| /** |
| * 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.fs; |
| |
| import java.util.Iterator; |
| import java.util.NoSuchElementException; |
| |
| import org.apache.hadoop.thirdparty.com.google.common.base.Preconditions; |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| import org.apache.hadoop.fs.FileSystem.Statistics.StatisticsData; |
| |
| /** |
| * A basic StorageStatistics instance which simply returns data from |
| * FileSystem#Statistics. |
| */ |
| @InterfaceAudience.Private |
| @InterfaceStability.Unstable |
| public class FileSystemStorageStatistics extends StorageStatistics { |
| /** |
| * The per-class FileSystem statistics. |
| */ |
| private final FileSystem.Statistics stats; |
| |
| private static final String[] KEYS = { |
| "bytesRead", |
| "bytesWritten", |
| "readOps", |
| "largeReadOps", |
| "writeOps", |
| "bytesReadLocalHost", |
| "bytesReadDistanceOfOneOrTwo", |
| "bytesReadDistanceOfThreeOrFour", |
| "bytesReadDistanceOfFiveOrLarger", |
| "bytesReadErasureCoded" |
| }; |
| |
| private static class LongStatisticIterator |
| implements Iterator<LongStatistic> { |
| private final StatisticsData data; |
| |
| private int keyIdx; |
| |
| LongStatisticIterator(StatisticsData data) { |
| this.data = data; |
| this.keyIdx = 0; |
| } |
| |
| @Override |
| public boolean hasNext() { |
| return (this.keyIdx < KEYS.length); |
| } |
| |
| @Override |
| public LongStatistic next() { |
| if (this.keyIdx >= KEYS.length) { |
| throw new NoSuchElementException(); |
| } |
| String key = KEYS[this.keyIdx++]; |
| Long val = fetch(data, key); |
| return new LongStatistic(key, val.longValue()); |
| } |
| |
| @Override |
| public void remove() { |
| throw new UnsupportedOperationException(); |
| } |
| } |
| |
| private static Long fetch(StatisticsData data, String key) { |
| Preconditions.checkArgument(key != null, |
| "The stat key of FileSystemStorageStatistics should not be null!"); |
| |
| switch (key) { |
| case "bytesRead": |
| return data.getBytesRead(); |
| case "bytesWritten": |
| return data.getBytesWritten(); |
| case "readOps": |
| return (long) (data.getReadOps() + data.getLargeReadOps()); |
| case "largeReadOps": |
| return Long.valueOf(data.getLargeReadOps()); |
| case "writeOps": |
| return Long.valueOf(data.getWriteOps()); |
| case "bytesReadLocalHost": |
| return data.getBytesReadLocalHost(); |
| case "bytesReadDistanceOfOneOrTwo": |
| return data.getBytesReadDistanceOfOneOrTwo(); |
| case "bytesReadDistanceOfThreeOrFour": |
| return data.getBytesReadDistanceOfThreeOrFour(); |
| case "bytesReadDistanceOfFiveOrLarger": |
| return data.getBytesReadDistanceOfFiveOrLarger(); |
| case "bytesReadErasureCoded": |
| return data.getBytesReadErasureCoded(); |
| default: |
| return null; |
| } |
| } |
| |
| FileSystemStorageStatistics(String name, FileSystem.Statistics stats) { |
| super(name); |
| Preconditions.checkArgument(stats != null, |
| "FileSystem.Statistics can not be null"); |
| Preconditions.checkArgument(stats.getData() != null, |
| "FileSystem.Statistics can not have null data"); |
| this.stats = stats; |
| } |
| |
| @Override |
| public String getScheme() { |
| return stats.getScheme(); |
| } |
| |
| @Override |
| public Iterator<LongStatistic> getLongStatistics() { |
| return new LongStatisticIterator(stats.getData()); |
| } |
| |
| @Override |
| public Long getLong(String key) { |
| return fetch(stats.getData(), key); |
| } |
| |
| /** |
| * Return true if a statistic is being tracked. |
| * |
| * @return True only if the statistic is being tracked. |
| */ |
| @Override |
| public boolean isTracked(String key) { |
| for (String k: KEYS) { |
| if (k.equals(key)) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| @Override |
| public void reset() { |
| stats.reset(); |
| } |
| } |