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.synccontext.SyncContextFactory;
030
031import static java.util.Objects.requireNonNull;
032
033/**
034 * Default {@link SyncContextFactory} implementation that uses named locks.
035 * <p>
036 * The implementation relies fully on {@link NamedLockFactoryAdapterFactory} and all it does is just "stuff" the
037 * adapter instance into session, hence factory is called only when given session has no instance created.
038 */
039@Singleton
040@Named
041public final class DefaultSyncContextFactory implements SyncContextFactory {
042    private static final String ADAPTER_KEY = DefaultSyncContextFactory.class.getName() + ".adapter";
043
044    private final NamedLockFactoryAdapterFactory namedLockFactoryAdapterFactory;
045
046    /**
047     * Constructor used with DI, where factories are injected and selected based on key.
048     */
049    @Inject
050    public DefaultSyncContextFactory(final NamedLockFactoryAdapterFactory namedLockFactoryAdapterFactory) {
051        this.namedLockFactoryAdapterFactory = requireNonNull(namedLockFactoryAdapterFactory);
052    }
053
054    @Override
055    public SyncContext newInstance(final RepositorySystemSession session, final boolean shared) {
056        requireNonNull(session, "session cannot be null");
057        NamedLockFactoryAdapter adapter = (NamedLockFactoryAdapter) session.getData()
058                .computeIfAbsent(ADAPTER_KEY, () -> namedLockFactoryAdapterFactory.getAdapter(session));
059        return adapter.newInstance(session, shared);
060    }
061}