org.dellroad.stuff.servlet
Class BigFatLock

java.lang.Object
  org.springframework.web.filter.GenericFilterBean
      org.springframework.web.filter.OncePerRequestFilter
          org.dellroad.stuff.servlet.BigFatLock

All Implemented Interfaces:

Filter, BeanNameAware, DisposableBean, InitializingBean, ServletContextAware

public final class BigFatLock
extends OncePerRequestFilter

Class for serializing processing using a big fat lock.

The lock can be acquired using runWithLock(java.lang.Runnable). This class can also be used as a servlet filter.

Trace-level logging for displaying lock acquire and release events is included.

Field Summary

Fields inherited from class org.springframework.web.filter.OncePerRequestFilter

ALREADY_FILTERED_SUFFIX

Fields inherited from class org.springframework.web.filter.GenericFilterBean

logger

Constructor Summary

BigFatLock()

Method Summary

protected void	doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain)
static boolean	isLockHeld() Verify that the current thread is holding the big fat lock.
static <V> V	runWithLock(Callable<V> action) Invoke the given action after acquiring the big fat lock.
static void	runWithLock(Runnable action) Invoke the given action after acquiring the big fat lock.
String	toString()

Methods inherited from class org.springframework.web.filter.OncePerRequestFilter

doFilter, getAlreadyFilteredAttributeName, shouldNotFilter

Methods inherited from class org.springframework.web.filter.GenericFilterBean

addRequiredProperty, afterPropertiesSet, destroy, getFilterConfig, getFilterName, getServletContext, init, initBeanWrapper, initFilterBean, setBeanName, setServletContext

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

BigFatLock

public BigFatLock()

Method Detail

doFilterInternal

protected void doFilterInternal(HttpServletRequest request,
                                HttpServletResponse response,
                                FilterChain filterChain)
                         throws ServletException,
                                IOException

Specified by:

doFilterInternal in class OncePerRequestFilter

Throws:

ServletException

IOException

runWithLock

public static void runWithLock(Runnable action)

Invoke the given action after acquiring the big fat lock.

runWithLock

public static <V> V runWithLock(Callable<V> action)
                     throws Exception

Invoke the given action after acquiring the big fat lock.

Throws:

Exception

isLockHeld

public static boolean isLockHeld()

Verify that the current thread is holding the big fat lock.

toString

public String toString()

Overrides:

toString in class Object