2 * Copyright (c) 2013, 2017 Cisco Systems, Inc. and others. All rights reserved.
4 * This program and the accompanying materials are made available under the
5 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
6 * and is available at http://www.eclipse.org/legal/epl-v10.html
8 package org.opendaylight.controller.config.spi;
10 import javax.annotation.concurrent.NotThreadSafe;
11 import org.opendaylight.controller.config.api.ModuleIdentifier;
12 import org.opendaylight.yangtools.concepts.Identifiable;
15 * Represents one service that is to be configured. These methods need to be
16 * implemented in addition to the usual attribute getters/setters. Dependencies
17 * should always be injected as ObjectName references to the corresponding
20 * In order to guide dependency resolution, the setter method should be
22 * {@link org.opendaylight.controller.config.api.annotations.RequireInterface}.
25 * Thread safety note: implementations of this interface are not required to be
26 * thread safe as thread safety is enforced by configuration manager.
30 public interface Module extends Identifiable<ModuleIdentifier> {
32 * This method will be called as first phase in two phase commit. Instance can
33 * check attributes, but is not allowed to do any kind of work that could leave
34 * any resources open. It is prohibited to call {@link #getInstance()} on
35 * dependent {@link Module} because it would destroy separation between
36 * validation and commit phase.
42 * Returns 'live' object that was configured using this object. It is allowed to
43 * call this method only after all ConfigBeans were validated. In this method
44 * new resources might be opened or old instance might be modified. This method
45 * must be implemented so that it returns same result for a single transaction.
46 * Since Module is created per transaction this means that it must be safe to
47 * cache result of first call.
50 * @return closeable instance: After bundle update the factory might be able to
51 * copy old configuration into new one without being able to cast Module
52 * or the instance. Thus to clean up old instance, it will call close().
54 AutoCloseable getInstance();
57 * Compare current module with oldModule and if the instance/live object
58 * produced by the old module can be reused in this module as well return true.
59 * Typically true should be returned if the old module had the same
64 * old instance of Module
65 * @return true if the instance produced by oldModule can be reused with current
68 boolean canReuse(Module oldModule);