java method synchronization and read/write mutual exclusion

Question

I have two methods read() and write() as below in a class.

class Store
{

  public void write()
  {
    // write to store;
  }

  publi         


        

Answer 1

The best option in this case is to use a reader-writer lock: ReadWriteLock. It allows a single writer, but multiple concurrent readers, so it's the most efficient mechanism for this type of scenario.

Some sample code:

class Store
{
    private ReadWriteLock rwlock = new ReentrantReadWriteLock();

    public void write()
    {
       rwlock.writeLock().lock();
       try {
          write to store;
       } finally {
          rwlock.writeLock().unlock();
       }
    }

    public String read()
    {
       rwlock.readLock().lock();
       try {
          read from store;
       } finally {
          rwlock.readLock().unlock();
       }
    }
}