My. Batis 3 Java APIThe primary Java interface for working with My. Batis is the Sql. Session. Through this interface you can execute commands, get mappers and manage transactions. Well talk more about Sql. Session itself shortly, but first we have to learn how to acquire an instance of Sql. Session. Sql. Sessions are created by a Sql. New Executor Framework Example In Java 2017 - Full Version' title='New Executor Framework Example In Java 2017 - Full Version' />Session. Factory instance. The Sql. Session. Factory contains methods for creating instances of Sql. Sessions all different ways. The Sql. Session. Factory itself is created by the Sql. Troubleshooting Guide for EndUser Experience Monitoring in SAP Solution Manager 7. Content. Hadoop framework is written in Java klaptop cd Update the source list klaptop sudo aptget update The OpenJDK project is the default version of Java. Introducing WebDriver The primary new feature in Selenium 2. WebDriver API. WebDriver is designed to provide a simpler, more concise. Session. Factory. Builder that can create the Sql. Sesson. Factory from XML, Annotations or hand coded Java configuration. KwK5mTW8Ys/Vv6y6l5lGqI/AAAAAAAAAy0/h_a0zDROd7E7VTBoltdXBm3FfNWmWIZOA/s640/CreateCustomer.png' alt='New Executor Framework Example In Java 2017 - Full Version' title='New Executor Framework Example In Java 2017 - Full Version' />NOTE When using My. Batis with a dependency injection framework like Spring or Guice, Sql. Sessions are created and injected by the DI framework so you dont need to use the Sql. Session. Factory. Builder or Sql. Session. Factory and can go directly to the Sql. The JUnit Platform serves as a foundation for launching testing frameworks on the JVM. It also defines the TestEngine API for developing a testing framework that runs. The NASDAQ 100 Pre Market Indicator is up 28 76 to 6 366 63 The total Pre Market volume Read Full Story. This guide is for developers who are past the basics of building an app, and now want to know the best practices and recommended architecture for building robust. Kilauea Mount Etna Mount Yasur Mount Nyiragongo and Nyamuragira Piton de la Fournaise Erta Ale. Session section. Please refer to the My. Batis Spring or My. Batis Guice manuals for further info. Sql. Session. Factory. Builder. The Sql. Session. Factory. Builder has five build methods, each which allows you to build a Sql. New Executor Framework Example In Java 2017 - Full Version' title='New Executor Framework Example In Java 2017 - Full Version' />Session from a different source. Sql. Session. Factory buildInput. Stream input. Stream. Sql. Session. Factory buildInput. Stream input. Stream, String environment. Sql. Session. Factory buildInput. Stream input. Stream, Properties properties. Sql. Session. Factory buildInput. Stream input. Stream, String env, Properties props. Sql. Session. Factory buildConfiguration configThe first four methods are the most common, as they take an Input. Stream instance that refers to an XML document, or more specifically, the mybatis config. The optional parameters are environment and properties. Environment determines which environment to load, including the datasource and transaction manager. For example lt environments defaultdevelopment. Manager typeJDBC. Source typePOOLED. Manager typeMANAGED. Source typeJNDI. If you call a build method that takes the environment parameter, then My. Batis will use the configuration for that environment. Of course, if you specify an invalid environment, you will receive an error. If you call one of the build methods that does not take the environment parameter, then the default environment is uses which is specified as defaultdevelopment in the example above. If you call a method that takes a properties instance, then My. Batis will load those properties and make them available to your configuration. Those properties can be used in place of most values in the configuration using the syntax prop. NameRecall that properties can also be referenced from the mybatis config. Therefore its important to understand the priority. We mentioned it earlier in this document, but here it is again for easy reference If a property exists in more than one of these places, My. Batis loads them in the following order. Properties specified in the body of the properties element are read first,Properties loaded from the classpath resource or url attributes of the properties element are read second, and override any duplicate properties already specified,Properties passed as a method parameter are read last, and override any duplicate properties that may have been loaded from the properties body and the resourceurl attributes. Thus, the highest priority properties are those passed in as a method parameter, followed by resourceurl attributes and finally the properties specified in the body of the properties element. So to summarize, the first four methods are largely the same, but with overrides to allow you to optionally specify the environment andor properties. Here is an example of building a Sql. Session. Factory from an mybatis config. String resource orgmybatisbuildermybatis config. Input. Stream input. Stream Resources. Resource. As. Streamresource. Sql. Session. Factory. Builder builder new Sql. Session. Factory. Builder. Sql. Session. Factory factory builder. Stream Notice that were making use of the Resources utility class, which lives in the org. The Resources class, as its name implies, helps you load resources from the classpath, filesystem or even a web URL. A quick look at the class source code or inspection through your IDE will reveal its fairly obvious set of useful methods. Heres a quick list URL get. Resource. URLString resource. URL get. Resource. URLClass. Loader loader, String resource. Input. Stream get. Resource. As. StreamString resource. Input. Stream get. Resource. As. StreamClass. Loader loader, String resource. Properties get. Resource. As. PropertiesString resource. Properties get. Resource. As. PropertiesClass. Loader loader, String resource. Reader get. Resource. As. ReaderString resource. Reader get. Resource. As. ReaderClass. Loader loader, String resource. File get. Resource. As. FileString resource. File get. Resource. As. FileClass. Loader loader, String resource. Input. Stream get. Url. As. StreamString url. String. Reader get. Url. As. ReaderString url. String. Properties get. Url. As. PropertiesString url. String. Class class. For. NameString class. NameThe final build method takes an instance of Configuration. The Configuration class contains everything you could possibly need to know about a Sql. Session. Factory instance. The Configuration class is useful for introspecting on the configuration, including finding and manipulating SQL maps not recommended once the application is accepting requests. The configuration class has every configuration switch that youve learned about already, only exposed as a Java API. Heres a simple example of how to manually a Configuration instance and pass it to the build method to create a Sql. Session. Factory. Data. Source data. Source Base. Data. Test. create. Blog. Data. Source. Transaction. Factory transaction. Factory new Jdbc. Transaction. Factory. Environment environment new Environmentdevelopment, transaction. Factory, data. Source. Configuration configuration new Configurationenvironment. Lazy. Loading. Enabledtrue. Enhancement. Enabledtrue. Type. Alias. Registry. AliasBlog. class. Type. Alias. Registry. AliasPost. class. Type. Alias. Registry. AliasAuthor. class. MapperBound. Blog. Mapper. class. configuration. MapperBound. Author. Mapper. class. Sql. Session. Factory. Builder builder new Sql. Session. Factory. Builder. Sql. Session. Factory factory builder. Now you have a Sql. Session. Factory that can be used to create Sql. Session instances. Sql. Session. Factory. Sql. Session. Factory has six methods that are used to create Sql. Session instances. In general, the decisions youll be making when selecting one of these methods are Transaction Do you want to use a transaction scope for the session, or use auto commit usually means no transaction with most databases andor JDBC drivers Connection Do you want My. Batis to acquire a Connection from the configured Data. Source for you, or do you want to provide your ownExecution Do you want My. Batis to reuse Prepared. Statements andor batch updates including inserts and deletes The set of overloaded open. Session method signatures allow you to choose any combination of these options that makes sense. Sql. Session open. How To Start A Program As An Emcee. Session. Sql. Session open. Sessionboolean auto. Commit. Sql. Session open. SessionConnection connection. Sql. Session open. SessionTransaction. Isolation. Level level. Sql. Session open. SessionExecutor. Type exec. Type,Transaction. Isolation. Level level. Concurrency Java Futures and Kotlin Coroutines. A long time ago, one had to manually start new threads when wanting to run code concurrently in Java. Not only was this hard to write, it was easy to introduce bugs that were hard to find. Testing, reading and maintaining such code was no walk in the park either. Since that time, and with a little incentive coming from multi core machines, the Java API has evolved to make developing concurrent code easier. Meanwhile, alternative JMV languages also have their opinion about helping developers write such code. In this post, Ill compare how its implemented in Java and Kotlin. To keep the post focused, I deliberately left out performance to write about code readability. About the Use Case. The use case is not very original. We need to call different web services. The naive solution would be to call them sequentially, one after the other, and collect the result of each of them. In that case, the overall call time would be the sum of the call time of each service. An easy improvement is to call them in parallel, and wait for the last one to finish. Thus, performance improves from linear to constant or for the more mathematically inclined, from on to o1. To simulate calling a web service with a delay, lets use the following code in Kotlin because this is so much less verbose class Dummy. Serviceprivate val name String. Secure. Random. Content. Duration. Int5. 00. Thread. Long. return Content. Durationname, duration. Content. Durationval content String, val duration IntThe Java Future APIJava offers a whole class hierarchy to handle concurrent calls. Its based on the following classes Callable A Callable is a task that returns a result. From another view point, its similar to a function that takes no parameter and returns this result. Future A Future is the result of an asynchronous computation. Also, The result can only be retrieved using method get when the computation has completed, blocking if necessary until it is ready. In other words, it represents a wrapper around a value, where this value is the outcome of a calculation. Executor Service An Executor. Service provides methods to manage termination and methods that can produce a Future for tracking progress of one or more asynchronous tasks. It is the entry point into concurrent handling code in Java. Implementations of this interface as well are more specialized ones, can be obtained through static methods in the Executors class. This is summarized in the following class diagram Calling our services using the concurrent package is a 2 steps process. Creating a Collection of Callables. First, there needs to be a collection of Callable to pass to the executor service. This is how it might go From a stream of service names. For each service name, create a new dummy service initialized with the string. For every service, return the services get. Contentmethod reference as a Callable. This works because the method signature, matches Callable. Callable is a functional interface. This is the preparation phase. It translates into the following code Listlt Callablelt Content. Duration callables Stream. Service A, Service B, Service C. Dummy. Service new. Callablelt Content. Duration service get. Content. collectCollectors. List Processing the Callables. Once the list has been prepared, its time for the Executor. Service to process it aka the real work. Create a new executor service any will do. Pass the list of Callable to the executor service, and stream the resulting list of Future. For every future,Either return the result. Or handle the exception. The following snippet is a possible implementation Executor. Service executor Executors. Work. Stealing. Pool. Listlt Content. Duration results executor. Allcallables. stream. Interrupted. Exception Execution. Exception e throw new Runtime. Exceptione. Collectors. List The Future API, but in Kotlin. Lets face it, while Java makes it possible to write concurrent code, reading and maintaining it is not that easy, mainly due to Going back and forth between collections and streams. Handling checked exception in lambdas. Casting explicitly. Just porting the above code to Kotlin removes those limitations and makes it more straightforward var callables Listlt Callablelt Content. Duration array. OfService A, Service B, Service C. Dummy. Serviceit. Callablelt Content. Duration it. Executors. Work. Stealing. Pool. Allcallables. map it. Kotlin Coroutines. With version 1. 1 of Kotlin comes a new experimental feature called coroutines. Basically, coroutines are computations that can be suspended without blocking a thread. Blocking threads is often expensive, especially under high load. Coroutine suspension is almost free, on the other hand. No context switch or any other involvement of the OS is required. The leading design principle behind coroutines is that they must feel like sequential code but run like concurrent code. The are based on the following class diagram Nothing beats the code itself though. Lets implement the same as above, but with coroutines in Kotlin instead of Java futures. As a pre step, lets just extend the service to ease further processing by adding a new computed property wrapped around content, of type Deferred val Dummy. Service. async. Content Deferredlt Content. Duration. get asyncCommon. Pool content This is standard Kotlin extension property code, but notice the Common. Pool parameter. This is the magic that makes the code run concurrent. Its a companion object i. Executor. Service instance. Now, onto the code flow proper Coroutines are handled inside a block. Declare a variable list outside the block to be assigned inside it. Open the synchronization block. Create the array of service names. For each name, create a service and return it. For each service, get its async content declared above and return it. For each deferred, get the result and return it. Variable must be initialized or the compiler complains. And the variable cannot be used afterwards. Listlt Content. Duration null. OfService A, Service B, Service C. Dummy. Serviceit. Content. map it. Takeaways. The Future API is not so much a problem than the Java language itself is. As soon as the code is translated into Kotlin, readability improves a lot. Bluetooth Software For Hp Laptop. Yet, having to create a collection to pass to the executor service breaks the nice functional pipeline. For coroutines, the only compromise is to move from a var to a val to get the final results or to add the results to a mutable list. Also, remember that coroutines are still experimental. Despite all of that, code does look sequential and is thus more readable, and behaves parallel. The complete source code for this post can be found on. Git. Hub in Maven format.