(no commit message)

[utils] / wicket / components / src / main / java / org / wamblee / wicket / page / FlushEntityManagerBehavior.java

diff --git a/wicket/components/src/main/java/org/wamblee/wicket/page/FlushEntityManagerBehavior.java b/wicket/components/src/main/java/org/wamblee/wicket/page/FlushEntityManagerBehavior.java
new file mode 100644 (file)
index 0000000..d1b663d
--- /dev/null
+++ b/wicket/components/src/main/java/org/wamblee/wicket/page/FlushEntityManagerBehavior.java
@@ -0,0 +1,69 @@
+/*
+ * Copyright 2005-2010 the original author or authors.
+ * 
+ * Licensed 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.wamblee.wicket.page;
+
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+import javax.annotation.Resource;
+import javax.persistence.EntityManager;
+import javax.persistence.PersistenceException;
+import javax.persistence.TransactionRequiredException;
+import javax.transaction.Status;
+import javax.transaction.SystemException;
+import javax.transaction.UserTransaction;
+
+import org.apache.wicket.markup.html.WebPage;
+
+/**
+ * Behavior to flush the entity manager after rendering of the page.
+ * 
+ * @author Erik Brakkee
+ * 
+ */
+public class FlushEntityManagerBehavior extends AbstractPageBehavior {
+
+    private static final Logger LOGGER = Logger
+        .getLogger(FlushEntityManagerBehavior.class.getName());
+
+    private EntityManager entityManager;
+
+    /**
+     * Constructs the behavior.
+     * 
+     * @param aEntityManager
+     *            Contextual reference to an entitymanager.
+     */
+    public FlushEntityManagerBehavior(EntityManager aEntityManager) {
+        entityManager = aEntityManager;
+    }
+
+    @Override
+    public void onAfterRender(WebPage aPage) {
+        try {
+            if (entityManager.isOpen()) {
+                entityManager.flush();
+            }
+        } catch (TransactionRequiredException e) {
+            throw e;
+        } catch (PersistenceException e) {
+            throw e;
+        } catch (Exception e) {
+            LOGGER.log(Level.WARNING, "Could not flush entitymanager", e);
+        }
+    }
+
+}