com.datastax.oss.driver.internal.core.os.GraalLibc Maven / Gradle / Ivy
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/*
* 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 com.datastax.oss.driver.internal.core.os;
import java.util.Locale;
import java.util.Optional;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class GraalLibc implements Libc {
private static final Logger LOG = LoggerFactory.getLogger(GraalLibc.class);
private static final Locale LOCALE = Locale.ENGLISH;
private static final String MAC_PLATFORM_STR = "mac".toLowerCase(LOCALE);
private static final String DARWIN_PLATFORM_STR = "darwin".toLowerCase(LOCALE);
private static final String LINUX_PLATFORM_STR = "linux".toLowerCase(LOCALE);
private final boolean available = checkAvailability();
/* This method is adapted from of jnr.ffi.Platform.determineOS() in jnr-ffi version 2.1.10. **/
private boolean checkPlatform() {
String osName = System.getProperty("os.name").split(" ", -1)[0];
String compareStr = osName.toLowerCase(Locale.ENGLISH);
return compareStr.startsWith(MAC_PLATFORM_STR)
|| compareStr.startsWith(DARWIN_PLATFORM_STR)
|| compareStr.startsWith(LINUX_PLATFORM_STR);
}
private boolean checkAvailability() {
if (!checkPlatform()) {
return false;
}
try {
getpidRaw();
} catch (Throwable t) {
LOG.debug("Error calling getpid()", t);
return false;
}
try {
gettimeofdayRaw();
} catch (Throwable t) {
LOG.debug("Error calling gettimeofday()", t);
return false;
}
return true;
}
@Override
public boolean available() {
return this.available;
}
/* Substrate includes a substitution for Linux + Darwin which redefines System.nanoTime() to use
* gettimeofday() (unless platform-specific higher-res clocks are available, which is even better). */
@Override
public Optional gettimeofday() {
return this.available ? Optional.of(gettimeofdayRaw()) : Optional.empty();
}
private long gettimeofdayRaw() {
return Math.round(System.nanoTime() / 1_000d);
}
@Override
public Optional getpid() {
return this.available ? Optional.of(getpidRaw()) : Optional.empty();
}
private int getpidRaw() {
return GraalGetpid.getpid();
}
}