What is BlockingQueue in Java with example?
BlockingQueue is a java Queue that support operations that wait for the queue to become non-empty when retrieving and removing an element, and wait for space to become available in the queue when adding an element.
Can you give example implementations of the BlockingQueue interface?
Java provides several BlockingQueue implementations such as LinkedBlockingQueue, ArrayBlockingQueue, PriorityBlockingQueue, SynchronousQueue, etc. Java BlockingQueue interface implementations are thread-safe. All methods of BlockingQueue are atomic in nature and use internal locks or other forms of concurrency control.
How is BlockingQueue implemented in Java?
Here is a simple implementation of a blocking queue:
- public class BlockingQueue {
- private List queue = new LinkedList();
- private int limit = 10;
- public BlockingQueue(int limit) {
- this. limit = limit;
- }
- public synchronized void enqueue(Object item) throws InterruptedException {
- while (this. queue. size() == this.
What is BlockingQueue in Java concurrency?
concurrent. BlockingQueue , represents a queue which is thread safe to put elements into, and take elements out of from. In other words, multiple threads can be inserting and taking elements concurrently from a Java BlockingQueue , without any concurrency issues arising.
What is the max capacity of a Java BlockingQueue?
Here we have a blockingQueue that has a capacity equal to 10. It means that when a producer tries to add an element to an already full queue, depending on a method that was used to add it (offer(), add() or put()), it will block until space for inserting object becomes available. Otherwise, the operations will fail.
What is the difference between queue and BlockingQueue in Java?
This class provides unbounded and thread-safe deque based on linked nodes. It was introduced in Java 7 and implements Deque interface. It does not allow null elements. A blocking queue is a queue which provides insert and remove operations that block or keep waiting until they are performed.
What is role of a BlockingQueue in Executor framework?
BlockingQueue is an integral part of an Executor. BlockingQueue is used for storing the tasks when all the available threads are busy executing tasks and a new thread cannot be created.
Is BlockingQueue synchronized?
No, you do not need to synchronize access to the object properties, or even use volatile on the member variables. All actions performed by a thread before it queues an object on a BlockingQueue “happen-before” the object is dequeued. That means that any changes made by the first thread are visible to the second.
What is BlockingQueue in Java?
Today we will look into Java BlockingQueue. java.util.concurrent.BlockingQueue is a java Queue that support operations that wait for the queue to become non-empty when retrieving and removing an element, and wait for space to become available in the queue when adding an element.
What is an example of a blocking queue?
BlockingQueue A simple BlockingQueueexample, a producer generates data and put it into a queue, at the same time, a consumer takes the data from the same queue. 1.1 Producer – A Runnableobject to put 20 integers into a queue.
How to implement producer consumer problem using Java BlockingQueue?
Let’s implement producer consumer problem using java BlockingQueue now. Just a normal java object that will be produced by Producer and added to the queue. You can also call it as payload or queue message. Producer class that will create messages and put it in the queue.
What is poison pill blocking queue in Java?
BlockingQueue + Poison Pill The “poison pill” is a general solution to stop or interrupt both producer and consumer threads. The idea is the producer put a “poison pill” into the queue and exit, if the “consumer” see the “poison pill” then stop and exit.