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package com.diozero.util;
/*
* #%L
* Organisation: diozero
* Project: Device I/O Zero - Core
* Filename: LibraryLoader.java
*
* This file is part of the diozero project. More information about this project
* can be found at http://www.diozero.com/
* %%
* Copyright (C) 2016 - 2020 diozero
* %%
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
* #L%
*/
import java.io.InputStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.StandardCopyOption;
import java.util.HashMap;
import java.util.Map;
import org.tinylog.Logger;
public class LibraryLoader {
private static final Map LOADED_LIBRARIES = new HashMap<>();
private static final String LIBRARY_EXTENSION = System.getProperty("os.name").startsWith("Windows") ? ".dll"
: ".so";
public static void loadLibrary(Class clz, String libName) throws UnsatisfiedLinkError {
loadLibrary(clz, libName, true);
}
public static void loadLibrary(Class clz, String libName, boolean boardSpecific) throws UnsatisfiedLinkError {
synchronized (LOADED_LIBRARIES) {
if (LOADED_LIBRARIES.get(libName) == null) {
boolean loaded = false;
// First try load the library from within the JAR file
String lib_file;
if (boardSpecific) {
lib_file = String.format("/lib/%s/lib%s%s",
DeviceFactoryHelper.getNativeDeviceFactory().getBoardInfo().getLibraryPath(), libName,
LIBRARY_EXTENSION);
} else {
lib_file = String.format("/lib/lib%s%s", libName, LIBRARY_EXTENSION);
}
Logger.debug("Looking for lib '" + lib_file + "' on classpath");
try (InputStream is = clz.getResourceAsStream(lib_file)) {
Path path = Files.createTempFile("lib" + libName, LIBRARY_EXTENSION);
path.toFile().deleteOnExit();
Files.copy(is, path, StandardCopyOption.REPLACE_EXISTING);
Runtime.getRuntime().load(path.toString());
loaded = true;
Logger.debug("Loaded library '{}' from classpath", libName);
} catch (Throwable t) {
Logger.warn("Error loading library '{}' from classpath, trying System.loadLibrary: {}", libName, t);
}
if (!loaded) {
// Try load from the Java system library path (-Djava.library.path)
Logger.debug("Looking for lib '" + libName + "' on library path");
try {
System.loadLibrary(libName);
loaded = true;
Logger.info("Loaded library '{}' from system library path", libName);
} catch (Throwable t) {
Logger.error("Error loading library '{}' from system library path: {}", libName, t);
}
}
LOADED_LIBRARIES.put(libName, Boolean.valueOf(loaded));
}
}
}
}
