Module jdk.jshell

Package jdk.jshell.execution

Class RemoteExecutionControl

java.lang.Object

jdk.jshell.execution.DirectExecutionControl

jdk.jshell.execution.RemoteExecutionControl

All Implemented Interfaces:

AutoCloseable, ExecutionControl

public class RemoteExecutionControl
extends DirectExecutionControl
implements ExecutionControl

The remote agent runs in the execution process (separate from the main JShell process). This agent loads code over a socket from the main JShell process, executes the code, and other misc, Specialization of DirectExecutionControl which adds stop support controlled by an external process. Designed to work with JdiDefaultExecutionControl.

The initial handshake with JdiDefaultExecutionControl is as follows: the first command line argument is -1. The port number to which the agent should connect is passed on the first line on stdin. On the second line of stdin, an Base64-encoded byte array is sent, which should be sent to the socket immediately after the connection is established.

Since:

9

Nested Class Summary

Nested classes/interfaces declared in interface jdk.jshell.spi.ExecutionControl

ExecutionControl.ClassBytecodes, ExecutionControl.ClassInstallException, ExecutionControl.EngineTerminationException, ExecutionControl.ExecutionControlException, ExecutionControl.InternalException, ExecutionControl.NotImplementedException, ExecutionControl.ResolutionException, ExecutionControl.RunException, ExecutionControl.StoppedException, ExecutionControl.UserException

Constructor Summary

Constructors

Constructor	Description
RemoteExecutionControl()	Create an instance using the default class loading.
RemoteExecutionControl(LoaderDelegate loaderDelegate)	Creates an instance, delegating loader operations to the specified delegate.

Method Summary

Modifier and Type	Method	Description
protected void	clientCodeEnter()	Marks entry into user code.
static void	main(String[] args)	Launch the agent, connecting to the JShell-core over the socket specified in the command-line argument.
void	redefine(ExecutionControl.ClassBytecodes[] cbcs)	Redefine processing on the remote end is only to register the redefined classes
void	stop()	Interrupts a running invoke.
String	varValue(String className, String varName)	Returns the value of a variable.

Methods declared in class jdk.jshell.execution.DirectExecutionControl

addToClasspath, classesRedefined, clientCodeLeave, close, extensionCommand, findClass, invoke, invoke, load, stop, throwConvertedInvocationException, throwConvertedOtherException, valueString, varValue

Methods declared in class java.lang.Object

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

Methods declared in interface jdk.jshell.spi.ExecutionControl

addToClasspath, close, extensionCommand, invoke, load

Constructor Details

RemoteExecutionControl

public RemoteExecutionControl(LoaderDelegate loaderDelegate)

Creates an instance, delegating loader operations to the specified delegate.

Parameters:

loaderDelegate - the delegate to handle loading classes

RemoteExecutionControl

public RemoteExecutionControl()

Create an instance using the default class loading.

Method Details

main

public static void main(String[] args)
                 throws Exception

Launch the agent, connecting to the JShell-core over the socket specified in the command-line argument.

Parameters:

args - standard command-line arguments, expectation is the socket number is the only argument

Throws:

Exception - any unexpected exception

redefine

public void redefine(ExecutionControl.ClassBytecodes[] cbcs)
              throws ExecutionControl.ClassInstallException,
ExecutionControl.NotImplementedException,
ExecutionControl.EngineTerminationException

Redefine processing on the remote end is only to register the redefined classes

Specified by:

redefine in interface ExecutionControl

Parameters:

cbcs - the class name and bytecodes to redefine

Throws:

ExecutionControl.ClassInstallException - exception occurred redefining the classes, some or all were not redefined

ExecutionControl.NotImplementedException - if not implemented

ExecutionControl.EngineTerminationException - the execution engine has terminated

stop

public void stop()
          throws ExecutionControl.EngineTerminationException,
ExecutionControl.InternalException

Description copied from class: DirectExecutionControl

Interrupts a running invoke.

Not supported.

Specified by:

stop in interface ExecutionControl

Overrides:

stop in class DirectExecutionControl

Throws:

ExecutionControl.EngineTerminationException - the execution engine has terminated

ExecutionControl.InternalException - an internal problem occurred

varValue

public String varValue(String className,
 String varName)
                throws ExecutionControl.RunException,
ExecutionControl.EngineTerminationException,
ExecutionControl.InternalException

Description copied from interface: ExecutionControl

Returns the value of a variable.

Specified by:

varValue in interface ExecutionControl

Parameters:

className - the name of the wrapper class of the variable

varName - the name of the variable

Returns:

the value of the variable

Throws:

ExecutionControl.UserException - formatting the value raised a user exception

ExecutionControl.ResolutionException - formatting the value attempted to directly or indirectly invoke an unresolved snippet

ExecutionControl.StoppedException - if the formatting the value was canceled by ExecutionControl.stop()

ExecutionControl.EngineTerminationException - the execution engine has terminated

ExecutionControl.InternalException - an internal problem occurred

ExecutionControl.RunException

clientCodeEnter

protected void clientCodeEnter()

Description copied from class: DirectExecutionControl

Marks entry into user code.

Overrides:

clientCodeEnter in class DirectExecutionControl