All Superinterfaces:: AutoCloseable

All Known Implementing Classes:: DirectExecutionControl, JdiDefaultExecutionControl, JdiExecutionControl, LocalExecutionControl, RemoteExecutionControl, StreamingExecutionControl

public interface ExecutionControl
extends AutoCloseable

This interface specifies the functionality that must provided to implement a pluggable JShell execution engine.

The audience for this Service Provider Interface is engineers wishing to implement their own version of the execution engine in support of the JShell API.

A Snippet is compiled into code wrapped in a 'wrapper class'. The execution engine is used by the core JShell implementation to load and, for executable Snippets, execute the Snippet.

Methods defined in this interface should only be called by the core JShell implementation.

Since:: 9

Nested Class Summary

Nested Classes
Modifier and Type	Interface	Description
`static class`	`ExecutionControl.ClassBytecodes`	Bundles class name with class bytecodes.
`static class`	`ExecutionControl.ClassInstallException`	A class install (load or redefine) encountered a problem.
`static class`	`ExecutionControl.EngineTerminationException`	Unbidden execution engine termination has occurred.
`static class`	`ExecutionControl.ExecutionControlException`	The abstract base of all `ExecutionControl` exceptions.
`static class`	`ExecutionControl.InternalException`	An internal problem has occurred.
`static class`	`ExecutionControl.NotImplementedException`	The command is not implemented.
`static class`	`ExecutionControl.ResolutionException`	An exception indicating that a `DeclarationSnippet` with unresolved references has been encountered.
`static class`	`ExecutionControl.RunException`	The abstract base of of exceptions specific to running user code.
`static class`	`ExecutionControl.StoppedException`	An exception indicating that an `invoke(java.lang.String, java.lang.String)` (or theoretically a `varValue(java.lang.String, java.lang.String)`) has been interrupted by a `stop()`.
`static class`	`ExecutionControl.UserException`	A 'normal' user exception occurred.

Method Summary

Modifier and Type	Method	Description
`void`	`addToClasspath(String path)`	Adds the path to the execution class path.
`void`	`close()`	Shuts down this execution engine.
`Object`	`extensionCommand(String command, Object arg)`	Run a non-standard command (or a standard command from a newer version).
`static ExecutionControl`	`generate(ExecutionEnv env, String spec)`	Search for a provider, then create and return the `ExecutionControl` instance.
`static ExecutionControl`	`generate(ExecutionEnv env, String name, Map<String,String> parameters)`	Search for a provider, then create and return the `ExecutionControl` instance.
`String`	`invoke(String className, String methodName)`	Invokes an executable Snippet by calling a method on the specified wrapper class.
`void`	`load(ExecutionControl.ClassBytecodes[] cbcs)`	Attempts to load new classes.
`void`	`redefine(ExecutionControl.ClassBytecodes[] cbcs)`	Attempts to redefine previously loaded classes.
`void`	`stop()`	Interrupts a running invoke.
`String`	`varValue(String className, String varName)`	Returns the value of a variable.

Method Details
- load
  
  void load(ExecutionControl.ClassBytecodes[] cbcs) throws ExecutionControl.ClassInstallException, ExecutionControl.NotImplementedException, ExecutionControl.EngineTerminationException
  
  Attempts to load new classes.
  
  Parameters:
  
  cbcs - the class name and bytecodes to load
  
  Throws:
  
  ExecutionControl.ClassInstallException - exception occurred loading the classes, some or all were not loaded
  
  ExecutionControl.NotImplementedException - if not implemented
  
  ExecutionControl.EngineTerminationException - the execution engine has terminated
- redefine
  
  void redefine(ExecutionControl.ClassBytecodes[] cbcs) throws ExecutionControl.ClassInstallException,

Interface ExecutionControl

Nested Class Summary

Method Summary

Method Details

load

redefine