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3 3  (((
4 -In this microlearning, we will introduce you to the basics of the synchronous messaging pattern within the eMagiz platform. You will gain an understanding of how this pattern operates, its key characteristics, and when it may or may not be the best choice for your integrations.
4 +In this microlearning, we will explain the basics of the synchronous messaging pattern.
5 5  
6 6  Should you have any questions, please get in touch with [[academy@emagiz.com>>mailto:academy@emagiz.com]].
7 7  
8 +* Last update: August 5th, 2021
9 +* Required reading time: 5 minutes
10 +
8 8  == 1. Prerequisites ==
9 9  
10 10  * Intermediate knowledge of the eMagiz platform
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12 12  == 2. Key concepts ==
13 13  
14 14  This microlearning centers around the synchronous messaging pattern in eMagiz.
15 -* By synchronous we mean: The process that processes data and subsequently informs the caller what the status is.
18 +By synchronous, we mean The process that processes data and subsequently informs the caller what the status is.
16 16  
17 17  Key characteristics of synchronous messaging are:
18 18  
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21 21  * Messages have a time limit. The response needs to be back within 25 seconds (eMagiz default)
22 22  * Uses a request-response structure that talks to one system at a time
23 23  
24 -{{info}}In case you want to learn more about asynchronous messaging, please check out this [[microlearning>>doc:Main.eMagiz Academy.Microlearnings.Crash Course.Crash Course Messaging.crashcourse-messaging-messaging-asynchronous||target="blank"]].{{/info}}
25 -
26 26  == 3. Messaging Synchronous ==
27 27  
28 -Synchronous messaging is the less used, the less advised option when implementing a messaging integration via eMagiz. With this approach, the sending party supplies the data to eMagiz via a push mechanism. eMagiz, in turn, places the data on a queue (in most cases an onramp queue). The subsequent process (the onramp) will process the message and will put the message on the next queue (the synchronous routing). That process will route each message to the correct offramp. This process continues until the message eMagiz delivers to the external system. At that point, eMagiz will wait for a response. If that response is received, the message will travel back to the starting point to deliver the reaction to the caller. If something goes wrong, for example, a timeout, the error message is also given back to the caller, and eMagiz will log the exception. If you want to learn more on that, please check out this [[microlearning>>doc:Main.eMagiz Academy.Microlearnings.Intermediate Level.Understanding Error Handling.intermediate-understanding-error-handling-in-emagiz-messaging-synchronous||target="blank"]].
29 +Synchronous messaging is the less used, the less advised option when implementing a messaging integration via eMagiz. In case you want to learn more about asynchronous messaging, please check out this [microlearning](crashcourse-messaging-messaging-asynchronous.md)
29 29  
30 -[[image:Main.Images.Microlearning.WebHome@intermediate-key-concepts-emagiz-messaging-messaging-synchronous--concept.png]]
31 +Key characteristics of synchronous messaging are:
31 31  
32 -Note that this means that when one message is currently being processed, all other messages have to patiently wait until the message is processed as we speak delivered back to the caller. As there is a time constraint on the messages (25 seconds as eMagiz default), you can see why this option is less suitable within the messaging engine. The most pain is felt in the routing. Just as with asynchronous routing, the synchronous routing processes all synchronous messages that pass through your messaging engine. As a result, this means that when one synchronous process is busy, it can even hold up other synchronous processes. The API Gateway pattern is a more suitable alternative for handling the request-response pattern via an integration platform such as eMagiz. If you want to learn more on that, please check out the [[crash course>>doc:Main.eMagiz Academy.Microlearnings.Crash Course.Crash Course API Gateway.WebHome||target="blank"]].
33 +- Blocking. The sender initiates the process and waits for a response before continuing with the following message
34 +- Systems depend on the responses of other systems for their function
35 +- Messages have a time limit. The response needs to be back within 25 seconds (eMagiz default)
36 +- Uses a request-response structure that talks to one system at a time
33 33  
34 -Another aspect of the synchronous messaging pattern to consider is that the system from which you want to retrieve data (or push data to) based on the request made by the caller needs to be online. If it is not online, eMagiz won't receive a response, and the caller cannot continue their work. This fact creates a dependency between systems that could reduce the perceived reliability of your integration solution. With asynchronous messaging, you could take measures to mitigate these risks, such as a retry mechanism.
38 +With this method, the sending party supplies the data to eMagiz via a push mechanism. eMagiz, in turn, places the data on a queue (in most cases an onramp queue). The subsequent process (the onramp) will process the message and will put the message on the next queue (the synchronous routing). That process will route each message to the correct offramp. This process continues until the message eMagiz delivers to the external system. At that point, eMagiz will wait for a response. If that response is received, the message will travel back to the starting point to deliver the reaction to the caller. If something goes wrong, for example, a timeout, the error message is also given back to the caller, and eMagiz will log the exception. If you want to learn more on that, please check out this [[microlearning>>doc:Main.eMagiz Academy.Microlearnings.Intermediate Level.Understanding Error Handling.intermediate-understanding-error-handling-in-emagiz-messaging-synchronous.WebHome||target="blank"]]
35 35  
36 -A third aspect to consider is whether you can set a generic point of entry through which all clients can communicate via eMagiz to many other systems. In those cases, you could look at the API Gateway solution as an alternative to synchronous messaging, as it comes with several benefits. More on the basics of the API Gateway can be found in this [[crash course>>doc:Main.eMagiz Academy.Microlearnings.Crash Course.Crash Course API Gateway.WebHome||target="blank"]].
40 +[[image:Main.Images.Microlearning.WebHome@intermediate-key-concepts-emagiz-messaging-messaging-synchronous--concept.png]]
37 37  
38 -=== 3.1 Practical use case ===
42 +Note that this means that when one message is currently being processed, all other messages have to patiently wait until the message is processed as we speak delivered back to the caller. As there is a time constraint on the messages (25 seconds as eMagiz default), you can see why this option is less suitable within the messaging engine. The most pain is felt in the routing. Just as with asynchronous routing, the synchronous routing processes all synchronous messages that pass through your messaging engine. As a result, this means that when one synchronous process is busy, it can even hold up other synchronous processes. The API Gateway pattern is a more suitable alternative for handling the request-response pattern via an integration platform such as eMagiz. If you want to learn more on that, please check out the [[crashcourse>>doc:Main.eMagiz Academy.Microlearnings.Crash Course.Crash Course API Gateway.WebHome||target="blank"]].
39 39  
40 -A practical use case in which you would most likely want to handle your integration synchronously is the following use case:
44 +Another aspect of the synchronous messaging pattern to consider is that the system from which you want to retrieve data (or push data to) based on the request made by the caller needs to be online. If it is not online, eMagiz won't receive a response, and the caller cannot continue their work. This fact creates a dependency between systems that could reduce the perceived reliability of your integration solution. With asynchronous messaging, you could take measures to mitigate these risks, such as a retry mechanism.
41 41  
42 -Imagine you want to order something at a webshop. After you have selected the product(s), you want to open the payment process to pay. Upon payment, you also need to supply the relevant address information, so the webshop knows where to deliver the product. In doing so, you often see that when you provide your postal code (and house number), the system will automatically fill in the remainder of your address information. This functionality is there for two reasons. Your convenience and because the webshop needs this information to deliver the product you paid for correctly. If the webshop does not know where to deliver the product, the webshop cannot complete the order process. As a result, the webshop needs to send out a request that will promptly be followed by a response (a synchronous call).
46 +A third aspect to consider is whether you can set a generic point of entry through which all clients can communicate via eMagiz to many other systems. In those cases, you could look at the API Gateway solution as an alternative to synchronous messaging, as it comes with several benefits. More on the basics of the API Gateway can be found in this [[crashcourse>>doc:Main.eMagiz Academy.Microlearnings.Crash Course.Crash Course API Gateway.WebHome||target="blank"]].
43 43  
44 -Even in this scenario, most web shops give the user the option to manually fill in the remainder of the information as they know that even when the call fails, the user still needs a way to continue. So in a sense, the webshop has taken the responsibility of handling success and failure responses.
48 +== 4. Assignment ==
45 45  
46 -=== 3.2 Asynchronous vs Synchronous ===
50 +No assignment accompanies this microlearning.
47 47  
48 -The decision to handle an integration process in a specific manner depends on various relevant business and technical checks and balances that should be answered before choosing which integration pattern to choose and then subsequently which alternative method within an integration pattern to choose. If you want more information on how to decide this correctly, please check out this [[microlearning>>doc:Main.eMagiz Academy.Microlearnings.Intermediate Level.Discover your integration landscape.intermediate-discover-your-integration-landscape-determining-integration-pattern||target="blank"]].
52 +== 5. Key takeaways ==
49 49  
50 -{{html}}
51 -<!--
54 +* The key aspects are:
55 + * Entry is the starting point of the integration process in messaging
56 + * Queues are an internal resource of eMagiz
57 + * Outside parties are not allowed to write on eMagiz queues directly
58 + * eMagiz facilitates various connectivity methods (i.e., REST, SOAP, Database, File)
52 52  
53 -== 4. Assignment ==
54 54  
55 -Analyze a synchronous messaging flow from entry to exit and learn what happens within this process.
56 -This assignment can be completed with the help of your (Academy) project you have created/used in the previous assignment.
57 57  
58 --->
59 -{{/html}}
62 +== 6. Suggested Additional Readings ==
60 60  
61 -== 4. Key takeaways ==
64 +If you are interested in this topic, please boost your knowledge with the help of the internet.
62 62  
63 -* Key characteristics of synchronous messaging include:
64 -** Blocking: The sender must wait for a response before proceeding with the next message.
65 -** System dependency: Systems rely on timely responses from others to function effectively.
66 -** Time constraints: Messages have a time limit (25 seconds by default in eMagiz) for receiving a response.
67 -** Request-response structure: Each request is handled by one system at a time.
68 -* The API Gateway pattern is often a better alternative when handling synchronous communication, as it offers more flexibility and mitigates some of the challenges associated with synchronous messaging.
66 +== 7. Silent demonstration video ==
69 69  
70 -== 5. Suggested Additional Readings ==
68 +As this is a more theoretical microlearning, we have no video for this.
71 71  
72 -If you are interested in this topic and want more information on it please read the help text provided by eMagiz and read the following links:
73 -
74 -* [[Crash Course (Menu)>>doc:Main.eMagiz Academy.Microlearnings.Crash Course.WebHome||target="blank"]]
75 -** [[Crash Course Messaging (Navigation)>>doc:Main.eMagiz Academy.Microlearnings.Crash Course.Crash Course Messaging.WebHome||target="blank"]]
76 -*** [[Messaging Asynchronous (Explanation)>>doc:Main.eMagiz Academy.Microlearnings.Crash Course.Crash Course Messaging.crashcourse-messaging-messaging-asynchronous||target="blank"]]
77 -** [[Crash Course API Gateway (Navigation)>>doc:Main.eMagiz Academy.Microlearnings.Crash Course.Crash Course API Gateway.WebHome||target="blank"]]
78 -* [[Intermediate Level (Menu)>>doc:Main.eMagiz Academy.Microlearnings.Intermediate Level.WebHome||target="blank"]]
79 -** [[Discover your integration landscape (Navigation)>>doc:Main.eMagiz Academy.Microlearnings.Intermediate Level.Discover your integration landscape.WebHome||target="blank"]]
80 -*** [[Determining Integration Pattern (Explanation)>>doc:Main.eMagiz Academy.Microlearnings.Intermediate Level.Discover your integration landscape.intermediate-discover-your-integration-landscape-determining-integration-pattern||target="blank"]]
81 -** [[Understanding Error Handling (Navigation)>>doc:Main.eMagiz Academy.Microlearnings.Intermediate Level.Understanding Error Handling.WebHome||target="blank"]]
82 -*** [[Error Handling in Messaging Synchronous (Explanation)>>doc:Main.eMagiz Academy.Microlearnings.Intermediate Level.Understanding Error Handling.intermediate-understanding-error-handling-in-emagiz-messaging-synchronous||target="blank"]]
83 -* [[Messaging Synchronous (Search Results)>>url:https://docs.emagiz.com/bin/view/Main/Search?sort=score&sortOrder=desc&highlight=true&facet=true&r=1&f_space_facet=0%2FMain.&l_space_facet=10&f_type=DOCUMENT&f_locale=en&f_locale=&f_locale=en&text=%22messaging+synchronous%22||target="blank"]]
84 84  )))
85 85  
86 86  ((({{toc/}}))){{/container}}