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/**
* Copyright (c) 2004 - 2010 Eike Stepper (Berlin, Germany) and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Eike Stepper - initial API and implementation
* Simon McDuff - bug 201266
* Simon McDuff - bug 233314
* Simon McDuff - bug 247143
*/
package org.eclipse.emf.cdo.transaction;
import org.eclipse.emf.cdo.CDOObject;
import org.eclipse.emf.cdo.common.revision.delta.CDOFeatureDelta;
import org.eclipse.emf.cdo.view.CDOView;
/**
* @author Eike Stepper
* @since 2.0
*/
public interface CDOTransactionHandler
{
/**
* Called by a <code>CDOTransaction</code> <b>before</b> an object is added. The implementor of this method is allowed
* to throw an unchecked exception that will propagate up to the operation that is about to add the object (thereby
* preventing the operation from successful completion).
* <p>
* <b>Note:</b> Implementors <b>must not</b> start threads which access the {@link CDOView view} and wait for their
* completion since deadlocks can result. The following example causes a deadlock:<br>
*
* <pre>
* getDisplay().syncExec(new Runnable()
* {
* public void run()
* {
* try
* {
* cdoObject.getName();
* }
* catch (Exception ignore)
* {
* }
* }
* });
* </pre>
*
* If you need to synchronously execute threads which access the {@link CDOView view} you should use
* {@link CDOAsyncTransactionHandler}.
*/
public void attachingObject(CDOTransaction transaction, CDOObject object);
/**
* Called by a <code>CDOTransaction</code> <b>before</b> an object is detached. The implementor of this method is
* allowed to throw an unchecked exception that will propagate up to the operation that is about to remove the object
* (thereby preventing the operation from completing successfully).
* <p>
* <b>Note:</b> Implementors <b>must not</b> start threads which access the {@link CDOView view} and wait for their
* completion since deadlocks can result. The following example causes a deadlock:<br>
*
* <pre>
* getDisplay().syncExec(new Runnable()
* {
* public void run()
* {
* try
* {
* cdoObject.getName();
* }
* catch (Exception ignore)
* {
* }
* }
* });
* </pre>
*
* If you need to synchronously execute threads which access the {@link CDOView view} you should use
* {@link CDOAsyncTransactionHandler}.
*/
public void detachingObject(CDOTransaction transaction, CDOObject object);
/**
* Called by a <code>CDOTransaction</code> <b>before</b> an object is modified. The implementor of this method is
* allowed to throw an unchecked exception that will propagate up to the operation that is about to modify the object
* (thereby preventing the operation from completing successfully).
* <p>
* <b>Note:</b> Implementors <b>must not</b> start threads which access the {@link CDOView view} and wait for their
* completion since deadlocks can result. The following example causes a deadlock:<br>
*
* <pre>
* getDisplay().syncExec(new Runnable()
* {
* public void run()
* {
* try
* {
* cdoObject.getName();
* }
* catch (Exception ignore)
* {
* }
* }
* });
* </pre>
*
* If you need to synchronously execute threads which access the {@link CDOView view} you should use
* {@link CDOAsyncTransactionHandler}.
*/
public void modifyingObject(CDOTransaction transaction, CDOObject object, CDOFeatureDelta featureDelta);
/**
* Called by a <code>CDOTransaction</code> <b>before</b> it is being committed. The implementor of this method is
* allowed to throw an unchecked exception that will propagate up to the operation that is about to commit the
* transaction (thereby preventing the operation from completing successfully).
*/
public void committingTransaction(CDOTransaction transaction, CDOCommitContext commitContext);
/**
* Called by a <code>CDOTransaction</code> <b>after</b> it is being committed. The implementor of this method is
* <b>not</b> allowed to throw an unchecked exception.
*/
public void committedTransaction(CDOTransaction transaction, CDOCommitContext commitContext);
/**
* Called by a <code>CDOTransaction</code> <b>after</b> it is rolled back. If the implementor of this method throws an
* exception it will be logged as an error and subsequent handlers will be further called.
*/
public void rolledBackTransaction(CDOTransaction transaction);
}
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