Java example source code file (ConnectState.java)
The ConnectState.java Java example source code/*
* Copyright (c) 2001, 2012, 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
* @summary Test socket-channel connection-state transitions
* @library ..
*/
import java.io.*;
import java.net.*;
import java.nio.*;
import java.nio.channels.*;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
public class ConnectState {
static PrintStream log = System.err;
static InetSocketAddress remote;
final static int ST_UNCONNECTED = 0;
final static int ST_PENDING = 1;
final static int ST_CONNECTED = 2;
final static int ST_CLOSED = 3;
final static int ST_PENDING_OR_CONNECTED = 4;
// NO exceptions expected
final static Collection<Class NONE = Collections.emptySet();
// make a set of expected exception.
static Collection<Class expectedExceptions(Class... expected) {
final Collection<Class exceptions;
if (expected.length == 0) {
exceptions = NONE;
} else if (expected.length == 1) {
assert expected[0] != null;
exceptions = Collections.<Classsingleton(expected[0]);
} else {
exceptions = new HashSet<>(Arrays.asList(expected));
}
return exceptions;
}
static abstract class Test {
abstract String go(SocketChannel sc) throws Exception;
static void check(boolean test, String desc) throws Exception {
if (!test)
throw new Exception("Incorrect state: " + desc);
}
static void check(SocketChannel sc, int state) throws Exception {
switch (state) {
case ST_UNCONNECTED:
check(!sc.isConnected(), "!isConnected");
check(!sc.isConnectionPending(), "!isConnectionPending");
check(sc.isOpen(), "isOpen");
break;
case ST_PENDING:
check(!sc.isConnected(), "!isConnected");
check(sc.isConnectionPending(), "isConnectionPending");
check(sc.isOpen(), "isOpen");
break;
case ST_CONNECTED:
check(sc.isConnected(), "isConnected");
check(!sc.isConnectionPending(), "!isConnectionPending");
check(sc.isOpen(), "isOpen");
break;
case ST_CLOSED:
check(sc.isConnected(), "isConnected");
check(!sc.isConnectionPending(), "!isConnectionPending");
check(sc.isOpen(), "isOpen");
break;
case ST_PENDING_OR_CONNECTED:
check(sc.isConnected() || sc.isConnectionPending(),
"isConnected || isConnectionPending");
check(sc.isOpen(), "isOpen");
break;
}
}
Test(String name, Class<?> exception, int state) throws Exception {
this(name, expectedExceptions(exception), state);
}
// On some architecture we may need to accept several exceptions.
// For instance on Solaris, when using a server colocated on the
// machine we cannot guarantee that we will get a
// ConnectionPendingException when connecting twice on the same
// non-blocking socket. We may instead get a an
// AlreadyConnectedException, which is also valid: it simply means
// that the first connection has been immediately accepted.
Test(String name, Collection<Class exceptions, int state)
throws Exception {
SocketChannel sc = SocketChannel.open();
String note;
try {
try {
note = go(sc);
} catch (Exception x) {
Class<?> expectedExceptionClass = null;
for (Class<?> exception : exceptions) {
if (exception.isInstance(x)) {
log.println(name + ": As expected: "
+ x);
expectedExceptionClass = exception;
check(sc, state);
break;
}
}
if (expectedExceptionClass == null
&& !exceptions.isEmpty()) {
// we had an exception, but it's not of the set of
// exceptions we expected.
throw new Exception(name
+ ": Incorrect exception",
x);
} else if (exceptions.isEmpty()) {
// we didn't expect any exception
throw new Exception(name
+ ": Unexpected exception",
x);
}
// if we reach here, we have our expected exception
assert expectedExceptionClass != null;
return;
}
if (!exceptions.isEmpty()) {
throw new Exception(name
+ ": Expected exception not thrown: "
+ exceptions.iterator().next());
}
check(sc, state);
log.println(name + ": Returned normally"
+ ((note != null) ? ": " + note : ""));
} finally {
if (sc.isOpen())
sc.close();
}
}
}
static void tests() throws Exception {
log.println(remote);
new Test("Read unconnected", NotYetConnectedException.class,
ST_UNCONNECTED) {
@Override
String go(SocketChannel sc) throws Exception {
ByteBuffer b = ByteBuffer.allocateDirect(1024);
sc.read(b);
return null;
}};
new Test("Write unconnected", NotYetConnectedException.class,
ST_UNCONNECTED) {
@Override
String go(SocketChannel sc) throws Exception {
ByteBuffer b = ByteBuffer.allocateDirect(1024);
sc.write(b);
return null;
}};
new Test("Simple connect", NONE, ST_CONNECTED) {
@Override
String go(SocketChannel sc) throws Exception {
sc.connect(remote);
return null;
}};
new Test("Simple connect & finish", NONE, ST_CONNECTED) {
@Override
String go(SocketChannel sc) throws Exception {
sc.connect(remote);
if (!sc.finishConnect())
throw new Exception("finishConnect returned false");
return null;
}};
new Test("Double connect",
AlreadyConnectedException.class, ST_CONNECTED) {
@Override
String go(SocketChannel sc) throws Exception {
sc.connect(remote);
sc.connect(remote);
return null;
}};
new Test("Finish w/o start",
NoConnectionPendingException.class, ST_UNCONNECTED) {
@Override
String go(SocketChannel sc) throws Exception {
sc.finishConnect();
return null;
}};
// Note: using our local EchoServer rather than echo on a distant
// host - we see that Tries to finish = 0 (instead of ~ 18).
new Test("NB simple connect", NONE, ST_CONNECTED) {
@Override
String go(SocketChannel sc) throws Exception {
sc.configureBlocking(false);
sc.connect(remote);
int n = 0;
while (!sc.finishConnect()) {
Thread.sleep(10);
n++;
}
sc.finishConnect(); // Check redundant invocation
return ("Tries to finish = " + n);
}};
// Note: using our local EchoServer rather than echo on a distant
// host - we cannot guarantee that this test will get a
// a ConnectionPendingException: it may get an
// AlreadyConnectedException, so we should allow for both.
new Test("NB double connect",
expectedExceptions(ConnectionPendingException.class,
AlreadyConnectedException.class),
ST_PENDING_OR_CONNECTED) {
@Override
String go(SocketChannel sc) throws Exception {
sc.configureBlocking(false);
sc.connect(remote);
sc.connect(remote);
return null;
}};
new Test("NB finish w/o start",
NoConnectionPendingException.class, ST_UNCONNECTED) {
@Override
String go(SocketChannel sc) throws Exception {
sc.configureBlocking(false);
sc.finishConnect();
return null;
}};
new Test("NB connect, B finish", NONE, ST_CONNECTED) {
@Override
String go(SocketChannel sc) throws Exception {
sc.configureBlocking(false);
sc.connect(remote);
sc.configureBlocking(true);
sc.finishConnect();
return null;
}};
}
public static void main(String[] args) throws Exception {
try (TestServers.EchoServer echoServer
= TestServers.EchoServer.startNewServer(500)) {
remote = new InetSocketAddress(echoServer.getAddress(),
echoServer.getPort());
tests();
}
}
}
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