OPENJPA-1372: Add testcases - no mainline code changes.

Submitted By: Pinaki Poddar and Milosz Tylenda

git-svn-id: https://svn.apache.org/repos/asf/openjpa/branches/2.0.x@993549 13f79535-47bb-0310-9956-ffa450edef68

openjpa-persistence-jdbc/src/test/java/org/apache/openjpa/persistence/sequence/GeneratedIdObject.java

@@ -0,0 +1,41 @@
+/*
+ * 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.sequence;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.Id;
+
+/**
+ * An entity that uses generated value for its primary key.
+ * Used to demonstrate OPENJPA_SEQUENCE_TABLE failure under multi-threaded environment.
+ * 
+ * @author Pinaki Poddar
+ *
+ */
+@Entity
+public class GeneratedIdObject {
+    @Id
+    @GeneratedValue
+    private long id;
+    
+    public long getId() {
+        return id;
+    }
+}

openjpa-persistence-jdbc/src/test/java/org/apache/openjpa/persistence/sequence/TestSequenceGenerationOnMT.java

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+/*
+ * 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.sequence;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.concurrent.Callable;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.Future;
+
+import javax.persistence.EntityManager;
+
+import org.apache.openjpa.persistence.test.SingleEMFTestCase;
+
+
+public class TestSequenceGenerationOnMT extends SingleEMFTestCase {
+    public void setUp() {
+        super.setUp(CLEAR_TABLES, GeneratedIdObject.class, 
+          "openjpa.Multithreaded", "true");
+    }
+    
+    public void testIdGenerationInMultithreadedEnvironment() {
+        int nThreads = 5;
+        ExecutorService threads = Executors.newFixedThreadPool(nThreads);
+        List<Callable<Boolean>> tasks = new ArrayList<Callable<Boolean>>();
+        for (int i = 0; i < nThreads; i++) {
+            Loader loader = new Loader(emf.createEntityManager());
+            tasks.add(loader);
+        }
+        List<Future<Boolean>> results;
+        try {
+            results = threads.invokeAll(tasks);
+            for (Future<Boolean> result : results) {
+                assertTrue(result.get());
+            }
+        } catch (ExecutionException ee) {
+            ee.getCause().printStackTrace();
+            fail("Failed " + ee.getCause());
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+            fail("Failed " + e);
+        }
+        
+    }
+    
+    
+    public static class Loader implements Callable<Boolean> {
+        EntityManager em;
+        Loader(EntityManager em) {
+            this.em = em;
+        }
+        public Boolean call() throws Exception {
+            GeneratedIdObject pc = new GeneratedIdObject();
+            em.getTransaction().begin();
+            em.persist(pc);
+            em.getTransaction().commit();
+            return true;
+        }
+    }
+}