Brett Chabot | e8062c1 | 2011-01-22 13:30:17 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2011 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
Brett Chabot | beaebb0 | 2011-02-07 16:16:06 -0800 | [diff] [blame] | 16 | package com.android.tradefed.build; |
Brett Chabot | e8062c1 | 2011-01-22 13:30:17 -0800 | [diff] [blame] | 17 | |
| 18 | import java.io.File; |
| 19 | import java.util.Collections; |
| 20 | import java.util.HashMap; |
| 21 | import java.util.Map; |
| 22 | |
| 23 | /** |
| 24 | * A factory for creating {@link FileDownloadCache} |
| 25 | */ |
| 26 | public class FileDownloadCacheFactory { |
| 27 | |
| 28 | // use the "singleton inner class" pattern |
| 29 | // http://en.wikipedia.org/wiki/Singleton_pattern#The_solution_of_Bill_Pugh |
| 30 | private static class SingletonHolder { |
| 31 | public static final FileDownloadCacheFactory INSTANCE = new FileDownloadCacheFactory(); |
| 32 | } |
| 33 | |
| 34 | private Map<String, FileDownloadCache> mCacheObjectMap = Collections.synchronizedMap( |
| 35 | new HashMap<String, FileDownloadCache>()); |
| 36 | |
| 37 | /** |
| 38 | * Get the singleton instance of FileDownloadCacheFactory |
Brett Chabot | e8062c1 | 2011-01-22 13:30:17 -0800 | [diff] [blame] | 39 | */ |
| 40 | public static FileDownloadCacheFactory getInstance() { |
| 41 | return SingletonHolder.INSTANCE; |
| 42 | } |
| 43 | |
| 44 | /** |
| 45 | * Retrieve the {@link FileDownloadCache} with the given cache directory, creating if necessary. |
| 46 | * <p/> |
| 47 | * Note that the cache assumes that this process has exclusive access to the <var>cacheDir</var> |
| 48 | * directory. If multiple TF processes will be run on the same machine, they MUST each use |
| 49 | * unique cache directories. |
| 50 | * |
| 51 | * @param cacheDir the local filesystem directory to use as a cache |
| 52 | * @return the {@link FileDownloadCache} for given cacheDir |
| 53 | */ |
Brett Chabot | 0b9e62c | 2011-02-01 20:28:22 -0800 | [diff] [blame] | 54 | public synchronized FileDownloadCache getCache(File cacheDir) { |
Brett Chabot | e8062c1 | 2011-01-22 13:30:17 -0800 | [diff] [blame] | 55 | FileDownloadCache cache = mCacheObjectMap.get(cacheDir.getAbsolutePath()); |
| 56 | if (cache == null) { |
| 57 | cache = new FileDownloadCache(cacheDir); |
Brett Chabot | 6b70f87 | 2011-02-01 23:08:17 -0800 | [diff] [blame] | 58 | mCacheObjectMap.put(cacheDir.getAbsolutePath(), cache); |
Brett Chabot | e8062c1 | 2011-01-22 13:30:17 -0800 | [diff] [blame] | 59 | } |
| 60 | return cache; |
| 61 | } |
| 62 | } |