jaehwan0214 commented on a change in pull request #304: URL: https://github.com/apache/incubator-nemo/pull/304#discussion_r519583194
########## File path: runtime/executor/src/main/java/org/apache/nemo/runtime/executor/transfer/LocalInputContext.java ########## @@ -0,0 +1,117 @@ +/* + * 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.nemo.runtime.executor.transfer; + +import org.apache.nemo.common.punctuation.Finishmark; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; +import java.util.Iterator; +import java.util.concurrent.ConcurrentLinkedQueue; + +/** + * This class provides a data transfer interface to the receiver side when both the sender and the receiver are in the + * same executor. Since the sender doesn't serialize data, the receiver doesn't need to deserialize data when retrieving + * them. + */ +public final class LocalInputContext extends LocalTransferContext { + private static final Logger LOG = LoggerFactory.getLogger(LocalInputContext.class.getName()); + private ConcurrentLinkedQueue queue; + private LocalOutputContext localOutputContext; + private boolean isClosed = false; + + /** + * Creates a new local input context and connect it to {@param localOutputContext}. + * @param localOutputContext the local output context to which this local input context is connected + */ + public LocalInputContext(final LocalOutputContext localOutputContext) { + super(localOutputContext.getExecutorId(), + localOutputContext.getEdgeId(), + localOutputContext.getSrcTaskIndex(), + localOutputContext.getDstTaskIndex()); + this.localOutputContext = localOutputContext; + this.queue = localOutputContext.getQueue(); + } + + /** + * Closes this local input context. + * @throws RuntimeException if the connected output context hasn't been closed yet, or if there are still data + * left to be processed. + */ + @Override + public void close() throws RuntimeException { + if (!localOutputContext.isClosed()) { + throw new RuntimeException("The parent task writer is still sending data"); + } + if (!queue.isEmpty()) { + throw new RuntimeException("There are data left in this context to be processed"); + } + // Nullify references for potential garbage collection Review comment: Thank you for pointing it out. This check is actually unnecessary because the processing of all of the events in the output context queue is guaranteed. Therefore, I removed it. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected]
