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.util.List;
021import org.apache.hadoop.hbase.client.metrics.ScanMetrics;
022import org.apache.hadoop.hbase.trace.TraceUtil;
023
024/**
025 * A wrapper over {@link SimpleScanResultConsumer} that adds tracing of spans to its implementation.
026 */
027class TracedScanResultConsumer implements SimpleScanResultConsumer {
028
029  private final SimpleScanResultConsumer delegate;
030
031  public TracedScanResultConsumer(final SimpleScanResultConsumer delegate) {
032    this.delegate = delegate;
033  }
034
035  @Override
036  public void onScanMetricsCreated(ScanMetrics scanMetrics) {
037    TraceUtil.trace(() -> delegate.onScanMetricsCreated(scanMetrics),
038      "TracedScanResultConsumer#onScanMetricsCreated");
039  }
040
041  @Override
042  public boolean onNext(Result result) {
043    return TraceUtil.trace(() -> delegate.onNext(result), "TracedScanResultConsumer#onNext");
044  }
045
046  @Override
047  public void onError(Throwable error) {
048    TraceUtil.trace(() -> delegate.onError(error), "TracedScanResultConsumer#onError");
049  }
050
051  @Override
052  public void onComplete() {
053    TraceUtil.trace(delegate::onComplete, "TracedScanResultConsumer#onComplete");
054  }
055
056  @Override
057  public List<Result> getAll() throws Exception {
058    return delegate.getAll();
059  }
060
061  @Override
062  public ScanMetrics getScanMetrics() {
063    return delegate.getScanMetrics();
064  }
065}