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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *   http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing,
13   * software distributed under the License is distributed on an
14   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   * KIND, either express or implied.  See the License for the
16   * specific language governing permissions and limitations
17   * under the License.
18   */
19  package org.eclipse.aether.internal.impl.synccontext;
20  
21  import javax.inject.Inject;
22  import javax.inject.Named;
23  import javax.inject.Singleton;
24  
25  import org.eclipse.aether.RepositorySystemSession;
26  import org.eclipse.aether.SyncContext;
27  import org.eclipse.aether.internal.impl.synccontext.named.NamedLockFactoryAdapter;
28  import org.eclipse.aether.internal.impl.synccontext.named.NamedLockFactoryAdapterFactory;
29  import org.eclipse.aether.spi.synccontext.SyncContextFactory;
30  
31  import static java.util.Objects.requireNonNull;
32  
33  /**
34   * Default {@link SyncContextFactory} implementation that uses named locks.
35   * <p>
36   * The implementation relies fully on {@link NamedLockFactoryAdapterFactory} and all it does is just "stuff" the
37   * adapter instance into session, hence factory is called only when given session has no instance created.
38   */
39  @Singleton
40  @Named
41  public final class DefaultSyncContextFactory implements SyncContextFactory {
42      private static final String ADAPTER_KEY = DefaultSyncContextFactory.class.getName() + ".adapter";
43  
44      private final NamedLockFactoryAdapterFactory namedLockFactoryAdapterFactory;
45  
46      /**
47       * Constructor used with DI, where factories are injected and selected based on key.
48       */
49      @Inject
50      public DefaultSyncContextFactory(final NamedLockFactoryAdapterFactory namedLockFactoryAdapterFactory) {
51          this.namedLockFactoryAdapterFactory = requireNonNull(namedLockFactoryAdapterFactory);
52      }
53  
54      @Override
55      public SyncContext newInstance(final RepositorySystemSession session, final boolean shared) {
56          requireNonNull(session, "session cannot be null");
57          NamedLockFactoryAdapter adapter = (NamedLockFactoryAdapter) session.getData()
58                  .computeIfAbsent(ADAPTER_KEY, () -> namedLockFactoryAdapterFactory.getAdapter(session));
59          return adapter.newInstance(session, shared);
60      }
61  }