| /* |
| * Copyright 2014 Google 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.google.gwt.dev.util; |
| |
| import com.google.gwt.core.ext.TreeLogger; |
| import com.google.gwt.thirdparty.guava.common.base.Joiner; |
| import com.google.gwt.util.tools.shared.Md5Utils; |
| import com.google.gwt.util.tools.shared.StringUtils; |
| |
| import java.io.File; |
| import java.util.List; |
| |
| /** |
| * General utility functions for disk caching. |
| */ |
| public class DiskCachingUtil { |
| |
| /** |
| * Computes and returns a consistent preferred cache dir based on the given set of module names |
| * and the current working directory. |
| * <p> |
| * Using a consistent cache dir has performance advantages since caches can be reused between JVM |
| * process launches. |
| */ |
| public static synchronized File computePreferredCacheDir(List<String> moduleNames, |
| TreeLogger logger) { |
| String tempDir = System.getProperty("java.io.tmpdir"); |
| String currentWorkingDirectory = System.getProperty("user.dir"); |
| String preferredCacheDirName = "gwt-cache-" + StringUtils.toHexString( |
| Md5Utils.getMd5Digest(currentWorkingDirectory + Joiner.on(", ").join(moduleNames))); |
| |
| File preferredCacheDir = new File(tempDir, preferredCacheDirName); |
| if (!preferredCacheDir.exists() && !preferredCacheDir.mkdir()) { |
| logger.log(TreeLogger.WARN, "Can't create cache directory: " + preferredCacheDir); |
| return null; |
| } |
| return preferredCacheDir; |
| } |
| } |