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/* @test
* @bug 4292867
* @summary Check that InetAddress doesn't continue to throw UHE
* after the name service has recovered and the negative ttl
* on the initial lookup has expired.
* @compile -XDignore.symbol.file=true SimpleNameService.java
* SimpleNameServiceDescriptor.java
* @run main/othervm/timeout=200 -Dsun.net.spi.nameservice.provider.1=simple,sun CacheTest
*/
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.security.Security;
public class CacheTest {
public static void main(String args[]) throws Exception {
/*
* First check the ttl on negative lookups is in the <15 second
* range. If the ttl is <=0 it means we cache forever or always
* consult the name service. For ttl > 15 the test would take
* too long so we skip it (need to coordinate jtreg timeout
* with negative ttl)
*/
String ttlProp = "networkaddress.cache.negative.ttl";
int ttl = 0;
String policy = Security.getProperty(ttlProp);
if (policy != null) {
ttl = Integer.parseInt(policy);
}
if (ttl <= 0 || ttl > 15) {
System.err.println("Security property " + ttlProp + " needs to " +
" in 1-15 second range to execute this test");
return;
}
/*
* The following outlines how the test works :-
*
* 1. Do a lookup via InetAddress.getByName that it guaranteed
* to succeed. This forces at least one entry into the cache
* that will not expire.
*
* 2. Do a lookup via InetAddress.getByName that is guarnateed
* to fail. This results in a negative lookup cached for
* for a short period to time.
*
* 3. Wait for the cache entry to expire.
*
* 4. Do a lookup (which should consult the name service) and
* the lookup should succeed.
*/
// name service needs to resolve this.
SimpleNameService.put("theclub", "129.156.220.219");
// this lookup will succeed
InetAddress.getByName("theclub");
// lookup "luster" - this should throw UHE as name service
// doesn't know anything about this host.
try {
InetAddress.getByName("luster");
throw new RuntimeException("Test internal error " +
" - luster is bring resolved by name service");
} catch (UnknownHostException x) {
}
// name service now needs to know about luster
SimpleNameService.put("luster", "10.5.18.21");
// wait for the cache entry to expire and lookup should
// succeed.
Thread.currentThread().sleep(ttl*1000 + 1000);
InetAddress.getByName("luster");
}
}