net.openhft.chronicle.core.OS Maven / Gradle / Ivy
/*
* Copyright 2016 higherfrequencytrading.com
*
* 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 net.openhft.chronicle.core;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import sun.nio.ch.FileChannelImpl;
import java.io.*;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.nio.channels.FileChannel;
import java.util.Random;
import java.util.Scanner;
import static java.lang.management.ManagementFactory.getRuntimeMXBean;
/**
* Low level axcess to OS class.
*/
public enum OS {
;
public static final String TMP = System.getProperty("java.io.tmpdir");
public static final String TARGET = System.getProperty("project.build.directory", findTarget());
private static final String HOST_NAME = getHostName0();
private static final String USER_NAME = System.getProperty("user.name");
private static final Logger LOG = LoggerFactory.getLogger(OS.class);
private static final int MAP_RO = 0;
private static final int MAP_RW = 1;
private static final int MAP_PV = 2;
private static final boolean IS64BIT = is64Bit0();
private static final int PROCESS_ID = getProcessId0();
private static final Memory MEMORY = getMemory();
private static final String OS = System.getProperty("os.name").toLowerCase();
private static final boolean IS_LINUX = OS.startsWith("linux");
private static final boolean IS_MAC = OS.contains("mac");
private static final boolean IS_WIN = OS.startsWith("win");
private static final boolean IS_WIN10 = OS.equals("windows 10");
private static final int MAP_ALIGNMENT = isWindows() ? 64 << 10 : pageSize();
private static final Method UNMAPP0;
/**
* Unmap a region of memory.
*
* @param address of the start of the mapping.
* @param size of the region mapped.
* @throws IOException if the unmap fails.
*/
static {
try {
UNMAPP0 = FileChannelImpl.class.getDeclaredMethod("unmap0", long.class, long.class);
UNMAPP0.setAccessible(true);
} catch (NoSuchMethodException e) {
throw new AssertionError(e);
}
}
private static String findTarget() {
for (File dir = new File(System.getProperty("user.dir")); dir != null; dir = dir.getParentFile()) {
File target = new File(dir, "target");
if (target.exists())
return target.getAbsolutePath();
}
return TMP + "/target";
}
public static String getHostName() {
return HOST_NAME;
}
public static String getUserName() {
return USER_NAME;
}
public static String getTarget() {
return TARGET;
}
private static String getHostName0() {
try {
return InetAddress.getLocalHost().getHostName();
} catch (UnknownHostException e) {
return "localhost";
}
}
private static Memory getMemory() {
Memory memory = null;
try {
Class java9MemoryClass = Class
.forName("software.chronicle.enterprise.core.Java9Memory")
.asSubclass(Memory.class);
Method create = java9MemoryClass.getMethod("create");
memory = (Memory) create.invoke(null);
} catch (ClassNotFoundException expected) {
// expected
} catch (NoSuchMethodException | InvocationTargetException
| IllegalAccessException | IllegalArgumentException e) {
LOG.warn("Unable to load Java9MemoryClass", e);
}
if (memory == null)
memory = UnsafeMemory.INSTANCE;
return memory;
}
/**
* @return native memory accessor class
*/
public static Memory memory() {
return MEMORY;
}
/**
* Align the size to page boundary
*
* @param size the size to align
* @return aligned size
* @see #pageSize()
*/
public static long pageAlign(long size) {
long mask = pageSize() - 1;
return (size + mask) & ~mask;
}
/**
* @return size of pages
* @see #pageAlign(long)
*/
public static int pageSize() {
return memory().pageSize();
}
/**
* Align an offset of a memory mapping in file based on OS.
*
* @param offset to align
* @return offset aligned
* @see #mapAlignment()
*/
public static long mapAlign(long offset) {
int chunkMultiple = MAP_ALIGNMENT;
return (offset + chunkMultiple - 1) / chunkMultiple * chunkMultiple;
}
/**
* Returns the alignment of offsets in file, from which memory mapping could start, based on
* OS.
*
* @return granularity of an offset in a file
* @see #mapAlign(long)
*/
public static long mapAlignment() {
return MAP_ALIGNMENT;
}
/**
* @return is the JVM 64-bit
*/
public static boolean is64Bit() {
return IS64BIT;
}
private static boolean is64Bit0() {
String systemProp;
systemProp = System.getProperty("com.ibm.vm.bitmode");
if (systemProp != null) {
return "64".equals(systemProp);
}
systemProp = System.getProperty("sun.arch.data.model");
if (systemProp != null) {
return "64".equals(systemProp);
}
systemProp = System.getProperty("java.vm.version");
return systemProp != null && systemProp.contains("_64");
}
public static int getProcessId() {
return PROCESS_ID;
}
private static int getProcessId0() throws NumberFormatException {
String pid = null;
final File self = new File("/proc/self");
try {
if (self.exists())
pid = self.getCanonicalFile().getName();
} catch (IOException ignored) {
// ignored
}
if (pid == null)
pid = getRuntimeMXBean().getName().split("@", 0)[0];
if (pid == null) {
int rpid = new Random().nextInt(1 << 16);
LOG.warn("Unable to determine PID, picked a random number=" + rpid);
return rpid;
} else {
return Integer.parseInt(pid);
}
}
/**
* This may or may not be the OS thread id, but should be unique across processes
*
* @return a unique tid of up to 48 bits.
*/
/* public static long getUniqueTid() {
return getUniqueTid(Thread.currentThread());
}
public static long getUniqueTid(Thread thread) {
// Assume 48 bit for 16 to 24-bit process id and 16 million threads from the start.
return ((long) getProcessId() << 24) | thread.getId();
}*/
public static boolean isWindows() {
return IS_WIN;
}
public static boolean isMacOSX() {
return IS_MAC;
}
public static boolean isLinux() {
return IS_LINUX;
}
/**
* @return the maximum PID.
*/
public static long getPidMax() throws NumberFormatException {
if (isLinux()) {
File file = new File("/proc/sys/kernel/pid_max");
if (file.canRead())
try {
return Maths.nextPower2(new Scanner(file).nextLong(), 1);
} catch (FileNotFoundException e) {
LOG.warn("", e);
}
} else if (isMacOSX()) {
return 1L << 24;
}
// the default.
return IS_WIN10 ? 1L << 32 : 1L << 16;
}
/**
* Map a region of a file into memory.
*
* @param fileChannel to map
* @param mode of access
* @param start offset within a file
* @param size of region to map.
* @return the address of the memory mapping.
* @throws IOException if the mapping fails
* @throws IllegalArgumentException if the arguments are not valid
*/
public static long map(FileChannel fileChannel, FileChannel.MapMode mode, long start, long size)
throws IOException, IllegalArgumentException {
if (isWindows() && size > 4L << 30)
throw new IllegalArgumentException("Mapping more than 4096 MiB is unusable on Windows, size = " + (size >> 20) + " MiB");
try {
return map0(fileChannel, imodeFor(mode), mapAlign(start), pageAlign(size));
} catch (NoSuchMethodException | IllegalAccessException e) {
throw new AssertionError(e);
} catch (InvocationTargetException e) {
throw asAnIOException(e);
}
}
static long map0(FileChannel fileChannel, int imode, long start, long size)
throws NoSuchMethodException, IllegalAccessException, InvocationTargetException, IllegalArgumentException {
Method map0 = fileChannel.getClass().getDeclaredMethod("map0", int.class, long.class, long.class);
map0.setAccessible(true);
return (Long) map0.invoke(fileChannel, imode, start, size);
}
public static void unmap(long address, long size) throws IOException {
try {
UNMAPP0.invoke(null, address, pageAlign(size));
} catch (Exception e) {
throw asAnIOException(e);
}
}
private static IOException asAnIOException(Throwable e) {
if (e instanceof InvocationTargetException)
e = e.getCause();
if (e instanceof IOException)
return (IOException) e;
return new IOException(e);
}
static int imodeFor(FileChannel.MapMode mode) {
int imode = -1;
if (FileChannel.MapMode.READ_ONLY.equals(mode))
imode = MAP_RO;
else if (FileChannel.MapMode.READ_WRITE.equals(mode))
imode = MAP_RW;
else if (FileChannel.MapMode.PRIVATE.equals(mode))
imode = MAP_PV;
assert (imode >= 0);
return imode;
}
/**
* Get the sapce actually used by a file.
*
* @param filename to get the actual size of
* @return size in bytes.
*/
public static long spaceUsed(String filename) {
return spaceUsed(new File(filename));
}
private static long spaceUsed(File file) throws NumberFormatException {
if (!isWindows()) {
try {
String du_k = run("du", "-ks", file.getAbsolutePath());
return Long.parseLong(du_k.substring(0, du_k.indexOf('\t')));
} catch (IOException e) {
LOG.error("", e);
}
}
return file.length();
}
private static String run(String... cmds) throws IOException {
ProcessBuilder pb = new ProcessBuilder(cmds);
pb.redirectErrorStream(true);
Process process = pb.start();
StringWriter sw = new StringWriter();
char[] chars = new char[1024];
try (Reader r = new InputStreamReader(process.getInputStream())) {
for (int len; (len = r.read(chars)) > 0; ) {
sw.write(chars, 0, len);
}
}
return sw.toString();
}
public static class Unmapper implements Runnable {
private final long size;
private final ReferenceCounted owner;
private volatile long address;
public Unmapper(long address, long size, ReferenceCounted owner) throws IllegalStateException {
owner.reserve();
this.owner = owner;
assert (address != 0);
this.address = address;
this.size = size;
}
public void run() {
if (address == 0)
return;
try {
unmap(address, size);
address = 0;
owner.release();
} catch (IOException | IllegalStateException e) {
LOG.error("Error on unmap and release", e);
}
}
}
}
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