src/javax/persistence/PersistenceContext.java

/*******************************************************************************
 * Copyright (c) 2008 - 2015 Oracle Corporation. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0
 * which accompanies this distribution.
 * The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
 * and the Eclipse Distribution License is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * Contributors:
 *     Petros Splinakis - Java Persistence 2.2
 *     Linda DeMichiel - Java Persistence 2.1
 *     Linda DeMichiel - Java Persistence 2.0
 *
 ******************************************************************************/ 
package javax.persistence;

import java.lang.annotation.Repeatable;
import java.lang.annotation.Target;
import static java.lang.annotation.ElementType.*;
import java.lang.annotation.Retention;
import static java.lang.annotation.RetentionPolicy.*;

/**
 * Expresses a dependency on a container-managed {@link EntityManager} and its
 * associated persistence context.
 *
 * @since Java Persistence 1.0
 */

@Repeatable(PersistenceContexts.class)
@Target({TYPE, METHOD, FIELD})
@Retention(RUNTIME)
public @interface PersistenceContext {

    /**
     * (Optional) The name by which the entity manager is to be accessed in the 
     * environment referencing context; not needed when dependency 
     * injection is used.
     */
    String name() default "";

    /**
     * (Optional) The name of the persistence unit as defined in the
     * <code>persistence.xml</code> file. If the <code>unitName</code> element is
     * specified, the persistence unit for the entity manager that is
     * accessible in JNDI must have the same name.
     */
    String unitName() default "";

    /**
     * (Optional) Specifies whether a transaction-scoped persistence context 
     * or an extended persistence context is to be used.
     */
    PersistenceContextType type() default PersistenceContextType.TRANSACTION;

    /**
     * (Optional) Specifies whether the persistence context is always
     * automatically synchronized with the current transaction or whether
     * the persistence context must be explicitly joined to the current
     * transaction by means of the EntityManager 
     * {@link EntityManager#joinTransaction <code>joinTransaction</code>} method.
     * @since Java Persistence 2.1
     */
    SynchronizationType synchronization() default SynchronizationType.SYNCHRONIZED;

    /**
     * (Optional) Properties for the container or persistence
     * provider.  Vendor specific properties may be included in this
     * set of properties.  Properties that are not recognized by
     * a vendor are ignored.  
     */ 
    PersistenceProperty[] properties() default {};
}