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 java.util.ArrayList;
023import java.util.Collection;
024import java.util.List;
025import static java.util.Objects.requireNonNull;
026import java.util.Set;
027
028import javax.inject.Inject;
029import javax.inject.Named;
030import javax.inject.Singleton;
031
032import org.eclipse.aether.RepositorySystemSession;
033import org.eclipse.aether.repository.RemoteRepository;
034import org.eclipse.aether.spi.connector.transport.Transporter;
035import org.eclipse.aether.spi.connector.transport.TransporterFactory;
036import org.eclipse.aether.spi.connector.transport.TransporterProvider;
037import org.eclipse.aether.spi.locator.Service;
038import org.eclipse.aether.spi.locator.ServiceLocator;
039import org.eclipse.aether.transfer.NoTransporterException;
040import org.slf4j.Logger;
041import org.slf4j.LoggerFactory;
042
043/**
044 */
045@Singleton
046@Named
047public final class DefaultTransporterProvider
048    implements TransporterProvider, Service
049{
050
051    private static final Logger LOGGER = LoggerFactory.getLogger( DefaultTransporterProvider.class );
052
053    private Collection<TransporterFactory> factories = new ArrayList<>();
054
055    public DefaultTransporterProvider()
056    {
057        // enables default constructor
058    }
059
060    @Inject
061    DefaultTransporterProvider( Set<TransporterFactory> transporterFactories )
062    {
063        setTransporterFactories( transporterFactories );
064    }
065
066    public void initService( ServiceLocator locator )
067    {
068        setTransporterFactories( locator.getServices( TransporterFactory.class ) );
069    }
070
071    public DefaultTransporterProvider addTransporterFactory( TransporterFactory factory )
072    {
073        factories.add( requireNonNull( factory, "transporter factory cannot be null" ) );
074        return this;
075    }
076
077    public DefaultTransporterProvider setTransporterFactories( Collection<TransporterFactory> factories )
078    {
079        if ( factories == null )
080        {
081            this.factories = new ArrayList<>();
082        }
083        else
084        {
085            this.factories = factories;
086        }
087        return this;
088    }
089
090    public Transporter newTransporter( RepositorySystemSession session, RemoteRepository repository )
091        throws NoTransporterException
092    {
093        requireNonNull( "session", "session cannot be null" );
094        requireNonNull( "repository", "repository cannot be null" );
095
096        PrioritizedComponents<TransporterFactory> factories = new PrioritizedComponents<>( session );
097        for ( TransporterFactory factory : this.factories )
098        {
099            factories.add( factory, factory.getPriority() );
100        }
101
102        List<NoTransporterException> errors = new ArrayList<>();
103        for ( PrioritizedComponent<TransporterFactory> factory : factories.getEnabled() )
104        {
105            try
106            {
107                Transporter transporter = factory.getComponent().newInstance( session, repository );
108
109                if ( LOGGER.isDebugEnabled() )
110                {
111                    StringBuilder buffer = new StringBuilder( 256 );
112                    buffer.append( "Using transporter " ).append( transporter.getClass().getSimpleName() );
113                    Utils.appendClassLoader( buffer, transporter );
114                    buffer.append( " with priority " ).append( factory.getPriority() );
115                    buffer.append( " for " ).append( repository.getUrl() );
116                    LOGGER.debug( buffer.toString() );
117                }
118
119                return transporter;
120            }
121            catch ( NoTransporterException e )
122            {
123                // continue and try next factory
124                errors.add( e );
125            }
126        }
127        if ( LOGGER.isDebugEnabled() && errors.size() > 1 )
128        {
129            for ( Exception e : errors )
130            {
131                LOGGER.debug( "Could not obtain transporter factory for {}", repository, e );
132            }
133        }
134
135        StringBuilder buffer = new StringBuilder( 256 );
136        if ( factories.isEmpty() )
137        {
138            buffer.append( "No transporter factories registered" );
139        }
140        else
141        {
142            buffer.append( "Cannot access " ).append( repository.getUrl() );
143            buffer.append( " using the registered transporter factories: " );
144            factories.list( buffer );
145        }
146
147        throw new NoTransporterException( repository, buffer.toString(), errors.size() == 1 ? errors.get( 0 ) : null );
148    }
149
150}