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.impl.RepositorySystemLifecycle;
029import org.eclipse.aether.internal.impl.synccontext.named.NamedLockFactoryAdapter;
030import org.eclipse.aether.internal.impl.synccontext.named.NamedLockFactorySelector;
031import org.eclipse.aether.internal.impl.synccontext.named.ParameterizedNamedLockFactorySelector;
032import org.eclipse.aether.spi.locator.Service;
033import org.eclipse.aether.spi.locator.ServiceLocator;
034import org.eclipse.aether.spi.synccontext.SyncContextFactory;
035
036import static java.util.Objects.requireNonNull;
037
038/**
039 * Default {@link SyncContextFactory} implementation that uses named locks.
040 */
041@Singleton
042@Named
043public final class DefaultSyncContextFactory
044        implements SyncContextFactory, Service
045{
046    private NamedLockFactoryAdapter namedLockFactoryAdapter;
047
048    /**
049     * Constructor used with DI, where factories are injected and selected based on key.
050     */
051    @Inject
052    public DefaultSyncContextFactory( final RepositorySystemLifecycle repositorySystemLifecycle,
053                                      final NamedLockFactorySelector selector )
054    {
055        repositorySystemLifecycle.addOnSystemEndedHandler( this::shutDownAdapter );
056        this.namedLockFactoryAdapter =
057                new NamedLockFactoryAdapter( selector.getSelectedNameMapper(), selector.getSelectedNamedLockFactory() );
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        locator.getService( RepositorySystemLifecycle.class ).addOnSystemEndedHandler( this::shutDownAdapter );
075        NamedLockFactorySelector selector = new ParameterizedNamedLockFactorySelector();
076        this.namedLockFactoryAdapter =
077                new NamedLockFactoryAdapter( selector.getSelectedNameMapper(), selector.getSelectedNamedLockFactory() );
078    }
079
080    @Override
081    public SyncContext newInstance( final RepositorySystemSession session, final boolean shared )
082    {
083        requireNonNull( session, "session cannot be null" );
084        return namedLockFactoryAdapter.newInstance( session, shared );
085    }
086
087    private void shutDownAdapter()
088    {
089        if ( namedLockFactoryAdapter != null )
090        {
091            namedLockFactoryAdapter.shutdown();
092        }
093    }
094}