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/*
* Copyright (c) 2003, 2017, 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.
*/
/* @test
* @bug 4776783 4778091 4778099
* @summary Check various properties of key and selected-key sets
*
* @run main KeySets
*/
import java.io.*;
import java.nio.channels.*;
import java.util.*;
public class KeySets {
static abstract class Catch {
abstract void go() throws Exception;
Catch(Class xc) throws Exception {
try {
go();
} catch (Exception x) {
if (xc.isInstance(x))
return;
throw new Exception("Wrong exception", x);
}
throw new Exception("Not thrown as expected: " + xc.getName());
}
}
// 4776783: Closing a selector should make key sets inaccessible
static void testClose() throws Exception {
final Selector sel = Selector.open();
sel.keys();
sel.selectedKeys();
sel.close();
new Catch(ClosedSelectorException.class) {
void go() throws Exception {
sel.keys();
}};
new Catch(ClosedSelectorException.class) {
void go() throws Exception {
sel.selectedKeys();
}};
}
static void testNoAddition(final Set s) throws Exception {
new Catch(UnsupportedOperationException.class) {
void go() throws Exception {
s.add(new Object());
}};
new Catch(UnsupportedOperationException.class) {
void go() throws Exception {
ArrayList al = new ArrayList();
al.add(new Object());
s.addAll(al);
}};
}
static interface Adder {
void add() throws IOException;
}
static void testNoRemoval(final Set s, final Adder adder)
throws Exception
{
new Catch(UnsupportedOperationException.class) {
void go() throws Exception {
adder.add();
s.clear();
}};
new Catch(UnsupportedOperationException.class) {
void go() throws Exception {
adder.add();
Iterator i = s.iterator();
i.next();
i.remove();
}};
new Catch(UnsupportedOperationException.class) {
void go() throws Exception {
adder.add();
s.remove(s.iterator().next());
}};
new Catch(UnsupportedOperationException.class) {
void go() throws Exception {
adder.add();
HashSet hs = new HashSet();
hs.addAll(s);
s.removeAll(hs);
}};
new Catch(UnsupportedOperationException.class) {
void go() throws Exception {
adder.add();
s.retainAll(Collections.EMPTY_SET);
}};
}
static SelectionKey reg(Selector sel) throws IOException {
DatagramChannel dc = DatagramChannel.open();
dc.configureBlocking(false);
return dc.register(sel, SelectionKey.OP_WRITE);
}
static void testMutability() throws Exception {
final Selector sel = Selector.open();
// 4778091: Selector.keys() should be immutable
testNoRemoval(sel.keys(), new Adder() {
public void add() throws IOException {
reg(sel);
}
});
testNoAddition(sel.keys());
// 4778099: Selector.selectedKeys() should allow removal but not addition
sel.select();
testNoAddition(sel.selectedKeys());
SelectionKey sk = reg(sel);
sel.select();
int n = sel.selectedKeys().size();
sel.selectedKeys().remove(sk);
if (sel.selectedKeys().size() != n - 1)
throw new Exception("remove failed");
HashSet hs = new HashSet();
hs.add(reg(sel));
sel.select();
sel.selectedKeys().retainAll(hs);
if (sel.selectedKeys().isEmpty())
throw new Exception("retainAll failed");
sel.selectedKeys().removeAll(hs);
if (!sel.selectedKeys().isEmpty())
throw new Exception("removeAll failed");
hs.clear();
hs.add(reg(sel));
sel.select();
sel.selectedKeys().clear();
if (!sel.selectedKeys().isEmpty())
throw new Exception("clear failed");
}
public static void main(String[] args) throws Exception {
testClose();
testMutability();
}
}
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