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/*
* Copyright (c) 2016 Cisco and/or its affiliates.
*
* 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 io.fd.vpp.jvpp;
import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.StandardCopyOption;
import java.nio.file.attribute.PosixFilePermission;
import java.nio.file.attribute.PosixFilePermissions;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Utility class for loading JNI libraries.
*/
public final class NativeLibraryLoader {
private static final Logger LOG = Logger.getLogger(NativeLibraryLoader.class.getName());
private NativeLibraryLoader() {
throw new UnsupportedOperationException("This utility class cannot be instantiated.");
}
/**
* Loads JNI library using class loader of the given class.
*
* @param libName name of the library to be loaded
*/
public static void loadLibrary(final String libName, final Class clazz) throws IOException {
java.util.Objects.requireNonNull(libName, "libName should not be null");
java.util.Objects.requireNonNull(clazz, "clazz should not be null");
try (final InputStream is = clazz.getResourceAsStream('/' + libName)) {
if (is == null) {
throw new IOException("Failed to open library resource " + libName);
}
loadStream(libName, is);
}
}
private static void loadStream(final String libName, final InputStream is) throws IOException {
final Set<PosixFilePermission> perms = PosixFilePermissions.fromString("rwxr-x---");
final Path p = Files.createTempFile(libName, null, PosixFilePermissions.asFileAttribute(perms));
try {
Files.copy(is, p, StandardCopyOption.REPLACE_EXISTING);
Runtime.getRuntime().load(p.toString());
} catch (Exception e) {
throw new IOException("Failed to load library " + p, e);
} finally {
try {
Files.deleteIfExists(p);
} catch (IOException e) {
LOG.log(Level.WARNING, String.format("Failed to delete temporary file %s.", p), e);
}
}
}
}
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