Examples of org.apache.bsf.BSFEngine

org.apache.bsf.BSFEngine
This is the view of a scripting engine assumed by the Bean Scripting Framework. This interface is used when an application decides to run some script under application control. (This is the reverse of the more common situation, which is that of the scripting language calling into the application.)
When a scripting engine is first fired up, the initialize() method is called right after construction.
A scripting engine must provide two access points for applications to call into them: via function calls and via expression evaluation. It must also support loading scripts.
A scripting engine is a property change listener and will be notified when any of the relevant properties of the manager change. (See BSFManager to see which of its properties are bound.) @author Sanjiva Weerawarana @author Matthew J. Duftler

        answer = manager.eval("groovy", "Test1.groovy", 0, 0, "abc");
        assertNull("Undeclared beans should yield null", answer);
    }


    public void testCall() throws Exception {
        BSFEngine bsfEngine = manager.loadScriptingEngine("groovy");
        manager.declareBean("myvar", "hello", String.class);
        Object myvar = manager.lookupBean("myvar");
        String result = (String) bsfEngine.call(myvar, "reverse", new Object[]{});
        assertEquals("olleh", result);
    }

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        manager = new BSFManager();
    }


    public void testVersion() throws Exception {
        //System.out.println("BSFManager.getVersion() = " + BSFManager.getVersion());
        BSFEngine bsfEngine = manager.loadScriptingEngine("groovy");
        assertEquals(CACHING_ENGINE, bsfEngine.getClass());
    }

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    }


    public boolean mediate(MessageContext synCtx) {
        try {


            BSFEngine engine = getBSFEngine(synCtx.getConfiguration());


            Object[] args = new Object[] { new ScriptMessageContext(synCtx, convertor) };


            Object response = engine.call(null, functionName, args);
            if (response instanceof Boolean) {
                return ((Boolean) response).booleanValue();
            }


            return true; // default to returning true

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    protected BSFEngine createBSFEngine(String scriptName, String scriptSrc) {
        try {


            String scriptLanguage = BSFManager.getLangFromFilename(scriptName);
            BSFEngine bsfEngine = bsfManager.loadScriptingEngine(scriptLanguage);
            bsfEngine.exec(scriptName, 0, 0, scriptSrc);


            return bsfEngine;


        } catch (BSFException e) {
            throw new SynapseException(e.getTargetException());

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        SampleResult prev = jmctx.getPreviousResult();
        mgr.declareBean("prev", prev, SampleResult.class);
    }


    protected void processFileOrScript(BSFManager mgr) throws BSFException{
        BSFEngine bsfEngine = mgr.loadScriptingEngine(getScriptLanguage());
        final String scriptFile = getFilename();
        if (scriptFile.length() == 0) {
            bsfEngine.exec("[script]",0,0,getScript());
        } else {// we have a file, read and process it
            try {
                String script=FileUtils.readFileToString(new File(scriptFile));
                bsfEngine.exec(scriptFile,0,0,script);
            } catch (IOException e) {
                log.warn(e.getLocalizedMessage());
                throw new BSFException(BSFException.REASON_IO_ERROR,"Problem reading script file",e);
            }
        }

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            }
        }
    }


    protected Object evalFileOrScript(BSFManager mgr) throws BSFException{
        BSFEngine bsfEngine = mgr.loadScriptingEngine(getScriptLanguage());
        final String scriptFile = getFilename();
        if (scriptFile.length() == 0) {
            return bsfEngine.eval("[script]",0,0,getScript());
        } else {// we have a file, read and process it
            try {
                String script=FileUtils.readFileToString(new File(scriptFile));
                return bsfEngine.eval(scriptFile,0,0,script);
            } catch (IOException e) {
                log.warn(e.getLocalizedMessage());
                throw new BSFException(BSFException.REASON_IO_ERROR,"Problem reading script file",e);
            }
        }

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        final String fileName = getFilename();
        log.debug(label + " " + fileName);
        SampleResult res = new SampleResult();
        res.setSampleLabel(label);
        InputStream is = null;
        BSFEngine bsfEngine = null;
        // There's little point saving the manager between invocations
        // as we need to reset most of the beans anyway
        BSFManager mgr = new BSFManager();


        // TODO: find out how to retrieve these from the script
        // At present the script has to use SampleResult methods to set them.
        res.setResponseCode("200"); // $NON-NLS-1$
        res.setResponseMessage("OK"); // $NON-NLS-1$
        res.setSuccessful(true);
        res.setDataType(SampleResult.TEXT); // Default (can be overridden by the script)


        res.sampleStart();
        try {
            initManager(mgr);
            mgr.declareBean("SampleResult", res, res.getClass()); // $NON-NLS-1$


            // These are not useful yet, as have not found how to get updated values back
            //mgr.declareBean("ResponseCode", "200", String.class); // $NON-NLS-1$
            //mgr.declareBean("ResponseMessage", "OK", String.class); // $NON-NLS-1$
            //mgr.declareBean("IsSuccess", Boolean.TRUE, Boolean.class); // $NON-NLS-1$


            // N.B. some engines (e.g. Javascript) cannot handle certain declareBean() calls
            // after the engine has been initialised, so create the engine last
            bsfEngine = mgr.loadScriptingEngine(getScriptLanguage());


            Object bsfOut = null;
            if (fileName.length()>0) {
                res.setSamplerData("File: "+fileName);
                is = new BufferedInputStream(new FileInputStream(fileName));
                bsfOut = bsfEngine.eval(fileName, 0, 0, IOUtils.toString(is));
            } else {
                res.setSamplerData(request);
                bsfOut = bsfEngine.eval("script", 0, 0, request);
            }


            if (bsfOut != null) {
                res.setResponseData(bsfOut.toString(), null);
            }

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      String [] bshExtensions = { "bsh" };
      String bshEngine = "bsh.util.BeanShellBSFEngine";
      BSFManager.registerScriptingEngine("beanshell", bshEngine, bshExtensions);


      // 2. Load Scripting Engine
      @SuppressWarnings("unused")    //for completeness
      BSFEngine engine = bsfMgr_.loadScriptingEngine("beanshell");


      // 3. Map application objects
      bsfMgr_.declareBean("ScriptAPI", scriptAPI_, ScriptAPI.class);
      //legacy

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        final String fileName = getFilename();
    log.debug(label + " " + fileName);
    SampleResult res = new SampleResult();
    res.setSampleLabel(label);
    FileInputStream is = null;
    BSFEngine bsfEngine = null;
    // There's little point saving the manager between invocations
    // as we need to reset most of the beans anyway
        BSFManager mgr = new BSFManager();


        // TODO: find out how to retrieve these from the script
        // At present the script has to use SampleResult methods to set them.
        res.setResponseCode("200"); // $NON-NLS-1$
        res.setResponseMessage("OK"); // $NON-NLS-1$
        res.setSuccessful(true);
        res.setDataType(SampleResult.TEXT); // Default (can be overridden by the script)


        res.sampleStart();
    try {
      initManager(mgr);
      mgr.declareBean("SampleResult", res, res.getClass()); // $NON-NLS-1$
      
      // These are not useful yet, as have not found how to get updated values back
      //mgr.declareBean("ResponseCode", "200", String.class); // $NON-NLS-1$
      //mgr.declareBean("ResponseMessage", "OK", String.class); // $NON-NLS-1$
      //mgr.declareBean("IsSuccess", Boolean.TRUE, Boolean.class); // $NON-NLS-1$


      // N.B. some engines (e.g. Javascript) cannot handle certain declareBean() calls
      // after the engine has been initialised, so create the engine last
      bsfEngine = mgr.loadScriptingEngine(getScriptLanguage());


      Object bsfOut = null;
      if (fileName.length()>0) {
        res.setSamplerData("File: "+fileName);
        is = new FileInputStream(fileName);
        bsfOut = bsfEngine.eval(fileName, 0, 0, IOUtils.toString(is));
      } else {
        res.setSamplerData(request);
          bsfOut = bsfEngine.eval("script", 0, 0, request);
      }


      if (bsfOut != null) {
          res.setResponseData(bsfOut.toString().getBytes());
      }

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        // For use in debugging:
        mgr.declareBean("OUT", System.out, PrintStream.class);
    }


    protected void processFileOrScript(BSFManager mgr) throws BSFException{
        BSFEngine bsfEngine = mgr.loadScriptingEngine(getScriptLanguage());
    final String scriptFile = getFilename();
        if (scriptFile.length() == 0) {
      bsfEngine.exec("[script]",0,0,getScript());
    } 
    bsfEngine.exec(scriptFile,0,0,scriptFile);
    }

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