Significance of wakeUpIntervalSeconds ?

[srivathsak]

Hi ppl,
Thanks 4 the support u r giving....
Here i have another doubt....I am not clear with the concept of wakeUpIntervalSeconds.....
Can anyone explain me in detail what is the significance of it in evicting a node......

[ben.wang]

That's the eviction thread wake up interval to process eviction.

[srivathsak]

Do you mean to say if in this period the node is not accessed it will be evicted.
In the test cases dealing with wakeUpIntervalSeconds you have used a method called _sleep(period ) where the period depends on wakeUpIntervalSeconds. How is this going to affect the performance of the test case.

[srivathsak]

Here in the Code pasted below what I have seen is that the value of the node /aop/3 is null if it is not processed in the last 9.950sec. The value given for the wakeUpIntervalSecond is 5 sec and for the timeToLiveSeconds for region /aop is 4 sec.
When I access the node /aop/3/1 even after 13 sec without processig in the mean time i am able to access it.Is this because I am refreshing the node /aop/3.
But when iam trying to retrieve the value of /aop/3 after refreshing /aop/3/1 i am getting null value.
Could u explain all of this number game of eviction.....


public void testUpdateEviction() {
String rootStr = "/aop/";
AOPInstance aop = new AOPInstance();
try {
for(int i=0; i < 4; i++) {
String stri = rootStr +i;
Fqn fqni = Fqn.fromString(stri);
cache_.put(fqni, stri, stri);
cache_.put(fqni, AOPInstance.KEY, aop); // signals that this is an aop node.
cache_.put(fqni, InternalDelegate.CLASS_INTERNAL, String.class); // signals that this is an aop node.
for(int j=0; j < 2; j++) {
String strj = stri +"/" +j;
Fqn fqnj = Fqn.fromString(strj);
cache_.put(fqnj, strj, strj);
}
}
} catch (Exception e) {
e.printStackTrace();
fail("Failed to insert data" +e);
}

int period = (wakeupIntervalMillis_ +1000);
log("period is " +period);
// _sleep(period); // it really depends on the eviction thread time.
String str = rootStr + "3";
Fqn fqn = Fqn.fromString(str);
System.out.println(cache_.toString(true));
try {
String val = (String)cache_.get(fqn, str); // just to keep it fresh
System.out.println("val is :"+val);

//_sleep(period); // it really depends the eviction thread time.
val = (String)cache_.get(fqn, str); // just to keep it fresh
System.out.println("val is :"+val);

//_sleep(period); // it really depends the eviction thread time.
val = (String)cache_.get(rootStr +"3/1", rootStr+"3/1");
System.out.println("val is :"+val);
assertNotNull("Node should not be empty ", val);
//_sleep(wakeupIntervalMillis_ +2000);
_sleep(period + 2000);
val = (String)cache_.get(rootStr +"3", rootStr+"3");
System.out.println("val is :"+val);
assertNotNull("Node should be empty. But this is broken because of TreeCache._removeData() has disabled " +
"sendNodeEvent. See the FIXME. ", val);
} catch (Exception e) {
e.printStackTrace();
}
}