|
| 1 | +/* |
| 2 | + * Copyright 2020 the original author or authors. |
| 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 | + */ |
| 16 | + |
| 17 | +package org.gradle.api.internal.tasks.scala; |
| 18 | + |
| 19 | +import sbt.internal.inc.classpath.AbstractClassLoaderCache; |
| 20 | +import sbt.io.IO; |
| 21 | +import scala.Function0; |
| 22 | +import scala.collection.JavaConverters; |
| 23 | + |
| 24 | +import java.io.File; |
| 25 | +import java.io.IOException; |
| 26 | +import java.net.URL; |
| 27 | +import java.net.URLClassLoader; |
| 28 | +import java.util.ArrayList; |
| 29 | +import java.util.List; |
| 30 | +import java.util.Objects; |
| 31 | +import java.util.Set; |
| 32 | +import java.util.stream.Collectors; |
| 33 | + |
| 34 | +/** |
| 35 | + * This class implements AbstractClassLoaderCache in a way that allows safe |
| 36 | + * resource release when entries are evicted. |
| 37 | + * |
| 38 | + * Cache is based on file timestamps, because this method is used in sbt implementation. |
| 39 | + */ |
| 40 | +class TimeCheckingClassLoaderCache implements AbstractClassLoaderCache { |
| 41 | + private final URLClassLoader commonParent; |
| 42 | + private final GuavaBackedClassLoaderCache<Set<TimestampedFile>> cache; |
| 43 | + |
| 44 | + static class TimestampedFile { |
| 45 | + private final File file; |
| 46 | + private final long timestamp; |
| 47 | + |
| 48 | + public TimestampedFile(File file) { |
| 49 | + this.file = file; |
| 50 | + this.timestamp = IO.getModifiedTimeOrZero(file); |
| 51 | + } |
| 52 | + |
| 53 | + @Override |
| 54 | + public boolean equals(Object o) { |
| 55 | + if (this == o) { |
| 56 | + return true; |
| 57 | + } |
| 58 | + if (o == null || getClass() != o.getClass()) { |
| 59 | + return false; |
| 60 | + } |
| 61 | + TimestampedFile that = (TimestampedFile) o; |
| 62 | + return timestamp == that.timestamp && |
| 63 | + Objects.equals(file, that.file); |
| 64 | + } |
| 65 | + |
| 66 | + @Override |
| 67 | + public int hashCode() { |
| 68 | + return Objects.hash(file, timestamp); |
| 69 | + } |
| 70 | + } |
| 71 | + |
| 72 | + public TimeCheckingClassLoaderCache(int maxSize) { |
| 73 | + commonParent = new URLClassLoader(new URL[0]); |
| 74 | + cache = new GuavaBackedClassLoaderCache<>(maxSize); |
| 75 | + } |
| 76 | + |
| 77 | + @Override |
| 78 | + public ClassLoader commonParent() { |
| 79 | + return commonParent; |
| 80 | + } |
| 81 | + |
| 82 | + @Override |
| 83 | + public ClassLoader apply(scala.collection.immutable.List<File> files) { |
| 84 | + try { |
| 85 | + List<File> jFiles = JavaConverters.seqAsJavaList(files); |
| 86 | + return cache.get(getTimestampedFiles(jFiles), () -> { |
| 87 | + ArrayList<URL> urls = new ArrayList<>(jFiles.size()); |
| 88 | + for (File f : jFiles) { |
| 89 | + urls.add(f.toURI().toURL()); |
| 90 | + } |
| 91 | + return new URLClassLoader(urls.toArray(new URL[0]), commonParent); |
| 92 | + }); |
| 93 | + } catch (Exception e) { |
| 94 | + throw new RuntimeException(e); |
| 95 | + } |
| 96 | + } |
| 97 | + |
| 98 | + @Override |
| 99 | + public ClassLoader cachedCustomClassloader(scala.collection.immutable.List<File> files, Function0<ClassLoader> mkLoader) { |
| 100 | + try { |
| 101 | + return cache.get(getTimestampedFiles(JavaConverters.seqAsJavaList(files)), () -> mkLoader.apply()); |
| 102 | + } catch (Exception e) { |
| 103 | + throw new RuntimeException(e); |
| 104 | + } |
| 105 | + } |
| 106 | + |
| 107 | + private Set<TimestampedFile> getTimestampedFiles(List<File> fs) { |
| 108 | + return fs.stream().map(TimestampedFile::new).collect(Collectors.toSet()); |
| 109 | + } |
| 110 | + |
| 111 | + @Override |
| 112 | + public void close() throws IOException { |
| 113 | + cache.clear(); |
| 114 | + commonParent.close(); |
| 115 | + } |
| 116 | +} |