jlibs.core.lang

Class RuntimeUtil

java.lang.Object

jlibs.core.lang.RuntimeUtil

public class RuntimeUtil
extends Object

The class contains Runtime related utilities

Author:

Santhosh Kumar T

Constructor Summary

Constructors

Constructor and Description
RuntimeUtil()

Method Summary

Modifier and Type	Method and Description
static void	gc() This method guarantees that garbage collection is done unlike System.gc()
static void	gc(int count) calls gc() count times
static void	gcOnExit() This method guarantees that garbage colleciton is done after JVM shutdown is initialized
static String	getPID() Returns the PID of the current process.
static void	redirectStreams(Process process, OutputStream output, OutputStream error) Redirects given process's input and error streams to the specified streams.
static String	runCommand(String command) Runs the specified command in terminal (sh in *nix/cmd in windows) and returns the command output.
static String	runCommand(String command, String[] envp, File workingDir) Runs the specified command in terminal (sh in *nix/cmd in windows) and returns the command output.

Methods inherited from class java.lang.Object

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

Constructor Detail

RuntimeUtil

public RuntimeUtil()

Method Detail

redirectStreams

public static void redirectStreams(Process process,
                                   OutputStream output,
                                   OutputStream error)

Redirects given process's input and error streams to the specified streams. the streams specified are not closed automatically. The streams passed can be null, if you don't want to redirect them.

Parameters:

process - process whose streams to be redirected

output - outputStream to which process's inputStream is redirected.
null if you don't want to redirect.

error - outputStream to which process's errorStream is redirected.
null if you don't want to redirect.

runCommand

public static String runCommand(String command,
                                String[] envp,
                                File workingDir)
                         throws IOException

Runs the specified command in terminal (sh in *nix/cmd in windows) and returns the command output.

Parameters:

command - complete command to be executed

envp - array of strings, each element of which has environment variable settings in the format name=value, or null if the subprocess should inherit the environment of the current process.

workingDir - the working directory of the subprocess, or null if the subprocess should inherit the working directory of the current process.

Returns:

output of the command.

Throws:

IOException - If an I/O error occurs

See Also:

runCommand(String)

runCommand

public static String runCommand(String command)
                         throws IOException

Runs the specified command in terminal (sh in *nix/cmd in windows) and returns the command output. The subprocess created inherits environment and working directory from the current process

Parameters:

command - complete command to be executed

Returns:

output of the command.

Throws:

IOException - If an I/O error occurs

See Also:

runCommand(String, String[], java.io.File)

getPID

public static String getPID()
                     throws IOException

Returns the PID of the current process. The PID will also be saved in system property "pid"

Returns:

PID of current progress

Throws:

IOException - If an I/O error occurs

gc

public static void gc()

This method guarantees that garbage collection is done unlike System.gc()

gc

public static void gc(int count)

calls gc() count times

gcOnExit

public static void gcOnExit()

This method guarantees that garbage colleciton is done after JVM shutdown is initialized