| /* |
| * 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.jackrabbit.oak.segment.file; |
| |
| import static java.util.concurrent.TimeUnit.NANOSECONDS; |
| |
| import java.io.File; |
| |
| import org.apache.jackrabbit.oak.segment.spi.monitor.IOMonitorAdapter; |
| import org.apache.jackrabbit.oak.stats.MeterStats; |
| import org.apache.jackrabbit.oak.stats.StatisticsProvider; |
| import org.apache.jackrabbit.oak.stats.StatsOptions; |
| import org.apache.jackrabbit.oak.stats.TimerStats; |
| import org.jetbrains.annotations.NotNull; |
| |
| /** |
| * This {@code IOMonitor} implementations registers the following monitoring endpoints |
| * with the Metrics library if available: |
| * <ul> |
| * <li>{@link #OAK_SEGMENT_SEGMENT_READ_BYTES}: |
| * a meter metrics for the number of bytes read from tar files</li> |
| * <li>{@link #OAK_SEGMENT_SEGMENT_WRITE_BYTES}: |
| * a meter metrics for the number of bytes written to tar files</li> |
| * <li>{@link #OAK_SEGMENT_SEGMENT_READ_TIME}: |
| * a timer metrics for the time spent reading from tar files</li> |
| * <li>{@link #OAK_SEGMENT_SEGMENT_WRITE_TIME}: |
| * a timer metrics for the time spent writing to tar files</li> |
| * </ul> |
| */ |
| public class MetricsIOMonitor extends IOMonitorAdapter { |
| public static final String OAK_SEGMENT_SEGMENT_READ_BYTES = "oak.segment.segment-read-bytes"; |
| public static final String OAK_SEGMENT_SEGMENT_WRITE_BYTES = "oak.segment.segment-write-bytes"; |
| public static final String OAK_SEGMENT_SEGMENT_READ_TIME = "oak.segment.segment-read-time"; |
| public static final String OAK_SEGMENT_SEGMENT_WRITE_TIME = "oak.segment.segment-write-time"; |
| |
| private final MeterStats segmentReadBytes; |
| private final MeterStats segmentWriteBytes; |
| private final TimerStats segmentReadTime; |
| private final TimerStats segmentWriteTime; |
| |
| public MetricsIOMonitor(@NotNull StatisticsProvider statisticsProvider) { |
| segmentReadBytes = statisticsProvider.getMeter( |
| OAK_SEGMENT_SEGMENT_READ_BYTES, StatsOptions.METRICS_ONLY); |
| segmentWriteBytes = statisticsProvider.getMeter( |
| OAK_SEGMENT_SEGMENT_WRITE_BYTES, StatsOptions.METRICS_ONLY); |
| segmentReadTime = statisticsProvider.getTimer( |
| OAK_SEGMENT_SEGMENT_READ_TIME, StatsOptions.METRICS_ONLY); |
| segmentWriteTime = statisticsProvider.getTimer( |
| OAK_SEGMENT_SEGMENT_WRITE_TIME, StatsOptions.METRICS_ONLY); |
| } |
| |
| @Override |
| public void afterSegmentRead(File file, long msb, long lsb, int length, long elapsed) { |
| segmentReadBytes.mark(length); |
| segmentReadTime.update(elapsed, NANOSECONDS); |
| } |
| |
| @Override |
| public void afterSegmentWrite(File file, long msb, long lsb, int length, long elapsed) { |
| segmentWriteBytes.mark(length); |
| segmentWriteTime.update(elapsed, NANOSECONDS); |
| } |
| } |