Module jdk.jshell

Package jdk.jshell.spi

Interface ExecutionEnv

public interface ExecutionEnv

Functionality made available to a pluggable JShell execution engine. It is provided to the execution engine by the core JShell implementation.

This interface is designed to provide the access to core JShell functionality needed to implement ExecutionControl.

Since:

9

See Also:

• ExecutionControl

Method Summary

Modifier and Type	Method	Description
void	closeDown()	Reports that the execution engine has shutdown.
default Optional<JShellConsole>	console()	Returns the JShellConsole that should be used by the execution engine, or null if none.
List<String>	extraRemoteVMOptions()	Returns the additional VM options to be used when launching the remote JVM.
PrintStream	userErr()	Returns the user's error stream.
InputStream	userIn()	Returns the user's input stream.
PrintStream	userOut()	Returns the user's output stream.

Method Details

userIn

InputStream userIn()

Returns the user's input stream.

Returns:

the user's input stream

userOut

PrintStream userOut()

Returns the user's output stream.

Returns:

the user's output stream

userErr

PrintStream userErr()

Returns the user's error stream.

Returns:

the user's error stream

extraRemoteVMOptions

List<String> extraRemoteVMOptions()

Returns the additional VM options to be used when launching the remote JVM. This is advice to the execution engine.

Note: an execution engine need not launch a remote JVM.

Returns:

the additional options with which to launch the remote JVM

closeDown

void closeDown()

Reports that the execution engine has shutdown.

console

default Optional<JShellConsole> console()

Returns the JShellConsole that should be used by the execution engine, or null if none.

Note: an execution engine may not support JShellConsole.

Implementation Requirements:

The default implementation of this method returns an empty Optional.

Returns:

returns console, or an empty Optional if none, never null

Since:

21