Defines the Service Provider Interface for pluggable JShell execution engines. The JShell core tracks and compiles Snippets then sends them (represented in a wrapper class) to the execution engine for loading, and in the case of executable Snippets, execution. The JShell implementation includes a default execution engine (currently a remote process which is JDI controlled). By implementing the
ExecutionControlinterface and its generating class, an implementation of the
ExecutionControlProviderinterface, and installing it with
JShell.Builder.executionEngine(String)other execution engines can be used. Where the passed String is an
ExecutionControl spec is the
name optionally followed by a parameter specification.
The syntax of the spec is:
spec := name : params | name name := identifier params := param , params | param | param := identifier ( value )Where 'name' is the
ExecutionControlProvidername. Where 'param' is a Map key from
ExecutionControlProvider.defaultParameters()and the parenthesized value; See, for example,
JdiExecutionControlProvider. Where 'identifier' is a sequence of Java identifier part characters from the Basic Multilingual Plane.
- See Also:
for execution implementation support
PackageDescriptionProvides interfaces for creating tools, such as a Read-Eval-Print Loop (REPL), which interactively evaluate "snippets" of Java programming language code.Provides implementation support for building JShell execution engines.Provides a mechanism to launch an instance of a Java shell tool.
InterfaceDescriptionThis interface specifies the functionality that must provided to implement a pluggable JShell execution engine.The provider used by JShell to generate the execution engine needed to evaluate Snippets.Functionality made available to a pluggable JShell execution engine.
ClassDescriptionBundles class name with class bytecodes.
ExceptionDescriptionA class install (load or redefine) encountered a problem.Unbidden execution engine termination has occurred.The abstract base of all
ExecutionControlexceptions.An internal problem has occurred.The command is not implemented.An exception indicating that a
DeclarationSnippetwith unresolved references has been encountered.The abstract base of of exceptions specific to running user code.An exception indicating that an
ExecutionControl.invoke(java.lang.String, java.lang.String)(or theoretically a
ExecutionControl.varValue(java.lang.String, java.lang.String)) has been interrupted by a
ExecutionControl.stop().A 'normal' user exception occurred.The construction and throw of this exception is embedded in code generated by the JShell core implementation in such a way that, upon executing a
RECOVERABLE_DEFINEDuser method, this exception is thrown.