在执行过程中停止Rhino引擎

Question

Rhino引擎是否有api可以在中间停止执行脚本.例如,我有一个脚本文件,其中有一个infinte循环.如何在中间停止执行？

当然,我可以阻止启动Rhino引擎的jvm来执行脚本.但是我不想因为这个原因而杀死整个jvm会话,因为我已经以编程方式启动了脚本,并且Rhino Engine也在与我的应用程序相同的JVM中运行.

Answer 1

停止执行运行JavaScript可以通过以下方式完成.

1)创建一个虚拟调试器并将其附加到最初创建的上下文.

mContext = Context.enter();
ObservingDebugger observingDebugger = new ObservingDebugger();
mContext.setDebugger(observingDebugger,new Integer(0));
mContext.setGeneratingDebug(真);
mContext.setOptimizationLevel(-1);

ObservingDebugger代码如下所示.

import org.mozilla.javascript.Context;
import org.mozilla.javascript.Scriptable;
import org.mozilla.javascript.debug.DebugFrame;
import org.mozilla.javascript.debug.DebuggableScript;
import org.mozilla.javascript.debug.Debugger;

public class ObservingDebugger implements Debugger 
{
boolean isDisconnected = false;

private DebugFrame debugFrame = null;

public boolean isDisconnected() {
    return isDisconnected;
}

public void setDisconnected(boolean isDisconnected) {
    this.isDisconnected = isDisconnected;
    if(debugFrame != null){
       ((ObservingDebugFrame)debugFrame).setDisconnected(isDisconnected);
    }
}

public ObservingDebugger() {

}

public DebugFrame getFrame(Context cx, DebuggableScript fnOrScript)
{
    if(debugFrame == null){
        debugFrame = new ObservingDebugFrame(isDisconnected);
    }
    return debugFrame;      
}

@Override
public void handleCompilationDone(Context arg0, DebuggableScript arg1, String arg2) {   } }
// internal ObservingDebugFrame class
class ObservingDebugFrame implements DebugFrame
   {
boolean isDisconnected = false;

public boolean isDisconnected() {
    return isDisconnected;
}

public void setDisconnected(boolean isDisconnected) {
    this.isDisconnected = isDisconnected;
}

ObservingDebugFrame(boolean isDisconnected)
{
    this.isDisconnected = isDisconnected;
}

public void onEnter(Context cx, Scriptable activation,
        Scriptable thisObj, Object[] args)
{ }

public void onLineChange(Context cx, int lineNumber) 
{
    if(isDisconnected){
        throw new RuntimeException("Script Execution terminaed");
    }
}

public void onExceptionThrown(Context cx, Throwable ex)
{ }

public void onExit(Context cx, boolean byThrow,
        Object resultOrException)
{ }

@Override
public void onDebuggerStatement(Context arg0) { } }

ObservingDebugger类将管理布尔变量"isDisconnected",当用户单击停止按钮(想要停止执行)时,此变量将设置为true.一旦变量设置为true,如下所示,Rhino Execution将立即终止.

observingDebugger.setDisconnected(true);