| /* |
| * Copyright (c) 2008, 2011, 2012 Eike Stepper (Berlin, Germany) and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * Eike Stepper - initial API and implementation |
| */ |
| package org.eclipse.net4j.util.concurrent; |
| |
| import java.util.Collection; |
| import java.util.Iterator; |
| import java.util.LinkedList; |
| import java.util.List; |
| import java.util.concurrent.locks.ReadWriteLock; |
| import java.util.concurrent.locks.ReentrantReadWriteLock; |
| |
| /** |
| * @author Eike Stepper |
| */ |
| public final class RoundRobinList<E> extends LinkedList<E> |
| { |
| private static final long serialVersionUID = 1L; |
| |
| private ReadWriteLock lock = new ReentrantReadWriteLock(); |
| |
| private Iterator<E> it; |
| |
| public RoundRobinList() |
| { |
| } |
| |
| public RoundRobinList(Collection<? extends E> c) |
| { |
| super(c); |
| } |
| |
| public void executeReads(Runnable runnable) |
| { |
| try |
| { |
| lock.readLock().lock(); |
| runnable.run(); |
| } |
| finally |
| { |
| lock.readLock().unlock(); |
| } |
| } |
| |
| public void executeWrites(Runnable runnable) |
| { |
| try |
| { |
| lock.writeLock().lock(); |
| runnable.run(); |
| } |
| finally |
| { |
| lock.writeLock().unlock(); |
| } |
| } |
| |
| @Override |
| public void add(int index, E element) |
| { |
| try |
| { |
| lock.writeLock().lock(); |
| super.add(index, element); |
| it = null; |
| } |
| finally |
| { |
| lock.writeLock().unlock(); |
| } |
| } |
| |
| @Override |
| public boolean add(E o) |
| { |
| try |
| { |
| lock.writeLock().lock(); |
| it = null; |
| return super.add(o); |
| } |
| finally |
| { |
| lock.writeLock().unlock(); |
| } |
| } |
| |
| @Override |
| public boolean addAll(Collection<? extends E> c) |
| { |
| try |
| { |
| lock.writeLock().lock(); |
| it = null; |
| return super.addAll(c); |
| } |
| finally |
| { |
| lock.writeLock().unlock(); |
| } |
| } |
| |
| @Override |
| public boolean addAll(int index, Collection<? extends E> c) |
| { |
| try |
| { |
| lock.writeLock().lock(); |
| it = null; |
| return super.addAll(index, c); |
| } |
| finally |
| { |
| lock.writeLock().unlock(); |
| } |
| } |
| |
| @Override |
| public void addFirst(E o) |
| { |
| try |
| { |
| lock.writeLock().lock(); |
| it = null; |
| super.addFirst(o); |
| } |
| finally |
| { |
| lock.writeLock().unlock(); |
| } |
| } |
| |
| @Override |
| public void addLast(E o) |
| { |
| try |
| { |
| lock.writeLock().lock(); |
| it = null; |
| super.addLast(o); |
| } |
| finally |
| { |
| lock.writeLock().unlock(); |
| } |
| } |
| |
| @Override |
| public void clear() |
| { |
| try |
| { |
| lock.writeLock().lock(); |
| it = null; |
| super.clear(); |
| } |
| finally |
| { |
| lock.writeLock().unlock(); |
| } |
| } |
| |
| @Override |
| public Object clone() |
| { |
| try |
| { |
| lock.readLock().lock(); |
| return super.clone(); |
| } |
| finally |
| { |
| lock.readLock().unlock(); |
| } |
| } |
| |
| @Override |
| public boolean contains(Object o) |
| { |
| try |
| { |
| lock.readLock().lock(); |
| return super.contains(o); |
| } |
| finally |
| { |
| lock.readLock().unlock(); |
| } |
| } |
| |
| @Override |
| public boolean containsAll(Collection<?> c) |
| { |
| try |
| { |
| lock.readLock().lock(); |
| return super.containsAll(c); |
| } |
| finally |
| { |
| lock.readLock().unlock(); |
| } |
| } |
| |
| @Override |
| public E element() |
| { |
| try |
| { |
| lock.readLock().lock(); |
| if (isEmpty()) |
| { |
| return null; |
| } |
| |
| if (it == null || !it.hasNext()) |
| { |
| it = iterator(); |
| } |
| |
| return it.next(); |
| } |
| finally |
| { |
| lock.readLock().unlock(); |
| } |
| } |
| |
| @Override |
| public E get(int index) |
| { |
| try |
| { |
| lock.readLock().lock(); |
| return super.get(index); |
| } |
| finally |
| { |
| lock.readLock().unlock(); |
| } |
| } |
| |
| @Override |
| public E getFirst() |
| { |
| try |
| { |
| lock.readLock().lock(); |
| return super.getFirst(); |
| } |
| finally |
| { |
| lock.readLock().unlock(); |
| } |
| } |
| |
| @Override |
| public E getLast() |
| { |
| try |
| { |
| lock.readLock().lock(); |
| return super.getLast(); |
| } |
| finally |
| { |
| lock.readLock().unlock(); |
| } |
| } |
| |
| @Override |
| public int indexOf(Object o) |
| { |
| try |
| { |
| lock.readLock().lock(); |
| return super.indexOf(o); |
| } |
| finally |
| { |
| lock.readLock().unlock(); |
| } |
| } |
| |
| @Override |
| public int lastIndexOf(Object o) |
| { |
| try |
| { |
| lock.readLock().lock(); |
| return super.lastIndexOf(o); |
| } |
| finally |
| { |
| lock.readLock().unlock(); |
| } |
| } |
| |
| @Override |
| public boolean offer(E o) |
| { |
| try |
| { |
| lock.writeLock().lock(); |
| it = null; |
| return super.offer(o); |
| } |
| finally |
| { |
| lock.writeLock().unlock(); |
| } |
| } |
| |
| @Override |
| public E peek() |
| { |
| try |
| { |
| lock.readLock().lock(); |
| return super.peek(); |
| } |
| finally |
| { |
| lock.readLock().unlock(); |
| } |
| } |
| |
| @Override |
| public E poll() |
| { |
| try |
| { |
| lock.writeLock().lock(); |
| it = null; |
| return super.poll(); |
| } |
| finally |
| { |
| lock.writeLock().unlock(); |
| } |
| } |
| |
| @Override |
| public E remove() |
| { |
| try |
| { |
| lock.writeLock().lock(); |
| it = null; |
| return super.remove(); |
| } |
| finally |
| { |
| lock.writeLock().unlock(); |
| } |
| } |
| |
| @Override |
| public E remove(int index) |
| { |
| try |
| { |
| lock.writeLock().lock(); |
| it = null; |
| return super.remove(index); |
| } |
| finally |
| { |
| lock.writeLock().unlock(); |
| } |
| } |
| |
| @Override |
| public boolean remove(Object o) |
| { |
| try |
| { |
| lock.writeLock().lock(); |
| it = null; |
| return super.remove(o); |
| } |
| finally |
| { |
| lock.writeLock().unlock(); |
| } |
| } |
| |
| @Override |
| public boolean removeAll(Collection<?> c) |
| { |
| try |
| { |
| lock.writeLock().lock(); |
| it = null; |
| return super.removeAll(c); |
| } |
| finally |
| { |
| lock.writeLock().unlock(); |
| } |
| } |
| |
| @Override |
| public E removeFirst() |
| { |
| try |
| { |
| lock.writeLock().lock(); |
| it = null; |
| return super.removeFirst(); |
| } |
| finally |
| { |
| lock.writeLock().unlock(); |
| } |
| } |
| |
| @Override |
| public E removeLast() |
| { |
| try |
| { |
| lock.writeLock().lock(); |
| it = null; |
| return super.removeLast(); |
| } |
| finally |
| { |
| lock.writeLock().unlock(); |
| } |
| } |
| |
| @Override |
| public boolean retainAll(Collection<?> c) |
| { |
| try |
| { |
| lock.writeLock().lock(); |
| it = null; |
| return super.retainAll(c); |
| } |
| finally |
| { |
| lock.writeLock().unlock(); |
| } |
| } |
| |
| @Override |
| public E set(int index, E element) |
| { |
| try |
| { |
| lock.writeLock().lock(); |
| it = null; |
| return super.set(index, element); |
| } |
| finally |
| { |
| lock.writeLock().unlock(); |
| } |
| } |
| |
| @Override |
| public List<E> subList(int fromIndex, int toIndex) |
| { |
| try |
| { |
| lock.readLock().lock(); |
| return super.subList(fromIndex, toIndex); |
| } |
| finally |
| { |
| lock.readLock().unlock(); |
| } |
| } |
| |
| @Override |
| public Object[] toArray() |
| { |
| try |
| { |
| lock.readLock().lock(); |
| return super.toArray(); |
| } |
| finally |
| { |
| lock.readLock().unlock(); |
| } |
| } |
| |
| @Override |
| public <T> T[] toArray(T[] a) |
| { |
| try |
| { |
| lock.readLock().lock(); |
| return super.toArray(a); |
| } |
| finally |
| { |
| lock.readLock().unlock(); |
| } |
| } |
| } |