001package org.eclipse.aether.internal.impl.synccontext; 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 java.util.HashMap; 023import java.util.Map; 024import java.util.concurrent.TimeUnit; 025 026import javax.inject.Inject; 027import javax.inject.Named; 028import javax.inject.Singleton; 029 030import org.eclipse.aether.internal.impl.synccontext.named.DiscriminatingNameMapper; 031import org.eclipse.aether.internal.impl.synccontext.named.GAVNameMapper; 032import org.eclipse.aether.internal.impl.synccontext.named.NameMapper; 033import org.eclipse.aether.internal.impl.synccontext.named.StaticNameMapper; 034import org.eclipse.aether.named.NamedLockFactory; 035import org.eclipse.aether.named.providers.LocalReadWriteLockNamedLockFactory; 036import org.eclipse.aether.named.providers.LocalSemaphoreNamedLockFactory; 037import org.eclipse.aether.named.providers.NoopNamedLockFactory; 038 039/** 040 * Selector for {@link NamedLockFactory} and {@link NameMapper} that selects and exposes selected ones. Essentially 041 * all the named locks configuration is here. 042 */ 043@Singleton 044@Named 045public final class NamedLockFactorySelector 046{ 047 public static final long TIME = Long.getLong( 048 "aether.syncContext.named.time", 30L 049 ); 050 051 public static final TimeUnit TIME_UNIT = TimeUnit.valueOf( System.getProperty( 052 "aether.syncContext.named.time.unit", TimeUnit.SECONDS.name() 053 ) ); 054 055 private static final String FACTORY_NAME = System.getProperty( 056 "aether.syncContext.named.factory", LocalReadWriteLockNamedLockFactory.NAME 057 ); 058 059 private static final String NAME_MAPPER_NAME = System.getProperty( 060 "aether.syncContext.named.nameMapper", GAVNameMapper.NAME 061 ); 062 063 private final NamedLockFactory namedLockFactory; 064 065 private final NameMapper nameMapper; 066 067 /** 068 * Constructor used with DI, where factories are injected and selected based on key. 069 */ 070 @Inject 071 public NamedLockFactorySelector( final Map<String, NamedLockFactory> factories, 072 final Map<String, NameMapper> nameMappers ) 073 { 074 this.namedLockFactory = selectNamedLockFactory( factories ); 075 this.nameMapper = selectNameMapper( nameMappers ); 076 } 077 078 /** 079 * Default constructor for ServiceLocator. 080 */ 081 public NamedLockFactorySelector() 082 { 083 Map<String, NamedLockFactory> factories = new HashMap<>(); 084 factories.put( NoopNamedLockFactory.NAME, new NoopNamedLockFactory() ); 085 factories.put( LocalReadWriteLockNamedLockFactory.NAME, new LocalReadWriteLockNamedLockFactory() ); 086 factories.put( LocalSemaphoreNamedLockFactory.NAME, new LocalSemaphoreNamedLockFactory() ); 087 this.namedLockFactory = selectNamedLockFactory( factories ); 088 089 Map<String, NameMapper> nameMappers = new HashMap<>(); 090 nameMappers.put( StaticNameMapper.NAME, new StaticNameMapper() ); 091 nameMappers.put( GAVNameMapper.NAME, new GAVNameMapper() ); 092 nameMappers.put( DiscriminatingNameMapper.NAME, new DiscriminatingNameMapper( new GAVNameMapper() ) ); 093 this.nameMapper = selectNameMapper( nameMappers ); 094 } 095 096 /** 097 * Returns the selected {@link NamedLockFactory}, never null. 098 */ 099 public NamedLockFactory getSelectedNamedLockFactory() 100 { 101 return namedLockFactory; 102 } 103 104 /** 105 * Returns the selected {@link NameMapper}, never null. 106 */ 107 public NameMapper getSelectedNameMapper() 108 { 109 return nameMapper; 110 } 111 112 private static NamedLockFactory selectNamedLockFactory( final Map<String, NamedLockFactory> factories ) 113 { 114 NamedLockFactory factory = factories.get( FACTORY_NAME ); 115 if ( factory == null ) 116 { 117 throw new IllegalArgumentException( "Unknown NamedLockFactory name: " + FACTORY_NAME 118 + ", known ones: " + factories.keySet() ); 119 } 120 return factory; 121 } 122 123 private static NameMapper selectNameMapper( final Map<String, NameMapper> nameMappers ) 124 { 125 NameMapper nameMapper = nameMappers.get( NAME_MAPPER_NAME ); 126 if ( nameMapper == null ) 127 { 128 throw new IllegalArgumentException( "Unknown NameMapper name: " + NAME_MAPPER_NAME 129 + ", known ones: " + nameMappers.keySet() ); 130 } 131 return nameMapper; 132 } 133}