This Java program solves the Producer-Consumer problem using threads and ArrayBlockingQueue which is an implementation of the BlockingQueue interface.
- Refer Producer-Consumer Java Program Using wait notify to see how to solve producer-consumer problem using wait notify.
- Refer Producer-Consumer Java Program Using volatile to see how to solve producer-consumer problem using volatile keyword.
Initial capacity of the ArrayBlockingQueue will be kept one so that producer and consumer both get a chance alternatively.
Values will be inserted in the ArrayBlockingQueue using put() method, which will block if the space is full.
Values will be retrieved from the ArrayBlockingQueue using take() method, which retrieves and removes the head of this queue, waiting if necessary until an element becomes available.
In the program there is a class Buffer which is shared by both threads. In comparison to produce-consumer using wait notify this version using blocking queue is much simpler as you don't need to write the logic for making the thread wait or notifying the waiting thread.
Producer-Consumer program in Java Using ArrayBlockingQueue
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
public class ArrayBQDemo {
public static void main(String[] args) {
Buffer buffer = new Buffer();
// Starting two threads
ExecutorService executor = Executors.newFixedThreadPool(2);
executor.execute(new ProdTask(buffer));
executor.execute(new ConTask(buffer));
executor.shutdown();
}
}
class ProdTask implements Runnable{
Buffer buffer;
ProdTask(Buffer buffer){
this.buffer = buffer;
}
@Override
public void run() {
for(int i = 0; i < 5; i++){
buffer.put(i);
}
}
}
class ConTask implements Runnable{
Buffer buffer;
ConTask(Buffer buffer){
this.buffer = buffer;
}
@Override
public void run() {
for(int i = 0; i < 5; i++){
buffer.get();;
}
}
}
//Shared class used by threads
class Buffer{
int i;
// Bouded ArrayBlockingQueue of size 1
BlockingQueue<Integer> arrayBlockingQ = new ArrayBlockingQueue<Integer>(1);
public void get(){
try {
// take method to get from blockingqueue
System.out.println("Consumer recd - " + arrayBlockingQ.take());
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void put(int i){
this.i = i;
try {
// putting in blocking queue
arrayBlockingQ.put(i);
System.out.println("Putting - " + i);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
Output
Putting - 0 Consumer recd - 0 Putting - 1 Consumer recd - 1 Putting - 2 Consumer recd - 2 Putting - 3 Consumer recd - 3 Putting - 4 Consumer recd - 4
That's all for this topic Producer-Consumer Java Program Using ArrayBlockingQueue. If you have any doubt or any suggestions to make please drop a comment. Thanks!
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