| /* |
| * 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.tool.iotrace; |
| |
| import static java.util.Objects.requireNonNull; |
| import static org.apache.jackrabbit.oak.api.Type.STRING; |
| import static org.apache.jackrabbit.oak.commons.PathUtils.elements; |
| import static org.apache.jackrabbit.oak.commons.PathUtils.getName; |
| import static org.apache.jackrabbit.oak.commons.PathUtils.getParentPath; |
| |
| import java.util.List; |
| import java.util.Random; |
| import java.util.function.Consumer; |
| |
| import com.google.common.collect.ImmutableList; |
| import org.apache.jackrabbit.oak.api.PropertyState; |
| import org.apache.jackrabbit.oak.spi.state.NodeState; |
| import org.jetbrains.annotations.NotNull; |
| |
| /** |
| * A random access trace |
| * <p> |
| * When {@link Trace#run(NodeState) run} this trace performs random access call to |
| * paths passed to its constructor. It logs the current path as additional |
| * {@link IOTracer#setContext(List) context}. |
| */ |
| public class RandomAccessTrace implements Trace { |
| public static final String CONTEXT_SPEC = "path"; |
| |
| @NotNull |
| private final Random rnd; |
| |
| private final int count; |
| |
| @NotNull |
| private final List<String> paths; |
| |
| @NotNull |
| private final Consumer<List<String>> context; |
| |
| /** |
| * Create a new instance of a random access trace. |
| * @param paths the list of paths to access |
| * @param seed seed for randomly picking paths |
| * @param count number of paths to trace |
| * @param context consumer to pass the additional context to |
| */ |
| public RandomAccessTrace(@NotNull List<String> paths, long seed, int count, @NotNull Consumer<List<String>> context) { |
| this.rnd = new Random(seed); |
| this.count = count; |
| this.paths = paths; |
| this.context = context; |
| } |
| |
| @Override |
| public void run(@NotNull NodeState root) { |
| if(!paths.isEmpty()) { |
| for (int c = 0; c < count; c++) { |
| String path = paths.get(rnd.nextInt(paths.size())); |
| context.accept(ImmutableList.of(path)); |
| |
| NodeState node = root; |
| for (String name : elements(getParentPath(path))) { |
| node = node.getChildNode(name); |
| } |
| |
| String name = getName(path); |
| if (node.hasProperty(name)) { |
| PropertyState property = requireNonNull(node.getProperty(name)); |
| if (property.isArray()) { |
| for (int k = 0; k < property.count(); k++) { |
| property.getValue(STRING, k); |
| } |
| } else { |
| property.getValue(STRING); |
| } |
| } else { |
| node.getChildNode(name); |
| } |
| } |
| } |
| } |
| |
| } |