/guava/android/guava/src/com/google/common/util/concurrent/CycleDetectingLockFactory.java
lockStateChanged( this) ;lockStateChanged( readWriteLock) ;
lockStateChanged ( readWriteLock ) ;
@Override public boolean tryLock() { aboutToAcquire(readWriteLock); try { return super.tryLock(); } finally { <extra_id_0> } } @Override public boolean tryLock(long timeout, TimeUnit unit) throws InterruptedException { aboutToAcquire(readWriteLock); try {