com.google.gerrit.common.SiteLibraryLoaderUtil Maven / Gradle / Ivy
// Copyright (C) 2014 The Android Open Source Project
//
// 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.gerrit.common;
import static com.google.common.flogger.LazyArgs.lazy;
import static com.google.gerrit.common.FileUtil.lastModified;
import static java.util.stream.Collectors.joining;
import com.google.common.annotations.GwtIncompatible;
import com.google.common.collect.ComparisonChain;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Ordering;
import com.google.common.flogger.FluentLogger;
import java.io.IOException;
import java.nio.file.DirectoryStream;
import java.nio.file.Files;
import java.nio.file.NoSuchFileException;
import java.nio.file.Path;
import java.util.List;
@GwtIncompatible("Unemulated classes in java.nio and Guava")
public final class SiteLibraryLoaderUtil {
private static final FluentLogger logger = FluentLogger.forEnclosingClass();
public static void loadSiteLib(Path libdir) {
try {
List jars = listJars(libdir);
IoUtil.loadJARs(jars);
logger.atFine().log("Loaded site libraries: %s", lazy(() -> jarList(jars)));
} catch (IOException e) {
logger.atSevere().withCause(e).log("Error scanning lib directory %s", libdir);
}
}
private static String jarList(List jars) {
return jars.stream().map(p -> p.getFileName().toString()).collect(joining(","));
}
public static List listJars(Path dir) throws IOException {
DirectoryStream.Filter filter =
new DirectoryStream.Filter() {
@Override
public boolean accept(Path entry) throws IOException {
String name = entry.getFileName().toString();
return (name.endsWith(".jar") || name.endsWith(".zip")) && Files.isRegularFile(entry);
}
};
try (DirectoryStream jars = Files.newDirectoryStream(dir, filter)) {
return new Ordering() {
@Override
public int compare(Path a, Path b) {
// Sort by reverse last-modified time so newer JARs are first.
return ComparisonChain.start()
.compare(lastModified(b), lastModified(a))
.compare(a, b)
.result();
}
}.sortedCopy(jars);
} catch (NoSuchFileException nsfe) {
return ImmutableList.of();
}
}
private SiteLibraryLoaderUtil() {}
}