Package com.linecorp.armeria.common.util

Class SystemInfo

java.lang.Object

com.linecorp.armeria.common.util.SystemInfo

public final class SystemInfo
extends Object

Provides utilities for accessing the information about the current system and process.

Method Summary

Modifier and Type	Method	Description
static long	currentTimeMicros()	Returns the number of microseconds since the epoch (00:00:00, 01-Jan-1970, GMT).
static @Nullable Inet4Address	defaultNonLoopbackIpV4Address()	Returns the non-loopback Inet4Address whose NetworkInterface.getIndex() is the lowest.
static boolean	hasIpV6()	Returns true if the system has at least one working IPv6 network interface and the java.net.preferIPv4Stack system property is not enabled.
static String	hostname()	Returns the local hostname.
static boolean	isLinux()	Returns true if the operating system is Linux.
static int	javaVersion()	Returns the major version of the current Java Virtual Machine.
static boolean	jettyAlpnOptionalOrAvailable()	Whether the environment either supports ALPN natively or includes Jetty ALPN.
static OsType	osType()	Returns the operating system for the currently running process.
static int	pid()	Returns the current process ID.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Details

javaVersion

public static int javaVersion()

Returns the major version of the current Java Virtual Machine.

hostname

public static String hostname()

Returns the local hostname.

jettyAlpnOptionalOrAvailable

public static boolean jettyAlpnOptionalOrAvailable()

Whether the environment either supports ALPN natively or includes Jetty ALPN.

pid

public static int pid()

Returns the current process ID.

Throws:

IllegalStateException - if failed to retrieve the current process ID.

hasIpV6

public static boolean hasIpV6()

Returns true if the system has at least one working IPv6 network interface and the java.net.preferIPv4Stack system property is not enabled.

See Also:

• NetUtil.isIpV4StackPreferred()

defaultNonLoopbackIpV4Address

@Nullable
public static @Nullable Inet4Address defaultNonLoopbackIpV4Address()

Returns the non-loopback Inet4Address whose NetworkInterface.getIndex() is the lowest.

See Also:

• Flags.preferredIpV4Addresses()

currentTimeMicros

public static long currentTimeMicros()

Returns the number of microseconds since the epoch (00:00:00, 01-Jan-1970, GMT). The precision of the returned value may vary depending on Java version. Currently, Java 9 or above is required for microsecond precision. System.currentTimeMillis() * 1000 is returned on Java 8.

osType

public static OsType osType()

Returns the operating system for the currently running process.

isLinux

public static boolean isLinux()

Returns true if the operating system is Linux.