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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");

    }

}