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// Copyright 2016 The Bazel Authors. All rights reserved.
//
// 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 com.google.devtools.build.lib.windows.jni;
import com.google.devtools.build.lib.windows.runfiles.WindowsRunfiles;
import java.io.IOException;
/** Loads native code under Windows. */
public class WindowsJniLoader {
private static boolean jniLoaded = false;
public static synchronized void loadJni() {
if (jniLoaded) {
return;
}
try {
System.loadLibrary("windows_jni");
} catch (UnsatisfiedLinkError ex) {
// Try to find the library in the runfiles.
if (!loadFromRunfileOrThrow("io_bazel/src/main/native/windows/windows_jni.dll", ex)) {
if (!loadFromRunfileOrThrow(
"io_bazel/external/bazel_tools/src/main/native/windows/windows_jni.dll", ex)) {
// We throw the UnsatisfiedLinkError if we cannot find the DLL under any known location.
throw ex;
}
}
}
jniLoaded = true;
}
private static boolean loadFromRunfileOrThrow(String runfile, UnsatisfiedLinkError ex) {
// Try to find the library in the runfiles.
String path;
try {
path = WindowsRunfiles.getRunfile(runfile);
if (path == null) {
// Just return false if the runfile path was not found. Maybe it's under a different path.
return false;
}
System.load(path);
return true;
} catch (IOException e) {
// We throw the UnsatisfiedLinkError if we cannot find the runfiles
throw ex;
}
}
}
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