructuredTask.Stream" doesn't need a "strategy" because it exposes functions like this instead<br>
> .map(Subtask::get) // "structured" comes into play here, you can't call terminating operators without first calling "join"<br>
> .toList();<br>
><br>
<br>
This could be nice actually, but I would just create something like<br>
this on top of STS, since an API like this could easily end up with<br>
unwanted limitation. If you have a working implementation of something<br>
like this, I would be curious to see it. Though I suspect an actual<br>
implementation has to go through some iterations (at least, when I'm<br>
designing APIs like this, I always have to seriously review my<br>
original idea). In this idea - for example - I can't see how you would<br>
do a conditional termination of starting new workers in a loop. For<br>
example, if this was a server waiting for TCP connections, and then it<br>
needed to fork new tasks for each incoming connection, I'm not sure<br>
how that would look. And also compare how particular cases would<br>
compare against `Stream`, because your example looks like more of a<br>
candidate of parallel `Stream`.<br>
</blockquote><p></p></div><p style="margin:0px 0px 1.2em!important"></p>
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