Github user ahgittin commented on a diff in the pull request:
https://github.com/apache/incubator-brooklyn/pull/617#discussion_r30496433
--- Diff:
core/src/main/java/brooklyn/catalog/internal/CatalogInitialization.java ---
@@ -0,0 +1,377 @@
+/*
+ * 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.
+ */
+package brooklyn.catalog.internal;
+
+import java.io.File;
+import java.util.Collection;
+import java.util.List;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import brooklyn.catalog.CatalogItem;
+import brooklyn.config.BrooklynServerConfig;
+import brooklyn.management.ManagementContext;
+import brooklyn.management.ManagementContextInjectable;
+import brooklyn.management.internal.ManagementContextInternal;
+import brooklyn.util.ResourceUtils;
+import brooklyn.util.collections.MutableList;
+import brooklyn.util.exceptions.Exceptions;
+import brooklyn.util.exceptions.FatalRuntimeException;
+import brooklyn.util.exceptions.RuntimeInterruptedException;
+import brooklyn.util.flags.TypeCoercions;
+import brooklyn.util.guava.Maybe;
+import brooklyn.util.net.Urls;
+import brooklyn.util.text.Strings;
+
+import com.google.common.annotations.Beta;
+import com.google.common.base.Function;
+import com.google.common.base.Preconditions;
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.Iterables;
+
+@Beta
+public class CatalogInitialization implements ManagementContextInjectable {
--- End diff --
the mutex governs the population of the catalog, to prevent two threads
from running this at the same time. looks to me that this is functioning
correctly. pure defensive programming could lock this down further and make
everything private but i think that would be overkill -- the fields and methods
are already protected or package private and the class marked `@Beta` which is
to say use caution when extending. that's the right level of defensiveness for
something which is evolving IMHO.
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