guoweiM commented on a change in pull request #7: URL: https://github.com/apache/flink-ml/pull/7#discussion_r738052142
########## File path: flink-ml-iteration/src/main/java/org/apache/flink/iteration/operator/HeadOperator.java ########## @@ -0,0 +1,224 @@ +/* + * 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.flink.iteration.operator; + +import org.apache.flink.annotation.VisibleForTesting; +import org.apache.flink.api.common.operators.MailboxExecutor; +import org.apache.flink.iteration.IterationID; +import org.apache.flink.iteration.IterationRecord; +import org.apache.flink.iteration.broadcast.BroadcastOutput; +import org.apache.flink.iteration.broadcast.BroadcastOutputFactory; +import org.apache.flink.iteration.operator.event.GloballyAlignedEvent; +import org.apache.flink.iteration.operator.event.SubtaskAlignedEvent; +import org.apache.flink.runtime.operators.coordination.OperatorEvent; +import org.apache.flink.runtime.operators.coordination.OperatorEventGateway; +import org.apache.flink.runtime.operators.coordination.OperatorEventHandler; +import org.apache.flink.runtime.state.StateInitializationContext; +import org.apache.flink.statefun.flink.core.feedback.FeedbackChannel; +import org.apache.flink.statefun.flink.core.feedback.FeedbackChannelBroker; +import org.apache.flink.statefun.flink.core.feedback.FeedbackConsumer; +import org.apache.flink.statefun.flink.core.feedback.FeedbackKey; +import org.apache.flink.statefun.flink.core.feedback.SubtaskFeedbackKey; +import org.apache.flink.streaming.api.graph.StreamConfig; +import org.apache.flink.streaming.api.operators.AbstractStreamOperator; +import org.apache.flink.streaming.api.operators.BoundedOneInput; +import org.apache.flink.streaming.api.operators.OneInputStreamOperator; +import org.apache.flink.streaming.api.operators.Output; +import org.apache.flink.streaming.runtime.streamrecord.StreamRecord; +import org.apache.flink.streaming.runtime.tasks.ProcessingTimeService; +import org.apache.flink.streaming.runtime.tasks.StreamTask; +import org.apache.flink.util.ExceptionUtils; + +import java.util.HashMap; +import java.util.Map; +import java.util.Objects; +import java.util.concurrent.Executor; + +/** + * The head operators unions the initialized variable stream and the feedback stream, and + * synchronize the epoch watermark (round). + */ +public class HeadOperator extends AbstractStreamOperator<IterationRecord<?>> + implements OneInputStreamOperator<IterationRecord<?>, IterationRecord<?>>, + FeedbackConsumer<StreamRecord<IterationRecord<?>>>, + OperatorEventHandler, + BoundedOneInput { + + private final IterationID iterationId; + + private final int feedbackIndex; + + private final boolean isCriteriaStream; + + private final OperatorEventGateway operatorEventGateway; + + private final MailboxExecutor mailboxExecutor; + + private final Map<Integer, Long> numFeedbackRecordsPerEpoch; + + private transient BroadcastOutput<?> eventBroadcastOutput; + + private transient StreamRecord<IterationRecord<?>> reusable; + + private transient boolean shouldTerminate; + + public HeadOperator( + IterationID iterationId, + int feedbackIndex, + boolean isCriteriaStream, + MailboxExecutor mailboxExecutor, + OperatorEventGateway operatorEventGateway, + ProcessingTimeService processingTimeService) { + this.iterationId = Objects.requireNonNull(iterationId); + this.feedbackIndex = feedbackIndex; + this.isCriteriaStream = isCriteriaStream; + this.mailboxExecutor = Objects.requireNonNull(mailboxExecutor); + this.operatorEventGateway = Objects.requireNonNull(operatorEventGateway); + this.numFeedbackRecordsPerEpoch = new HashMap<>(); + + // Even though this operator does not use the processing + // time service, AbstractStreamOperator requires this + // field is non-null, otherwise we get a NullPointerException + super.processingTimeService = processingTimeService; + } + + @Override + public void setup( + StreamTask<?, ?> containingTask, + StreamConfig config, + Output<StreamRecord<IterationRecord<?>>> output) { + super.setup(containingTask, config, output); + eventBroadcastOutput = + BroadcastOutputFactory.createBroadcastOutput( + output, metrics.getIOMetricGroup().getNumRecordsOutCounter()); + } + + @Override + public void initializeState(StateInitializationContext context) throws Exception { + super.initializeState(context); + + reusable = new StreamRecord<>(null); + + // Here we register a record Review comment: record or consumer? or mail type? -- This is an automated message from the Apache Git Service. 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