[GitHub] [incubator-druid] leventov commented on a change in pull request #8848: Refactor DirectDruidClient, extract BufferInputStreamResponseHandler

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leventov commented on a change in pull request #8848: Refactor DirectDruidClient, extract BufferInputStreamResponseHandler
URL: https://github.com/apache/incubator-druid/pull/8848#discussion_r347087612
 
 

 ##########
 File path: server/src/main/java/org/apache/druid/client/BufferInputStreamResponseHandler.java
 ##########
 @@ -0,0 +1,347 @@
+/*
+ * 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.druid.client;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.google.common.base.Preconditions;
+import org.apache.druid.java.util.common.RE;
+import org.apache.druid.java.util.common.StringUtils;
+import org.apache.druid.java.util.common.logger.Logger;
+import org.apache.druid.java.util.emitter.service.ServiceEmitter;
+import org.apache.druid.java.util.http.client.response.ClientResponse;
+import org.apache.druid.java.util.http.client.response.HttpResponseHandler;
+import org.apache.druid.query.Query;
+import org.apache.druid.query.QueryContexts;
+import org.apache.druid.query.QueryMetrics;
+import org.apache.druid.query.QueryToolChestWarehouse;
+import org.apache.druid.query.context.ResponseContext;
+import org.apache.druid.server.QueryResource;
+import org.jboss.netty.buffer.ChannelBuffer;
+import org.jboss.netty.buffer.ChannelBuffers;
+import org.jboss.netty.handler.codec.http.HttpChunk;
+import org.jboss.netty.handler.codec.http.HttpResponse;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.SequenceInputStream;
+import java.util.Enumeration;
+import java.util.concurrent.BlockingQueue;
+import java.util.concurrent.LinkedBlockingQueue;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicBoolean;
+import java.util.concurrent.atomic.AtomicLong;
+import java.util.concurrent.atomic.AtomicReference;
+
+public class BufferInputStreamResponseHandler implements HttpResponseHandler<InputStream, InputStream>
 
 Review comment:
   Please add a class-level Javadoc explaining something about this class. Also, its name suggests that it could possibly be emulated by combining existing pieces (like BufferedInputStream + some other HttpResponseHandler). If that is not possible, or the semantics are actually different, it should be highlighted in the comment.
   
   Optional: [explain the concurrency](https://github.com/code-review-checklists/java-concurrency#justify-document) (the class has a lot of it: Atomic fields, BlockingQueue, etc.) and add [concurrent access documentation](https://github.com/code-review-checklists/java-concurrency#justify-document) to the methods of this class.

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