Jakarta EE JakartaOne Livestream Japanese 2022, 27 Sep 2022

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From YouTube: CN4J STUDIO - JAKARTA CONCURRENCY, NOW AND FUTURE

Description

Jakarta Concurrency provides specifications for using concurrency from application components without compromising container integrity while preserving the fundamental benefits of the Jakarta EE platform. In this session, you can hear the outline of the Concurrency 2.0 specification in Jakarta EE 9 and the Concurrency 3.0 specification scheduled to be implemented in Jakarta EE 10.

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Yes, I would like to continue with Mr. Ito from Oracle's session on the present and future of the Jakarta Concurrency. Thank. You very much.

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Jakarta Concurrency 3.0 I.

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Would like to talk mainly about Jakarta 3.0,, which has undergone a major version: upgrade. This, time, I.

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Myself have been.

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Implemented since the time of javae 7 and have reached the present,, but this time the specification is C2.0 as the latest version. I.

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Think it's a specification implemented in the Jakarta Conference itself,, but basically.

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It's a function that realizes asynchronous execution of Jakarta applications, and it.

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's, a servlet and jebJava Enterprise bean. It is.

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Designed to run applications as tasks from servlets and jeb., Parallel, processing and asynchronous processing are possible.

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So, for those who can use this utility, this jackal and this practice utility can be easily understood and used.

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As a means of asynchronous execution that can be used as a means of executing applications,, so-called messaging processing-based process creation using JMS or mdb. Message-Driven dean has a history of not recommending anything. In. The.

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Form of execution,, it's pretty recent,.

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Around Servlet 3.0 ejb 3.1 after Jagai 6 It.

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Became possible to run applications a little asynchronously,, but it was limited to each index. The.

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System of utility was introduced,, and this progressed to 9 points in Jakarta, and the positive points of this time led to a major version upgrade to practice. Utility 3.0.

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However, as I just mentioned,,.

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Thread generation from web servlets and jeb and parallel processing itself are executed in the form of tasks, and the context of Jakarta. E also needs to transmit radio waves,, and it is also necessary to manage the thread. Pool. This is what I'm practicing this time to make. It run stably when the whole is put together in the form of life cycle, management,.

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But these themselves are.

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Executed by modules composed of four components. It's, a money-managed executor service, battle. This is a.

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Component that controls thread generation and asynchronous task execution in a basic container. It.

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Includes elements like timers.

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Components are.

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Managed schedules and executor services, and they have functions such as execution at a certain point in time or cyclic, execution.

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This context service manages the radio wave management of context, information, thread, management, thread, pool management, generation, and.

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Reuse,, this managed straight factory is in charge.

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Looking at the overall diagram,, the implementation of the application server.

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Contains the four components that I just mentioned, the components of the conference, and the application itself is a component of the servlet and the jeb.

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Application is executed in each container and.

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Calls this application.

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By implementing one of these interfaces,, it can be called from the application in this container.

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Now,, let's talk about practice: utility 3.0., There.

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Are 5 major additions listed here.

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This is the first time that we can use the CDI bin for asynchronous execution. And. The second is schedule execution of tasks. This is the schedule and executor.

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Service. Although, it is a functional extension in ,. There.

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Are functional extensions such as time zone, support and hypothetical support. The.

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Fourth and fifth function is the function of context propagation,, which is the context radio.

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Wave for parallel stream operation, and the micro- profile. It will be these functions of porting the use of context, radio waves,. So today, I would like to briefly introduce the three above these three.

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I would like to mention that the.

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Station called Ei-Synchronous Notation was newly added to the practice in Jakarta. This time.

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In the class called Recommendations, on the second line,, the @A.

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Synchronous annotation is defined, and the.

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Jndi name and the executor are written in parentheses. This is the F queuer. The resource of the service.

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Is assigned here.

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Under, this @ synchronous method,, this asynchronous method called Find Seminar.

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Is described, This can be used as a CDIbean Asynchronous It's going to be a method, but well,. This is how this method is called,. So.

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This process itself is easy to explain. What's going on, internally. If.

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There is a list of products and the user clicks on the list of products and.

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Looks at it over and over again, in the recommendation section on the side of the page,. There is something like this as a recommended: product.

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It's, a process that automatically outputs something like that, and the.

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Process that the customer is watching over and over again is being done internally asynchronously in this.

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So, I would like to say that when a certain user looks at a product page and clicks on the product on that page,, we compare the number of times the product itself has been viewed up to now.

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Three times through the history of the database. If. You look at the above,.

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It feels like the internal processing that you put out in the comments is written. Here., The, internal processing, part and the generation of the database connection are.

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In this method, called Find Seminar. This.

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Is the surflet on the calling side. This is the checkout servet, and its contents are described.

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This resource is injected into the database's data connection itself,.

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When a get method request comes in. When, this Find Seminar method is.

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Called, and when the All Accept method is called,, it will be possible to.

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Compare with the process of what kind of item the user is looking at and how many times it is looking at the product. I.

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Hope you have understood a little bit from this example that a good combination with asynchronous processing is implemented in this servlet. This terrible method has two limitations.: One is cdib,, but it cannot be used with JB. Also, micro-profile.

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Cannot coexist with rotation,, so please be careful about this part.

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And about the transaction attributes that can be used with this asynchronous method, I.

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'll just touch on this transaction attribute a little bit,, but when the method is executed in a new transaction,, the transaction attribute will be requested and will not be supported. In. This case,. It means that the method is executed without a transaction,. So please keep in mind only this part of the transaction attribute.

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Schedule executor service, Managed, executor, service, In, this, time zone, support and hypothetical support are included.. These are the.

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Interface called zone trigger and the class called cron trigger, respectively.

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Each of these can now be realized.. There is a ghost here. In the method called Coulomb Trigger,. There is a theoretical.

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There is a time zone, New York,, so it's Eastern time,, so it's Eastern, time, Monday through Friday, and from.

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September to May of the following year.

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Passed to In the same way,, this can be described in full circles and patterns in the same way.By. Passing this trigger.

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To the schedule, method of the managed schedule and executor service,, the task will be executed. So,. The third is the resource definition by.

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That statement.

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In the code,. It is now possible to describe the rotation of resources related to this time.

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Each of the four components and.

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Services such as managed services and schedules that I mentioned,.

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Etc., can be described by defining resource definitions for them.. You can do this as an example of using it,. Here is the servlet,.

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Resource injection is done in the servlet,, but in the previous part above this,, the.

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Resource definition of the managed executor service can be found here, On the other hand,.

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Jndia of jndi hangs the task with this name. The.

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Number of seconds the task- hangs. The number of.

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Seconds until the task hangs. It is.

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Written here that the propagation of content, security and prop phenomena related to applications will be performed.

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Yes,, it's been a while,, but that's.

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All for the story of the Jakarta Conference, so far. Thank you for.

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Watching so far Thank you for your continued.

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