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| <h2 title="Class ContainmentCycleException" class="title">Class ContainmentCycleException</h2> |
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| <pre>public class <span class="typeNameLabel">ContainmentCycleException</span> |
| extends <a href="../../../../../org/eclipse/emf/cdo/util/ConcurrentAccessException.html" title="class in org.eclipse.emf.cdo.util">ConcurrentAccessException</a></pre> |
| <div class="block">A <a href="../../../../../org/eclipse/emf/cdo/util/ConcurrentAccessException.html" title="class in org.eclipse.emf.cdo.util"><code>concurrent access exception</code></a> that indicates an attempt of the local transaction to introduce a <i>containment cycle</i>. |
| A containment cycle is an effect of a network race condition between two transactions that commit changes to possibly disjunct sets of objects. As a result |
| the overall tree structure of the model would be destroyed in a way that the tree root would no longer be reachable from objects involved in the containment cycle. |
| Commits that attempt to introduce containment cycles are detected by the repository and canceled. Note that locking all involved <b>dirty</b> objects |
| does not properly address the problem because the involved container objects may not be dirty. |
| <p> |
| It's usually possible and adequate to <a href="../../../../../org/eclipse/emf/cdo/transaction/CDOUserTransaction.html#rollback--"><code>rollback</code></a> the transaction, <i>replay</i> the model modifications and |
| commit the transaction again (optimistic strategy). Pessimistic locks on the dirty objects can not safely avoid the problem; you must expect this exception to occur.</div> |
| <dl> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>4.2</dd> |
| <dt><span class="simpleTagLabel">Author:</span></dt> |
| <dd>Eike Stepper</dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
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| <pre>public ContainmentCycleException(java.lang.String message)</pre> |
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