001package org.eclipse.aether.internal.impl; 002 003/* 004 * Licensed to the Apache Software Foundation (ASF) under one 005 * or more contributor license agreements. See the NOTICE file 006 * distributed with this work for additional information 007 * regarding copyright ownership. The ASF licenses this file 008 * to you under the Apache License, Version 2.0 (the 009 * "License"); you may not use this file except in compliance 010 * with the License. You may obtain a copy of the License at 011 * 012 * http://www.apache.org/licenses/LICENSE-2.0 013 * 014 * Unless required by applicable law or agreed to in writing, 015 * software distributed under the License is distributed on an 016 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 017 * KIND, either express or implied. See the License for the 018 * specific language governing permissions and limitations 019 * under the License. 020 */ 021 022import javax.inject.Inject; 023import javax.inject.Named; 024import javax.inject.Singleton; 025 026import java.util.ArrayList; 027import java.util.concurrent.CopyOnWriteArrayList; 028import java.util.concurrent.atomic.AtomicBoolean; 029 030import org.eclipse.aether.MultiRuntimeException; 031import org.eclipse.aether.impl.RepositorySystemLifecycle; 032 033import static java.util.Objects.requireNonNull; 034 035/** 036 * 037 */ 038@Singleton 039@Named 040public class DefaultRepositorySystemLifecycle 041 implements RepositorySystemLifecycle 042{ 043 private final AtomicBoolean shutdown; 044 045 private final CopyOnWriteArrayList<Runnable> onSystemEndedHandlers; 046 047 @Inject 048 public DefaultRepositorySystemLifecycle() 049 { 050 this.shutdown = new AtomicBoolean( false ); 051 this.onSystemEndedHandlers = new CopyOnWriteArrayList<>(); 052 } 053 054 @Override 055 public void systemEnded() 056 { 057 if ( shutdown.compareAndSet( false, true ) ) 058 { 059 final ArrayList<Exception> exceptions = new ArrayList<>(); 060 for ( Runnable onCloseHandler : onSystemEndedHandlers ) 061 { 062 try 063 { 064 onCloseHandler.run(); 065 } 066 catch ( Exception e ) 067 { 068 exceptions.add( e ); 069 } 070 } 071 MultiRuntimeException.mayThrow( "system on-close handler failures", exceptions ); 072 } 073 } 074 075 @Override 076 public void addOnSystemEndedHandler( Runnable handler ) 077 { 078 requireNonNull( handler, "handler cannot be null" ); 079 requireNotShutdown(); 080 onSystemEndedHandlers.add( 0, handler ); 081 } 082 083 private void requireNotShutdown() 084 { 085 if ( shutdown.get() ) 086 { 087 throw new IllegalStateException( "repository system is already shut down" ); 088 } 089 } 090}