| /* |
| * 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.spi.blob.stats; |
| |
| import java.io.FilterInputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.util.concurrent.TimeUnit; |
| |
| import com.google.common.io.CountingInputStream; |
| |
| |
| public final class StatsCollectingStreams { |
| |
| public static InputStream wrap(final BlobStatsCollector collector, final String blobId, InputStream in) { |
| final CountingInputStream cin = new CountingInputStream(in); |
| return new FilterInputStream(cin) { |
| final long startTime = System.nanoTime(); |
| |
| @Override |
| public void close() throws IOException { |
| super.close(); |
| //We rely on close to determine how much was downloaded |
| //as once an InputStream is exposed its not possible to |
| //determine if the stream is actually used |
| |
| //Download time might not be accurate as reading code might |
| //be processing also as it moved further in stream. So that |
| //overhead would add to the download time |
| |
| collector.downloaded(blobId, System.nanoTime() - startTime, TimeUnit.NANOSECONDS, cin.getCount()); |
| collector.downloadCompleted(blobId); |
| } |
| }; |
| } |
| } |