Jakarta EE JakartaOne Livestream Japanese 2022, 27 Sep 2022

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From YouTube: CN4J STUDIO - MICROPROFILE CONFIG

Description

MicroProfile Config specification allows a common procedure to provide configuration information to applications from various sources. It is a convenient and useful API for not only microservices but also traditional Java EE applications. With Open Liberty runtime, you can use it with existing Java EE applications.

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I would like to ask many of you to.

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Continue to explain the.

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Micro- profile configuration API. Thank, you very much., What kind of functions. Does this config API provide? In a nutshell,? It.

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Is an API for externally acquiring the configuration information used by the application. When trying to get information, for example,? You can write it in a property, file, load it, and get it with an etet property, or you can set it as a system property and get it with a property, or you can get it by accepting an environment, variable. In. This way,.

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Different information actions were written for each source from which the configuration was acquired,, but this is an example where it is possible to write this in a unified manner.

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For example,, if this is a config API,, you can assign a value to a variable with an annotation such as @inject@confic property written here.

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Using the config API function. Depending on the environment,, there are.

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Cases where you want to give information in system properties, or in another environment, you want to give information in environment, variables., The.

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Advantage of this computer is that it can be obtained from various places, using only one method without rewriting the JAV code. There are.

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Two ways to obtain values: using this configuration API. There is,, but the first.

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Method is to use the CDI function to inject by injection defense injection.

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In, the variable, it is described as @inject, and in addition, it is.

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Attached to the config in the form of @property. By, adding it,, it looks for a value named "message" from various configuration software and.

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Assigns the found value to this string.In addition,, even in an environment where CDI cannot be used., As a method that can be used, a class called config provider is provided. By executing this static method, Get config,! You can obtain an instance of the config. If. You.

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Do that, you will be able to search for that name, acquire the value, and handle it from the application.

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There's, something called a configuration source, and it's designed to fetch values from here.

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These are system properties,, environment, variables, and file economies called micro-profile, compute properties.

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There are config sources that are provided independently by the runtime. Then, in the application,. You can also create and use your own custom config sources.In. This case, implement the config source, interface. If. You prepare this class and describe it in the welfare file,. You can use it from your application.

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First of all,.

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These three configuration sources must be prepared for use.

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In, the configuration source, each priority is set as a value, and the search is performed in order from the highest postal order.In, the configuration source,, the system property is 400,, the environment variable is 300, and the micro profile configuration. is a priority of 100 Note.

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In addition to this, I would like to introduce some of the configuration sources that can be used in each runtime,, but first from IBM Provided web carrier Liberty,, which is an open source version of Open Liberty,, is a configuration device that can be used. It.

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Can be used at rank 600. Also, in Liberty, Open Liberty,. You.

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Can set a variable called variable in the server xml of the configuration file and refer to it in various places. The set value can be obtained with a priority of 500. Also, in this variable,. You.

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Can set a default value that will be used as the default value when it is not set anywhere else. However,. This can be obtained with priority 1.

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Continuing on,. There.

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Is a configuration source that can be.

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Used by Focus from Red Hat.

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Confi AP is also used in the composition of the scene to be played, and in fact,. Various focus settings can also be acquired using this computer. The.

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Value set inside can be obtained with various priorities.

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In, the form of MaxValu, it can be obtained with the highest priority.. It is not possible to overwrite this, but other than that, for things that can be changed at runtime,.

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Only the application on the classpath Or, the concept- is Application of the Week And. The property values obtained from here.

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Can be obtained with a priority such as 25260. It.

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Is in a form that can be referenced by a value such as 295,, which is a high value of 295. It, is.

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Also released by Red Hat, and javau's application, server, jbos and its open source version, Wildfly, are currently in the form of technical previews.. Configuration API can now be used. On. This side, configuration information is not written at all, and basically only the information used by the application is stored.

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In addition to the three directional sources that have been prepared,, servlet, configs,, filter, computers,, tablet context, attributes,, etc.

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can be obtained with a priority order of 45160. On. The other hand, powder is also available. In fact,. The configuration information is stored in this day.

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Of, the welfare information,, those that cannot be changed at runtime, are stored in the form of a priority of 1000 and various values. Also, in the manual,. There are other information,, such as directory passwords, domain hndi, etc., from individual legal operations., It's.

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Written, but when I tried it at hand,, the value was empty,, so it's a little unclear how this is used.

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This one too, that config function is.

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Also used to set the configuration of the application server, runtime. It's.

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Just that,, but for some reason the priority is all set to 100,, so you can set it in one place and flirt with it in another, setting. It's a little unclear whether or not in this way,. The configuration API is.

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Used not only to store the configuration of the user application,, but also to store the configuration of the runtime itself, depending on the randomness. For. That reason,. If you use a very simple name or something like the package name of the class, because of the direction of the runtime and the danger of using it,.

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When using this AI in a user, application. It is.

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Recommended to use names separated by periods with namespaces. In. This document,, due to space constraints, I, ended up using a name like message,, but that's not a good idea. Instead,. When you actually use it,. It.

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Is recommended that you get to know long names such as jp,, which was a large hospital that was a com, and confect and message. Due to time constraints, I can't introduce it,, but it's used in a mechanism called config profile,, so it ca n't be used as a normal name. It will.

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Only be a string, For example,, the values that can be obtained from environment variables or system properties are basically just strings,, but this is the value using the configuration API When you inject into or get a value,. You.

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Can apply it to.

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Things other than strings. If. You try to use the value in a form other than a string in something other than a stream,. The converter is used by default. A.

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Long optional, double, and then, as a classmate jav It, is now possible to use a converter that converts to the aland class.In addition,. It is also possible to obtain it as an array.You can also implement and configure your own application. Converter. There are.

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Some things that need to be taken into consideration when using this built-in converter. When it.

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Comes to the value of Java Rank field,, it becomes TRUE only when the character string, "TRUE" is received,, but in convenience store APIs,.

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Values can also be obtained when models such as "yes yon" are changed.

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Or,, when you try to get a value in an array,, the values separated by commas are treated as individual values. and stored in order. You can get it in the form of an array.

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If you want to use this comma as a value instead of a delimiter, use, a backslash or backslash to escape it. Also get the value from the environment. Variable. In this case, special conversion rules are defined for names.. This is because there are cases where periods cannot be used in environment variables depending on the environment,. So names are converted, according to certain rules, to search for values., For example,.

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When trying to obtain a name such as JP, Dot Test and this Philval,, the value is first searched from the environment variable with the name itself as it is,. But if this is not found, Alphanumeric In addition,, the period is converted to underscores, and the value is still searched.

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It is also possible to use expressions.

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Will be a function in which the acquisition is performed again with the configuration API and the result is substituted here. For example,, when writing the mackerel. Url = http corona draw mark secured server, dot cost When, you get a URL called this server and the server dot cost between this dollar mark is.

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Searched again in this figure and resolved to below, and it is substituted here, As a result it contains. This This is how the config API provides a number of very useful functions when retrieving configuration, information from an application. It's, an API,, and this configapi is.

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Under consideration for inclusion in future versions of Jakarta E,, but even now, it's not just the micro-profile implementation,, but also the James I introduced, today, or Open Liberty. Like,. A lot of JAV and Jaccal can be used on application servers,, especially if it's Websteer Liberty.

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You can get the config API. Probably when Jakarta Inn is introduced,. That package.

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May be converted or changed from the current old series to Jakarta,, but even in such a case. Well,, if you're Liberty, you'll be able to use it in the future as it is today. That.

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Was the commentary Micro Profile Config can only be used with Micro Profile at the moment,, but there are.

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Plans to be able to use Jakata, Iden,, so I hope it will be useful to everyone.. I would like to.