rkhachatryan commented on a change in pull request #12000: URL: https://github.com/apache/flink/pull/12000#discussion_r422905043
########## File path: flink-tests/src/test/java/org/apache/flink/test/checkpointing/utils/CancellingIntegerSource.java ########## @@ -0,0 +1,127 @@ +/* + * 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.test.checkpointing.utils; + +import org.apache.flink.api.common.state.ListState; +import org.apache.flink.api.common.state.ListStateDescriptor; +import org.apache.flink.configuration.Configuration; +import org.apache.flink.runtime.state.CheckpointListener; +import org.apache.flink.runtime.state.FunctionInitializationContext; +import org.apache.flink.runtime.state.FunctionSnapshotContext; +import org.apache.flink.streaming.api.checkpoint.CheckpointedFunction; +import org.apache.flink.streaming.api.functions.source.RichSourceFunction; + +import javax.annotation.Nullable; + +import java.util.Iterator; + +import static java.util.Collections.singletonList; +import static org.apache.flink.util.Preconditions.checkArgument; +import static org.apache.flink.util.Preconditions.checkState; + +/** + * Integer source that cancels itself after a specified number emitted and subsequent checkpoint is fully completed. + */ +public class CancellingIntegerSource extends RichSourceFunction<Integer> implements CheckpointedFunction, CheckpointListener { + + private final int count; + private final Integer cancelAfter; + + @Nullable private transient Long cancelAfterCheckpointId; + private transient volatile boolean isCanceled; + private transient volatile int sentCount; + private transient ListState<Integer> lastSentStored; + + private CancellingIntegerSource(int count, @Nullable Integer cancelAfter) { + checkArgument(count > 0); + checkArgument(cancelAfter == null || cancelAfter > 0); + this.cancelAfter = cancelAfter; + this.count = count; + } + + @Override + public void run(SourceContext<Integer> ctx) throws InterruptedException { + emitInLoop(ctx); + awaitCancellation(); + } + + private void emitInLoop(SourceContext<Integer> ctx) throws InterruptedException { + while (sentCount < count && !isCanceled) { + synchronized (ctx.getCheckpointLock()) { + if (sentCount < count && !isCanceled) { + ctx.collect(sentCount++); + } + } + Thread.sleep(10); // allow to snapshot state (Thread.yield() doesn't always work) + } + } + + private void awaitCancellation() { + while (!isCanceled) { + try { + Thread.sleep(50); + } catch (InterruptedException e) { + if (isCanceled) { + Thread.currentThread().interrupt(); + } + } + } + } + + @Override + public void initializeState(FunctionInitializationContext context) throws Exception { + lastSentStored = context.getOperatorStateStore().getListState(new ListStateDescriptor<>("counter", Integer.class)); + if (context.isRestored()) { + Iterator<Integer> iterator = lastSentStored.get().iterator(); + checkState(iterator.hasNext()); + sentCount = iterator.next(); + checkState(!iterator.hasNext()); + } + checkState(cancelAfter == null || sentCount < cancelAfter); + } + + @Override + public void open(Configuration parameters) throws Exception { + super.open(parameters); + } + + @Override + public void snapshotState(FunctionSnapshotContext context) throws Exception { + lastSentStored.update(singletonList(sentCount)); + if (cancelAfter != null && cancelAfter <= sentCount && cancelAfterCheckpointId == null) { + cancelAfterCheckpointId = context.getCheckpointId(); + } + } + + @Override + public void notifyCheckpointComplete(long checkpointId) { + if (cancelAfterCheckpointId != null && cancelAfterCheckpointId == checkpointId) { + cancel(); + } + } + + @Override + public void cancel() { + isCanceled = true; + } + + public static CancellingIntegerSource upTo(int count, boolean continueAfterCount) { Review comment: Changed to `max`. ---------------------------------------------------------------- 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: us...@infra.apache.org
