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java.lang.Object | +--java.lang.Thread | +--org.apache.tapestry.util.JanitorThread
A basic kind of janitor, an object that periodically invokes ICleanable.executeCleanup()
on a set of objects.
The JanitorThread holds a weak reference to the objects it operates on.
Field Summary | |
static long |
DEFAULT_INTERVAL_MILLIS
Default number of seconds between janitor runs, about 30 seconds. |
Fields inherited from class java.lang.Thread |
MAX_PRIORITY, MIN_PRIORITY, NORM_PRIORITY |
Constructor Summary | |
JanitorThread()
Creates a new daemon Janitor. |
|
JanitorThread(String name)
Creates new Janitor with the given name. |
Method Summary | |
void |
add(ICleanable cleanable)
Adds a new cleanable object to the list of references. |
long |
getInterval()
|
static JanitorThread |
getSharedJanitorThread()
Returns a shared instance of JanitorThread. |
void |
run()
Alternates between waitForNextPass() and sweep() . |
void |
setInterval(long value)
Updates the property, which may not take effect until the next time the thread finishes sleeping. |
protected void |
sweep()
Runs through the list of targets and invokes ICleanable.executeCleanup() on each of
them. |
String |
toString()
|
protected boolean |
waitForNextPass()
Waits for the next run, by sleeping for the desired period. |
Methods inherited from class java.lang.Thread |
activeCount, checkAccess, countStackFrames, currentThread, destroy, dumpStack, enumerate, getContextClassLoader, getName, getPriority, getThreadGroup, holdsLock, interrupt, interrupted, isAlive, isDaemon, isInterrupted, join, join, join, resume, setContextClassLoader, setDaemon, setName, setPriority, sleep, sleep, start, stop, stop, suspend, yield |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Field Detail |
public static final long DEFAULT_INTERVAL_MILLIS
Constructor Detail |
public JanitorThread()
public JanitorThread(String name)
Method Detail |
public static JanitorThread getSharedJanitorThread()
public long getInterval()
public void setInterval(long value)
value
- the interval, in milliseconds, between sweeps.
IllegalStateException
- always, if the receiver is the shared JanitorThread
IllegalArgumentException
- if value is less than 1public void add(ICleanable cleanable)
protected void sweep()
ICleanable.executeCleanup()
on each of
them. WeakReference
s that have been invalidated are weeded out.
protected boolean waitForNextPass()
public void run()
waitForNextPass()
and sweep()
.
run
in interface Runnable
run
in class Thread
public String toString()
toString
in class Thread
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