Quelle CloseAvailable.java Sprache: JAVA

/*
* Copyright (c) 1998, 2019, 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 4091859 8189366
* @library /test/lib
* @summary Test Socket.available()
* @run main CloseAvailable
* @run main/othervm -Djava.net.preferIPv4Stack=true CloseAvailable
*/

import java.net.*;
import java.io.*;
import jdk.test.lib.net.IPSupport;

public class CloseAvailable {

    public static void main(String[] args) throws Exception {
        IPSupport.throwSkippedExceptionIfNonOperational();

        testClose();

        testEOF(true);
        testEOF(false);
        testIOEOnClosed(true);
        testIOEOnClosed(false);
    }

    static void testClose() throws IOException {
        boolean error = true;
        InetAddress addr = InetAddress.getLocalHost();
        ServerSocket ss = new ServerSocket(0, 0, addr);
        int port = ss.getLocalPort();

        Thread t = new Thread(new Thread("Close-Available-1") {
            public void run() {
                try {
                    Socket s = new Socket(addr, port);
                    s.close();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });

        t.start();

        Socket  soc = ss.accept();
        ss.close();

        DataInputStream is = new DataInputStream(soc.getInputStream());
        is.close();

        try {
            is.available();
        }
        catch (IOException ex) {
            error = false;
        }
        if (error)
            throw new RuntimeException("Available() can be called after stream closed.");
    }

    // Verifies consistency of `available` behaviour when EOF reached, both
    // explicitly and implicitly.
    static void testEOF(boolean readUntilEOF) throws IOException {
        System.out.println("testEOF, readUntilEOF: " + readUntilEOF);
        InetAddress addr = InetAddress.getLoopbackAddress();
        ServerSocket ss = new ServerSocket();
        ss.bind(new InetSocketAddress(addr, 0), 0);
        int port = ss.getLocalPort();

        try (Socket s = new Socket(addr, port)) {
            s.getOutputStream().write(0x42);
            s.shutdownOutput();

            try (Socket soc = ss.accept()) {
                ss.close();

                InputStream is = soc.getInputStream();
                int b = is.read();
                assert b == 0x42;
                assert !s.isClosed();
                if (readUntilEOF) {
                    b = is.read();
                    assert b == -1;
                }

                int a;
                for (int i = 0; i < 100; i++) {
                    a = is.available();
                    System.out.print(a + ", ");
                    if (a != 0)
                        throw new RuntimeException("Unexpected non-zero available: " + a);
                }
                assert !s.isClosed();
                assert is.read() == -1;
            }
        }
        System.out.println("\ncomplete");
    }

    // Verifies IOException thrown by `available`, on a closed input stream
    // that may, or may not, have reached EOF prior to closure.
    static void testIOEOnClosed(boolean readUntilEOF) throws IOException {
        System.out.println("testIOEOnClosed, readUntilEOF: " + readUntilEOF);
        InetAddress addr = InetAddress.getLoopbackAddress();
        ServerSocket ss = new ServerSocket();
        ss.bind(new InetSocketAddress(addr, 0), 0);
        int port = ss.getLocalPort();

        try (Socket s = new Socket(addr, port)) {
            s.getOutputStream().write(0x43);
            s.shutdownOutput();

            try (Socket soc = ss.accept()) {
                ss.close();

                InputStream is = soc.getInputStream();
                int b = is.read();
                assert b == 0x43;
                assert !s.isClosed();
                if (readUntilEOF) {
                    b = is.read();
                    assert b == -1;
                }
                is.close();
                try {
                    b = is.available();
                    throw new RuntimeException("UNEXPECTED successful read: " + b);
                } catch (IOException expected) {
                    System.out.println("caught expected IOException:" + expected);
                }
            }
        }
        System.out.println("\ncomplete");
    }
}

quality86%

¤ Dauer der Verarbeitung: 0.1 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.