Sun Aug 28 11:58:48 GMT 2011

monitoring

Sample code of try-sync

import sun.misc.*;

import java.lang.reflect.*;

public class MonitorUtils {
  private static Unsafe unsafe = getUnsafe();

  public static boolean trySynchronize(Object monitor) {
    return unsafe.tryMonitorEnter(monitor);
  }

  public static void unsynchronize(Object monitor) {
    unsafe.monitorExit(monitor);
  }

  private static Unsafe getUnsafe() {
    try {
      for (Field field : Unsafe.class.getDeclaredFields()) {
        if (Modifier.isStatic(field.getModifiers())) {
          if (field.getType() == Unsafe.class) {
            field.setAccessible(true);
            return (Unsafe) field.get(null);
          }
        }
      }
      throw new IllegalStateException("Unsafe field not found");
    } catch (Exception e) {
      throw new IllegalStateException(
          "Could not initialize unsafe", e);
    }
  }
}

http://www.javaspecialists.eu/archive/Issue194.html


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