201405.mbox/raw/%3c20140512064219.6F0382388C5A@eris.apache.org%3e

+    package org.apache.onami.persist;
+
+    /*
+     * 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.
+     */
+
+    import com.google.inject.Inject;
+    import com.google.inject.Singleton;
+
+    import javax.persistence.EntityManagerFactory;
+
+    import static org.apache.onami.persist.Preconditions.checkNotNull;
+
+    /**
+     * Source for {@link javax.persistence.EntityManagerFactory}.
+     * The sourced instance is looked up via a JNDI call.
+     */
+    @Singleton
+    class EntityManagerFactorySourceByJndiLookup
+        implements EntityManagerFactorySource
+    {
+
+        /**
+         * The JNDI name of the persistence unit.
+         */
+        private final String jndiName;
+
+        /**
+         * Helper for JNDI lookup.
+         */
+        private final JndiLookupHelper jndiLookupHelper;
+
+        /**
+         * Constructor.
+         *
+         * @param jndiName         jndi name of the entity manager factory. Must not be {@code null}.
+         * @param jndiLookupHelper the lookup helper. Must not be {@code null}.
+         */
+        @Inject
+        EntityManagerFactorySourceByJndiLookup( @ForContainerManaged String jndiName, JndiLookupHelper jndiLookupHelper )
+        {
+            this.jndiName = checkNotNull( jndiName, "jndiName is mandatory!" );
+            this.jndiLookupHelper = checkNotNull( jndiLookupHelper, "jndiLookupHelper is mandatory!" );
+        }
+
+        /**
+         * Gets a {@link javax.persistence.EntityManagerFactory} by looking it up in the JNDI context.
+         *
+         * @return the found entity manager factory
+         * @throws RuntimeException when no entity manager factory was found.
+         */
+        //@Override
+        public EntityManagerFactory getEntityManagerFactory()
+        {
+            return jndiLookupHelper.doJndiLookup( EntityManagerFactory.class, jndiName );
+        }
+
+    }
+