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;
030
031import org.eclipse.aether.RepositorySystemSession;
032import org.eclipse.aether.repository.RemoteRepository;
033import org.eclipse.aether.spi.connector.transport.Transporter;
034import org.eclipse.aether.spi.connector.transport.TransporterFactory;
035import org.eclipse.aether.spi.connector.transport.TransporterProvider;
036import org.eclipse.aether.spi.locator.Service;
037import org.eclipse.aether.spi.locator.ServiceLocator;
038import org.eclipse.aether.spi.log.Logger;
039import org.eclipse.aether.spi.log.LoggerFactory;
040import org.eclipse.aether.spi.log.NullLoggerFactory;
041import org.eclipse.aether.transfer.NoTransporterException;
042
043/**
044 */
045@Named
046public final class DefaultTransporterProvider
047    implements TransporterProvider, Service
048{
049
050    private Logger logger = NullLoggerFactory.LOGGER;
051
052    private Collection<TransporterFactory> factories = new ArrayList<TransporterFactory>();
053
054    public DefaultTransporterProvider()
055    {
056        // enables default constructor
057    }
058
059    @Inject
060    DefaultTransporterProvider( Set<TransporterFactory> transporterFactories, LoggerFactory loggerFactory )
061    {
062        setLoggerFactory( loggerFactory );
063        setTransporterFactories( transporterFactories );
064    }
065
066    public void initService( ServiceLocator locator )
067    {
068        setLoggerFactory( locator.getService( LoggerFactory.class ) );
069        setTransporterFactories( locator.getServices( TransporterFactory.class ) );
070    }
071
072    public DefaultTransporterProvider setLoggerFactory( LoggerFactory loggerFactory )
073    {
074        this.logger = NullLoggerFactory.getSafeLogger( loggerFactory, getClass() );
075        return this;
076    }
077
078    public DefaultTransporterProvider addTransporterFactory( TransporterFactory factory )
079    {
080        factories.add( requireNonNull( factory, "transporter factory cannot be null" ) );
081        return this;
082    }
083
084    public DefaultTransporterProvider setTransporterFactories( Collection<TransporterFactory> factories )
085    {
086        if ( factories == null )
087        {
088            this.factories = new ArrayList<TransporterFactory>();
089        }
090        else
091        {
092            this.factories = factories;
093        }
094        return this;
095    }
096
097    public Transporter newTransporter( RepositorySystemSession session, RemoteRepository repository )
098        throws NoTransporterException
099    {
100        requireNonNull( repository, "remote repository cannot be null" );
101
102        PrioritizedComponents<TransporterFactory> factories = new PrioritizedComponents<TransporterFactory>( session );
103        for ( TransporterFactory factory : this.factories )
104        {
105            factories.add( factory, factory.getPriority() );
106        }
107
108        List<NoTransporterException> errors = new ArrayList<NoTransporterException>();
109        for ( PrioritizedComponent<TransporterFactory> factory : factories.getEnabled() )
110        {
111            try
112            {
113                Transporter transporter = factory.getComponent().newInstance( session, repository );
114
115                if ( logger.isDebugEnabled() )
116                {
117                    StringBuilder buffer = new StringBuilder( 256 );
118                    buffer.append( "Using transporter " ).append( transporter.getClass().getSimpleName() );
119                    Utils.appendClassLoader( buffer, transporter );
120                    buffer.append( " with priority " ).append( factory.getPriority() );
121                    buffer.append( " for " ).append( repository.getUrl() );
122                    logger.debug( buffer.toString() );
123                }
124
125                return transporter;
126            }
127            catch ( NoTransporterException e )
128            {
129                // continue and try next factory
130                errors.add( e );
131            }
132        }
133        if ( logger.isDebugEnabled() && errors.size() > 1 )
134        {
135            String msg = "Could not obtain transporter factory for " + repository;
136            for ( Exception e : errors )
137            {
138                logger.debug( msg, e );
139            }
140        }
141
142        StringBuilder buffer = new StringBuilder( 256 );
143        if ( factories.isEmpty() )
144        {
145            buffer.append( "No transporter factories registered" );
146        }
147        else
148        {
149            buffer.append( "Cannot access " ).append( repository.getUrl() );
150            buffer.append( " using the registered transporter factories: " );
151            factories.list( buffer );
152        }
153
154        throw new NoTransporterException( repository, buffer.toString(), errors.size() == 1 ? errors.get( 0 ) : null );
155    }
156
157}