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| public class BigLockCalculator extends CalculatorBase { | |
| private interface Status { | |
| int NotStarted =1; | |
| int Starting =2; | |
| int Started =3; | |
| int Disposed =4; | |
| } | |
| private AtomicInteger _status = new AtomicInteger(Status.NotStarted); | |
| private AtomicInteger _disposingFlag = new AtomicInteger(0); | |
| private AtomicInteger _startingFlag = new AtomicInteger(0); | |
| public override void Start() { | |
| if(_status.get() != Status.NotStarted ) { | |
| return; | |
| } | |
| if( _startingFlag.compareAndSwap(0,1)) { | |
| try { | |
| if(_status.compareAndSwap(Status.NotStarted, Status.Starting)) { | |
| StartCore(); | |
| if(!_status.compareAndSwap(Status.Starting, Status.Started)) { | |
| if(_status.get() == Status.Disposed ) { | |
| DisposeCore(); | |
| return; | |
| } | |
| } | |
| } | |
| }finally { | |
| _startingFlag.compareAndSwap(1,0); | |
| } | |
| } | |
| } | |
| public override void Dispose() { | |
| if(_status.get() == Status.Disposed) { | |
| return; | |
| } | |
| if( _disposingFlag.compareAndSwap(0,1)) { | |
| try { | |
| while(true) { | |
| int currentStatus =_status.get(); | |
| if(currentStatus == Status.Disposed) { | |
| return; | |
| } | |
| if(currentStatus == Status.NotStarted && _status.compareAndSwap(currentStatus, Status.Disposed )) { | |
| return; | |
| }else if(currentStatus == Status.Starting && _status.compareAndSwap(currentStatus, Status.Disposed )){ | |
| return; | |
| }else if(currentStatus == Status.Started && _status.compareAndSwap(currentStatus, Status.Disposed )){ | |
| DisposeCore(); | |
| } | |
| } | |
| }finally { | |
| _disposingFlag.compareAndSwap(1,0); | |
| } | |
| } | |
| } | |
| } |
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