wu-sheng commented on a change in pull request #8696: URL: https://github.com/apache/skywalking/pull/8696#discussion_r830461537
########## File path: oap-server/server-core/src/main/java/org/apache/skywalking/oap/server/core/profiling/ebpf/analyze/EBPFProfilingAnalyzer.java ########## @@ -0,0 +1,157 @@ +/* + * 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.skywalking.oap.server.core.profiling.ebpf.analyze; + +import org.apache.skywalking.oap.server.core.profiling.ebpf.storage.EBPFProfilingDataRecord; +import org.apache.skywalking.oap.server.core.query.type.EBPFProfilingAnalyzation; +import org.apache.skywalking.oap.server.core.query.type.EBPFProfilingAnalyzeTimeRange; +import org.apache.skywalking.oap.server.core.query.type.EBPFProfilingTree; +import org.apache.skywalking.oap.server.core.storage.StorageModule; +import org.apache.skywalking.oap.server.core.storage.profiling.ebpf.IEBPFProfilingDataDAO; +import org.apache.skywalking.oap.server.library.module.ModuleManager; +import org.apache.skywalking.oap.server.library.util.CollectionUtils; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import java.io.IOException; +import java.util.ArrayList; +import java.util.Collection; +import java.util.Collections; +import java.util.List; +import java.util.Map; +import java.util.Objects; +import java.util.concurrent.TimeUnit; +import java.util.stream.Collectors; + +public class EBPFProfilingAnalyzer { + + private static final Logger LOGGER = LoggerFactory.getLogger(EBPFProfilingAnalyzer.class); + + private static final EBPFProfilingAnalyzeCollector ANALYZE_COLLECTOR = new EBPFProfilingAnalyzeCollector(); + private static final Long FETCH_FETCH_DURATION = TimeUnit.MINUTES.toMillis(2); + + private final ModuleManager moduleManager; + protected IEBPFProfilingDataDAO dataDAO; + + public EBPFProfilingAnalyzer(ModuleManager moduleManager) { + this.moduleManager = moduleManager; + } + + /** + * search data and analyze + */ + public EBPFProfilingAnalyzation analyze(String taskId, List<EBPFProfilingAnalyzeTimeRange> ranges) throws IOException { + EBPFProfilingAnalyzation analyzation = new EBPFProfilingAnalyzation(); + + List<TimeRange> timeRanges = buildTimeRanges(ranges); + if (CollectionUtils.isEmpty(timeRanges)) { + analyzation.setTip("data not found"); + return analyzation; + } + + // query data + List<EBPFProfilingStack> stacks = timeRanges.parallelStream().map(r -> { + try { + return getDataDAO().queryData(taskId, r.minTime, r.maxTime); + } catch (IOException e) { + LOGGER.warn(e.getMessage(), e); + return Collections.<EBPFProfilingDataRecord>emptyList(); + } + }).flatMap(Collection::stream).map(e -> { + try { + return EBPFProfilingStack.deserialize(e); + } catch (Exception ex) { + LOGGER.warn("could not deserialize the stack", ex); + return null; + } + }).filter(Objects::nonNull).distinct().collect(Collectors.toList()); + + // analyze + final List<EBPFProfilingTree> trees = analyze(stacks); + if (trees != null) { + analyzation.getTrees().addAll(trees); + } + + return analyzation; + } + + protected List<TimeRange> buildTimeRanges(List<EBPFProfilingAnalyzeTimeRange> timeRanges) { + return timeRanges.parallelStream() + .map(r -> buildTimeRanges(r.getStart(), r.getEnd())) + .filter(Objects::nonNull) + .flatMap(Collection::stream) + .collect(Collectors.toList()); + } + + protected List<TimeRange> buildTimeRanges(long start, long end) { + if (start >= end) { + return null; + } + + // include latest millisecond + end += 1; + + final List<TimeRange> timeRanges = new ArrayList<>(); + do { + long batchEnd = Math.min(start + FETCH_FETCH_DURATION, end); + timeRanges.add(new TimeRange(start, batchEnd)); + start = batchEnd; + } + while (start < end); + + return timeRanges; + } + + /** + * Analyze records + */ + protected List<EBPFProfilingTree> analyze(List<EBPFProfilingStack> stacks) { + if (CollectionUtils.isEmpty(stacks)) { + return null; + } + + // using parallel stream + Map<EBPFProfilingStack.Symbol, EBPFProfilingTree> stackTrees = stacks.parallelStream() + // stack list cannot be empty + .filter(s -> CollectionUtils.isNotEmpty(s.getSymbols())) + .collect(Collectors.groupingBy(s -> s.getSymbols() + .get(0), ANALYZE_COLLECTOR)); + + return new ArrayList<>(stackTrees.values()); + } + + protected IEBPFProfilingDataDAO getDataDAO() { + if (dataDAO == null) { + dataDAO = moduleManager.find(StorageModule.NAME) + .provider() + .getService(IEBPFProfilingDataDAO.class); + } + return dataDAO; + } + + private static class TimeRange { Review comment: Then please add comments. 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