# 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`.

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`

  ### 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`
    Overrides:
      `varValue` in class `DirectExecutionControl`
    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`