Line data    Source code

       1             : // Copyright (C) 2014 The Android Open Source Project
       2             : //
       3             : // Licensed under the Apache License, Version 2.0 (the "License");
       4             : // you may not use this file except in compliance with the License.
       5             : // You may obtain a copy of the License at
       6             : //
       7             : // http://www.apache.org/licenses/LICENSE-2.0
       8             : //
       9             : // Unless required by applicable law or agreed to in writing, software
      10             : // distributed under the License is distributed on an "AS IS" BASIS,
      11             : // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
      12             : // See the License for the specific language governing permissions and
      13             : // limitations under the License.
      14             : 
      15             : package com.google.gerrit.common;
      16             : 
      17             : import static com.google.common.flogger.LazyArgs.lazy;
      18             : import static com.google.gerrit.common.FileUtil.lastModified;
      19             : import static java.util.stream.Collectors.joining;
      20             : 
      21             : import com.google.common.collect.ComparisonChain;
      22             : import com.google.common.collect.ImmutableList;
      23             : import com.google.common.collect.Ordering;
      24             : import com.google.common.flogger.FluentLogger;
      25             : import java.io.IOException;
      26             : import java.nio.file.DirectoryStream;
      27             : import java.nio.file.Files;
      28             : import java.nio.file.NoSuchFileException;
      29             : import java.nio.file.Path;
      30             : import java.util.List;
      31             : 
      32             : public final class SiteLibraryLoaderUtil {
      33         138 :   private static final FluentLogger logger = FluentLogger.forEnclosingClass();
      34             : 
      35             :   public static void loadSiteLib(Path libdir) {
      36             :     try {
      37         138 :       List<Path> jars = listJars(libdir);
      38         138 :       IoUtil.loadJARs(jars);
      39         138 :       logger.atFine().log("Loaded site libraries: %s", lazy(() -> jarList(jars)));
      40           0 :     } catch (IOException e) {
      41           0 :       logger.atSevere().withCause(e).log("Error scanning lib directory %s", libdir);
      42         138 :     }
      43         138 :   }
      44             : 
      45             :   private static String jarList(List<Path> jars) {
      46           9 :     return jars.stream().map(p -> p.getFileName().toString()).collect(joining(","));
      47             :   }
      48             : 
      49             :   public static List<Path> listJars(Path dir) throws IOException {
      50         138 :     DirectoryStream.Filter<Path> filter =
      51             :         entry -> {
      52           0 :           String name = entry.getFileName().toString();
      53           0 :           return (name.endsWith(".jar") || name.endsWith(".zip")) && Files.isRegularFile(entry);
      54             :         };
      55          15 :     try (DirectoryStream<Path> jars = Files.newDirectoryStream(dir, filter)) {
      56          15 :       return new Ordering<Path>() {
      57             :         @Override
      58             :         public int compare(Path a, Path b) {
      59             :           // Sort by reverse last-modified time so newer JARs are first.
      60           0 :           return ComparisonChain.start()
      61           0 :               .compare(lastModified(b), lastModified(a))
      62           0 :               .compare(a, b)
      63           0 :               .result();
      64             :         }
      65          15 :       }.sortedCopy(jars);
      66         138 :     } catch (NoSuchFileException nsfe) {
      67         138 :       return ImmutableList.of();
      68             :     }
      69             :   }
      70             : 
      71             :   private SiteLibraryLoaderUtil() {}
      72             : }