OPENJPA-1604: Override default lock level for NamedQueries when using the pessimistic lock manager. Code contributed by Pinaki Poddar and Rick Curtis

git-svn-id: https://svn.apache.org/repos/asf/openjpa/branches/2.0.x@932095 13f79535-47bb-0310-9956-ffa450edef68

openjpa-persistence-locking/src/test/java/org/apache/openjpa/persistence/lockmgr/LockEmployee.java

@@ -25,14 +25,19 @@ import java.io.ObjectOutput;
 
 import javax.persistence.Entity;
 import javax.persistence.Id;
+import javax.persistence.LockModeType;
+import javax.persistence.NamedQueries;
 import javax.persistence.NamedQuery;
 import javax.persistence.Version;
 
-@NamedQuery(
-        name="findEmployeeById"
-        , query="SELECT c FROM LockEmployee c WHERE c.id = :id"
-        )
 
+@NamedQueries( {
+    @NamedQuery(name = "findEmployeeById", 
+        query = "SELECT c FROM LockEmployee c WHERE c.id = :id"),
+    @NamedQuery(name = "findEmployeeByIdWithLock", 
+        query = "SELECT c FROM LockEmployee c WHERE c.id = :id", lockMode = LockModeType.PESSIMISTIC_READ),
+    @NamedQuery(name = "findEmployeeByIdWithNoLock", 
+        query = "SELECT c FROM LockEmployee c WHERE c.id = :id", lockMode = LockModeType.NONE) })
 @Entity
 public class LockEmployee implements Externalizable {
 

openjpa-persistence-locking/src/test/java/org/apache/openjpa/persistence/lockmgr/TestNamedQueryLockMode.java

@@ -0,0 +1,102 @@
+/*
+ * 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.openjpa.persistence.lockmgr;
+
+import javax.persistence.EntityManager;
+import javax.persistence.Query;
+
+import org.apache.openjpa.persistence.TransactionRequiredException;
+import org.apache.openjpa.persistence.test.AllowFailure;
+import org.apache.openjpa.persistence.test.SQLListenerTestCase;
+
+/**
+ * Tests the lock mode on named query emits a FOR UPDATE clause in target SQL
+ * query.
+ * 
+ * 
+ */
+public class TestNamedQueryLockMode extends SQLListenerTestCase {
+    public void setUp() {
+        super.setUp(CLEAR_TABLES, LockEmployee.class, 
+            "openjpa.LockManager", "pessimistic", 
+            "openjpa.Optimistic", "false"
+            );
+    }
+
+    public void testForUpdateClausePresentInNamedQueryWithLockMode() {
+        EntityManager em = emf.createEntityManager();
+        em.getTransaction().begin();
+        assertClausePresentInSQL("FOR UPDATE", em.createNamedQuery("findEmployeeByIdWithLock").setParameter("id", 0));
+        em.getTransaction().rollback();
+        em.getTransaction().begin();
+        assertClausePresentInSQL("FOR UPDATE", em.createNamedQuery("findEmployeeByIdWithLock").setParameter("id", 0));
+        em.getTransaction().rollback();
+        em.getTransaction().begin();
+        assertClausePresentInSQL("FOR UPDATE", em.createNamedQuery("findEmployeeByIdWithLock").setParameter("id", 0));
+        em.getTransaction().rollback();
+    }
+
+    @AllowFailure
+    public void testNamedQueryWithLockModeMustExecuteInTransaction() {
+        EntityManager em = emf.createEntityManager();
+        // execute without a transaction
+         try {
+         em.createNamedQuery("findEmployeeByIdWithLock").setParameter("id",
+         0).getResultList();
+         fail("Expected " + TransactionRequiredException.class.getName());
+         } catch (TransactionRequiredException e) {
+         // Expected
+         }
+    }
+
+    public void testForUpdateClausePresentInQueryWithDefault() {
+        EntityManager em = emf.createEntityManager();
+        em.getTransaction().begin();
+        assertClausePresentInSQL("FOR UPDATE", em.createNamedQuery("findEmployeeById").setParameter("id", 0));
+        assertClausePresentInSQL("FOR UPDATE", em.createNamedQuery("findEmployeeById").setParameter("id", 0));
+        em.getTransaction().commit();
+    }
+
+    @AllowFailure
+    public void testForUpdateClauseAbsentInQueryWithExplictNoLock() {
+        EntityManager em = emf.createEntityManager();
+        em.getTransaction().begin();
+        assertClauseAbsentInSQL("FOR UPDATE", em.createNamedQuery("findEmployeeByIdWithNoLock").setParameter("id", 0));
+        assertClauseAbsentInSQL("FOR UPDATE", em.createNamedQuery("findEmployeeByIdWithNoLock").setParameter("id", 0));
+        em.getTransaction().commit();
+    }
+
+    String getLastSQL() {
+        String last = sql.get(getSQLCount() - 1);
+        assertNotNull("No last sql found", last);
+        return last;
+    }
+
+    void assertClausePresentInSQL(String clause, Query q) {
+        q.getResultList();
+        String last = getLastSQL();
+        assertTrue(clause + " is not present in " + last, last.toUpperCase().indexOf(clause) != -1);
+    }
+
+    void assertClauseAbsentInSQL(String clause, Query q) {
+        q.getResultList();
+        String last = getLastSQL();
+        assertTrue(clause + " is not absent in " + last, last.toUpperCase().indexOf(clause) == -1);
+    }
+}

openjpa-persistence/src/main/java/org/apache/openjpa/persistence/AnnotationPersistenceMetaDataParser.java

@@ -19,7 +19,53 @@
 package org.apache.openjpa.persistence;
 
 import static javax.persistence.GenerationType.AUTO;
-import static org.apache.openjpa.persistence.MetaDataTag.*;
+import static org.apache.openjpa.persistence.MetaDataTag.ACCESS;
+import static org.apache.openjpa.persistence.MetaDataTag.CACHEABLE;
+import static org.apache.openjpa.persistence.MetaDataTag.DATASTORE_ID;
+import static org.apache.openjpa.persistence.MetaDataTag.DATA_CACHE;
+import static org.apache.openjpa.persistence.MetaDataTag.DEPENDENT;
+import static org.apache.openjpa.persistence.MetaDataTag.DETACHED_STATE;
+import static org.apache.openjpa.persistence.MetaDataTag.ELEM_DEPENDENT;
+import static org.apache.openjpa.persistence.MetaDataTag.ELEM_TYPE;
+import static org.apache.openjpa.persistence.MetaDataTag.EMBEDDED_ID;
+import static org.apache.openjpa.persistence.MetaDataTag.ENTITY_LISTENERS;
+import static org.apache.openjpa.persistence.MetaDataTag.EXCLUDE_DEFAULT_LISTENERS;
+import static org.apache.openjpa.persistence.MetaDataTag.EXCLUDE_SUPERCLASS_LISTENERS;
+import static org.apache.openjpa.persistence.MetaDataTag.EXTERNALIZER;
+import static org.apache.openjpa.persistence.MetaDataTag.EXTERNAL_VALS;
+import static org.apache.openjpa.persistence.MetaDataTag.FACTORY;
+import static org.apache.openjpa.persistence.MetaDataTag.FETCH_GROUP;
+import static org.apache.openjpa.persistence.MetaDataTag.FETCH_GROUPS;
+import static org.apache.openjpa.persistence.MetaDataTag.FLUSH_MODE;
+import static org.apache.openjpa.persistence.MetaDataTag.GENERATED_VALUE;
+import static org.apache.openjpa.persistence.MetaDataTag.ID;
+import static org.apache.openjpa.persistence.MetaDataTag.ID_CLASS;
+import static org.apache.openjpa.persistence.MetaDataTag.INVERSE_LOGICAL;
+import static org.apache.openjpa.persistence.MetaDataTag.KEY_DEPENDENT;
+import static org.apache.openjpa.persistence.MetaDataTag.KEY_TYPE;
+import static org.apache.openjpa.persistence.MetaDataTag.LOAD_FETCH_GROUP;
+import static org.apache.openjpa.persistence.MetaDataTag.LRS;
+import static org.apache.openjpa.persistence.MetaDataTag.MANAGED_INTERFACE;
+import static org.apache.openjpa.persistence.MetaDataTag.MAPPED_BY_ID;
+import static org.apache.openjpa.persistence.MetaDataTag.MAP_KEY;
+import static org.apache.openjpa.persistence.MetaDataTag.MAP_KEY_CLASS;
+import static org.apache.openjpa.persistence.MetaDataTag.NATIVE_QUERIES;
+import static org.apache.openjpa.persistence.MetaDataTag.NATIVE_QUERY;
+import static org.apache.openjpa.persistence.MetaDataTag.ORDER_BY;
+import static org.apache.openjpa.persistence.MetaDataTag.POST_LOAD;
+import static org.apache.openjpa.persistence.MetaDataTag.POST_PERSIST;
+import static org.apache.openjpa.persistence.MetaDataTag.POST_REMOVE;
+import static org.apache.openjpa.persistence.MetaDataTag.POST_UPDATE;
+import static org.apache.openjpa.persistence.MetaDataTag.PRE_PERSIST;
+import static org.apache.openjpa.persistence.MetaDataTag.PRE_REMOVE;
+import static org.apache.openjpa.persistence.MetaDataTag.PRE_UPDATE;
+import static org.apache.openjpa.persistence.MetaDataTag.QUERIES;
+import static org.apache.openjpa.persistence.MetaDataTag.QUERY;
+import static org.apache.openjpa.persistence.MetaDataTag.READ_ONLY;
+import static org.apache.openjpa.persistence.MetaDataTag.REPLICATED;
+import static org.apache.openjpa.persistence.MetaDataTag.SEQ_GENERATOR;
+import static org.apache.openjpa.persistence.MetaDataTag.TYPE;
+import static org.apache.openjpa.persistence.MetaDataTag.VERSION;
 
 import java.io.File;
 import java.io.Serializable;
@@ -60,16 +106,16 @@ import javax.persistence.FetchType;
 import javax.persistence.FlushModeType;
 import javax.persistence.GeneratedValue;
 import javax.persistence.GenerationType;
-
 import javax.persistence.Id;
 import javax.persistence.IdClass;
 import javax.persistence.Lob;
+import javax.persistence.LockModeType;
 import javax.persistence.ManyToMany;
 import javax.persistence.ManyToOne;
 import javax.persistence.MapKey;
 import javax.persistence.MapKeyClass;
-import javax.persistence.MapsId;
 import javax.persistence.MappedSuperclass;
+import javax.persistence.MapsId;
 import javax.persistence.NamedNativeQueries;
 import javax.persistence.NamedNativeQuery;
 import javax.persistence.NamedQueries;
@@ -1777,9 +1823,11 @@ public class AnnotationPersistenceMetaDataParser
             meta.setLanguage(JPQLParser.LANG_JPQL);
             for (QueryHint hint : query.hints())
                 meta.addHint(hint.name(), hint.value());
-            if (query.lockMode() != null) {
+            LockModeType lmt = processNamedQueryLockModeType(query);
-                meta.addHint("openjpa.FetchPlan.ReadLockMode", query.lockMode());
+            if (lmt != null) {
+                meta.addHint("openjpa.FetchPlan.ReadLockMode", lmt);
             }
+
             meta.setSource(getSourceFile(), (el instanceof Class) ? el : null,
                 SourceTracker.SRC_ANNOTATIONS);
             if (isMetaDataMode())
@@ -1791,6 +1839,31 @@ public class AnnotationPersistenceMetaDataParser
         }
     }
 
+    /**
+     * A private worker method that calculates the lock mode for an individual NamedQuery. If the NamedQuery is 
+     * configured to use the NONE lock mode(explicit or implicit), this method will promote the lock to a READ
+     * level lock. This was done to allow for JPA1 apps to function properly under a 2.0 runtime. 
+     */
+    private LockModeType processNamedQueryLockModeType(NamedQuery query) {
+        LockModeType lmt = query.lockMode();
+        if (query.lockMode() != null) {
+            String lm = _conf.getLockManager();
+            if (lm != null) {
+                lm = lm.toLowerCase();
+                if (lm.contains("pessimistic")) {
+                    if (lmt == LockModeType.NONE) {
+                        if (_log.isWarnEnabled() == true) {
+                            _log.warn(_loc.get("override-named-query-lock-mode", new String[] { "annotation",
+                                query.name(), _cls.getName() }));
+                        }
+                        lmt = LockModeType.READ;
+                    }
+                }
+            }
+        }
+        return lmt;
+    }
+
     /**
      * Parse @NamedNativeQuery.
      */

openjpa-persistence/src/main/java/org/apache/openjpa/persistence/XMLPersistenceMetaDataParser.java

@@ -35,6 +35,7 @@ import java.util.Stack;
 import javax.persistence.CascadeType;
 import javax.persistence.GenerationType;
 import javax.persistence.LockModeType;
+import javax.persistence.NamedQuery;
 
 import static javax.persistence.CascadeType.*;
 
@@ -1673,8 +1674,9 @@ public class XMLPersistenceMetaDataParser
         meta.setQueryString(attrs.getValue("query"));
         meta.setLanguage(JPQLParser.LANG_JPQL);
         String lockModeStr = attrs.getValue("lock-mode");
-        if (lockModeStr != null) {
+        LockModeType lmt = processNamedQueryLockModeType(log, lockModeStr, name);
-            meta.addHint("openjpa.FetchPlan.ReadLockMode", LockModeType.valueOf(lockModeStr));
+        if (lmt != null) {
+            meta.addHint("openjpa.FetchPlan.ReadLockMode", lmt);
         }
         Locator locator = getLocation().getLocator();
         if (locator != null) {
@@ -1694,6 +1696,33 @@ public class XMLPersistenceMetaDataParser
         pushElement(meta);
         return true;
     }
+    
+    /**
+     * A private worker method that calculates the lock mode for an individual NamedQuery. If the NamedQuery is 
+     * configured to use the NONE lock mode(explicit or implicit), this method will promote the lock to a READ
+     * level lock. This was done to allow for JPA1 apps to function properly under a 2.0 runtime. 
+     */
+    private LockModeType processNamedQueryLockModeType(Log log, String lockModeString, String queryName) {
+        if (lockModeString == null) {
+            return null;
+        }
+        LockModeType lmt = LockModeType.valueOf(lockModeString);
+        String lm = _conf.getLockManager();
+        if (lm != null) {
+            lm = lm.toLowerCase();
+            if (lm.contains("pessimistic")) {
+                if (lmt == LockModeType.NONE) {
+                    if (log != null && log.isWarnEnabled() == true) {
+                        log.warn(_loc.get("override-named-query-lock-mode", new String[] { "xml", queryName,
+                            _cls.getName() }));
+                    }
+                    lmt = LockModeType.READ;
+                }
+            }
+        }
+
+        return lmt;
+    }
 
     protected void endNamedQuery()
         throws SAXException {

openjpa-persistence/src/main/resources/org/apache/openjpa/persistence/localizer.properties

@@ -229,4 +229,6 @@ create-emf-depend-error: Failed to create a provider for "{0}" because a \
 invalid-version-attribute: Persistence version attribute value "{0}" is not valid.  Using version "{1}" by default.
 not-jpql-or-criteria-query: Query is neither a JPQL SELECT nor a Criteria API query.
 cache-retrieve-override: The setting of CacheRetrieveMode.USE is ignored and set to BYPASS for refresh operation.  
-null-detach: Can not detach null entity
+null-detach: Can not detach null entity
+override-named-query-lock-mode: Encountered a read lock level less than LockModeType.READ when processing the \
+NamedQuery {0} "{1}" in class "{2}". Setting query lock level to LockModeType.READ.