Java SharedSecrets.getJavaLangAccess方法代码示例

import sun.misc.SharedSecrets; //导入方法依赖的package包/类
private void inferCaller() {
    needToInferCaller = false;
    JavaLangAccess access = SharedSecrets.getJavaLangAccess();
    Throwable throwable = new Throwable();
    int depth = access.getStackTraceDepth(throwable);

    boolean lookingForLogger = true;
    for (int ix = 0; ix < depth; ix++) {
        // Calling getStackTraceElement directly prevents the VM
        // from paying the cost of building the entire stack frame.
        StackTraceElement frame =
            access.getStackTraceElement(throwable, ix);
        String cname = frame.getClassName();
        boolean isLoggerImpl = isLoggerImplFrame(cname);
        if (lookingForLogger) {
            // Skip all frames until we have found the first logger frame.
            if (isLoggerImpl) {
                lookingForLogger = false;
            }
        } else {
            if (!isLoggerImpl) {
                // skip reflection call
                if (!cname.startsWith("java.lang.reflect.") && !cname.startsWith("sun.reflect.")) {
                   // We've found the relevant frame.
                   setSourceClassName(cname);
                   setSourceMethodName(frame.getMethodName());
                   return;
                }
            }
        }
    }
    // We haven't found a suitable frame, so just punt.  This is
    // OK as we are only committed to making a "best effort" here.
}
 

import sun.misc.SharedSecrets; //导入方法依赖的package包/类
private String getCallerInfo() {
    String sourceClassName = null;
    String sourceMethodName = null;

    JavaLangAccess access = SharedSecrets.getJavaLangAccess();
    Throwable throwable = new Throwable();
    int depth = access.getStackTraceDepth(throwable);

    String logClassName = "sun.util.logging.PlatformLogger";
    boolean lookingForLogger = true;
    for (int ix = 0; ix < depth; ix++) {
        // Calling getStackTraceElement directly prevents the VM
        // from paying the cost of building the entire stack frame.
        StackTraceElement frame =
            access.getStackTraceElement(throwable, ix);
        String cname = frame.getClassName();
        if (lookingForLogger) {
            // Skip all frames until we have found the first logger frame.
            if (cname.equals(logClassName)) {
                lookingForLogger = false;
            }
        } else {
            if (!cname.equals(logClassName)) {
                // We've found the relevant frame.
                sourceClassName = cname;
                sourceMethodName = frame.getMethodName();
                break;
            }
        }
    }

    if (sourceClassName != null) {
        return sourceClassName + " " + sourceMethodName;
    } else {
        return name;
    }
}
 

import sun.misc.SharedSecrets; //导入方法依赖的package包/类
/**
 * Infer caller's class and method name and set them to the given {@link LogRecord}.
 * Borrowed from {@link LogRecord}.
 */
private void inferCaller(final LogRecord lr) {
  final JavaLangAccess access = SharedSecrets.getJavaLangAccess();
  final Throwable throwable = new Throwable();
  final int depth = access.getStackTraceDepth(throwable);

  boolean lookingForLogger = true;
  for (int ix = 0; ix < depth; ix++) {
    // Calling getStackTraceElement directly prevents the VM
    // from paying the cost of building the entire stack frame.
    final StackTraceElement frame =
        access.getStackTraceElement(throwable, ix);
    final String cname = frame.getClassName();
    final boolean isLoggerImpl = isLoggerImplFrame(cname);
    if (lookingForLogger) {
      // Skip all frames until we have found the first logger frame.
      if (isLoggerImpl) {
        lookingForLogger = false;
      }
    } else {
      if (!isLoggerImpl) {
        // skip reflection call
        if (!cname.startsWith("java.lang.reflect.") && !cname.startsWith("sun.reflect.")) {
          // We've found the relevant frame.
          lr.setSourceClassName(cname);
          lr.setSourceMethodName(frame.getMethodName());
          return;
        }
      }
    }
  }
}
 

import sun.misc.SharedSecrets; //导入方法依赖的package包/类
static String getCallerInfo(String className) {
    String sourceClassName = null;
    String sourceMethodName = null;

    JavaLangAccess access = SharedSecrets.getJavaLangAccess();
    Throwable throwable = new Throwable();
    int depth = access.getStackTraceDepth(throwable);

    boolean lookingForClassName = true;
    for (int ix = 0; ix < depth; ix++) {
        // Calling getStackTraceElement directly prevents the VM
        // from paying the cost of building the entire stack frame.
        StackTraceElement frame = access.getStackTraceElement(throwable, ix);
        String cname = frame.getClassName();
        if (lookingForClassName) {
            // Skip all frames until we have found the first frame having the class name.
            if (cname.equals(className)) {
                lookingForClassName = false;
            }
        } else {
            if (!cname.equals(className)) {
                // We've found the relevant frame.
                sourceClassName = cname;
                sourceMethodName = frame.getMethodName();
                break;
            }
        }
    }

    if (sourceClassName != null) {
        return sourceClassName + " " + sourceMethodName;
    } else {
        return "unknown";
    }
}