转换wait&notifyAll代码以使用Java 1.5 Lock对象

Question

我们使用在代码段周围使用同步块的代码,需要大量的wait和notifyAll()调用.我们正在尝试将这些转换为使用Java 5 Lock.lock()和Lock.unlock()方法.如何迁移此代码以删除所有wait和notifyAll调用.我不知道使用新的锁定功能相当于这些.

任何与示例的链接将不胜感激.

提前致谢

方程式,下面的代码需要转换为使用Lock.lock()和lock.unlock删除synchronized块的第一部分很简单,因为我只需要调用lock()方法.问题是可以为notifyAll()和wait方法做些什么.

     synchronized( LOCK )
            {
                while( !Thread.interrupted() )
                {
                 try
                    {

                        working = runRules();

                        if( !working )
                            LOCK.notifyAll();

                        LOCK.wait( working ? shortTimeout : longTimeout );
                    }
                    catch( final InterruptedException e )
                    {
                        Package.log.info( "Thread was interrupted.  Exiting.", e );
                        return;
                    }
                }
            }

Answer 1

使用包Condition提供java.util.concurrent.locks的s:

 final Object monitor = ...

 ...

 synchronized (monitor) {

     while (!condition) monitor.wait();
     ... do something ...
 }

变为:

 final ReentrantLock lock = ...;
 final Condition cvar = lock.newCondition();

 ...

 lock.lock();

 try {

     while (!condition) cvar.await();
     ... do something ... 

 } finally {

     lock.unlock();
 }

信令方面非常相似:

 synchronized (monitor) {

      ... do something ...
      monitor.notify();
 }

变为:

 lock.lock();

 try {

     ... do something ...
     cvar.signalAll();

 } finally {

     lock.unlock();
 }