| /* |
| * 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.spi.monitor; |
| |
| import java.io.File; |
| |
| /** |
| * Callback interface that eases the collection of statistics about I/O |
| * operations. |
| */ |
| public interface IOMonitor { |
| |
| /** |
| * Called before a segment is read from the file system. |
| * |
| * @param file File containing the segment. |
| * @param msb Most significant bits of the segment ID. |
| * @param lsb Least significant bits of the segment ID. |
| * @param length Size of the segment. |
| */ |
| void beforeSegmentRead(File file, long msb, long lsb, int length); |
| |
| /** |
| * Called after a segment is read from the file system. This is called only |
| * in case of successful operations. |
| * |
| * @param file File containing the segment. |
| * @param msb Most significant bits of the segment ID. |
| * @param lsb Least significant bits of the segment ID. |
| * @param length Size of the segment. |
| * @param elapsed Time spent by the read operation, in nanoseconds. |
| */ |
| void afterSegmentRead(File file, long msb, long lsb, int length, long elapsed); |
| |
| /** |
| * Called before a segment is written to the file system. |
| * |
| * @param file File containing the segment. |
| * @param msb Most significant bits of the segment ID. |
| * @param lsb Least significant bits of the segment ID. |
| * @param length Size of the segment. |
| */ |
| void beforeSegmentWrite(File file, long msb, long lsb, int length); |
| |
| /** |
| * Called after a segment is written to the file system. This is called only |
| * in case of successful operations. |
| * |
| * @param file File containing the segment. |
| * @param msb Most significant bits of the segment ID. |
| * @param lsb Least significant bits of the segment ID. |
| * @param length Size of the segment. |
| * @param elapsed Time spent by the write operation, in nanoseconds. |
| */ |
| void afterSegmentWrite(File file, long msb, long lsb, int length, long elapsed); |
| |
| } |