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.synccontext;
020
021import javax.inject.Inject;
022import javax.inject.Named;
023import javax.inject.Singleton;
024
025import org.eclipse.aether.RepositorySystemSession;
026import org.eclipse.aether.SyncContext;
027import org.eclipse.aether.internal.impl.synccontext.named.NamedLockFactoryAdapter;
028import org.eclipse.aether.internal.impl.synccontext.named.NamedLockFactoryAdapterFactory;
029import org.eclipse.aether.spi.locator.Service;
030import org.eclipse.aether.spi.locator.ServiceLocator;
031import org.eclipse.aether.spi.synccontext.SyncContextFactory;
032
033import static java.util.Objects.requireNonNull;
034
035/**
036 * Default {@link SyncContextFactory} implementation that uses named locks.
037 * <p>
038 * The implementation relies fully on {@link NamedLockFactoryAdapterFactory} and all it does is just "stuff" the
039 * adapter instance into session, hence factory is called only when given session has no instance created.
040 */
041@Singleton
042@Named
043public final class DefaultSyncContextFactory implements SyncContextFactory, Service {
044    private static final String ADAPTER_KEY = DefaultSyncContextFactory.class.getName() + ".adapter";
045
046    private NamedLockFactoryAdapterFactory namedLockFactoryAdapterFactory;
047
048    /**
049     * Constructor used with DI, where factories are injected and selected based on key.
050     */
051    @Inject
052    public DefaultSyncContextFactory(final NamedLockFactoryAdapterFactory namedLockFactoryAdapterFactory) {
053        this.namedLockFactoryAdapterFactory = requireNonNull(namedLockFactoryAdapterFactory);
054    }
055
056    /**
057     * ServiceLocator default ctor.
058     *
059     * @deprecated Will be removed once ServiceLocator removed.
060     */
061    @Deprecated
062    public DefaultSyncContextFactory() {
063        // ctor for ServiceLoader
064    }
065
066    @Override
067    public void initService(final ServiceLocator locator) {
068        this.namedLockFactoryAdapterFactory = requireNonNull(locator.getService(NamedLockFactoryAdapterFactory.class));
069    }
070
071    @Override
072    public SyncContext newInstance(final RepositorySystemSession session, final boolean shared) {
073        requireNonNull(session, "session cannot be null");
074        NamedLockFactoryAdapter adapter = (NamedLockFactoryAdapter) session.getData()
075                .computeIfAbsent(ADAPTER_KEY, () -> namedLockFactoryAdapterFactory.getAdapter(session));
076        return adapter.newInstance(session, shared);
077    }
078}