resources.report.rules.pmd.DoubleCheckedLocking.html Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of sanity4j Show documentation

Sanity4J was created to simplify running multiple static code analysis tools on the Java projects. It provides a single entry point to run all the selected tools and produce a consolidated report, which presents all findings in an easily accessible manner.

There is a newer version: 1.1.1

Show newest version



DoubleCheckedLocking


DoubleCheckedLocking
Partially created objects can be returned by the Double Checked Locking pattern when used in Java.
An optimizing JRE may assign a reference to the baz variable before it creates the object the
  reference is intended to point to.  For more details see http://www.javaworld.com/javaworld/jw-02-2001/jw-0209-double.html.
      
		
		
		    
		    
    		    
    		    
    		    

    		    This rule is defined by the following Java class:
    		    net.sourceforge.pmd.rules.DoubleCheckedLocking
    		    
		    
	    
	    
        
        
        Example:
            
                    
  
public class Foo {
  Object baz;
  Object bar() {
    if(baz == null) { //baz may be non-null yet not fully created
      synchronized(this){
        if(baz == null){
          baz = new Object();
        }
      }
    }
    return baz;
  }
}