Class AccessorCodeGenerator

  • All Implemented Interfaces:
    java.lang.Cloneable, Changeable, Debuggable, DebugListener, Decorator, Derivable, ModelErrorHandler, MoMLExportable, Moveable, Nameable
    Direct Known Subclasses:

    public class AccessorCodeGenerator
    extends RunnableCodeGenerator
    Generate a JavaScript Accessor for a model.

    Accessors are a technology, developed by the TerraSwarm Research Center, for composing heterogeneous devices and services in the Internet of Things (IoT). For more information, see

    The model can only contain JavaScript and JSAccessor actors.

    To generate an Accessor version of a model, use:

      java -classpath $PTII -language accessor $PTII/ptolemy/cg/kernel/generic/accessor/demo/TestComposite/TestComposite.xml; cat $PTII/org/terraswarm/accessor/accessors/web/cg/TestComposite.js
    which is shorthand for:
      java -classpath $PTII -generatorPackage -generatorPackageList generic.accessor $PTII/ptolemy/cg/adapter/generic/accessor/adapters/org/test/auto/TestComposite.xml; cat ~/cg/TestComposite.js

    For more information, see

    Ptolemy II 11.0
    Christopher Brooks. Contributor: Edward A. Lee. Based on HTMLCodeGenerator by Man-Kit Leung, Bert Rodiers
    red (cxh)
    red (cxh)
    • Field Detail

      • modules

        public StringParameter modules
        A comma separated list of modules to be installed.
      • npmInstall

        public Parameter npmInstall
        If true, then search codeDirectory and its parent directories for a node_modules/ directory. If it is found, then search for the modules listed in the modules parameter in that directory. If any module is not found, then install all the modules using npm install. If all the modules are found, then don't bother installing.

        The reason to set this to false is if the host is not connected to the internet or if the host already has the modules installed. Setting this to false means that the composite accessor will be deployed more quickly because npm install will not be run. The default value is false, indicating that npm install modules should not be run.

      • _checkForLocalModules

        protected boolean _checkForLocalModules
        If true, the _setupCommands() will check for modules in the local directory. Derived classes like AccessorSSHCodeGenerator set this to false.
    • Constructor Detail

      • AccessorCodeGenerator

        public AccessorCodeGenerator​(NamedObj container,
                                     java.lang.String name)
                              throws IllegalActionException,
        Create a new instance of the AccessorCodeGenerator. The value of the generatorPackageList parameter of the base class is set to generic.accessor
        container - The container.
        name - The name of the AccessorCodeGenerator.
        IllegalActionException - If the super class throws the exception or error occurs when setting the file path.
        NameDuplicationException - If the super class throws the exception or an error occurs when setting the file path.
    • Method Detail

      • comment

        public java.lang.String comment​(java.lang.String comment)
        Return a formatted comment containing the specified string. In this base class, the comments is a Accessor-style comment, which begins with "//" followed by the platform dependent end of line character(s): under Unix: "\n", under Windows: "\n\r".o Subclasses may override this produce comments that match the code generation language.
        comment in class GenericCodeGenerator
        comment - The string to put in the comment.
        A formatted comment.
      • _generateCode

        protected int _generateCode​(java.lang.StringBuffer code)
                             throws KernelException
        Generate Accessor code and append it to the given string buffer. Write the code to the directory specified by the codeDirectory parameter. The file name is a sanitized version of the model name with a suffix that is based on last package name of the generatorPackage parameter. Thus if the codeDirectory is $HOME/cg, the name of the model is Foo and the generatorPackage is, then the file that is written will be $HOME/cg/Foo.js

        This method is the main entry point to generate js.

        This method invokes the top level generateAccessor(), which is typically defined in ptolemy/cg/adapter/generic/accessor/adapters/ptolemy/actor/lib/jjs/

        _generateCode in class GenericCodeGenerator
        code - The given string buffer.
        The return value of the last subprocess that was executed. or -1 if no commands were executed.
        KernelException - If the target file cannot be overwritten or write-to-file throw any exception.
      • _getAdapterClassFilter

        protected java.lang.Class<?> _getAdapterClassFilter()
        Return the filter class to find adapters. All adapters have to extend this class.
        _getAdapterClassFilter in class GenericCodeGenerator
        The base class for the adapters.
      • _setupCommands

        protected java.util.List<java.lang.String> _setupCommands()
                                                           throws IllegalActionException
        Return a list of setup commands to be invoked before the run command. In this class, the "npm install" command is added if the value of the npmInstall parameter is true and the value of the modules parameter is not empty.
        _setupCommands in class RunnableCodeGenerator
        The list of commands.
        IllegalActionException - If there is a problem getting the value of the modules parameter