| /* |
| * 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.wayang.profiler.util; |
| |
| import java.io.IOException; |
| import java.util.Arrays; |
| import org.apache.logging.log4j.LogManager; |
| import org.apache.logging.log4j.Logger; |
| import org.rrd4j.ConsolFun; |
| import org.rrd4j.core.FetchData; |
| import org.rrd4j.core.FetchRequest; |
| import org.rrd4j.core.RrdBackendFactory; |
| import org.rrd4j.core.RrdDb; |
| |
| /** |
| * Utility to read from an RRD file. |
| */ |
| public class RrdAccessor implements AutoCloseable { |
| |
| private final Logger logger = LogManager.getLogger(this.getClass()); |
| |
| private final RrdDb rrdDb; |
| |
| private RrdAccessor(RrdDb rrdDb) { |
| this.rrdDb = rrdDb; |
| try { |
| this.logger.info("Opened RRD with {} archives and data sources {}.", rrdDb.getArcCount(), Arrays.toString(rrdDb.getDsNames())); |
| } catch (Throwable t) { |
| throw new RuntimeException(t); |
| } |
| } |
| |
| public static RrdAccessor open(String rrdPath) { |
| try { |
| final RrdDb rrdDb = new RrdDb("", "rrdtool:/" + rrdPath, RrdBackendFactory.getFactory("MEMORY")); |
| rrdDb.getLastUpdateTime(); |
| return new RrdAccessor(rrdDb); |
| } catch (IOException e) { |
| throw new RuntimeException("Could not open RRD.", e); |
| } |
| } |
| |
| public double query(String dsName, long startTimestamp, long endTimestamp, ConsolFun consolidationFunction) { |
| long tStart = convertToUnixTimestamp(startTimestamp); |
| long tEnd = convertToUnixTimestamp(endTimestamp); |
| if (tStart == tEnd) { |
| this.logger.warn("Shifting end time by 1 second because it is identical with the start time."); |
| tEnd++; |
| } |
| try { |
| final FetchRequest request = this.rrdDb.createFetchRequest(consolidationFunction, tStart, tEnd); |
| final FetchData fetchData = request.fetchData(); |
| return fetchData.getAggregate(dsName, consolidationFunction); |
| } catch (IOException e) { |
| e.printStackTrace(); |
| return Double.NaN; |
| } |
| } |
| |
| public long getLastUpdateMillis() { |
| try { |
| return convertToJavaTimestamp(this.rrdDb.getLastUpdateTime()); |
| } catch (IOException e) { |
| e.printStackTrace(); |
| return -1; |
| } |
| } |
| |
| public static long convertToUnixTimestamp(long javaTimestamp) { |
| return (javaTimestamp + 500) / 1000; |
| } |
| |
| public static long convertToJavaTimestamp(long unixTimestamp) { |
| return unixTimestamp * 1000 + 500; |
| } |
| |
| @Override |
| public void close() { |
| if (this.rrdDb != null) { |
| try { |
| this.rrdDb.close(); |
| } catch (IOException e) { |
| e.printStackTrace(); |
| } |
| } |
| } |
| } |