Github user revans2 commented on a diff in the pull request:
https://github.com/apache/storm/pull/1642#discussion_r77527810
--- Diff: storm-core/src/jvm/org/apache/storm/localizer/AsyncLocalizer.java
---
@@ -0,0 +1,420 @@
+/**
+ * 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 org.apache.storm.localizer;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.net.JarURLConnection;
+import java.net.URL;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.Callable;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.Future;
+import java.util.concurrent.TimeUnit;
+
+import org.apache.commons.io.FileUtils;
+import org.apache.storm.Config;
+import org.apache.storm.blobstore.BlobStore;
+import org.apache.storm.blobstore.ClientBlobStore;
+import org.apache.storm.daemon.Shutdownable;
+import org.apache.storm.daemon.supervisor.AdvancedFSOps;
+import org.apache.storm.daemon.supervisor.SupervisorUtils;
+import org.apache.storm.generated.StormTopology;
+import org.apache.storm.utils.ConfigUtils;
+import org.apache.storm.utils.Utils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.google.common.util.concurrent.ThreadFactoryBuilder;
+
+/**
+ * This is a wrapper around the Localizer class that provides the desired
+ * async interface to Slot.
+ * TODO once we have replaced the original supervisor merge this with
+ * Localizer and optimize them
+ */
+public class AsyncLocalizer implements ILocalizer, Shutdownable {
+ /**
+ * A future that has already completed.
+ */
+ private static class AllDoneFuture implements Future<Void> {
+
+ @Override
+ public boolean cancel(boolean mayInterruptIfRunning) {
+ return false;
+ }
+
+ @Override
+ public boolean isCancelled() {
+ return false;
+ }
+
+ @Override
+ public boolean isDone() {
+ return true;
+ }
+
+ @Override
+ public Void get() {
+ return null;
+ }
+
+ @Override
+ public Void get(long timeout, TimeUnit unit) {
--- End diff --
The only `@NotNull` I could find that java could be using is a sun internal
annotation.
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