Moving to root below branch label

git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@2005 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/service/transaction/TransactionService.java

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+/*
+ * Copyright (C) 2005 Alfresco, Inc.
+ *
+ * Licensed under the Mozilla Public License version 1.1 
+ * with a permitted attribution clause. You may obtain a
+ * copy of the License at
+ *
+ *   http://www.alfresco.org/legal/license.txt
+ *
+ * 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.alfresco.service.transaction;
+
+import javax.transaction.UserTransaction;
+
+/**
+ * Contract for retrieving access to a user transaction.
+ * <p>
+ * Note that the implementation of the {@link javax.transaction.UserTransaction}
+ * is not able to provide the full set of status codes available on the
+ * {@link javax.transaction.Status} class.
+ * 
+ * @author David Caruana
+ */
+public interface TransactionService
+{
+    /**
+     * Determine if ALL user transactions will be read-only.
+     * 
+     * @return Returns true if all transactions are read-only.
+     */
+    public boolean isReadOnly();
+    
+    /**
+     * Gets a user transaction that supports transaction propagation.
+     * This is like the EJB <b>REQUIRED</b> transaction attribute.
+     * 
+     * @return the user transaction
+     */
+    UserTransaction getUserTransaction();
+    
+    /**
+     * Gets a user transaction that supports transaction propagation.
+     * This is like the EJB <b>REQUIRED</b> transaction attribute.
+     * 
+     * @param readonly     Set true for a READONLY transaction instance, false otherwise.
+     *      Note that it is not <i>always</i> possible to force a write transaction if the
+     *      system is in read-only mode.
+     * 
+     * @return the user transaction
+     */
+    UserTransaction getUserTransaction(boolean readonly);
+    
+    /**
+     * Gets a user transaction that ensures a new transaction is created.
+     * Any enclosing transaction is not propagated.
+     * This is like the EJB <b>REQUIRES_NEW</b> transaction attribute -
+     * when the transaction is started, the current transaction will be
+     * suspended and a new one started.
+     * 
+     * @return Returns a non-gating user transaction
+     */
+    UserTransaction getNonPropagatingUserTransaction();
+}