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Blocking Queue example of limited connection pool

private BlockingQueue<Connection> pool = new ArrayBlockingQueue<Connection>(10);
private AtomicInteger connCount = new AtomicInteger();
public Connection getConnection() {
    Connection conn = pool.poll(5, TimeUnit.SECONDS);
    if (conn == null) {

  synchronized (connCount) {

if (connCount.get() < 10) {

    conn = getNewConnection();





  if (conn == null) {

throw new ConnUnavailException();

  } else {

return conn;


Related Article:

Reference: Java Concurrency Part 5 – Blocking Queues from our JCG partners at the Carfey Software blog

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