Module jdk.jshell

Package jdk.jshell.execution

Class DirectExecutionControl

java.lang.Object

jdk.jshell.execution.DirectExecutionControl

All Implemented Interfaces:

AutoCloseable, ExecutionControl

Direct Known Subclasses:

LocalExecutionControl, RemoteExecutionControl

public class DirectExecutionControl
extends Object
implements ExecutionControl

An ExecutionControl implementation that runs in the current process. May be used directly, or over a channel with Util.forwardExecutionControl(ExecutionControl, java.io.ObjectInput, java.io.ObjectOutput).

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

Method Summary

Modifier and Type	Method	Description
void	addToClasspath(String cp)	Adds the path to the execution class path.
protected void	classesRedefined(ExecutionControl.ClassBytecodes[] cbcs)	Notify that classes have been redefined.
protected void	clientCodeEnter()	Marks entry into user code.
protected void	clientCodeLeave()	Marks departure from user code.
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).
protected Class<?>	findClass(String name)	Finds the class with the specified binary name.
protected String	invoke(Method doitMethod)	Invoke the specified "doit-method", a static method with no parameters.
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.
protected String	throwConvertedInvocationException(Throwable cause)	Converts incoming exceptions in user code into instances of subtypes of ExecutionControl.ExecutionControlException and throws the converted exception.
protected String	throwConvertedOtherException(Throwable ex)	Converts incoming exceptions in agent code into instances of subtypes of ExecutionControl.ExecutionControlException and throws the converted exception.
protected static String	valueString(Object value)	Converts the Object value from ExecutionControl.invoke(String, String) or ExecutionControl.varValue(String, String) to String.
String	varValue(String className, String varName)	Returns the value of a variable.

Methods declared in class java.lang.Object

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

Constructor Details

DirectExecutionControl

public DirectExecutionControl(LoaderDelegate loaderDelegate)

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

Parameters:

loaderDelegate - the delegate to handle loading classes

DirectExecutionControl

public DirectExecutionControl()

Create an instance using the default class loading.

Method Details

load

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

Description copied from interface: ExecutionControl

Attempts to load new classes.

Specified by:

load in interface ExecutionControl

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

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

Description copied from interface: ExecutionControl

Attempts to redefine previously loaded 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

classesRedefined

protected void classesRedefined(ExecutionControl.ClassBytecodes[] cbcs)
                         throws ExecutionControl.NotImplementedException,
ExecutionControl.EngineTerminationException

Notify that classes have been redefined.

Parameters:

cbcs - the class name and bytecodes to redefine

Throws:

ExecutionControl.NotImplementedException - if not implemented

ExecutionControl.EngineTerminationException - the execution engine has terminated

invoke

public String invoke(String className,
 String methodName)
              throws ExecutionControl.RunException,
ExecutionControl.InternalException,
ExecutionControl.EngineTerminationException

Description copied from interface: ExecutionControl

Invokes an executable Snippet by calling a method on the specified wrapper class. The method must have no arguments and return String.

Specified by:

invoke in interface ExecutionControl

Parameters:

className - the class whose method should be invoked

methodName - the name of method to invoke

Returns:

the result of the execution or null if no result

Throws:

ExecutionControl.UserException - the invoke raised a user exception

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

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

ExecutionControl.InternalException - an internal problem occurred

ExecutionControl.EngineTerminationException - the execution engine has terminated

ExecutionControl.RunException

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

addToClasspath

public void addToClasspath(String cp)
                    throws ExecutionControl.EngineTerminationException,
ExecutionControl.InternalException

Description copied from interface: ExecutionControl

Adds the path to the execution class path.

Specified by:

addToClasspath in interface ExecutionControl

Parameters:

cp - the path to add

Throws:

ExecutionControl.EngineTerminationException - the execution engine has terminated

ExecutionControl.InternalException - an internal problem occurred

stop

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

Interrupts a running invoke.

Not supported.

Specified by:

stop in interface ExecutionControl

Throws:

ExecutionControl.EngineTerminationException - the execution engine has terminated

ExecutionControl.InternalException - an internal problem occurred

extensionCommand

public Object extensionCommand(String command,
 Object arg)
                        throws ExecutionControl.RunException,
ExecutionControl.EngineTerminationException,
ExecutionControl.InternalException

Description copied from interface: ExecutionControl

Run a non-standard command (or a standard command from a newer version).

Specified by:

extensionCommand in interface ExecutionControl

Parameters:

command - the non-standard command

arg - the commands argument

Returns:

the commands return value

Throws:

ExecutionControl.UserException - the command raised a user exception

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

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

ExecutionControl.EngineTerminationException - the execution engine has terminated

ExecutionControl.NotImplementedException - if not implemented

ExecutionControl.InternalException - an internal problem occurred

ExecutionControl.RunException

close

public void close()

Description copied from interface: ExecutionControl

Shuts down this execution engine. Implementation should free all resources held by this execution engine.

No calls to methods on this interface should be made after close.

Specified by:

close in interface AutoCloseable

Specified by:

close in interface ExecutionControl

findClass

protected Class<?> findClass(String name)
                      throws ClassNotFoundException

Finds the class with the specified binary name.

Parameters:

name - the binary name of the class

Returns:

the Class Object

Throws:

ClassNotFoundException - if the class could not be found

invoke

protected String invoke(Method doitMethod)
                 throws Exception

Invoke the specified "doit-method", a static method with no parameters. The invoke(java.lang.String, java.lang.String) in this class will call this to invoke.

Parameters:

doitMethod - the Method to invoke

Returns:

the value or null

Throws:

Exception - any exceptions thrown by Method.invoke(Object, Object...) or any ExecutionControl.ExecutionControlException to pass-through.

valueString

protected static String valueString(Object value)

Converts the Object value from ExecutionControl.invoke(String, String) or ExecutionControl.varValue(String, String) to String.

Parameters:

value - the value to convert

Returns:

the String representation

throwConvertedInvocationException

protected String throwConvertedInvocationException(Throwable cause)
                                            throws ExecutionControl.RunException,
ExecutionControl.InternalException

Converts incoming exceptions in user code into instances of subtypes of ExecutionControl.ExecutionControlException and throws the converted exception.

Parameters:

cause - the exception to convert

Returns:

never returns as it always throws

Throws:

ExecutionControl.RunException - for normal exception occurrences

ExecutionControl.InternalException - for internal problems

throwConvertedOtherException

protected String throwConvertedOtherException(Throwable ex)
                                       throws ExecutionControl.RunException,
ExecutionControl.InternalException

Converts incoming exceptions in agent code into instances of subtypes of ExecutionControl.ExecutionControlException and throws the converted exception.

Parameters:

ex - the exception to convert

Returns:

never returns as it always throws

Throws:

ExecutionControl.RunException - for normal exception occurrences

ExecutionControl.InternalException - for internal problems

clientCodeEnter

protected void clientCodeEnter()
                        throws ExecutionControl.InternalException

Marks entry into user code.

Throws:

ExecutionControl.InternalException - in unexpected failure cases

clientCodeLeave

protected void clientCodeLeave()
                        throws ExecutionControl.InternalException

Marks departure from user code.

Throws:

ExecutionControl.InternalException - in unexpected failure cases