001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *   http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing,
013 * software distributed under the License is distributed on an
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 * KIND, either express or implied.  See the License for the
016 * specific language governing permissions and limitations
017 * under the License.
018 */
019package org.eclipse.aether.internal.impl;
020
021import javax.inject.Inject;
022import javax.inject.Named;
023import javax.inject.Singleton;
024
025import java.util.ArrayList;
026import java.util.Collections;
027import java.util.List;
028import java.util.Map;
029
030import org.eclipse.aether.RepositorySystemSession;
031import org.eclipse.aether.impl.RemoteRepositoryFilterManager;
032import org.eclipse.aether.impl.RepositoryConnectorProvider;
033import org.eclipse.aether.internal.impl.filter.FilteringRepositoryConnector;
034import org.eclipse.aether.repository.RemoteRepository;
035import org.eclipse.aether.spi.connector.RepositoryConnector;
036import org.eclipse.aether.spi.connector.RepositoryConnectorFactory;
037import org.eclipse.aether.spi.connector.filter.RemoteRepositoryFilter;
038import org.eclipse.aether.transfer.NoRepositoryConnectorException;
039import org.slf4j.Logger;
040import org.slf4j.LoggerFactory;
041
042import static java.util.Objects.requireNonNull;
043
044/**
045 */
046@Singleton
047@Named
048public class DefaultRepositoryConnectorProvider implements RepositoryConnectorProvider {
049
050    private static final Logger LOGGER = LoggerFactory.getLogger(DefaultRepositoryConnectorProvider.class);
051
052    private final Map<String, RepositoryConnectorFactory> connectorFactories;
053
054    private final RemoteRepositoryFilterManager remoteRepositoryFilterManager;
055
056    @Inject
057    public DefaultRepositoryConnectorProvider(
058            Map<String, RepositoryConnectorFactory> connectorFactories,
059            RemoteRepositoryFilterManager remoteRepositoryFilterManager) {
060        this.connectorFactories = Collections.unmodifiableMap(connectorFactories);
061        this.remoteRepositoryFilterManager = requireNonNull(remoteRepositoryFilterManager);
062    }
063
064    @Override
065    public RepositoryConnector newRepositoryConnector(RepositorySystemSession session, RemoteRepository repository)
066            throws NoRepositoryConnectorException {
067        requireNonNull(repository, "remote repository cannot be null");
068
069        if (repository.isBlocked()) {
070            if (repository.getMirroredRepositories().isEmpty()) {
071                throw new NoRepositoryConnectorException(repository, "Blocked repository: " + repository);
072            } else {
073                throw new NoRepositoryConnectorException(
074                        repository, "Blocked mirror for repositories: " + repository.getMirroredRepositories());
075            }
076        }
077
078        PrioritizedComponents<RepositoryConnectorFactory> factories = PrioritizedComponents.reuseOrCreate(
079                session, RepositoryConnectorFactory.class, connectorFactories, RepositoryConnectorFactory::getPriority);
080
081        RemoteRepositoryFilter filter = remoteRepositoryFilterManager.getRemoteRepositoryFilter(session);
082        List<NoRepositoryConnectorException> errors = new ArrayList<>();
083        for (PrioritizedComponent<RepositoryConnectorFactory> factory : factories.getEnabled()) {
084            try {
085                RepositoryConnector connector = factory.getComponent().newInstance(session, repository);
086
087                if (LOGGER.isDebugEnabled()) {
088                    StringBuilder buffer = new StringBuilder(256);
089                    buffer.append("Using connector ")
090                            .append(connector.getClass().getSimpleName());
091                    Utils.appendClassLoader(buffer, connector);
092                    buffer.append(" with priority ").append(factory.getPriority());
093                    buffer.append(" for ").append(repository.getUrl());
094                    LOGGER.debug(buffer.toString());
095                }
096
097                if (filter != null) {
098                    return new FilteringRepositoryConnector(repository, connector, filter);
099                } else {
100                    return connector;
101                }
102            } catch (NoRepositoryConnectorException e) {
103                // continue and try next factory
104                LOGGER.debug("Could not obtain connector factory for {}", repository, e);
105                errors.add(e);
106            }
107        }
108
109        StringBuilder buffer = new StringBuilder(256);
110        if (factories.isEmpty()) {
111            buffer.append("No connector factories available");
112        } else {
113            buffer.append("Cannot access ").append(repository.getUrl());
114            buffer.append(" with type ").append(repository.getContentType());
115            buffer.append(" using the available connector factories: ");
116            factories.list(buffer);
117        }
118
119        // create exception: if one error, make it cause
120        NoRepositoryConnectorException ex = new NoRepositoryConnectorException(
121                repository, buffer.toString(), errors.size() == 1 ? errors.get(0) : null);
122        // if more errors, make them all suppressed
123        if (errors.size() > 1) {
124            errors.forEach(ex::addSuppressed);
125        }
126        throw ex;
127    }
128}