Create sub graph from Source and Sink of each element
I am trying to create a flow or graph with Akka Streams where I am having an input of FtpFile (from Alpakka) which I would like to save to a local file (with FileIO.toFile) and once it is done I would like to emit the path to the local file.
So essentially I am starting with a Source<FtpFile, ?>. When I download a file I can map each FtpFile from the source to a Source<ByteString, ?> which is the source of bytes for this file. For each FtpFile I can also create a Sink<ByteString, ?> on a local path.
I have tried to create an image illustrating the flow:
The idea of the box is that the inner part is some sort of a subflow and it should only continue once the inner flow is completed. As indicated the Download File step in the flow creates a Source<ByteString>. I am facing problems creating a graph that is accepting elements of type FtpFile, and for each element creates its own Sink<ByteString> where it can run the source to. This sink needs to be specific for each upstream element.
java akka akka-stream
asked Nov 12 '18 at 13:52
Yanick SalzmannYanick Salzmann
304115
add a comment |
I am trying to create a flow or graph with Akka Streams where I am having an input of FtpFile (from Alpakka) which I would like to save to a local file (with FileIO.toFile) and once it is done I would like to emit the path to the local file.
So essentially I am starting with a Source<FtpFile, ?>. When I download a file I can map each FtpFile from the source to a Source<ByteString, ?> which is the source of bytes for this file. For each FtpFile I can also create a Sink<ByteString, ?> on a local path.
I have tried to create an image illustrating the flow:
The idea of the box is that the inner part is some sort of a subflow and it should only continue once the inner flow is completed. As indicated the Download File step in the flow creates a Source<ByteString>. I am facing problems creating a graph that is accepting elements of type FtpFile, and for each element creates its own Sink<ByteString> where it can run the source to. This sink needs to be specific for each upstream element.
java akka akka-stream
asked Nov 12 '18 at 13:52
Yanick SalzmannYanick Salzmann
304115
add a comment |
I am trying to create a flow or graph with Akka Streams where I am having an input of FtpFile (from Alpakka) which I would like to save to a local file (with FileIO.toFile) and once it is done I would like to emit the path to the local file.
So essentially I am starting with a Source<FtpFile, ?>. When I download a file I can map each FtpFile from the source to a Source<ByteString, ?> which is the source of bytes for this file. For each FtpFile I can also create a Sink<ByteString, ?> on a local path.
I have tried to create an image illustrating the flow:
The idea of the box is that the inner part is some sort of a subflow and it should only continue once the inner flow is completed. As indicated the Download File step in the flow creates a Source<ByteString>. I am facing problems creating a graph that is accepting elements of type FtpFile, and for each element creates its own Sink<ByteString> where it can run the source to. This sink needs to be specific for each upstream element.
java akka akka-stream
asked Nov 12 '18 at 13:52
Yanick SalzmannYanick Salzmann
304115
I am trying to create a flow or graph with Akka Streams where I am having an input of FtpFile (from Alpakka) which I would like to save to a local file (with FileIO.toFile) and once it is done I would like to emit the path to the local file.
So essentially I am starting with a Source<FtpFile, ?>. When I download a file I can map each FtpFile from the source to a Source<ByteString, ?> which is the source of bytes for this file. For each FtpFile I can also create a Sink<ByteString, ?> on a local path.
I have tried to create an image illustrating the flow:
The idea of the box is that the inner part is some sort of a subflow and it should only continue once the inner flow is completed. As indicated the Download File step in the flow creates a Source<ByteString>. I am facing problems creating a graph that is accepting elements of type FtpFile, and for each element creates its own Sink<ByteString> where it can run the source to. This sink needs to be specific for each upstream element.
java akka akka-stream
java akka akka-stream
asked Nov 12 '18 at 13:52
Yanick SalzmannYanick Salzmann
304115
asked Nov 12 '18 at 13:52
Yanick SalzmannYanick Salzmann
304115
asked Nov 12 '18 at 13:52
Yanick SalzmannYanick Salzmann
304115
asked Nov 12 '18 at 13:52
Yanick SalzmannYanick Salzmann
304115
asked Nov 12 '18 at 13:52
Yanick SalzmannYanick Salzmann
304115
304115
add a comment |
add a comment |
0
active
oldest
votes
Your Answer
StackExchange.ifUsing("editor", function ()
StackExchange.using("externalEditor", function ()
StackExchange.using("snippets", function ()
StackExchange.snippets.init();
);
);
, "code-snippets");
StackExchange.ready(function()
var channelOptions =
tags: "".split(" "),
id: "1"
;
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function()
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled)
StackExchange.using("snippets", function()
createEditor();
);
else
createEditor();
);
function createEditor()
StackExchange.prepareEditor(
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader:
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
,
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
);
);
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53263623%2fcreate-sub-graph-from-source-and-sink-of-each-element%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
0
active
oldest
votes
0
active
oldest
votes
active
oldest
votes
active
oldest
votes
Thanks for contributing an answer to Stack Overflow!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53263623%2fcreate-sub-graph-from-source-and-sink-of-each-element%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
