Github user dimas-b commented on a diff in the pull request: https://github.com/apache/tinkerpop/pull/899#discussion_r206549700 --- Diff: gremlin-server/src/main/java/org/apache/tinkerpop/gremlin/server/ResponseHandlerContext.java --- @@ -0,0 +1,85 @@ +/* + * 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.tinkerpop.gremlin.server; + +import org.apache.tinkerpop.gremlin.driver.message.ResponseMessage; +import org.apache.tinkerpop.gremlin.driver.message.ResponseStatusCode; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import java.util.concurrent.atomic.AtomicBoolean; + +/** + * A context for asynchronously writing response messages related to a particular request. + * <p>The "write" methods of this class ensure that at most one {@link ResponseStatusCode#isFinalResponse() final} + * response message is written to the underlying channel. Attempts to write more than one final response message will + * be ignored with a warning log message.</p> + * <p>Note: an object of this class should be used instead of writing to the channel directly when multiple threads + * are expected to produce final response messages concurrently. Callers must ensure that the same + * {@link ResponseHandlerContext} is used by all threads writing response messages for the same request.</p> + * + * @author Dmitri Bourlatchkov + */ +public class ResponseHandlerContext { + private static final Logger logger = LoggerFactory.getLogger(ResponseHandlerContext.class); + + private final Context context; + private final AtomicBoolean finalResponseWritten = new AtomicBoolean(); + + public ResponseHandlerContext(Context context) { --- End diff -- Sorry, missed that. Fixed in 63ae13c24.
---