| /***************************************************************** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| ****************************************************************/ |
| |
| package org.apache.cayenne.access; |
| |
| import java.util.Collections; |
| import java.util.Iterator; |
| import java.util.Map; |
| |
| import org.apache.cayenne.Cayenne; |
| import org.apache.cayenne.CayenneRuntimeException; |
| import org.apache.cayenne.DataRow; |
| import org.apache.cayenne.ObjectContext; |
| import org.apache.cayenne.ObjectId; |
| import org.apache.cayenne.exp.Expression; |
| import org.apache.cayenne.exp.ExpressionFactory; |
| import org.apache.cayenne.map.DbAttribute; |
| import org.apache.cayenne.map.DbEntity; |
| import org.apache.cayenne.query.SelectQuery; |
| |
| /** |
| * An exception thrown on optimistic lock failure. |
| * |
| * @since 1.1 |
| */ |
| public class OptimisticLockException extends CayenneRuntimeException { |
| |
| protected ObjectId failedObjectId; |
| protected String querySQL; |
| protected DbEntity rootEntity; |
| protected Map qualifierSnapshot; |
| |
| public OptimisticLockException(ObjectId id, DbEntity rootEntity, String querySQL, |
| Map qualifierSnapshot) { |
| super("Optimistic Lock Failure"); |
| |
| this.failedObjectId = id; |
| this.rootEntity = rootEntity; |
| this.querySQL = querySQL; |
| this.qualifierSnapshot = (qualifierSnapshot != null) |
| ? qualifierSnapshot |
| : Collections.EMPTY_MAP; |
| } |
| |
| public Map getQualifierSnapshot() { |
| return qualifierSnapshot; |
| } |
| |
| public String getQuerySQL() { |
| return querySQL; |
| } |
| |
| /** |
| * Retrieves fresh snapshot for the failed row. Null row indicates that it was |
| * deleted. |
| * |
| * @since 3.0 |
| */ |
| public Map<?, ?> getFreshSnapshot(ObjectContext context) { |
| |
| Expression qualifier = null; |
| for (DbAttribute attribute : rootEntity.getPrimaryKeys()) { |
| Expression attributeQualifier = ExpressionFactory.matchDbExp( |
| attribute.getName(), |
| qualifierSnapshot.get(attribute.getName())); |
| |
| qualifier = (qualifier != null) |
| ? qualifier.andExp(attributeQualifier) |
| : attributeQualifier; |
| } |
| |
| SelectQuery<DataRow> query = new SelectQuery<DataRow>(rootEntity, qualifier); |
| query.setFetchingDataRows(true); |
| return (Map<?, ?>) Cayenne.objectForQuery(context, query); |
| } |
| |
| /** |
| * Returns descriptive message for this exception. |
| */ |
| @Override |
| public String getMessage() { |
| StringBuffer buffer = new StringBuffer(super.getMessage()); |
| |
| if (querySQL != null) { |
| buffer.append(", SQL: [").append(querySQL.trim()).append("]"); |
| } |
| |
| if (!qualifierSnapshot.isEmpty()) { |
| buffer.append(", WHERE clause bindings: ["); |
| Iterator it = qualifierSnapshot.entrySet().iterator(); |
| while (it.hasNext()) { |
| Map.Entry entry = (Map.Entry) it.next(); |
| buffer.append(entry.getKey()).append("="); |
| buffer.append(entry.getValue()); |
| |
| if (it.hasNext()) { |
| buffer.append(", "); |
| } |
| } |
| buffer.append("]"); |
| } |
| |
| return buffer.toString(); |
| } |
| |
| /** |
| * Returns the ObjectId of the object that caused the OptimisticLockException. |
| * |
| * @since 3.1 |
| */ |
| public ObjectId getFailedObjectId() { |
| return failedObjectId; |
| } |
| } |