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1		-Command Queue
	1	+expert-create-your-transformations-xpath-expert

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1	1	{{container}}{{container layoutStyle="columns"}}(((
2		-Within the platform of eMagiz, sometimes you need to send a particular command from the eMagiz portal to retrieve information or execute a specific action. These commands can happen from the Deploy and the Manage phase. The two most noteworthy examples of the triggered command queue are the runtime dashboard functionalities and the message redelivery actions.
	2	+Within the crash course, we already explained XPath conceptually. In that same microlearning, we looked at some more uncomplicated cases of using XPath within your transformation. If you need to brush up on that knowledge, please check out this [[microlearning>>doc:Main.eMagiz Academy.Microlearnings.Crash Course.Crash Course Platform.crashcourse-platform-create-transformation-xpath-basic.WebHome||target="blank"]]. In the intermediate microlearning on this subject, we built upon that knowledge. Please check out this [[microlearning>>doc:Main.eMagiz Academy.Microlearnings.Intermediate Level.Create your transformations.intermediate-create-your-transformations-xpath-intermediate.WebHome||target="blank"]] if you need a refresher on that. In the [[microlearning>>doc:Main.eMagiz Academy.Microlearnings.Advanced Level.Create your transformations.advanced-create-your-transformations-xpath-advanced.WebHome||target="blank"]] that followed, we built upon that knowledge and looked at some concrete, practical examples that could be useful in your project. In this microlearning, we will wrap the concept of XPath by looking at three complex XPath alternatives that are sometimes needed when dealing with messages in eMagiz.
3	3
4	4	Should you have any questions, please get in touch with [[academy@emagiz.com>>mailto:academy@emagiz.com]].
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6	6	== 1. Prerequisites ==
7	7
8	8	* Expert knowledge of the eMagiz platform
	9	+* [[XPath Basic>>doc:Main.eMagiz Academy.Microlearnings.Crash Course.Crash Course Platform.crashcourse-platform-create-transformation-xpath-basic.WebHome||target="blank"]]
	10	+* [[XPath Intermediate>>doc:Main.eMagiz Academy.Microlearnings.Intermediate Level.Create your transformations.intermediate-create-your-transformations-xpath-intermediate.WebHome||target="blank"]]
	11	+* [[XPath Advanced>>doc:Main.eMagiz Academy.Microlearnings.Advanced Level.Create your transformations.advanced-create-your-transformations-xpath-advanced.WebHome||target="blank"]]
9	9
	13	+
10	10	== 2. Key concepts ==
11	11
12		-This microlearning focuses on the command queue. The command queue communicates between the eMagiz portal and an eMagiz runtime.
	16	+This microlearning focuses on very complex XPath operations.
13	13
14		-* Commands towards a runtime, for example, to retrieve runtime information in the runtime dashboard, are sent via the command queue
15		-* You can monitor the command queue the same way as any other queue within your model
16		-* The command queue is prominently used when accessing the [[Runtime Dashboard>>doc:Main.eMagiz Academy.Microlearnings.Crash Course.Crash Course Platform.crashcourse-platform-deploy-runtime-dashboard||target="blank"]] and when using [[Message Redelivery>>doc:Main.eMagiz Academy.Microlearnings.Intermediate Level.Message Redelivery.WebHome||target="blank"]]
	18	+With XPath Expert, we mean learning that XPath options are sometimes very complex but could benefit you in specific cases in your daily work.
17	17
18		-== 3. Command queue ==
	20	+Some of the very complex XPath options are:
19	19
20		-Within the platform of eMagiz, sometimes you need to send a particular command from the eMagiz portal to retrieve information or execute a specific action. These commands can happen from the Deploy and the Manage phase. The two most noteworthy examples of the triggered command queue are the runtime dashboard functionalities and the message redelivery actions.
	22	+* matches
	23	+* replace
	24	+* tokenize
21	21
22		-For example, when you navigate the Runtime Dashboard and click on a runtime, the eMagiz portal will send a command to the runtime via the command queue to retrieve the runtime state. So, for example, the same logic applies when you select a flow and stop it.
	26	+== 3. XPath Expert ==
23	23
24		-For Message redelivery, the command queue retrieves all messages in the dead letter queue and resends messages via the command queue.
	28	+Within the crash course, we already explained XPath conceptually. In that same microlearning, we looked at some more uncomplicated cases of using XPath within your transformation. If you need to brush up on that knowledge, please check out this [[microlearning>>doc:Main.eMagiz Academy.Microlearnings.Crash Course.Crash Course Platform.crashcourse-platform-create-transformation-xpath-basic.WebHome||target="blank"]]. In the intermediate microlearning on this subject, we built upon that knowledge. Please check out this [[microlearning>>doc:Main.eMagiz Academy.Microlearnings.Intermediate Level.Create your transformations.intermediate-create-your-transformations-xpath-intermediate.WebHome||target="blank"]] if you need a refresher on that. In the [[microlearning>>doc:Main.eMagiz Academy.Microlearnings.Advanced Level.Create your transformations.advanced-create-your-transformations-xpath-advanced.WebHome||target="blank"]] that followed, we built upon that knowledge and looked at some concrete, practical examples that could be useful in your project. In this microlearning, we will wrap the concept of XPath by looking at three complex XPath alternatives that are sometimes needed when dealing with messages in eMagiz.
25	25
26		-{{info}}When all commands sent from the eMagiz portal are not working across models, something is probably broken in the backend of the eMagiz platform. In these cases, please contact us at [[support@emagiz.com>>mailto:support@emagiz.com]]{{/info}}
	30	+Some of the very complex XPath options are:
27	27
	32	+* matches
	33	+* replace
	34	+* tokenize
	35	+
	36	+=== 3.1 matches ===
	37	+
	38	+Sometimes, you want to determine whether a specific value within your payload matches a pattern. In those cases, you can use the XPath function called matches. The function will return true if the supplied string matches a given regular expression. So, for example, if you want to check whether your OrderID contains exactly seven digits and nothing else, the following XPath expression will work for your use case.
	39	+
	40	+matches(OrderID,'^\d{7}$')
	41	+
	42	+As a result, you will get a true or false back which you can then use as a filter or within an if-then-else construction.
	43	+
	44	+=== 3.2 replace ===
	45	+
	46	+The replace function has many similarities with the matches function. It builds on the premise of the matches function, but instead of returning a true or false, you can state with what you want to replace the matched string. In other words, this function returns a string produced from the input string by replacing any substrings that match a given regular expression with a supplied replacement string.
	47	+
	48	+When we apply this to our earlier example, we can state that when the OrderID contains any non-digit, we will replace this value with nothing. This will lead to the following XPath expression.
	49	+
	50	+replace(OrderID,'\D','')
	51	+
	52	+With a given input string of 12C34A567, the returned result will be 1234567.
	53	+
	54	+=== 3.3 tokenize ===
	55	+
	56	+The tokenize function can split a string into multiple entries for you. This is particularly useful when you want to match an input string to a list of possible values that are valid for that string. For example, the function returns a sequence of strings constructed by splitting the input wherever a separator is found; the separator is any substring that matches a given regular expression.
	57	+
	58	+So, for example, when the input string for AddressID is "street,housenumber,housenumberaddition" and you want to tokenize this with the help of the separator, you could use, in this example, the comma between the values as the separator. This will lead to the following XPath expression.
	59	+
	60	+tokenize(AddressID,',')
	61	+
	62	+The given input detailed above will result in the following output: street housenumber housenumberaddition.
	63	+
28	28	== 4. Assignment ==
29	29
30		-There is no assignment for this microlearning.
	66	+Check out which of the XPaths we have discussed today can be found within your project.
	67	+This assignment can be completed within the (Academy) project you created/used in the previous assignment.
31	31
32	32	== 5. Key takeaways ==
33	33
34		-* Commands towards a runtime, for example, to retrieve runtime information in the runtime dashboard, are sent via the command queue
35		-* You can monitor the command queue the same way as any other queue within your model
36		-* The command queue is prominently used when accessing the [[Runtime Dashboard>>doc:Main.eMagiz Academy.Microlearnings.Crash Course.Crash Course Platform.crashcourse-platform-deploy-runtime-dashboard.WebHome||target="blank"]] and when using [[Message Redelivery>>doc:Main.eMagiz Academy.Microlearnings.Intermediate Level.Message Redelivery.WebHome||target="blank"]]
	71	+Some of the very complex XPath options are:
37	37
	73	+* matches
	74	+* replace
	75	+* tokenize
	76	+
38	38	== 6. Suggested Additional Readings ==
39	39
40		-There are no suggested additional readings.
	79	+If you are interested in this topic and want more information on it, please read the help text provided by eMagiz and read more information on the following links:
41	41
	81	+* http://www.xsltfunctions.com/xsl/fn_matches.html
	82	+* http://www.xsltfunctions.com/xsl/fn_replace.html
	83	+* http://www.xsltfunctions.com/xsl/fn_tokenize.html
	84	+
42	42	== 7. Silent demonstration video ==
43	43
44	44	As this is more of theoretical microlearning, there is no video accompanying the microlearning.)))((({{toc/}}))){{/container}}{{/container}}