php.java.script.servlet
Class InvocablePhpServletScriptEngine

java.lang.Object
  javax.script.AbstractScriptEngine
      php.java.script.InvocablePhpScriptEngine
          php.java.script.servlet.InvocablePhpServletScriptEngine

All Implemented Interfaces:

Invocable, ScriptEngine

public class InvocablePhpServletScriptEngine
extends InvocablePhpScriptEngine

A PHP script engine which implements the Invocable interface for Servlets. See ContextLoaderListener for details. PHP scripts are evaluated as follows:

1. <?php require_once("http://127.0.0.1:CURRENT_PORT/CURRENT_WEBAPP/java/Java.inc"?>
   
2. Your script is evaluated
3. <?php java_context()->call(java_closure());?> is called in order to make the script invocable
   

In order to evaluate PHP methods follow these steps:

1. Create a factory which creates a PHP script file from a reader using the methods from EngineFactory:

   private static File script;
private static final File getScriptF() {
if (script!=null) return script;

String webCacheDir = ctx.getRealPath(req.getServletPath());
Reader reader = new StringReader ("<?php function f($v) {return "passed:".$v;} ?>");
return EngineFactory.getPhpScript(webCacheDir, reader);
}


2. Aquire a PHP invocable script engine from the EngineFactory:

   ScriptEngine scriptEngine = EngineFactory.getInvocablePhpScriptEngine(this, ctx, req, res);

3. Create a FileReader for the created script file:

   Reader readerF = EngineFactory.createPhpScriptFileReader(getScriptF());

4. Evaluate the engine:

   scriptEngine.eval(readerF);

5. Close the reader obtained from the EngineFactory:

   readerF.close();

6. Cast the engine to Invocable:

   Invocable invocableEngine = (Invocable)scriptEngine;

7. Call PHP functions or methods:

   System.out.println("result from PHP:" + invocableEngine.invoceFunction(f, new Object[]{"arg1"}));

8. Release the invocable by evaluating the engine again with a NULL value.

   scriptEngine.eval((Reader)null);

Alternatively one may use the following "quick and dirty" code which creates a new PHP script for each eval and removes it when the invocable is released:

ScriptEngine e = EngineFactory.getInvocablePhpScriptEngine(this, ctx, req, res);
e.eval("<?php function f($v) {return "passed:".$v;} ?>");
((Invocable)e).invoceFunction("f", new Object[]{"arg1"};
e.eval((Reader)null);


Field Summary

Fields inherited from interface javax.script.ScriptEngine

ARGV, ENGINE, ENGINE_VERSION, FILENAME, LANGUAGE, LANGUAGE_VERSION, NAME

Constructor Summary

InvocablePhpServletScriptEngine(javax.servlet.Servlet servlet, javax.servlet.ServletContext ctx, javax.servlet.http.HttpServletRequest req, javax.servlet.http.HttpServletResponse res)

Method Summary

Bindings	createBindings() Retrieves an uninitailized namespace which can be used as the scope of the ScriptEngine.
java.lang.Object	eval(java.io.Reader reader, ScriptContext context) Evaluates a script obtained using the specified reader as the script source and using the namespaces in the specifed ScriptContext.
java.lang.Object	eval(java.lang.String script, ScriptContext context) Evaluates a script using the namespaces in the specifed ScriptContext.
ScriptEngineFactory	getFactory() Retrieves a ScriptEngineFactory for the class to which describes the underlying ScriptEngine.
void	release() Release the continuation

Methods inherited from class php.java.script.InvocablePhpScriptEngine

getInterface, getInterface, invoke, invoke, invokeFunction, invokeMethod

Methods inherited from class javax.script.AbstractScriptEngine

eval, eval, eval, eval, get, getBindings, getContext, put, setBindings, setContext

Methods inherited from class java.lang.Object

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

Constructor Detail

InvocablePhpServletScriptEngine

public InvocablePhpServletScriptEngine(javax.servlet.Servlet servlet,
                                       javax.servlet.ServletContext ctx,
                                       javax.servlet.http.HttpServletRequest req,
                                       javax.servlet.http.HttpServletResponse res)
                                throws java.net.MalformedURLException,
                                       java.net.URISyntaxException

Throws:

java.net.MalformedURLException

java.net.URISyntaxException

Method Detail

release

public void release()

Release the continuation

Overrides:

release in class InvocablePhpScriptEngine

eval

public java.lang.Object eval(java.io.Reader reader,
                             ScriptContext context)
                      throws ScriptException

Description copied from interface: ScriptEngine

Evaluates a script obtained using the specified reader as the script source and using the namespaces in the specifed ScriptContext. Returns null for non-returning scripts

Parameters:

reader - the script source

context - the context contianing different namespace for script evaluation

Returns:

the value of the evaluated script

Throws:

ScriptException - if an error occurs

eval

public java.lang.Object eval(java.lang.String script,
                             ScriptContext context)
                      throws ScriptException

Description copied from interface: ScriptEngine

Evaluates a script using the namespaces in the specifed ScriptContext. Return null for non-returning scripts.

Parameters:

script - the String representation of the script

context - tbe ScriptContext containing namespaces for the script evaluation

Returns:

the value of the evaluated script

Throws:

ScriptException - if an error occurs

getFactory

public ScriptEngineFactory getFactory()

Description copied from interface: ScriptEngine

Retrieves a ScriptEngineFactory for the class to which describes the underlying ScriptEngine.

Returns:

an instance of ScriptEngineFactory which describes the underlying ScriptEngine

createBindings

public Bindings createBindings()

Retrieves an uninitailized namespace which can be used as the scope of the ScriptEngine.

Returns:

an initialzed namespace which can be used to repalce the state of the ScriptEngine