nl.topicus.jdbc.shaded.io.netty.internal.tcnative.Library Maven / Gradle / Ivy
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JDBC Driver for Google Cloud Spanner
/*
* Copyright 2016 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.
*/
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF 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 nl.topicus.jdbc.shaded.io.netty.internal.tcnative;
import java.io.File;
public final class Library {
/* Default library names */
private static final String [] NAMES = {
"netty_tcnative",
"libnetty_tcnative"
};
private static final String PROVIDED = "provided";
/*
* A handle to the unique Library singleton instance.
*/
private static Library _instance = null;
private Library() throws Exception {
boolean loaded = false;
String path = System.getProperty("java.library.path");
String [] paths = path.split(File.pathSeparator);
StringBuilder err = new StringBuilder();
for (int i = 0; i < NAMES.length; i++) {
try {
loadLibrary(NAMES[i]);
loaded = true;
} catch (ThreadDeath t) {
throw t;
} catch (VirtualMachineError t) {
throw t;
} catch (Throwable t) {
String name = System.mapLibraryName(NAMES[i]);
for (int j = 0; j < paths.length; j++) {
File fd = new File(paths[j] , name);
if (fd.exists()) {
// File exists but failed to load
throw new RuntimeException(t);
}
}
if (i > 0) {
err.append(", ");
}
err.append(t.getMessage());
}
if (loaded) {
break;
}
}
if (!loaded) {
throw new UnsatisfiedLinkError(err.toString());
}
}
private Library(String libraryName) {
if (!PROVIDED.equals(libraryName)) {
loadLibrary(libraryName);
}
}
private static void loadLibrary(String libraryName) {
System.loadLibrary(calculatePackagePrefix().replace('.', '_') + libraryName);
}
/**
* The shading prefix added to this class's full name.
*
* @throws UnsatisfiedLinkError if the shader used something other than a prefix
*/
private static String calculatePackagePrefix() {
String maybeShaded = Library.class.getName();
// Use ! instead of . to avoid shading utilities from modifying the string
String expected = "nl.topicus.jdbc.shaded.io.netty!internal!tcnative!Library".replace('!', '.');
if (!maybeShaded.endsWith(expected)) {
throw new UnsatisfiedLinkError(String.format(
"Could not find prefix added to %s to get %s. When shading, only adding a "
+ "package prefix is supported", expected, maybeShaded));
}
return maybeShaded.substring(0, maybeShaded.length() - expected.length());
}
/* create global TCN's APR pool
* This has to be the first call to TCN library.
*/
private static native boolean initialize0();
private static native boolean aprHasThreads();
private static native int aprMajorVersion();
/* APR_VERSION_STRING */
private static native String aprVersionString();
/**
* Calls {@link #initialize(String, String)} with {@code "provided"} and {@code null}.
*
* @return {@code true} if initialization was successful
* @throws Exception if an error happens during initialization
*/
public static boolean initialize() throws Exception {
return initialize(PROVIDED, null);
}
/**
* Setup native library. This is the first method that must be called!
*
* @param libraryName the name of the library to load
* @param engine Support for external a Crypto Device ("engine"), usually
* @return {@code true} if initialization was successful
* @throws Exception if an error happens during initialization
*/
public static boolean initialize(String libraryName, String engine) throws Exception {
if (_instance == null) {
_instance = libraryName == null ? new Library() : new Library(libraryName);
if (aprMajorVersion() < 1) {
throw new UnsatisfiedLinkError("Unsupported APR Version (" +
aprVersionString() + ")");
}
if (!aprHasThreads()) {
throw new UnsatisfiedLinkError("Missing APR_HAS_THREADS");
}
}
return initialize0() && SSL.initialize(engine) == 0;
}
}