| /******************************************************************************* |
| * Copyright (c) 2017 École Polytechnique de Montréal |
| * |
| * All rights reserved. This program and the accompanying materials are |
| * made available under the terms of the Eclipse Public License 2.0 which |
| * accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| *******************************************************************************/ |
| |
| package org.eclipse.tracecompass.internal.provisional.datastore.core.historytree; |
| |
| import java.io.File; |
| import java.io.IOException; |
| |
| import org.eclipse.jdt.annotation.NonNull; |
| import org.eclipse.tracecompass.datastore.core.interval.HTInterval; |
| import org.eclipse.tracecompass.internal.provisional.datastore.core.historytree.AbstractHistoryTree; |
| import org.eclipse.tracecompass.internal.provisional.datastore.core.historytree.HTNode; |
| |
| /** |
| * A stub history tree for the base abstract history tree |
| * |
| * @author Geneviève Bastien |
| */ |
| public class HistoryTreeStub extends AbstractHistoryTree<HTInterval, HTNode<HTInterval>> { |
| |
| /** |
| * A factory to create leaf and core nodes based on the BaseHtObject object |
| */ |
| public static final IHTNodeFactory<HTInterval, HTNode<HTInterval>> NODE_FACTORY = |
| (t, b, m, seq, p, start) -> new HTNode<>(t, b, m, seq, p, start); |
| |
| /** |
| * Create a new State History from scratch, specifying all configuration |
| * parameters. |
| * |
| * @param stateHistoryFile |
| * The name of the history file |
| * @param blockSize |
| * The size of each "block" on disk in bytes. One node will |
| * always fit in one block. It should be at least 4096. |
| * @param maxChildren |
| * The maximum number of children allowed per core (non-leaf) |
| * node. |
| * @param providerVersion |
| * The version of the state provider. If a file already exists, |
| * and their versions match, the history file will not be rebuilt |
| * uselessly. |
| * @param treeStart |
| * The start time of the history |
| * @throws IOException |
| * If an error happens trying to open/write to the file |
| * specified in the config |
| */ |
| public HistoryTreeStub(File stateHistoryFile, |
| int blockSize, |
| int maxChildren, |
| int providerVersion, |
| long treeStart) throws IOException { |
| |
| super(stateHistoryFile, |
| blockSize, |
| maxChildren, |
| providerVersion, |
| treeStart, |
| HTInterval.INTERVAL_READER); |
| } |
| |
| /** |
| * "Reader" constructor : instantiate a SHTree from an existing tree file on |
| * disk |
| * |
| * @param existingStateFile |
| * Path/filename of the history-file we are to open |
| * @param expProviderVersion |
| * The expected version of the state provider |
| * @throws IOException |
| * If an error happens reading the file |
| */ |
| public HistoryTreeStub(File existingStateFile, |
| int expProviderVersion) throws IOException { |
| super(existingStateFile, expProviderVersion, HTInterval.INTERVAL_READER); |
| } |
| |
| @Override |
| protected int getMagicNumber() { |
| return 12345; |
| } |
| |
| @Override |
| protected int getFileVersion() { |
| return 0; |
| } |
| |
| @Override |
| protected IHTNodeFactory<HTInterval, HTNode<HTInterval>> getNodeFactory() { |
| return NODE_FACTORY; |
| } |
| |
| @Override |
| protected long getNewBranchStart(int depth, @NonNull HTInterval interval) { |
| return getTreeEnd(); |
| } |
| |
| } |