1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/samples/privilegedcreator/src/org/apidesign/privileged/api/Mutex.java	Mon May 25 18:27:02 2009 +0200
     1.3 @@ -0,0 +1,52 @@
     1.4 +/*
     1.5 + * To change this template, choose Tools | Templates
     1.6 + * and open the template in the editor.
     1.7 + */
     1.8 +
     1.9 +package org.apidesign.privileged.api;
    1.10 +
    1.11 +import java.util.concurrent.locks.Lock;
    1.12 +import java.util.concurrent.locks.ReentrantLock;
    1.13 +
    1.14 +/**
    1.15 + *
    1.16 + * @author Jaroslav Tulach <jaroslav.tulach@netbeans.org>
    1.17 + */
    1.18 +// BEGIN: mutex.api
    1.19 +public class Mutex {
    1.20 +    Lock lock = new ReentrantLock();
    1.21 +    
    1.22 +    public Mutex() {
    1.23 +    }
    1.24 +    
    1.25 +    public void readAccess(Runnable r) {
    1.26 +        try {
    1.27 +            lock.lock();
    1.28 +            r.run();
    1.29 +        } finally {
    1.30 +            lock.unlock();
    1.31 +        }
    1.32 +    }
    1.33 +// FINISH: mutex.api
    1.34 +
    1.35 +// BEGIN: mutex.privileged.api
    1.36 +    public Mutex(Privileged privileged) {
    1.37 +        if (privileged.mutex != null) {
    1.38 +            throw new IllegalStateException();
    1.39 +        }
    1.40 +        privileged.mutex = this;
    1.41 +    }
    1.42 +    
    1.43 +    public static final class Privileged {
    1.44 +        private Mutex mutex;
    1.45 +        
    1.46 +        public void enterReadAccess() {
    1.47 +            mutex.lock.lock();
    1.48 +        }
    1.49 +        
    1.50 +        public void exitReadAccess() {
    1.51 +            mutex.lock.unlock();
    1.52 +        }
    1.53 +    }
    1.54 +// END: mutex.privileged.api
    1.55 +}