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The Netty project is an effort to provide an asynchronous event-driven network application framework and tools for rapid development of maintainable high performance and high scalability protocol servers and clients. In other words, Netty is a NIO client server framework which enables quick and easy development of network applications such as protocol servers and clients. It greatly simplifies and streamlines network programming such as TCP and UDP socket server.
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/*
 * Copyright 2014 The Netty Project
 *
 * The Netty Project licenses this file to you 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 org.jboss.netty.util.internal;

import org.jboss.netty.logging.InternalLogger;
import org.jboss.netty.logging.InternalLoggerFactory;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;
import java.util.Locale;

/**
 * Helper class to load JNI resources.
 *
 */
public final class NativeLibraryLoader {

    private static final InternalLogger logger = InternalLoggerFactory.getInstance(NativeLibraryLoader.class);

    private static final String NATIVE_RESOURCE_HOME = "META-INF/native/";
    private static final String OSNAME;
    private static final File WORKDIR;

    static {
        OSNAME = SystemPropertyUtil.get("os.name", "").toLowerCase(Locale.US).replaceAll("[^a-z0-9]+", "");

        String workdir = SystemPropertyUtil.get("io.netty.native.workdir");
        if (workdir != null) {
            File f = new File(workdir);
            if (!f.exists()) {
                // ok to ignore as createTempFile will take care
                //noinspection ResultOfMethodCallIgnored
                f.mkdirs();
            }

            try {
                f = f.getAbsoluteFile();
            } catch (Exception ignored) {
                // Good to have an absolute path, but it's OK.
            }

            WORKDIR = f;
            logger.debug("-Dio.netty.netty.workdir: " + WORKDIR);
        } else {
            WORKDIR = tmpdir();
            logger.debug("-Dio.netty.netty.workdir: " + WORKDIR + " (io.netty.tmpdir)");
        }
    }

    private static File tmpdir() {
        File f;
        try {
            f = toDirectory(SystemPropertyUtil.get("io.netty.tmpdir"));
            if (f != null) {
                logger.debug("-Dio.netty.tmpdir: " + f);
                return f;
            }

            f = toDirectory(SystemPropertyUtil.get("java.io.tmpdir"));
            if (f != null) {
                logger.debug("-Dio.netty.tmpdir: " + f + " (java.io.tmpdir)");
                return f;
            }

            // This shouldn't happen, but just in case ..
            if (isWindows()) {
                f = toDirectory(System.getenv("TEMP"));
                if (f != null) {
                    logger.debug("-Dio.netty.tmpdir: " + f + " (%TEMP%)");
                    return f;
                }

                String userprofile = System.getenv("USERPROFILE");
                if (userprofile != null) {
                    f = toDirectory(userprofile + "\\AppData\\Local\\Temp");
                    if (f != null) {
                        logger.debug("-Dio.netty.tmpdir: " + f + " (%USERPROFILE%\\AppData\\Local\\Temp)");
                        return f;
                    }

                    f = toDirectory(userprofile + "\\Local Settings\\Temp");
                    if (f != null) {
                        logger.debug("-Dio.netty.tmpdir: " + f + " (%USERPROFILE%\\Local Settings\\Temp)");
                        return f;
                    }
                }
            } else {
                f = toDirectory(System.getenv("TMPDIR"));
                if (f != null) {
                    logger.debug("-Dio.netty.tmpdir: " + f + " ($TMPDIR)");
                    return f;
                }
            }
        } catch (Exception ignored) {
            // Environment variable inaccessible
        }

        // Last resort.
        if (isWindows()) {
            f = new File("C:\\Windows\\Temp");
        } else {
            f = new File("/tmp");
        }

        logger.warn("Failed to get the temporary directory; falling back to: " + f);
        return f;
    }

    @SuppressWarnings("ResultOfMethodCallIgnored")
    private static File toDirectory(String path) {
        if (path == null) {
            return null;
        }

        File f = new File(path);
        if (!f.exists()) {
            f.mkdirs();
        }

        if (!f.isDirectory()) {
            return null;
        }

        try {
            return f.getAbsoluteFile();
        } catch (Exception ignored) {
            return f;
        }
    }

    private static boolean isWindows() {
        return OSNAME.startsWith("windows");
    }

    private static boolean isOSX() {
        return OSNAME.startsWith("macosx") || OSNAME.startsWith("osx");
    }

    /**
     * Load the given library with the specified {@link java.lang.ClassLoader}
     */
    public static void load(String name, ClassLoader loader) {
        String libname = System.mapLibraryName(name);
        String path = NATIVE_RESOURCE_HOME + libname;

        URL url = loader.getResource(path);
        if (url == null && isOSX()) {
            if (path.endsWith(".jnilib")) {
                url = loader.getResource(NATIVE_RESOURCE_HOME + "lib" + name + ".dynlib");
            } else {
                url = loader.getResource(NATIVE_RESOURCE_HOME + "lib" + name + ".jnilib");
            }
        }

        if (url == null) {
            // Fall back to normal loading of JNI stuff
            System.loadLibrary(name);
            return;
        }

        int index = libname.lastIndexOf('.');
        String prefix = libname.substring(0, index);
        String suffix = libname.substring(index, libname.length());
        InputStream in = null;
        OutputStream out = null;
        File tmpFile = null;
        boolean loaded = false;
        try {
            tmpFile = File.createTempFile(prefix, suffix, WORKDIR);
            in = url.openStream();
            out = new FileOutputStream(tmpFile);

            byte[] buffer = new byte[8192];
            int length;
            while ((length = in.read(buffer)) > 0) {
                out.write(buffer, 0, length);
            }
            out.flush();
            out.close();
            out = null;

            System.load(tmpFile.getPath());
            loaded = true;
        } catch (Exception e) {
            throw (UnsatisfiedLinkError) new UnsatisfiedLinkError(
                    "could not load a native library: " + name).initCause(e);
        } finally {
            if (in != null) {
                try {
                    in.close();
                } catch (IOException ignore) {
                    // ignore
                }
            }
            if (out != null) {
                try {
                    out.close();
                } catch (IOException ignore) {
                    // ignore
                }
            }
            if (tmpFile != null) {
                if (loaded) {
                    tmpFile.deleteOnExit();
                } else {
                    if (!tmpFile.delete()) {
                        tmpFile.deleteOnExit();
                    }
                }
            }
        }
    }

    private NativeLibraryLoader() {
        // Utility
    }
}