org.mozilla.javascript.ContextFactory类的使用及代码示例

x33g5p2x  于2022-01-18 转载在 JavaScript  
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本文整理了Java中org.mozilla.javascript.ContextFactory类的一些代码示例，展示了ContextFactory类的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。ContextFactory类的具体详情如下：
包路径：org.mozilla.javascript.ContextFactory
类名称：ContextFactory

ContextFactory介绍

[英]Factory class that Rhino runtime uses to create new Contextinstances. A ContextFactory can also notify listeners about context creation and release.

When the Rhino runtime needs to create new Context instance during execution of Context#enter() or Context, it will call #makeContext() of the current global ContextFactory. See #getGlobal() and #initGlobal(ContextFactory).

It is also possible to use explicit ContextFactory instances for Context creation. This is useful to have a set of independent Rhino runtime instances under single JVM. See #call(ContextAction).

The following example demonstrates Context customization to terminate scripts running more then 10 seconds and to provide better compatibility with JavaScript code using MSIE-specific features.

import org.mozilla.javascript.*; 
class MyFactory extends ContextFactory 
{ 
// Custom  
Context to store execution time. 
private static class MyContext extends Context 
{ 
long startTime; 
} 
static { 
// Initialize GlobalFactory with custom factory 
ContextFactory.initGlobal(new MyFactory()); 
} 
// Override  
#makeContext()protected Context makeContext() 
{ 
MyContext cx = new MyContext(); 
// Make Rhino runtime to call observeInstructionCount 
// each 10000 bytecode instructions 
cx.setInstructionObserverThreshold(10000); 
return cx; 
} 
// Override  
#hasFeature(Context,int)public boolean hasFeature(Context cx, int featureIndex) 
{ 
// Turn on maximum compatibility with MSIE scripts 
switch (featureIndex) { 
case  
Context#FEATURE_NON_ECMA_GET_YEAR: 
return true; 
case  
Context#FEATURE_MEMBER_EXPR_AS_FUNCTION_NAME: 
return true; 
case  
Context#FEATURE_RESERVED_KEYWORD_AS_IDENTIFIER: 
return true; 
case  
Context#FEATURE_PARENT_PROTO_PROPERTIES: 
return false; 
} 
return super.hasFeature(cx, featureIndex); 
} 
// Override  
#observeInstructionCount(Context,int)protected void observeInstructionCount(Context cx, int instructionCount) 
{ 
MyContext mcx = (MyContext)cx; 
long currentTime = System.currentTimeMillis(); 
if (currentTime - mcx.startTime > 10*1000) { 
// More then 10 seconds from Context creation time: 
// it is time to stop the script. 
// Throw Error instance to ensure that script will never 
// get control back through catch or finally. 
throw new Error(); 
} 
} 
// Override  
#doTopCall(Callable,Context,Scriptable,Scriptable,Object[])protected Object doTopCall(Callable callable, 
Context cx, Scriptable scope, 
Scriptable thisObj, Object[] args) 
{ 
MyContext mcx = (MyContext)cx; 
mcx.startTime = System.currentTimeMillis(); 
return super.doTopCall(callable, cx, scope, thisObj, args); 
} 
}

[中]Rhino运行时用于创建新ContextInstance的工厂类。ContextFactory还可以通知侦听器上下文的创建和释放。
当Rhino运行时需要在执行Context#enter（）或Context时创建新的Context实例时，它将调用当前全局ContextFactory的#makeContext（）。请参阅#getGlobal（）和#initGlobal（ContextFactory）。
还可以使用显式ContextFactory实例创建上下文。在单个JVM下拥有一组独立的Rhino运行时实例非常有用。参见#调用（上下文操作）。
下面的示例演示了上下文自定义，以终止运行超过10秒的脚本，并使用MSIE特定功能提供与JavaScript代码更好的兼容性。

import org.mozilla.javascript.*; 
class MyFactory extends ContextFactory 
{ 
// Custom  
Context to store execution time. 
private static class MyContext extends Context 
{ 
long startTime; 
} 
static { 
// Initialize GlobalFactory with custom factory 
ContextFactory.initGlobal(new MyFactory()); 
} 
// Override  
#makeContext()protected Context makeContext() 
{ 
MyContext cx = new MyContext(); 
// Make Rhino runtime to call observeInstructionCount 
// each 10000 bytecode instructions 
cx.setInstructionObserverThreshold(10000); 
return cx; 
} 
// Override  
#hasFeature(Context,int)public boolean hasFeature(Context cx, int featureIndex) 
{ 
// Turn on maximum compatibility with MSIE scripts 
switch (featureIndex) { 
case  
Context#FEATURE_NON_ECMA_GET_YEAR: 
return true; 
case  
Context#FEATURE_MEMBER_EXPR_AS_FUNCTION_NAME: 
return true; 
case  
Context#FEATURE_RESERVED_KEYWORD_AS_IDENTIFIER: 
return true; 
case  
Context#FEATURE_PARENT_PROTO_PROPERTIES: 
return false; 
} 
return super.hasFeature(cx, featureIndex); 
} 
// Override  
#observeInstructionCount(Context,int)protected void observeInstructionCount(Context cx, int instructionCount) 
{ 
MyContext mcx = (MyContext)cx; 
long currentTime = System.currentTimeMillis(); 
if (currentTime - mcx.startTime > 10*1000) { 
// More then 10 seconds from Context creation time: 
// it is time to stop the script. 
// Throw Error instance to ensure that script will never 
// get control back through catch or finally. 
throw new Error(); 
} 
} 
// Override  
#doTopCall(Callable,Context,Scriptable,Scriptable,Object[])protected Object doTopCall(Callable callable, 
Context cx, Scriptable scope, 
Scriptable thisObj, Object[] args) 
{ 
MyContext mcx = (MyContext)cx; 
mcx.startTime = System.currentTimeMillis(); 
return super.doTopCall(callable, cx, scope, thisObj, args); 
} 
}

代码示例

代码示例来源：origin: pentaho/pentaho-kettle

Script jsscript;
jscx = ContextFactory.getGlobal().enterContext();
jsscope = jscx.initStandardObjects( null, false );
try {
 jscx.setOptimizationLevel( Integer.valueOf( transMeta.environmentSubstitute( optimizationLevel ) ) );
} catch ( NumberFormatException nfe ) {
 error_message =
  Scriptable jsR = Context.toObject( jsScripts[i].getScript(), jsscope );
  jsscope.put( jsScripts[i].getScriptName(), jsscope, jsR );

代码示例来源：origin: EngineHub/WorldEdit

@Override
protected Object doTopCall(Callable callable, Context cx, Scriptable scope,
    Scriptable thisObj, Object[] args) {
  RhinoContext mcx = (RhinoContext) cx;
  mcx.startTime = System.currentTimeMillis();
  return super.doTopCall(callable, cx, scope, thisObj, args);
}

代码示例来源：origin: galenframework/galen

public static String getVersion() {
  return ContextFactory.getGlobal().enterContext().getImplementationVersion();
}

代码示例来源：origin: apache/incubator-druid

private static Function compile(String function)
{
 final ContextFactory contextFactory = ContextFactory.getGlobal();
 final Context context = contextFactory.enterContext();
 context.setOptimizationLevel(JavaScriptConfig.DEFAULT_OPTIMIZATION_LEVEL);
 final ScriptableObject scope = context.initStandardObjects();
 final org.mozilla.javascript.Function fn = context.compileFunction(scope, function, "fn", 1, null);
 Context.exit();
 return new Function()
 {
  @Override
  public double apply(Object[] args)
  {
   // ideally we need a close() function to discard the context once it is not used anymore
   Context cx = Context.getCurrentContext();
   if (cx == null) {
    cx = contextFactory.enterContext();
   }
   return Context.toNumber(fn.call(cx, scope, scope, args));
  }
 };
}

代码示例来源：origin: spring-projects/spring-framework

@Before
public void setUp() {
  request = new MockHttpServletRequest();
  response = new MockHttpServletResponse();
  jsContext = ContextFactory.getGlobal().enterContext();
  jsScope = jsContext.initStandardObjects();
  view = new MappingJackson2JsonView();
}

代码示例来源：origin: pentaho/pentaho-kettle

Scriptable scope;
cx = ContextFactory.getGlobal().enterContext();
 scope = cx.initStandardObjects( null );
  Object res = cx.evaluateString( scope, this.script, "<cmd>", 1, null );
  boolean retval = Context.toBoolean( res );

代码示例来源：origin: apache/incubator-druid

@Override
 public Object apply(Object input)
 {
  // ideally we need a close() function to discard the context once it is not used anymore
  Context cx = Context.getCurrentContext();
  if (cx == null) {
   cx = contextFactory.enterContext();
  }
  final Object res = fn.call(cx, scope, scope, new Object[]{input});
  return res != null ? Context.toObject(res, scope) : null;
 }
};

代码示例来源：origin: org.apache.xmlgraphics/batik-bridge

/**
   * Creates a Context object for use with the interpreter.
   */
  protected Context makeContext() {
    Context cx = super.makeContext();
    cx.setWrapFactory(wrapFactory);
    cx.setSecurityController(securityController);
    cx.setClassShutter(classShutter);
    if (rhinoClassLoader == null) {
      cx.setOptimizationLevel(-1);
    }
    return cx;
  }
}

代码示例来源：origin: apache/incubator-druid

@Override
 public String apply(Object input)
 {
  // ideally we need a close() function to discard the context once it is not used anymore
  Context cx = Context.getCurrentContext();
  if (cx == null) {
   cx = contextFactory.enterContext();
  }
  final Object res = fn.call(cx, scope, scope, new Object[]{input});
  return res != null ? Context.toString(res) : null;
 }
};

代码示例来源：origin: rhino/js

/**
 * @deprecated
 * @see ContextFactory#removeListener(ContextFactory.Listener)
 * @see ContextFactory#getGlobal()
 */
public static void removeContextListener(ContextListener listener)
{
  ContextFactory.getGlobal().addListener(listener);
}

代码示例来源：origin: datacleaner/DataCleaner

@Close
public void close() {
  final Context context = _contextFactory.enterContext();
  try {
    _closeFunction.call(context, _sharedScope, _sharedScope, new Object[0]);
  } finally {
    Context.exit();
  }
}

代码示例来源：origin: cat.inspiracio/rhino-js-engine

protected Context makeContext() {
    Context cx = super.makeContext();
    cx.setOptimizationLevel(-1);
    return cx;
  }
});

代码示例来源：origin: apache/incubator-druid

@Override
 public double apply(Object[] args)
 {
  // ideally we need a close() function to discard the context once it is not used anymore
  Context cx = Context.getCurrentContext();
  if (cx == null) {
   cx = contextFactory.enterContext();
  }
  return Context.toNumber(fn.call(cx, scope, scope, args));
 }
};

代码示例来源：origin: io.apisense/rhino-android

/**
 * Create new Context instance to be associated with the current thread.
 */
@Override
protected Context makeContext() {
  Context cx = super.makeContext();
  cx.setLanguageVersion(languageVersion);
  cx.setOptimizationLevel(optimizationLevel);
  cx.setClassShutter(RhinoClassShutter.getInstance());
  cx.setWrapFactory(RhinoWrapFactory.getInstance());
  return cx;
}

代码示例来源：origin: rhino/js

public static Scriptable runScript(final Script script)
{
  return (Scriptable)ContextFactory.getGlobal().call(
    new ContextAction() {
      public Object run(Context cx)
      {
        ScriptableObject global = ScriptRuntime.getGlobal(cx);
        script.exec(cx, global);
        return global;
      }
    });
}

代码示例来源：origin: cat.inspiracio/rhino-js-engine

public void initialize() {
  if (!initialized) {
    if ("true".equals(getProperty(USE_INTERPRETER_SYSTEM_PROPERTY))) {
      if (!ContextFactory.hasExplicitGlobal()) {
        ContextFactory.initGlobal(new ContextFactory() {
          protected Context makeContext() {
            Context cx = super.makeContext();
            cx.setOptimizationLevel(-1);
            return cx;
          }
        });
      }
    }
    if (listener != null) {
      ContextFactory.getGlobal().addListener(listener);
    }
    initialized = true;
  }
}

代码示例来源：origin: rhq-project/rhq

@Override
protected Context makeContext() {
  Context cx = super.makeContext();
  cx.setOptimizationLevel(-1);
  cx.setWrapFactory(new CustomWrapFactory());
  return cx;
}

代码示例来源：origin: com.sun.phobos/phobos-rhino

private static Context prepareNewContext(ContextFactory factory,
                     Object contextHelper)
{
  Context cx = factory.makeContext();
  if (cx.factory != null || cx.enterCount != 0) {
    throw new IllegalStateException("factory.makeContext() returned Context instance already associated with some thread");
  }
  cx.factory = factory;
  factory.onContextCreated(cx);
  if (factory.isSealed() && !cx.isSealed()) {
    cx.seal(null);
  }
  VMBridge.instance.setContext(contextHelper, cx);
  return cx;
}

代码示例来源：origin: rhino/js

public static Object doTopCall(Callable callable,
                Context cx, Scriptable scope,
                Scriptable thisObj, Object[] args)
{
  if (scope == null)
    throw new IllegalArgumentException();
  if (cx.topCallScope != null) throw new IllegalStateException();
  Object result;
  cx.topCallScope = ScriptableObject.getTopLevelScope(scope);
  cx.useDynamicScope = cx.hasFeature(Context.FEATURE_DYNAMIC_SCOPE);
  ContextFactory f = cx.getFactory();
  try {
    result = f.doTopCall(callable, cx, scope, thisObj, args);
  } finally {
    cx.topCallScope = null;
    // Cleanup cached references
    cx.cachedXMLLib = null;
    if (cx.currentActivationCall != null) {
      // Function should always call exitActivationFunction
      // if it creates activation record
      throw new IllegalStateException();
    }
  }
  return result;
}

代码示例来源：origin: org.apache.xmlgraphics/batik-bridge

/**
 * To be used by <code>WindowWrapper</code>.
 */
void callHandler(final Function handler, final Object[] args) {
  contextFactory.call(new ContextAction() {
    public Object run(Context cx) {
      handler.call(cx, globalObject, globalObject, args);
      return null;
    }
  });
}

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