| /* |
| * Copyright 2012-present Facebook, Inc. |
| * |
| * Licensed 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 com.facebook.buck.rules; |
| |
| import static java.nio.file.StandardCopyOption.REPLACE_EXISTING; |
| |
| import com.google.common.base.Preconditions; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.nio.file.Files; |
| import java.nio.file.Path; |
| import java.util.logging.Level; |
| import java.util.logging.Logger; |
| |
| public class DirArtifactCache implements ArtifactCache { |
| private final static Logger logger = Logger.getLogger(DirArtifactCache.class.getName()); |
| |
| private final File cacheDir; |
| |
| public DirArtifactCache(File cacheDir) throws IOException { |
| this.cacheDir = Preconditions.checkNotNull(cacheDir); |
| Files.createDirectories(cacheDir.toPath()); |
| } |
| |
| @Override |
| public CacheResult fetch(RuleKey ruleKey, File output) { |
| CacheResult success = CacheResult.MISS; |
| File cacheEntry = new File(cacheDir, ruleKey.toString()); |
| if (cacheEntry.exists()) { |
| try { |
| Files.createDirectories(output.toPath().getParent()); |
| Files.copy(cacheEntry.toPath(), output.toPath(), REPLACE_EXISTING); |
| success = CacheResult.DIR_HIT; |
| } catch (IOException e) { |
| logger.warning(String.format("Artifact fetch(%s, %s) error: %s", |
| ruleKey, |
| output.getPath(), |
| e.getMessage())); |
| } |
| } |
| logger.info(String.format("Artifact fetch(%s, %s) cache %s", |
| ruleKey, |
| output.getPath(), |
| (success.isSuccess() ? "hit" : "miss"))); |
| return success; |
| } |
| |
| @Override |
| public void store(RuleKey ruleKey, File output) { |
| File cacheEntry = new File(cacheDir, ruleKey.toString()); |
| Path tmpCacheEntry = null; |
| try { |
| // Write to a temporary file and move the file to its final location atomically to protect |
| // against partial artifacts (whether due to buck interruption or filesystem failure) posing |
| // as valid artifacts during subsequent buck runs. |
| tmpCacheEntry = File.createTempFile(ruleKey.toString(), ".tmp", cacheDir).toPath(); |
| Files.copy(output.toPath(), tmpCacheEntry, REPLACE_EXISTING); |
| Files.move(tmpCacheEntry, cacheEntry.toPath()); |
| } catch (IOException e) { |
| logger.warning(String.format("Artifact store(%s, %s) error: %s", |
| ruleKey, |
| output.getPath(), |
| e.getMessage())); |
| if (tmpCacheEntry != null) { |
| try { |
| Files.deleteIfExists(tmpCacheEntry); |
| } catch (IOException ignored) { |
| // Unable to delete a temporary file. Nothing sane to do. |
| logger.log(Level.INFO, "Unable to delete temp cache file", ignored); |
| } |
| } |
| } |
| } |
| |
| /** @return {@code true}: storing artifacts is always supported by this class. */ |
| @Override |
| public boolean isStoreSupported() { |
| return true; |
| } |
| } |