Examples of Lockable

cz.cuni.mff.abacs.burglar.logics.objects.positions.Lockable
Interface of objects that can be opened, closed, locked, unlocked. @author abacs
org.apache.derby.iapi.services.locks.Lockable
Any object that needs to be locked must implement Lockable. This allows a generic lock manager that can have locking policies defined on a per-object basis. A request to lock the object takes a qualifier, this qualifier may be used the object to implement a complex locking policy, e.g. traditional database shared, update and exclusive locks.
The lock manager uses this ordered protocol to determine if a lock request on a Lockable L with qualifier Q1 in compatibility space CS1 can be granted:
1. If no locks are held on L in any compatability space then the request is granted.
2. If L.requestCompatible(Q1) returns true then the lock is granted.
3. Otherwise the request is granted if the following expression evaluates to true for every other lock { CSn, Qn} held on L
  - ```
      ( ( CSn == CS1 ) && L.lockerAlwaysCompatible() ) 
```
- ```
 || (L.reqestCompatible(Q1, Qn)) 
```
If the request is granted then a call is made to L.lockEvent(CS1, Q1) .
When the lock is released a call is made to L.unlockEvent(CS1, Q1) .
The lock manager uses equals() and hashCode() to identify unique Lockables.
If the class implementing Lockable requires that each instance of class correspond to a different locked object then the equals() method must test equality via the reference equality test (==), this is the default behaviour for equality.
If the class implementing Lockable require that each instance of the class that has the same value (as defined by the class) corresponds to a locked object then its equals() method must reflect that, e.g. by testing equality of its fields. In this case the first Lockable to be locked will be kept by lock manager as the key for the lock. Thus even after the first caller unlocks the object, its reference will still be kept by the lock manager. Thus Lockable's that per value equality must be designed so that they are never re-used for different lockable concepts.
In either case the equals() method must accept a reference to an object of a different type.
As per standard hashtable rules the value returned by hashCode() must be in sync with the equals() method.
MT - Mutable - : single thread required, synchronization is provided by the lock manager. If the class implementing Lockable uses value equality then it must have an immutable identity.
org.apache.jackrabbit.ocm.testmodel.Lockable
@author Lombart Christophe
org.hibernate.persister.entity.Lockable
Contract for things that can be locked via a {@link org.hibernate.dialect.lock.LockingStrategy}.
Currently only the root table gets locked, except for the case of HQL and Criteria queries against dialects which do not support either (1) FOR UPDATE OF or (2) support hint locking (in which case *all* queried tables would be locked). @author Steve Ebersole @since 3.2
org.springframework.aop.framework.Lockable
Simple interface to use for mixins @author Rod Johnson
test.aop.Lockable
Simple interface to use for mixins @author Rod Johnson
test.mixin.Lockable
Simple interface to use for mixins @author Rod Johnson

Examples of org.springframework.aop.framework.Lockable

  }
  
  @SuppressWarnings("unchecked")
  public void testIntroductionOnTargetImplementingInterface() {
    CannotBeUnlocked target = new CannotBeUnlocked();
    Lockable proxy = (Lockable) createProxy(target,
        // Ensure that we exclude
        AopUtils.findAdvisorsThatCanApply(
            getFixture().getAdvisors(
                new SingletonMetadataAwareAspectInstanceFactory(new MakeLockable(), "someBean")),
            CannotBeUnlocked.class
        ),
        CannotBeUnlocked.class);
    assertTrue(proxy instanceof Lockable);
    Lockable lockable = (Lockable) proxy;
    assertTrue("Already locked", lockable.locked());
    lockable.lock();
    assertTrue("Real target ignores locking", lockable.locked());
    try {
      lockable.unlock();
      fail();
    }
    catch (UnsupportedOperationException ex) {
      // Ok
    }

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Examples of org.springframework.aop.framework.Lockable

    
    Modifiable modifiable = (Modifiable) createProxy(target,
        advisors,
        ITestBean.class);
    assertTrue(modifiable instanceof Modifiable);
    Lockable lockable = (Lockable) modifiable;
    assertFalse(lockable.locked());
    
    ITestBean itb = (ITestBean) modifiable;
    assertFalse(modifiable.isModified());
    int oldAge = itb.getAge();
    itb.setAge(oldAge + 1);
    assertTrue(modifiable.isModified());
    modifiable.acceptChanges();
    assertFalse(modifiable.isModified());
    itb.setAge(itb.getAge());
    assertFalse("Setting same value does not modify", modifiable.isModified());
    itb.setName("And now for something completely different");
    assertTrue(modifiable.isModified());
    
    lockable.lock();
    assertTrue(lockable.locked());
    try {
      itb.setName("Else");
      fail("Should be locked");
    }
    catch (IllegalStateException ex) {
      // Ok
    }
    lockable.unlock();
    itb.setName("Tony");
  }

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Examples of test.aop.Lockable

    NotLockable notLockable1 = (NotLockable) createProxy(notLockableTarget,
        getFixture().getAdvisors(
            new SingletonMetadataAwareAspectInstanceFactory(new MakeLockable(),"someBean")),
        NotLockable.class);
    assertTrue(notLockable1 instanceof Lockable);
    Lockable lockable = (Lockable) notLockable1;
    assertFalse(lockable.locked());
    lockable.lock();
    assertTrue(lockable.locked());


    NotLockable notLockable2Target = new NotLockable();
    NotLockable notLockable2 = (NotLockable) createProxy(notLockable2Target,
        getFixture().getAdvisors(
            new SingletonMetadataAwareAspectInstanceFactory(new MakeLockable(),"someBean")),
        NotLockable.class);
    assertTrue(notLockable2 instanceof Lockable);
    Lockable lockable2 = (Lockable) notLockable2;
    assertFalse(lockable2.locked());
    notLockable2.setIntValue(1);
    lockable2.lock();
    try {
      notLockable2.setIntValue(32);
      fail();
    }
    catch (IllegalStateException ex) {
    }
    assertTrue(lockable2.locked());
  }

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Examples of test.mixin.Lockable

    int newAge = 65;
    ITestBean itb = (ITestBean) createProxy(pc);
    itb.setAge(newAge);
    assertTrue(itb.getAge() == newAge);


    Lockable lockable = (Lockable) itb;
    assertFalse(lockable.locked());
    lockable.lock();


    assertTrue(itb.getAge() == newAge);
    try {
      itb.setAge(1);
      fail("Setters should fail when locked");
    }
    catch (LockedException ex) {
      // ok
    }
    assertTrue(itb.getAge() == newAge);


    // Unlock
    assertTrue(lockable.locked());
    lockable.unlock();
    itb.setAge(1);
    assertTrue(itb.getAge() == 1);
  }

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