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1 -Messaging Synchronous
1 +intermediate-key-concepts-emagiz-messaging-entry-not-a-queue
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1 -Main.eMagiz Academy.Microlearnings.Intermediate Level.Key concepts eMagiz Messaging.WebHome
1 +WebHome
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1 -XWiki.dfirdausy
1 +XWiki.marijn
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1 -en
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1 -{{container}}
2 -{{container layoutStyle="columns"}}
3 -(((
4 -In this microlearning, we will explain the basics of the synchronous messaging pattern.
1 +{{html wiki="true"}}
2 +<div class="ez-academy">
3 + <div class="ez-academy_body">
5 5  
6 -Should you have any questions, please get in touch with [[academy@emagiz.com>>mailto:academy@emagiz.com]].
5 +<div class="doc">
7 7  
8 -== 1. Prerequisites ==
9 9  
10 -* Intermediate knowledge of the eMagiz platform
11 11  
12 -== 2. Key concepts ==
9 += Entry, not a queue =
13 13  
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.
11 +In this microlearning, we will explore what the function of the entry is within the message engine. Furthermore, we will explain why there is no entry queue.
16 16  
17 -Key characteristics of synchronous messaging are:
13 +Should you have any questions, please get in touch with academy@emagiz.com.
18 18  
19 -* Blocking. The sender initiates the process and waits for a response before continuing with the following message
20 -* Systems depend on the responses of other systems for their function
21 -* Messages have a time limit. The response needs to be back within 25 seconds (eMagiz default)
22 -* Uses a request-response structure that talks to one system at a time
15 +* Last update: August 5th, 2021
16 +* Required reading time: 5 minutes
23 23  
24 -== 3. Messaging Synchronous ==
18 +== 1. Prerequisites ==
25 25  
26 -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>>doc:Main.eMagiz Academy.Microlearnings.Crash Course.Crash Course Messaging.crashcourse-messaging-messaging-asynchronous||target="blank"]].
20 +* Intermediate knowledge of the eMagiz platform
27 27  
28 -Key characteristics of synchronous messaging are:
22 +== 2. Key concepts ==
29 29  
30 -* Blocking. The sender initiates the process and waits for a response before continuing with the following message
31 -* Systems depend on the responses of other systems for their function
32 -* Messages have a time limit. The response needs to be back within 25 seconds (eMagiz default)
33 -* Uses a request-response structure that talks to one system at a time
24 +This microlearning centers on the concept of entry, not a queue.
34 34  
35 -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||target="blank"]].
26 +* The key aspects are:
27 + * Entry is the starting point of the integration process in messaging
28 + * Queues are an internal resource of eMagiz
29 + * Outside parties are not allowed to write on eMagiz queues directly
30 + * eMagiz facilitates various connectivity methods (i.e., REST, SOAP, Database, File)
36 36  
37 -[[image:Main.Images.Microlearning.WebHome@intermediate-key-concepts-emagiz-messaging-messaging-synchronous--concept.png]]
38 38  
39 -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"]].
40 40  
41 -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.
34 +== 3. Entry, not a queue ==
42 42  
43 -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"]].
36 +In this microlearning, we will explore what the function of the entry is within the message engine. Furthermore, we will explain why there is no entry queue.
44 44  
45 -=== 3.1 Practical use case ===
38 +* The key aspects are:
39 + * Entry is the starting point of the integration process in messaging
40 + * Queues are an internal resource of eMagiz
41 + * Outside parties are not allowed to write on eMagiz queues directly
42 + * eMagiz facilitates various connectivity methods (i.e., REST, SOAP, Database, File)
46 46  
47 -A practical use case in which you would most likely want to handle your integration synchronously is the following use case:
44 +As you learned from the introductory course on messaging, we use a five-layer approach to handle data within the messaging engine. The first layer the data encounters is the entry. The goal of the entry is twofold. One is to establish a connection with an external system. The other is to place data on a queue. There are two ways to establish connectivity. The first method is via a pull mechanism. This pull mechanism means that eMagiz will initiate the communication to retrieve data. The second method is a push mechanism. This push mechanism means that eMagiz will patiently wait till the external system offers data to eMagiz. The push mechanism will typically be realized with the help of a hosted web service (REST or SOAP) within your eMagiz solution.
48 48  
49 -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 +Since the goal of the entry is connectivity between the external system and eMagiz, you could argue that it would be easy to let them place the data on the queue. However, things are not that easy. There are several reasons why this is not a best practice:
50 50  
51 -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 +* This would mean that the external system directly needs to connect to the infra layer (the JMS) and will have the option to read and write on other queues as well
49 +* This would mean that the external system can only push data to eMagiz (so no polling of data)
50 +* This would mean that the external system can directly place data on a queue
51 +* This would create a tightly coupled dependency between the external system and eMagiz
52 52  
53 -=== 3.2 Asynchronous vs Synchronous ===
53 +The above arguments concluded that the connectivity between eMagiz and the external system and the internal queue mechanism of eMagiz should be considered two separate things. This conclusion did raise a question on how eMagiz can guarantee message delivery. The messaging engine uses queues to ensure message delivery. But what if the first queue (the onramp queue) cannot be reached? What happens then.
54 54  
55 -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"]].
55 +The H2 database is introduced to safeguard against any problems within the entry. This component is generated in every entry in eMagiz. This H2 database will temporarily store data and act as a bridge between the entry and the onramp queue. This way, eMagiz can guarantee message delivery. If you want to learn more about the function of the H2 database, please check out this [microlearning](intermediate-solution-architecture-function-of-h2-database.md).
56 56  
57 +To summarize:
58 +
59 +* Entry is the starting point of the integration process in messaging
60 +* Queues are an internal resource of eMagiz
61 +* Outside parties are not allowed to write on eMagiz queues directly
62 +* eMagiz facilitates various connectivity methods (i.e., REST, SOAP, Database, File)
63 +
64 +===== Practice =====
65 +
57 57  == 4. Assignment ==
58 58  
59 -Analyze a synchronous messaging flow from entry to exit and learn what happens within this process.
60 -This assignment can be completed with the help of your (Academy) project you have created/used in the previous assignment.
68 +No assignment accompanies this microlearning.
61 61  
62 62  == 5. Key takeaways ==
63 63  
64 -* Synchronous messaging is the less used, the less advised option when implementing a messaging integration via eMagiz
65 -* Key characteristics of synchronous messaging are:
66 - ** Blocking. The sender initiates the process and waits for a response before continuing with the following message
67 - ** Systems depend on the responses of other systems for their function
68 - ** Messages have a time limit. The response needs to be back within 25 seconds (eMagiz default)
69 - ** Uses a request-response structure that talks to one system at a time
70 -* Using the API Gateway pattern can be a valid alternative when dealing with a synchronous integration demand.
72 +* The key aspects are:
73 + * Entry is the starting point of the integration process in messaging
74 + * Queues are an internal resource of eMagiz
75 + * Outside parties are not allowed to write on eMagiz queues directly
76 + * eMagiz facilitates various connectivity methods (i.e., REST, SOAP, Database, File)
71 71  
78 +
79 +
72 72  == 6. Suggested Additional Readings ==
73 73  
74 -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:
82 +If you are interested in this topic, please boost your knowledge with the help of the internet.
75 75  
76 -* [[Crash Course (Menu)>>doc:Main.eMagiz Academy.Microlearnings.Crash Course.WebHome||target="blank"]]
77 -** [[Crash Course Messaging (Navigation)>>doc:Main.eMagiz Academy.Microlearnings.Crash Course.Crash Course Messaging.WebHome||target="blank"]]
78 -*** [[Messaging Asynchronous (Explanation)>>doc:Main.eMagiz Academy.Microlearnings.Crash Course.Crash Course Messaging.crashcourse-messaging-messaging-asynchronous||target="blank"]]
79 -* [[Intermediate Level (Menu)>>doc:Main.eMagiz Academy.Microlearnings.Intermediate Level.WebHome||target="blank"]]
80 -** [[Understanding Error Handling (Navigation)>>doc:Main.eMagiz Academy.Microlearnings.Intermediate Level.Understanding Error Handling.WebHome||target="blank"]]
81 -*** [[Error Handling in Messaging Synchronous>>doc:Main.eMagiz Academy.Microlearnings.Intermediate Level.Understanding Error Handling.intermediate-understanding-error-handling-in-emagiz-messaging-synchronous||target="blank"]]
82 -* [[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"]]
83 -)))
84 +== 7. Silent demonstration video ==
84 84  
85 -((({{toc/}}))){{/container}}
86 -{{/container}}
86 +As this is a more theoretical microlearning, we have no video for this.
87 +
88 +</div>
89 +
90 +</div>
91 +</div>
92 +
93 +{{/html}}