| /* |
| * 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.logging.log4j.core; |
| |
| import java.util.concurrent.TimeUnit; |
| |
| /** |
| * All proper Java frameworks implement some sort of object life cycle. In Log4j, the main interface for handling |
| * the life cycle context of an object is this one. An object first starts in the {@link State#INITIALIZED} state |
| * by default to indicate the class has been loaded. From here, calling the {@link #start()} method will change this |
| * state to {@link State#STARTING}. After successfully being started, this state is changed to {@link State#STARTED}. |
| * When the {@link #stop()} is called, this goes into the {@link State#STOPPING} state. After successfully being |
| * stopped, this goes into the {@link State#STOPPED} state. In most circumstances, implementation classes should |
| * store their {@link State} in a {@code volatile} field or inside an |
| * {@link java.util.concurrent.atomic.AtomicReference} dependent on synchronization and concurrency requirements. |
| * |
| * @see AbstractLifeCycle |
| */ |
| public interface LifeCycle { |
| |
| /** |
| * Status of a life cycle like a {@link LoggerContext}. |
| */ |
| enum State { |
| /** Object is in its initial state and not yet initialized. */ |
| INITIALIZING, |
| /** Initialized but not yet started. */ |
| INITIALIZED, |
| /** In the process of starting. */ |
| STARTING, |
| /** Has started. */ |
| STARTED, |
| /** Stopping is in progress. */ |
| STOPPING, |
| /** Has stopped. */ |
| STOPPED |
| } |
| |
| /** |
| * Gets the life-cycle state. |
| * |
| * @return the life-cycle state |
| */ |
| State getState(); |
| |
| void initialize(); |
| |
| void start(); |
| |
| void stop(); |
| |
| boolean isStarted(); |
| |
| boolean isStopped(); |
| |
| /** |
| * Blocks until all tasks have completed execution after a shutdown request, or the timeout occurs, or the current |
| * thread is interrupted, whichever happens first. |
| * |
| * @param timeout the maximum time to wait |
| * @param timeUnit the time unit of the timeout argument |
| * @return true if the receiver was stopped cleanly and normally, false otherwise. |
| * @since 2.7 |
| */ |
| boolean stop(long timeout, TimeUnit timeUnit); |
| |
| } |