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/*
* Copyright (c) 2021, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package impl;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.net.spi.InetAddressResolver;
import java.net.spi.InetAddressResolverProvider;
import java.util.stream.Stream;
public class WithBootstrapResolverUsageProvider extends InetAddressResolverProvider {
public static volatile long numberOfGetCalls;
@Override
public InetAddressResolver get(Configuration configuration) {
numberOfGetCalls++;
System.out.println("The following provider will be used by current test:" +
this.getClass().getCanonicalName());
System.out.println("InetAddressResolverProvider::get() called " + numberOfGetCalls + " times");
// We use different names to avoid InetAddress-level caching
doLookup("foo" + numberOfGetCalls + ".A.org");
// We need second call to test how InetAddress internals maintain reference to a bootstrap resolver
doLookup("foo" + numberOfGetCalls + ".B.org");
return new InetAddressResolver() {
@Override
public Stream<InetAddress> lookupByName(String host, LookupPolicy lookupPolicy)
throws UnknownHostException {
return Stream.of(InetAddress.getByAddress(host, new byte[]{127, 0, 2, 1}));
}
@Override
public String lookupByAddress(byte[] addr) throws UnknownHostException {
return configuration.builtinResolver().lookupByAddress(addr);
}
};
}
// Perform an InetAddress resolution lookup operation
private static void doLookup(String hostName) {
try {
InetAddress.getByName(hostName);
} catch (UnknownHostException e) {
// Ignore UHE since the bootstrap resolver is used here
}
}
@Override
public String name() {
return "WithBootstrapResolverUsageProvider";
}
}
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