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The scheduleAtFixedRate() method creates a new task and submits it to the executor every period, regardless of whether or not the previous task finished. On the other hand, the scheduleWithFixedDelay() method creates a new task after the previous task has finished. edited Apr 15, 2020 at 17:52. eduhoribe. 3 2.
scheduleAtFixedRate: In fixed-rate execution, each execution is scheduled relative to the scheduled execution time of the initial execution. If an execution is delayed for any reason (such as garbage collection or other background activity), two or more executions will occur in rapid succession to "catch up.".
- Overview
- Instantiating ExecutorService
- Assigning Tasks to The ExecutorService
- Shutting Down An ExecutorService
- The Future Interface
- The ScheduledExecutorService Interface
- ExecutorService vs Fork/Join
- Conclusion
ExecutorService is a JDK API that simplifies running tasks in asynchronous mode. Generally speaking, ExecutorServiceautomatically provides a pool of threads and an API for assigning tasks to it.
2.1. Factory Methods of the Executors Class
The easiest way to create ExecutorService is to use one of the factory methods of the Executorsclass. For example, the following line of code will create a thread pool with 10 threads: There are several other factory methods to create a predefinedExecutorService that meets specific use cases. To find the best method for your needs, consult Oracle’s official documentation.
2.2. Directly Create an ExecutorService
Because ExecutorService is an interface, an instance of any its implementations can be used. There are several implementations to choose from in the java.util.concurrentpackage, or you can create your own. For example, the ThreadPoolExecutorclass has a few constructors that we can use to configure an executor service and its internal pool: You may notice that the code above is very similar to the source code of the factory method newSingleThreadExecutor(). For most cases, a detailed manual co...
ExecutorService can execute Runnable and Callabletasks. To keep things simple in this article, two primitive tasks will be used. Notice that we use lambda expressions here instead of anonymous inner classes: We can assign tasks to the ExecutorService using several methods including execute(), which is inherited from the Executor interface, and also...
In general, the ExecutorServicewill not be automatically destroyed when there is no task to process. It will stay alive and wait for new work to do. In some cases this is very helpful, such as when an app needs to process tasks that appear on an irregular basis or the task quantity is not known at compile time. On the other hand, an app could reach...
The submit() andinvokeAll() methods return an object or a collection of objects of type Future, which allows us to get the result of a task’s execution or to check the task’s status (is it running). The Future interface provides a special blocking method get(), which returns an actual result of the Callable task’s execution or null in the case of a...
The ScheduledExecutorServiceruns tasks after some predefined delay and/or periodically. Once again, the best way to instantiate a ScheduledExecutorService is to use the factory methods of the Executors class. For this section, we use a ScheduledExecutorServicewith one thread: To schedule a single task’s execution after a fixed delay, use the schedu...
After the release of Java 7, many developers decided to replace the ExecutorServiceframework with the fork/join framework. This is not always the right decision, however. Despite the simplicity and frequent performance gains associated with fork/join, it reduces developer control over concurrent execution. ExecutorService gives the developer the ab...
Despite the relative simplicity of ExecutorService, there are a few common pitfalls. Let’s summarize them: Keeping an unused ExecutorService alive: See the detailed explanation in Section 4 on how to shut down an ExecutorService. Wrong thread-pool capacity while using fixed length thread pool: It is very important to determine how many threads the ...
Aug 18, 2022 · The scheduleAtFixedRate() and scheduleWithFixedDelay() methods create and execute tasks that run periodically until cancelled. Zero and negative delays (but not periods) are also allowed in schedule methods, and are treated as requests for immediate execution.
May 11, 2024 · taskScheduler.scheduleWithFixedDelay( new RunnableTask("Current Date Fixed 1 second Delay"), new Date(), 1000); The RunnableTask will be invoked at the specified execution time, which encompasses the time in which the @PostConstruct method starts, and subsequently with 1000 milliseconds delay.
Mar 11, 2024 · scheduleWithFixedDelay (Runnable command, long initialDelay, long delay, TimeUnit unit) Submits a periodic action that becomes enabled first after the given initial delay, and subsequently with the given delay between the termination of one execution and the commencement of the next.
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Sep 11, 2020 · scheduleAtFixedRate(Runnable command, long initialDelay, long period, TimeUnit unit) Creates and executes a periodic action that becomes enabled first after the given delay and subsequently with the given period. scheduleWithFixedDelay(Runnable command, long initialDelay, long delay, TimeUnit unit)
