[GitHub] [maven-resolver] michael-o commented on a change in pull request #77: [MRESOLVER-145] SyncContext implementations

[GitBox <gi...@apache.org>]

michael-o commented on a change in pull request #77:
URL: https://github.com/apache/maven-resolver/pull/77#discussion_r605551000



##########
File path: maven-resolver-impl/src/main/java/org/eclipse/aether/internal/impl/synccontext/DefaultSyncContextFactory.java
##########
@@ -0,0 +1,86 @@
+package org.eclipse.aether.internal.impl.synccontext;
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import org.eclipse.aether.RepositorySystemSession;
+import org.eclipse.aether.SyncContext;
+import org.eclipse.aether.spi.synccontext.SyncContextFactory;
+
+import javax.inject.Inject;
+import javax.inject.Named;
+import javax.inject.Singleton;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Objects;
+
+/**
+ * Default {@link SyncContextFactory} implementation that delegates to some {@link SyncContextFactoryDelegate}
+ * implementation.
+ */
+@Singleton
+@Named
+public final class DefaultSyncContextFactory
+        implements SyncContextFactory, org.eclipse.aether.impl.SyncContextFactory
+{
+    private static final String SYNC_CONTEXT_FACTORY_NAME = System.getProperty(
+            "aether.syncContext.impl", NamedSyncContextFactory.NAME
+    );
+
+    private final SyncContextFactoryDelegate delegate;
+
+    /**
+     * Constructor used with DI, where factories are injected and selected based on key.
+     */
+    @Inject
+    public DefaultSyncContextFactory( final Map<String, SyncContextFactoryDelegate> delegates )
+    {
+        Objects.requireNonNull( delegates );
+        this.delegate = selectDelegate( delegates );
+    }
+
+    /**
+     * Default constructor.
+     */
+    public DefaultSyncContextFactory()
+    {
+        HashMap<String, SyncContextFactoryDelegate> delegates = new HashMap<>( 3 );
+        delegates.put( NoLockSyncContextFactory.NAME, new NoLockSyncContextFactory() );
+        delegates.put( GlobalSyncContextFactory.NAME, new GlobalSyncContextFactory() );
+        delegates.put( NamedSyncContextFactory.NAME, new NamedSyncContextFactory() );
+        this.delegate = selectDelegate( delegates );
+    }

Review comment:
       OK, makes sense!




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