| /* |
| * Copyright (c) 2010-2012 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; |
| |
| /** |
| * A call-back interface that is called by a {@link CDOTransaction transaction} before {@link CDOObject objects} are |
| * attached, modified or detached. |
| * |
| * @see CDOPostEventTransactionHandler |
| * @author Eike Stepper |
| * @since 4.0 |
| */ |
| public interface CDOTransactionHandler1 extends CDOTransactionHandlerBase |
| { |
| /** |
| * 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); |
| } |