What is executor framework?
The executor framework is an implementation of the Producer-Consumer pattern. The java. util. concurrent. Executors class provides a set of methods for creating ThreadPools of worker threads.
Why do we use executor framework?
Why use it? The Executor Framework contains a bunch of components that are used to efficiently manage multiple threads. It was released with the JDK 5 which is used to run the Runnable objects without creating new threads every time and also mostly re-using the already created threads.
What is executor framework and Cachedthreadpool?
Single Thread Executor : A thread pool with only one thread. So all the submitted tasks will be executed sequentially. Method : Executors. newSingleThreadExecutor() Cached Thread Pool : A thread pool that creates as many threads it needs to execute the task in parrallel.
What is executor execute?
Execute Method: This function executes the given command at some time in the future. The command may execute in a new thread, in a pooled thread, or in the calling thread, at the discretion of the Executor implementation. This method is a void method meaning it doesn’t return any function.
What design pattern does the executor framework use?
It is Mediator pattern coupled with Command pattern. Executor interface is command pattern.
Why do we need ExecutorService?
The ExecutorService helps in maintaining a pool of threads and assigns them tasks. It also provides the facility to queue up tasks until there is a free thread available if the number of tasks is more than the threads available.
What are the advantages of using ManagedScheduledExecutorService?
ManagedScheduledExecutorService builds on top of the ManagedExecutorService and provides support for scheduling tasks to be executed in future and also to submit tasks which repeat after some interval. It also provides the support provided by ManagedExecutorService .
How many types of Executors are there?
Executor Interfaces define the three executor object types. Thread Pools are the most common kind of executor implementation. Fork/Join is a framework (new in JDK 7) for taking advantage of multiple processors.
What is difference between newFixedThreadPool and newCachedThreadPool?
In terms of resources, the newFixedThreadPool will keep all the threads running until they are explicitly terminated. In the newCachedThreadPool Threads that have not been used for sixty seconds are terminated and removed from the cache. Given this, the resource consumption will depend very much in the situation.
What is Executors newFixedThreadPool?
The newFixedThreadPool() method of Executors class creates a thread pool that reuses a fixed number of threads operating off a shared unbounded queue. If additional tasks are submitted when all threads are active, they will wait in the queue until a thread is available.
What is future in Executor framework?
Future interface has methods to obtain the result generated by a Callable object and manage its state. It represents the result of an asynchronous computation. The result can only be retrieved using method get() when the computation has completed, blocking if necessary until it is ready.
What are the methods provided by Executor interface?
Interface Executor An object that executes submitted Runnable tasks. This interface provides a way of decoupling task submission from the mechanics of how each task will be run, including details of thread use, scheduling, etc. An Executor is normally used instead of explicitly creating threads.
What is executor framework in a framework?
A framework having a bunch of components that are used for managing worker threads efficiently is referred to as Executor Framework. The Executor API reduces the execution of the task from the actual task to be executed through the Executors. The executor framework is an implementation of the Producer-Consumer pattern.
What is the use of executor in Java?
This design is one of the implementations of the Producer-Consumer pattern. The java.util.concurrent.Executors provide factory methods which are be used to create ThreadPools of worker threads. To use the Executor Framework we need to create one such thread pool and submit the task to it for execution.
What is the use of executor API?
The Executor API de-couples the execution of task from the actual task to be executed via Executors. This design is one of the implementations of the Producer-Consumer pattern. The java.util.concurrent.Executors provide factory methods which are be used to create ThreadPools of worker threads.
What is executor API in JDK 5?
It was released with the JDK 5 which is used to run the Runnable objects without creating new threads every time and also mostly re-using the already created threads. This Executor API de-couples the execution of a task from the actual task to be executed with the help of an Executor.