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 javax.inject.Inject;
023import javax.inject.Named;
024import javax.inject.Singleton;
025
026import org.eclipse.aether.RepositorySystemSession;
027import org.eclipse.aether.SyncContext;
028import org.eclipse.aether.internal.impl.synccontext.named.NamedLockFactoryAdapter;
029import org.eclipse.aether.internal.impl.synccontext.named.NamedLockFactoryAdapterFactory;
030import org.eclipse.aether.spi.locator.Service;
031import org.eclipse.aether.spi.locator.ServiceLocator;
032import org.eclipse.aether.spi.synccontext.SyncContextFactory;
033
034import static java.util.Objects.requireNonNull;
035
036/**
037 * Default {@link SyncContextFactory} implementation that uses named locks.
038 * <p>
039 * The implementation relies fully on {@link NamedLockFactoryAdapterFactory} and all it does is just "stuff" the
040 * adapter instance into session, hence factory is called only when given session has no instance created.
041 */
042@Singleton
043@Named
044public final class DefaultSyncContextFactory
045        implements SyncContextFactory, Service
046{
047    private static final String ADAPTER_KEY = DefaultSyncContextFactory.class.getName() + ".adapter";
048
049    private NamedLockFactoryAdapterFactory namedLockFactoryAdapterFactory;
050
051    /**
052     * Constructor used with DI, where factories are injected and selected based on key.
053     */
054    @Inject
055    public DefaultSyncContextFactory( final NamedLockFactoryAdapterFactory namedLockFactoryAdapterFactory )
056    {
057        this.namedLockFactoryAdapterFactory = requireNonNull( namedLockFactoryAdapterFactory );
058    }
059
060    /**
061     * ServiceLocator default ctor.
062     *
063     * @deprecated Will be removed once ServiceLocator removed.
064     */
065    @Deprecated
066    public DefaultSyncContextFactory()
067    {
068        // ctor for ServiceLoader
069    }
070
071    @Override
072    public void initService( final ServiceLocator locator )
073    {
074        this.namedLockFactoryAdapterFactory = requireNonNull(
075                locator.getService( NamedLockFactoryAdapterFactory.class ) );
076    }
077
078    @Override
079    public SyncContext newInstance( final RepositorySystemSession session, final boolean shared )
080    {
081        requireNonNull( session, "session cannot be null" );
082        NamedLockFactoryAdapter adapter = (NamedLockFactoryAdapter) session.getData().computeIfAbsent(
083                ADAPTER_KEY, () -> namedLockFactoryAdapterFactory.getAdapter( session ) );
084        return adapter.newInstance( session, shared );
085    }
086}