001/* 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, software 013 * distributed under the License is distributed on an "AS IS" BASIS, 014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 015 * See the License for the specific language governing permissions and 016 * limitations under the License. 017 */ 018package org.apache.hadoop.hbase.client; 019 020import java.io.IOException; 021import org.apache.hadoop.hbase.client.metrics.ScanMetrics; 022import org.apache.hadoop.hbase.trace.TraceUtil; 023 024/** 025 * A drop-in replacement for {@link BufferingScanResultConsumer} that adds tracing spans to its 026 * implementation of the {@link AdvancedScanResultConsumer} API. 027 */ 028public class TracedAdvancedScanResultConsumer implements AdvancedScanResultConsumer { 029 030 private final BufferingScanResultConsumer delegate = new BufferingScanResultConsumer(); 031 032 @Override 033 public void onScanMetricsCreated(ScanMetrics scanMetrics) { 034 TraceUtil.trace(() -> delegate.onScanMetricsCreated(scanMetrics), 035 "TracedAdvancedScanResultConsumer#onScanMetricsCreated"); 036 } 037 038 @Override 039 public void onNext(Result[] results, ScanController controller) { 040 TraceUtil.trace(() -> delegate.onNext(results, controller), 041 "TracedAdvancedScanResultConsumer#onNext"); 042 } 043 044 @Override 045 public void onError(Throwable error) { 046 TraceUtil.trace(() -> delegate.onError(error), "TracedAdvancedScanResultConsumer#onError"); 047 } 048 049 @Override 050 public void onComplete() { 051 TraceUtil.trace(delegate::onComplete, "TracedAdvancedScanResultConsumer#onComplete"); 052 } 053 054 public Result take() throws IOException, InterruptedException { 055 return delegate.take(); 056 } 057 058 public ScanMetrics getScanMetrics() { 059 return delegate.getScanMetrics(); 060 } 061}