| /* |
| * 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.felix.ipojo; |
| |
| /** |
| * This class defines instance state listeners. |
| * An instance state listener is notified of instance state changes. It needs to be |
| * registered on the instance by invoking the ({@link ComponentInstance#addInstanceStateListener(InstanceStateListener)} |
| * method. Once registered, the listener can track instance state changes. |
| * Received states are: |
| * <li>{@link ComponentInstance#VALID}</li> |
| * <li>{@link ComponentInstance#INVALID}</li> |
| * <li>{@link ComponentInstance#STOPPED}</li> |
| * <li>{@link ComponentInstance#DISPOSED}</li> |
| * @author <a href="mailto:dev@felix.apache.org">Felix Project Team</a> |
| */ |
| public interface InstanceStateListener { |
| |
| /** |
| * State change listener callback method. |
| * Every time that a monitored instance's state changes, |
| * this method is called with the instance and the new state. |
| * @param instance the changing instance |
| * @param newState the new instance state |
| */ |
| void stateChanged(ComponentInstance instance, int newState); |
| } |