Unclear concrete advantage of message-based vs. event-based systems
There is this quote in the book "Reactive Design Patterns", listing it as an advantage of having the consumer responsible for processing its own incoming messages in a message-passing system:
Sequential processing enables the response to an event to depend on the current state of the consumer. So, previous events can have an influence on the consumer’s behavior. A callback-based scheme, in contrast, requires the consumer to decide what its response will be when it subscribes to the event, not when the event occurs.
I don't really understand it. I don't see how that approach is superior to a callback-based scheme, as the quote says. What keeps the callback from reacting differently at the moment the event occurs? If the logic to handle events differently is inside the callback, why wouldn't that be an option?
event-handling akka reactive-programming message-passing
asked Nov 23 '18 at 9:33
GiantSquid
6,67772838
add a comment |
There is this quote in the book "Reactive Design Patterns", listing it as an advantage of having the consumer responsible for processing its own incoming messages in a message-passing system:
Sequential processing enables the response to an event to depend on the current state of the consumer. So, previous events can have an influence on the consumer’s behavior. A callback-based scheme, in contrast, requires the consumer to decide what its response will be when it subscribes to the event, not when the event occurs.
I don't really understand it. I don't see how that approach is superior to a callback-based scheme, as the quote says. What keeps the callback from reacting differently at the moment the event occurs? If the logic to handle events differently is inside the callback, why wouldn't that be an option?
event-handling akka reactive-programming message-passing
asked Nov 23 '18 at 9:33
GiantSquid
6,67772838
"A callback-based scheme... requires the consumer to decide what its response will be when it subscribes to the event, not when the event occurs" This is not true.
– Alexei Kaigorodov
Nov 23 '18 at 10:28
add a comment |
There is this quote in the book "Reactive Design Patterns", listing it as an advantage of having the consumer responsible for processing its own incoming messages in a message-passing system:
Sequential processing enables the response to an event to depend on the current state of the consumer. So, previous events can have an influence on the consumer’s behavior. A callback-based scheme, in contrast, requires the consumer to decide what its response will be when it subscribes to the event, not when the event occurs.
I don't really understand it. I don't see how that approach is superior to a callback-based scheme, as the quote says. What keeps the callback from reacting differently at the moment the event occurs? If the logic to handle events differently is inside the callback, why wouldn't that be an option?
event-handling akka reactive-programming message-passing
asked Nov 23 '18 at 9:33
GiantSquid
6,67772838
There is this quote in the book "Reactive Design Patterns", listing it as an advantage of having the consumer responsible for processing its own incoming messages in a message-passing system:
Sequential processing enables the response to an event to depend on the current state of the consumer. So, previous events can have an influence on the consumer’s behavior. A callback-based scheme, in contrast, requires the consumer to decide what its response will be when it subscribes to the event, not when the event occurs.
I don't really understand it. I don't see how that approach is superior to a callback-based scheme, as the quote says. What keeps the callback from reacting differently at the moment the event occurs? If the logic to handle events differently is inside the callback, why wouldn't that be an option?
event-handling akka reactive-programming message-passing
event-handling akka reactive-programming message-passing
asked Nov 23 '18 at 9:33
GiantSquid
6,67772838
asked Nov 23 '18 at 9:33
GiantSquid
6,67772838
asked Nov 23 '18 at 9:33
GiantSquid
6,67772838
asked Nov 23 '18 at 9:33
GiantSquid
6,67772838
asked Nov 23 '18 at 9:33
GiantSquid
6,67772838
6,67772838
"A callback-based scheme... requires the consumer to decide what its response will be when it subscribes to the event, not when the event occurs" This is not true.
– Alexei Kaigorodov
Nov 23 '18 at 10:28
add a comment |
"A callback-based scheme... requires the consumer to decide what its response will be when it subscribes to the event, not when the event occurs" This is not true.
– Alexei Kaigorodov
Nov 23 '18 at 10:28
"A callback-based scheme... requires the consumer to decide what its response will be when it subscribes to the event, not when the event occurs" This is not true.
– Alexei Kaigorodov
Nov 23 '18 at 10:28
"A callback-based scheme... requires the consumer to decide what its response will be when it subscribes to the event, not when the event occurs" This is not true.
– Alexei Kaigorodov
Nov 23 '18 at 10:28
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%2f53443962%2funclear-concrete-advantage-of-message-based-vs-event-based-systems%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.
Some of your past answers have not been well-received, and you're in danger of being blocked from answering.
Please pay close attention to the following guidance:
- 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%2f53443962%2funclear-concrete-advantage-of-message-based-vs-event-based-systems%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
"A callback-based scheme... requires the consumer to decide what its response will be when it subscribes to the event, not when the event occurs" This is not true.
– Alexei Kaigorodov
Nov 23 '18 at 10:28