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HBASE-22036 Rewrite TestScannerHeartbeatMessages
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hbase-server/src/test/java/org/apache/hadoop/hbase/client/ScanPerNextResultScanner.java
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| /** | ||
| * 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.hadoop.hbase.client; | ||
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| import java.io.IOException; | ||
| import java.io.InterruptedIOException; | ||
| import java.util.ArrayDeque; | ||
| import java.util.Queue; | ||
| import org.apache.hadoop.hbase.client.metrics.ScanMetrics; | ||
| import org.apache.yetus.audience.InterfaceAudience; | ||
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| import org.apache.hbase.thirdparty.com.google.common.base.Throwables; | ||
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| /** | ||
| * A ResultScanner which will only send request to RS when there are no cached results when calling | ||
| * next, just like the ResultScanner in the old time. Mainly used for writing UTs, that we can | ||
| * control when to send request to RS. The default ResultScanner implementation will fetch in | ||
| * background. | ||
| */ | ||
| @InterfaceAudience.Private | ||
| public class ScanPerNextResultScanner implements ResultScanner, AdvancedScanResultConsumer { | ||
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| private final AsyncTable<AdvancedScanResultConsumer> table; | ||
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| private final Scan scan; | ||
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| private final Queue<Result> queue = new ArrayDeque<>(); | ||
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| private ScanMetrics scanMetrics; | ||
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| private boolean closed = false; | ||
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| private Throwable error; | ||
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| private ScanResumer resumer; | ||
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| public ScanPerNextResultScanner(AsyncTable<AdvancedScanResultConsumer> table, Scan scan) { | ||
| this.table = table; | ||
| this.scan = scan; | ||
| } | ||
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| @Override | ||
| public synchronized void onError(Throwable error) { | ||
| this.error = error; | ||
| notifyAll(); | ||
| } | ||
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| @Override | ||
| public synchronized void onComplete() { | ||
| closed = true; | ||
| notifyAll(); | ||
| } | ||
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| @Override | ||
| public void onScanMetricsCreated(ScanMetrics scanMetrics) { | ||
| this.scanMetrics = scanMetrics; | ||
| } | ||
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| @Override | ||
| public synchronized void onNext(Result[] results, ScanController controller) { | ||
| assert results.length > 0; | ||
| if (closed) { | ||
| controller.terminate(); | ||
| return; | ||
| } | ||
| for (Result result : results) { | ||
| queue.add(result); | ||
| } | ||
| notifyAll(); | ||
| resumer = controller.suspend(); | ||
| } | ||
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| @Override | ||
| public synchronized void onHeartbeat(ScanController controller) { | ||
| if (closed) { | ||
| controller.terminate(); | ||
| return; | ||
| } | ||
| if (scan.isNeedCursorResult()) { | ||
| controller.cursor().ifPresent(c -> queue.add(Result.createCursorResult(c))); | ||
| } | ||
| } | ||
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| @Override | ||
| public synchronized Result next() throws IOException { | ||
| if (queue.isEmpty()) { | ||
| if (resumer != null) { | ||
| resumer.resume(); | ||
| resumer = null; | ||
| } else { | ||
| table.scan(scan, this); | ||
| } | ||
| } | ||
| while (queue.isEmpty()) { | ||
| if (closed) { | ||
| return null; | ||
| } | ||
| if (error != null) { | ||
| Throwables.propagateIfPossible(error, IOException.class); | ||
| throw new IOException(error); | ||
| } | ||
| try { | ||
| wait(); | ||
| } catch (InterruptedException e) { | ||
| throw new InterruptedIOException(); | ||
| } | ||
| } | ||
| return queue.poll(); | ||
| } | ||
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| @Override | ||
| public synchronized void close() { | ||
| closed = true; | ||
| queue.clear(); | ||
| if (resumer != null) { | ||
| resumer.resume(); | ||
| resumer = null; | ||
| } | ||
| notifyAll(); | ||
| } | ||
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| @Override | ||
| public boolean renewLease() { | ||
| // The renew lease operation will be handled in background | ||
| return false; | ||
| } | ||
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| @Override | ||
| public ScanMetrics getScanMetrics() { | ||
| return scanMetrics; | ||
| } | ||
| } |
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