org.scijava.nativelib.WebappJniExtractor Maven / Gradle / Ivy
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/*
* #%L
* Native library loader for extracting and loading native libraries from Java.
* %%
* Copyright (C) 2010 - 2015 Board of Regents of the University of
* Wisconsin-Madison and Glencoe Software, Inc.
* %%
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
* #L%
*/
// This code is derived from Richard van der Hoff's mx-native-loader project:
// http://opensource.mxtelecom.com/maven/repo/com/wapmx/native/mx-native-loader/1.7/
// See NOTICE.txt for details.
// Copyright 2009 MX Telecom Ltd
package org.scijava.nativelib;
import java.io.File;
import java.io.IOException;
/**
* JniExtractor suitable for multiple application deployments on the same
* virtual machine (such as webapps)
*
* Designed to avoid the restriction that jni library can be loaded by at most
* one classloader at a time.
*
* Works by extracting each library to a different location for each
* classloader.
*
* WARNING: This can expose strange and wonderful bugs in jni code. These bugs
* generally stem from transitive dependencies of the jni library and can be
* solved by linking these dependencies statically to form a single library
*
* @author markjh
*/
public class WebappJniExtractor extends BaseJniExtractor {
private final File nativeDir;
private final File jniSubDir;
/**
* @param classloaderName is a friendly name for your classloader which will
* be embedded in the directory name of the classloader-specific
* subdirectory which will be created.
*/
public WebappJniExtractor(final String classloaderName) throws IOException {
nativeDir = new File(System.getProperty("java.library.tmpdir", "tmplib"));
// Order of operations is such thatwe do not error if we are racing with
// another thread to create the directory.
nativeDir.mkdirs();
if (!nativeDir.isDirectory()) {
throw new IOException(
"Unable to create native library working directory " + nativeDir);
}
final long now = System.currentTimeMillis();
File trialJniSubDir;
int attempt = 0;
while (true) {
trialJniSubDir =
new File(nativeDir, classloaderName + "." + now + "." + attempt);
if (trialJniSubDir.mkdir()) break;
if (trialJniSubDir.exists()) {
attempt++;
continue;
}
throw new IOException(
"Unable to create native library working directory " + trialJniSubDir);
}
jniSubDir = trialJniSubDir;
jniSubDir.deleteOnExit();
}
@Override
protected void finalize() throws Throwable {
super.finalize();
final File[] files = jniSubDir.listFiles();
for (final File file : files) {
file.delete();
}
jniSubDir.delete();
}
@Override
public File getJniDir() {
return jniSubDir;
}
@Override
public File getNativeDir() {
return nativeDir;
}
}