Every EventList has a method getReadWriteLock() that can be used to provide concurrent access to the list. Read/Write locks are designed to allow access for either multiple readers or a single writer. All locks in Glazed Lists are reentrant so that a single thread can lock() multiple times.

To read from a list that is being read or written by a different thread:

  EventList myList = ...
  myList.getReadWriteLock().readLock().lock();
  try {
    // perform read operations like myList.size() and myList.get()
  } finally {
    myList.getReadWriteLock().readLock().unlock();
  }      
    

To write from a list that is being read or written by a different thread:

  EventList myList = ...
  myList.getReadWriteLock().writeLock().lock();
  try {
    // perform write operations like myList.set() and myList.clear()
  } finally {
    myList.getReadWriteLock().writeLock().unlock();
  }