com.datastax.oss.driver.internal.core.os.JnrLibcSubstitution Maven / Gradle / Ivy
/*
* Copyright DataStax, Inc.
*
* 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.datastax.oss.driver.internal.core.os;
import com.oracle.svm.core.annotate.Substitute;
import com.oracle.svm.core.annotate.TargetClass;
import java.util.Optional;
/**
* Add an explicit Graal substitution for {@link JnrLibc}. If we don't implement something like this
* the analysis done at Graal native image build time will discover the jnr-posix references in
* JnrLibc even though they won't be used at runtime. By default jnr-ffi (used by jnr-posix to do
* it's work) will use {@link ClassLoader#defineClass(String, byte[], int, int)} which isn't
* supported by Graal. This behaviour can be changed with a system property but the cleanest
* solution is simply to remove the references to jnr-posix code via a Graal substitution.
*/
@TargetClass(JnrLibc.class)
@Substitute
final class JnrLibcSubstitution implements Libc {
@Substitute
public JnrLibcSubstitution() {}
@Substitute
@Override
public boolean available() {
return false;
}
@Substitute
@Override
public Optional gettimeofday() {
return Optional.empty();
}
@Substitute
@Override
public Optional getpid() {
return Optional.empty();
}
}