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Java Source Code / Java Documentation » J2EE » spring framework 2.5 » org.springframework.util

Source Cross Reference Class Diagram Java Document (Java Doc)

java.lang .Object

org.springframework.util .ConcurrencyThrottleSupport

All known Subclasses:   org.springframework.aop.interceptor .ConcurrencyThrottleInterceptor,
ConcurrencyThrottleSupport
abstract public class ConcurrencyThrottleSupport implements Serializable(Code)
Support class for throttling concurrent access to a specific resource.
Designed for use as a base class, with the subclass invoking the ConcurrencyThrottleSupport.beforeAccess() and ConcurrencyThrottleSupport.afterAccess() methods at appropriate points of its workflow. Note that afterAccess should usually be called in a finally block!
The default concurrency limit of this support class is -1 ("unbounded concurrency"). Subclasses may override this default; check the javadoc of the concrete class that you're using.
author:
   Juergen Hoeller
since:
   1.2.5
See Also:   ConcurrencyThrottleSupport.setConcurrencyLimit
See Also:   ConcurrencyThrottleSupport.beforeAccess()
See Also:   ConcurrencyThrottleSupport.afterAccess()
See Also:   org.springframework.aop.interceptor.ConcurrencyThrottleInterceptor
See Also:   java.io.Serializable

Field Summary
final public static int NO_CONCURRENCY
     Switch concurrency 'off': that is, don't allow any concurrent invocations.
final public static int UNBOUNDED_CONCURRENCY
     Permit any number of concurrent invocations: that is, don't throttle concurrency.
protected transient Log logger


Method Summary
protected void afterAccess()
     To be invoked after the main execution logic of concrete subclasses.
protected void beforeAccess()
     To be invoked before the main execution logic of concrete subclasses.
public int getConcurrencyLimit()
     Return the maximum number of concurrent access attempts allowed.
public boolean isThrottleActive()
     Return whether this throttle is currently active.
public void setConcurrencyLimit(int concurrencyLimit)
     Set the maximum number of concurrent access attempts allowed.

Field Detail
NO_CONCURRENCY
final public static int NO_CONCURRENCY(Code)
Switch concurrency 'off': that is, don't allow any concurrent invocations.

UNBOUNDED_CONCURRENCY
final public static int UNBOUNDED_CONCURRENCY(Code)
Permit any number of concurrent invocations: that is, don't throttle concurrency.

logger
protected transient Log logger(Code)
Transient to optimize serialization

Method Detail
afterAccess
protected void afterAccess()(Code)
To be invoked after the main execution logic of concrete subclasses.
See Also:   ConcurrencyThrottleSupport.beforeAccess()

beforeAccess
protected void beforeAccess()(Code)
To be invoked before the main execution logic of concrete subclasses.
This implementation applies the concurrency throttle.
See Also:   ConcurrencyThrottleSupport.afterAccess()
See Also:

getConcurrencyLimit
public int getConcurrencyLimit()(Code)
Return the maximum number of concurrent access attempts allowed.

isThrottleActive
public boolean isThrottleActive()(Code)
Return whether this throttle is currently active. true if the concurrency limit for this instance is active
See Also:   ConcurrencyThrottleSupport.getConcurrencyLimit()

setConcurrencyLimit
public void setConcurrencyLimit(int concurrencyLimit)(Code)
Set the maximum number of concurrent access attempts allowed. -1 indicates unbounded concurrency.
In principle, this limit can be changed at runtime, although it is generally designed as a config time setting.
NOTE: Do not switch between -1 and any concrete limit at runtime, as this will lead to inconsistent concurrency counts: A limit of -1 effectively turns off concurrency counting completely.

Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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